DH Operation and Installation Manual
Transcription
DH Operation and Installation Manual
Concepts and Designs Inc. DH Series - SSCR Rotor Installation, Operation and Maintenance Manual Desiccant Dehumidifier Series Installation, Operation And Maintenance Manual PO Box 288 / Owatonna MN 55060 Phone: (507) 451-2198 / Fax: (507) 451-1177 EMail: [email protected] Web Site:www.cdihvac.com After Hour Technical Support: (507) 451-2198 1 January 29 2010 Rev8 SGA Concepts and Designs Inc. 2 C o n c e p t s a n d D e s i g n s I n c. DH Series - SSCR Rotor Installation, Operation and Maintenance Manual Hazards WARNING Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury or death. Read the installation, operating and maintenance instructions thoroughly before installing or servicing this equipment. FOR YOUR SAFETY The use and storage of gasoline or other flammable vapors and liquids in open containers in the vicinity of this appliance is hazardous. FOR YOUR SAFETY If you smell gas: 1. Open Windows 2. Don’t touch electrical switches 3. Extinguish any open flames 4. Immediately call your gas supplier 3 Concepts and Designs Inc. This manual shall be placed in a specific location and maintained in legible condition, with directions on unit as to the location where the manual is to be stored. Owners Name:__________________________________________ Address:____________________________________________ Street______________________________________________ City ___________________________________ State ___________________ Zip code _______________ Country __________________ Telephone # : (______)_______________________________ Fax # : (_______)____________________________ Unit Model #________________________________________ Unit Serial # _______________________ 4 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual The Installing Contractor Must Identify all of the emergency shut-off devices. All wiring will be done in accordance with the National Electrical Code. A manual shut-off shall be installed on the outside of the unit’s gas vestibule to be used as the main shut-off of the unit’s gas supply, when local codes require the installation of such a valve. A minimum 1/8 inch NPT plugged tapping, accessible for test gauge connection, must be installed immediately upstream of the gas supply connection to the unit. In Case of Emergency: 1. Close main manual gas supply valve. 2. Shut off main disconnect. When shutting down unit for extended periods of time we recommend that the following be done: 1. Shut off main disconnect. 2. Close main manual gas supply valve to prevent the leaking of gas into the combustion chamber. 3. Cover reactivation air outlet. When restarting the unit after long periods of shut down the following should be done: 1. Check the unit for general cleanliness; any debris small or large has been removed and the unit is clean. 2. Make sure all wire terminals and connections been checked for tightness. 3. Check the supply air outlet, and the blower inlets have been checked and are free from any obstructions. 4. Remove cover from reactivation air outlet. 5. Check blowers to make sure the shaft rotates freely, sheaves are aligned, sheaves, blowers, and motor bolts or set screws checked for tightness. 6. Make sure all damper linkages are free to move, no binding will occur. 7. Open main manual gas supply valve and check for leaks. 8. Turn on main disconnect. 5 Concepts and Designs Inc. Table of Contents Hazards.....................................................3 18. Heating Applications......................... 21 Contractor Information............................4-5 19. Electrical Parts and Options.......21-23 Generic Unit Drawing................................ 8 Carel Controller Information Installation 1.0 Locating The Unit ............................. 9 Start Up 2.0 Clearance...........................................9 20. Special Tools Required..................... 30 3.0 Curbs................................................10 21. P recautions Before Attempting Startup Of The Desiccant DH..................30-31 4.0 Handling The Equipment.................. 11 peration of the basic pCO3 O Carel Controller...........................24-29 22. Start Up.......................................31-33 5.0 Preparing Unit For Installation.......... 12 MR212 Modulation Adjustment..33-34 6.0 Assembling The Unit........................ 12 M611 Modulation Adjustment.......... 34 7.0 Check For Tightness........................ 12 23. Typical Sequence Of Operation..34-40 8.0 Location Of Accessories................... 12 Reactivation Rate Control (RCC).... 35 9.0 Electrical Connections...................... 13 Reactivation Rate Control with Face & Bypass..........................................36 10. Gas Piping . ..................................... 13 11. Coil Piping...................................13-17 Heating Cooling And Face & Bypass Control (HCFB)................................. 37 12. Coil Maintenance............................. 17 Make Up Air Control (MDH).............. 38 13. Condensate Drain.......................17-18 Make Up Air Control (MDH-CTR)..... 39 14. Duct Connections............................. 19 24. S hutting Down Unit For Extended Periods Of Time............................... 40 Control Overview 15. Make-Up Air Applications................. 19 25. 26. 16. Return Air Applications................19-20 17. Unit Shut Down Results From:......... 20 6 estarting Unit After Extended Shut R Down................................................40 hutting Down The Burner In An S Emergency....................................... 40 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual Table of Contents Cont. Rotor and Cassette Technical Infor- 42. Safety mation Handling SGA Rotor And Cassettes.........................................55 27. General Rotor Do’s And Don’ts........ 42 Maintenance Schedule 28. C haracteristics of Silica Gel Desiccant Media...............................................43 43. Maintenance Schedule................56-58 29. C haracteristics of SSCR Desiccant Media...............................................44 44. Door Gasket Replacement..........59-60 30. C hemical Compounds That May Dam-. age SSCR Silica Gel Honeycomb Rotor................................................44 Warranty and Parts Information 31. Principle Of Operation...................... 45 General Warranty............................. 61 32. DH Rotors & Cassettes Warranty Claims............................... 62 Replacement Parts........................... 62 Specifications..............................45-46 33. Operation Troubleshooting Section Rotor Section................................... 63 Drive System Operation................... 47 eneral Unit Shut Down G Problems.....................................64-65 Reactivation Section...................66-71 Process - Supply Section............72-73 Fault Lights..................................74-79 Measurement Of Performance......... 47 Maintenance Of The Rotor 34. Rotor Cleaning................................. 48 35. R otor Core Samples......................... 49 36. Desiccant Rotor Repair.................... 50 Maintenance Log & Notes 37. Rotor Removal & Replacement...51-52 38. Seal Replacement............................ 52 39. Drive System Parts Replacement.... 52 40. Rotor Alignment Inspection.........52-54 41. Limited Rotor Warranty...............54-55 7 Maintenance Log.........................80-81 Notes...........................................82-83 Concepts and Designs Inc. Unit above showing top view with some available options installed Unit below is a side view of a unit with some available options installed 8 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual Installation are to be supported around the perimeter and The following recommendations are not across any shipping split. Be sure to verify that intended to supplant any requirements of support structure dimensions coincide with the federal, state, or local codes having juris- unit dimensions. diction. Be sure to locate the unit so that any unit air This equipment shall be installed and wired in intakes are remote from any building exhaust accordance with regulations of the National fan outlets, gasoline storage facilities, or any Boards of Fire Underwriters, National Electric other contaminants that could potentially Code, and any other local governing bodies. cause dangerous situations. The use and In Canada, equipment should be installed storage of gasoline or other flammable vapors in accordance with the applicable provincial and liquids in the vicinity of this unit is very regulations. Furthermore, this document does hazardous. not exempt the installer, designer, or user of this equipment from its correct application, On the direct fired gas reactivation DH series nor from the safe and correct operation of this dehumidifier the gas is burning directly into the unit(s) and any required ancillary systems; reactivation air stream being heated, thereincluding but not limited to, precooling, pre- fore anything passing across the burner may heating, steam, post cooling and post-heating be combusted. If this type DH series unit is equipment, duct distribution, vapor barriers, used in a hazardous environment, insure that contaminants cannot enter the unit intake(s). controls, etc. 1.0 LOCATING THE UNIT 2.0 CLEARANCE Prior to locating the unit, authorities that have jurisdiction should be consulted before installations are made. For horizontally vented units the distances from adjacent public walkways, adjacent buildings, windows that can be opened, and building openings, shall conform with the local codes. Except where required for service access or venting, DH series units may be installed on top of combustibles with 0” of clearance. A minimum of 6” clearance on other sides and top is to be provided. The Concepts and Designs Inc. DH unit must be installed LEVEL and located so that there is enough clearance for opening the access doors or service clearances (See unit drawing for clearances). In addition to allowing room for access door swing and service clearances, NEC or other governing agencies may require a minimum 42” or more of clearance in front of the electrical panel or vestibule. Refer to the submittal documents for proper air flow direction through the unit so that it may be positioned to accommodate necessary ductwork. Also note from the submittal where approximate electrical and gas hookup points are located so that the proper connections can be made. Remember to verify position and ability of support beams, pad, or curb to properly support the unit. At a minimum all DH units When located on a roof, the unit intakes need to be a minimum of 14” above the roof to prevent the intake of snow or splashed rain. The unit should be located if at all possible so that the prevailing winds do not blow into the unit inlet. The optional fresh air inlet hood (if supplied) is not designed for extreme weather conditions. If the application is critical, other provisions must be made to protect the unit inlet from driving winds. 9 Concepts and Designs Inc. 3.0 CURBS Under structure beam spacing should also be checked to preclude any interference with air ducts. When units are installed on rooftop curbs, there must be a gasket between the top of the curb and the base surface of the unit to prevent moisture from leaking into the building from either driving rains or melting snow. When Concepts and Designs provides curbs, gasketing will also be provided and shipped with the unit. Curb Dimensions A=Length of unit minus 1 1/2” B=Width of unit minus 1 1/2” B UNDER STRUCTURE BEAM A WOOD NAILER 5/8" TYP CLEARANCE UNIT BASE BEAD OF CAULK WOOD NAILER BY CDI WEATHERSTRIPING INSULATION AND CANT BY OTHERS 10 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual 4.0 HANDLING THE EQUIPMENT The CDI unit is designed for handling by two methods. In both cases it is lifted from the bottom base in a fashion that holds it level and keeps it from tipping, falling or twisting. If the unit is severely twisted during handling, permanent damage may occur. The unit is not to be lifted from the top unless the optional top lifting or suspension package has been provided. It is the installer’s responsibility to verify the handling equipment’s ability to safely handle the equipment. The preferred method of handling is from the unit’s channel base frame where special lifting lug brackets are installed on the unit, see the Figure to the bottom right of this page for an example of units with only four lifting lugs; see the Figure to the top left of this page for an example of units with six lifting lugs and see the Figure at the bottom left of this page for an example of units with eight lifting lugs. All lifting operations must be accomplished with a load spreader of sufficient width to insure that the lifting cables clear the side of the unit to prevent any damage to the unit. If this type of spreader is not available, wood strips should be inserted between the cables and unit where necessary. The alternative method of lifting would be by forklift (but not recommended unless necessary), provided that the forks extend completely underneath the unit and reach the unit base frame on the opposite side. Forks which do not reach to the other side of the unit could cause it to tip resulting in unsafe conditions or damage to the unit. All lifting points must be used and will be marked “LIFT HERE” on the unit. 11 Concepts and Designs Inc. 5.0 PREPARING UNIT FOR INSTAL- 7.0 CHECK FOR TIGHTNESS LATION During transit, unloading, and setting of the When inspecting the unit before installation be unit, some of the bolts, nuts and screws may sure to look for any shipping brackets or other have become loosened. Particularly in pillow packaging that should be removed prior to block ball bearing assemblies on blower secassembling the unit. It is the installers respon- tions. It is required that all bolts, nuts and set sibility to remove any protective coverings and screws be checked and tightened as required. shipping supports. All such items should be Be sure to turn all blower fan shafts by hand to make certain that no interference or rubbing removed prior to unit startup. occurs. Also, insure that bearing lock rings and or set screws are tight. 6.0 ASSEMBLING THE UNIT All sections or parts that are not shipped attached to the basic unit must be installed at the job site, using the assembly hardware provided with the unit. The determination of the general arrangement of the assembly can be made by referencing the unit-specific drawings. For the location of the mounting hardware, caulk, foam tape, etc. see the packing list (the packing list sheet is usually located attached to the door with the following tag attached on the out side in the upper corner). Open the door/cover on the electrical control box of the unit. This box can be opened by turning the main fused disconnect switch to the “off’ position (disconnect switch is optional on some units). Be sure to inspect all of the wire terminals and wiring terminations to ensure that connections are tight prior to startup of the unit. 8.0 LOCATION OF ACCESSORIES All field assembled sections must be sealed with water proof gasketing at the assembly joint. This gasketing must be placed directly onto the face of the joint to be bolted together in order to form a tightly sealed joint. Some of this gasketing material may squeeze out of the joint as it is pulled together. This excess should be trimmed off. The assembly joint should then be trimmed with regular silicone caulk to improve appearance of the unit and to prevent any water leakage into the unit. CDI provides the required gasketing with the unit. Caulk will also be supplied, if required, to provide proper sealing or if specifically requested for cosmetic purposes. See packing list for location of caulk and gasketing. Optional remote control panel and/or room stat(s) as required can be found by checking the Ship Loose Packing list as to where they are located in the unit at the time of shipment and these items must be removed and installed by the electrical contractor. (Refer to unit electrical drawings for terminations) The following is a basic recommendation as to how to install the remote components. A) Align the box with a spirit level. B) Examine wiring box and control panel for clearance before providing any conduit hole(s). C) All wiring must comply with applicable electric codes. 12 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual 9.0 ELECTRICAL CONNECTIONS separate conduit form power or line voltage— See electrical schematic located on electrical A complete wiring diagram of the equipment panel door or in the O&M manual. is included on the electrical panel door and in the O&M manual. 10. GAS PIPING All wiring will be done in accordance with the National Electrical Code. The unit must be electrically grounded in accordance with local codes. All wiring must comply with all applicable local, provincial, and national electric codes. Visually inspect all nameplates, control voltage wiring, control transformer, and main fused disconnect switch on the unit prior to running power to the unit. Cross check voltage with unit drawing to insure that the voltage option ordered is the voltage received. A manual shut-off (supplied by others) shall be installed on the outside of the unit’s gas vestibule to be used as the main shut-off of the unit’s gas supply, or as how local codes require the installation of such a valve. A minimum 1/8 inch NPT plugged tapping, accessible for test gauge connection, must be installed immediately upstream of the gas supply connection to the unit. All the different gas piping configurations are not shown in this manual because of the many manifold arrangements that are available for various building code and insurance company requirements, and types of gas modulation. Complete all wiring to any optional acces- Gas piping must comply with “Standards of sories as shown on electrical wiring diagram National Board of Fire Underwriters” and all before applying voltage to the unit. An optional applicable local codes and insurance comwiring junction box may be provided at the pany requirements. Contact the CDI factory shipping split if the unit is large enough to be for exact gas piping dimensions, if required. shipped in pieces. All wiring not attached at Gas pipes are taped off at the factory before the time of shipment will be numbered to aid shipment. Be sure to run correctly sized gas in the reattachment of the wires. line to unit (same size or larger than that used on the unit). Install a manual shut off valve and Be sure to reconnect the numbered a reducing regulator if required. A 1/4 inch NPT wires to the numbered terminals in pressure tap upstream of the unit regulator is recommended. electrical cabinet. Comply with the unit nameplate data when sizing fusing and the main power wiring to the unit. Check the supply voltage to the unit before energizing or turning on the main disconnect for the unit. Maximum variation in voltage should not exceed +/-10%. Phase voltage imbalance must not exceed 2%. Use proper wire sizing practices when running wires for the remote control panel and controls. NOTE: Gas line pressure must be as shown on unit name plate when unit is operating at full Input. On Indoor Units be sure to vent the pressure regulators, any vent valves and vent lines to outside of building. With vent pipe outside, install a proper vent cap and/or screen to prevent entrance of foreign material to prevent plugging. Some controls may require shielded cable and 13 Concepts and Designs Inc. solutions or brines are the only freeze-safe media for operation of water coils for low entering air conditions. 11. COIL PIPING When optional coils are provided, insure that distribution piping is of adequate size, and that required specialties if required, such as three- 5. Two position control valves, modulating valves, three way valves or a combination way valves, vent and drain valves and traps of these controls can accomplish control are correctly installed, and that actuators and of water coils. Follow the recommendavalves (if provided) are mounted and wired. tions of the control manufacturer regarding types, sizing and locations. Note: Always use a back up wrench on the coil connections when attaching the piping to the coil if pipe thread con- Note: Vent and Drain connections are provided on water coils when specified. nections are utilized. This allows the coils to be drained. Keep in mind that when draining the coils, all water may not drain from the coil. In order to completely drain the coil to prevent the possibility of freezing during cold ambient temperatures, air or nitrogen pressure must be utilized to blow any remaining water from the coil. Water Coil Installation Recommendations: Steam Coil Installation Recommendations: 1. Piping should be in accordance with ac- A. General cepted industry standards. Always use a back up wrench on the coil connections 1. Always use a back up wrench on coil connections when attaching piping to the coil. when attaching the piping to the coil if pipe thread connections are utilized. 2. Be certain that adequate piping flexibility is provided. Stresses resulting from ex2. Connect the water supply to the bottom pansion of closely coupled piping and coil connection on the air leaving side and the arrangement can cause serious damage. water return to the top connection on the air entering side. 3. Do not reduce pipe size at the coil return connection. Carry the return connection 3. When four connections are provided the size through the dirt pocket, making the extra bottom connection can be used for reduction at the branch leading to the trap. an auxiliary manual drain connection, and the extra top connection can be used for an automatic air vent or the extra con- 4. Vacuum breakers and air vents must be installed on all applications to prevent retainnections can be capped. Connecting the ing condensate or air in the coil. Generally supply and/or return in any other manner the vacuum breaker is to be connected will result in very poor performance. between the coil inlet and the trap. For a system with a flooded return main, the 4. Water coils without glycol added are not vacuum breaker should be open to the normally recommended for use with enteratmosphere and the trap design should ing air temperatures below 40°F. Glycol allow venting of large quantities of air. 14 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual 5. Do not drip steam mains through coils. minimum. General recommendations for component selection and line sizing follow. Nitrogen charged and capped piping is recommended. 6. Insure steam pressure and condensate line pressure differential is sufficient to allow efficient condensate removal from the steam coil, especially when using modu- A. Liquid Line Sizing lating steam control valves to control the leaving air temperature of the coil. 1. All compressors have a Refrigerant Charge Limit [RCL] that must not be ex7. Do not attempt to lift condensate without ceeded. Since the RCL and pressure drop the assistance of a condensate pump. The are in direct conflict with each other, CDI pressure required to lift condensate must recommends that the liquid line be sized also be considered for sufficient pressure as small as possible, while maintaining a differential. low enough pressure drop to ensure 5°F of sub-cooling at the expansion valve. Check valves are also required to prevent reverse flow of condensate back into the coil. B. Liquid Line Components 8. Entering air temperatures should not be 1. CDI recommends the use of a properly sized liquid line filter-drier, installed upbelow 40° F to insure freezing doesn’t ocstream from the expansion valve and as cur unless steam is always applied to the close to the evaporator coil as possible. coil to prevent freezing. Filter-drier selection should be based on a maximum pressure drop of 2 psi at the B. Traps design condition. 1. Size traps in accordance with the manufacturer’s recommendations. Be certain 2. A moisture indicator / sight glass should be installed between the expansion valve and that the required pressure differential will filter-drier. The moisture indicator / sight always be available. Do not undersize. glass must be sized to match the size of the liquid line at the thermal expansion valve. DX Coil Installation Recommendations: 1. DX coils sold in units built by CDI are 3. A liquid line shut-off valve with an access port should be sized with the selected shipped with a small nitrogen holding liquid line OD, and installed close to the charge. Care should be taken when opencondenser, ing these coils for installation. DX coil distributors have caps installed with soft silver solder. Once the cap is removed 4. The use of other valves, tube bends and reducers should be minimized, since these and if the TEV is to be installed using anyitems tend to increase pressure drop and to thing other than soft solder, the distributor reduce sub-cooling at the expansion valve. connection should be sufficiently cleaned with emery cloth to remove the soft solder. Follow accepted refrigeration piping prac- 5. The Thermal Expansion Valve [TEV] must be selected for proper size, capacity and tices and safety precautions per ASHRAE refrigerant being used. A slightly oversized Standards. If bends or 90’s are necessary, valve will allow the unit to operate satisfaclong radius fittings must be used to keep torily at low-load conditions. An undersized the pressure drop through the piping at a 15 Concepts and Designs Inc. valve should not be used at any time as D. Suction Line Components: this will starve the evaporator of refrigerant causing insufficient air temperatures. The 1. A suction line pressure tap should be inuse of a hot gas bypass valve should also stalled on the leaving side of the evaporabe considered when sizing the TEV. Select tor coil near the TEV sensing bulb location. expansion valves with external equalizer Accurate superheat measurement and connections, and those designed to operTEV adjustment demands that suction ate against a backpressure of 20 pounds pressure and temperature be measured per square inch higher than actual evaponear the evaporator coil outlet. rator pressure. 2. Suction line filter-driers are usually only nec6. The TEV must be installed directly on the essary on systems that have experienced a evaporator coil liquid line connection prosevere compressor motor burn out or other vided. The liquid distributor must be in a failure that results in extremely high refrigvertical position. Insure that the distribuerant temperature. This filter-drier should tor nozzle is installed in the distributor if not be left in the suction line permanently. required and that the correct nozzle for the refrigerant being used is installed. 3. Suction lines should be insulated completely Sensing bulbs must be mounted on a with sufficient wall thickness insulation for clean horizontal suction line close to the the application temperature range being evaporator outlet and insulated properly. utilized. The bulb must be tight against the suction line at a 10 or 2 o’clock position, but take Installation Checklist: care not to over tighten and cause damage to the sensing bulb. The bulb should Use the following checklist to verify that all not be mounted directly on top or bottom necessary installation procedures have been of the suction line. completed. CAUTION: Disassemble the thermal expan- 1. Coils are installed with airflow in same dision valve before completing the brazing conrection as indicated on the coil nameplate nections. If necessary, wrap the valve in a cool or casing. wet cloth while brazing. Failure to protect the valve from high temperatures may result in 2. Suction connection is at the bottom of damage to the internal components. the suction header on the evaporator coil, suction line is pitched towards compressor C. Suction Line Sizing: and traps are installed in suction risers. Suction line is insulated with correct wall 1. Suction line tubes must be sized to mainthickness insulation for the temperature tain refrigerant vapor velocities that are application utilized. high enough to ensure good oil return to the compressor under all operating condi- 3. Condensate drain pans and piping is intions. It is necessary to pitch horizontal stalled with a trap in the condensate line suction lines toward the compressor to inand piping insulated and heated if installed sure sufficient oil return to the compressor. in applications that are below freezing. Traps should be provided at the bottom of suction line risers and at 15 foot intervals 4. Clean filters are installed upstream of the for sufficient oil return. condenser coil when applicable. 16 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual 5. A liquid line filter-drier is installed upstream of the expansion valve. 2. Remove large debris from the coils and straighten fins before cleaning. 6. A moisture indicator/sight glass is installed between the expansion valve and filter-drier. 3. Clean refrigerant coils with cold water and detergent or with one of the commercially available chemical coil cleaners. Rinse coils thoroughly after cleaning. 7. A liquid line shut off valve with access port is installed close to the condenser. CAUTION: Do not clean the coil with hot water or steam. The use of hot water or steam as a 8. A schrader valve is installed in the suction refrigerant coil-cleaning agent will cause high line close to the evaporator coil outlet. pressure inside the coil tubing and subsequent damage to the coil. 9. The TEV, with external equalizer connections, is installed directly on the evaporator CAUTION: Do not use acidic chemical coil liquid connection, sensing bulb mounted in cleaners. Do not use alkaline chemical coil the horizontal position on the suction line cleaners that, after mixing, have a ph value and insulated. The liquid distributor must greater than 8.5 without also using an aluminum corrosion inhibitor in the cleaning be in a vertical position. solution. Failure to follow these guidelines 10. Piping system is leak-tested with dry or the manufacturer’s instructions for use nitrogen, evacuated to 500 microns, and of cleaning chemicals could result in damcharged with correct refrigerant type and age to the unit. amount. Fin Straightening: 11. Superheat and sub cooling measurements are taken. Thermal expansion valve is ad- 1. Coil fins may have been bent during shipping or servicing, should be straightened justed to obtain desired superheat. Desired to maintain maximum heat transfer. Reducsuperheat on most applications is 8° to 12° tion of the effective coil surface will corat the outlet of the evaporator. respondingly reduce coil capacity. Always check fin appearance after any handling 12. COIL MAINTENANCE: of the coil and after any servicing is done near the coils. Coil Cleaning: 1. Coils should be kept clean to maintain 2. Fin combs are sized according to number of fins per inch of the coil. For relatively maximum performance. For operation small bends that require only minor repair, at it’s highest efficiency, the coil should other tools may be used to evenly space be cleaned often during periods of high the fins. Be careful not to damage the coils. cooling demand or when dirty conditions prevail. Power should be disconnected and locked out and motors should be covered 13. CONDENSATE DRAIN CONNECTION to insure that no moisture penetrates into the windings causing motor failure if apAll unit drains require pressure traps in order plicable. to prevent tramp air from entering or exiting the unit. Minimum vertical dimension of each trap must be calculated from the submittal 17 Concepts and Designs Inc. documents. Traps associated with latent (wet) coils should be filled with water prior to unit startup. Traps associated with sensible only (dry) coils may be filled with mineral oil to prevent evaporation, and maintain the seal. If then unit has a condensate pan, such as under a cooling coil, the unit will be provided with a male NPT condensate drain connection. Refer to unit drawings for the exact location. The unit and drain pan must be level side to side and a P-trap must be installed for proper drainage. CDI units may have positive or negative pressure sections. It is recommended that the traps be used in both cases with care given to the negative pressure sections. Dimension A should be a minimum of 8”. As a conservative measure to prevent the cabinet static pressure from blowing or drawing the water out of the trap and causing air leakage, dimension A should be two times the maximum static pressure encountered in the coil section in inches of W.C. Drainage of condensate directly onto the roof may be acceptable; refer to local codes. It is recommended that a small drip pad of either stone, mortar, wood or metal be provided to protect the roof against possible damage. If condensate is to be piped into the building drainage system, the drain line should be pitched away from the unit at a minimum of 1/8” per foot. The drain line must penetrate the roof external to the unit. Refer to local codes for additional requirements. Sealed drain lines require venting to assure proper condensate flow. Where the coils have intermediate condensate pans on the face of the evaporator coil, PVC tubes on the end of the intermediate pan provides drainage into the main drain pan. Because drain pans in any air conditioning unit will have some moisture in them, algae, etc. will grow. Periodic cleaning is necessary to prevent this buildup from plugging the drain and causing the drain pan to overflow. Also, the drain pans should be kept clean to prevent the spread of disease. Only qualified personnel should perform cleaning. 18 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual 14 . DUCT CONNECTION(S) or outlets. Caulk the mating surfaces to make the connection water tight. Connect supply and return ducts as specified in the submittal documents. Insure that duct opening(s) to building is adequately flashed and sealed to prevent moisture leakage. A) Indoor Units 1) Lifting lugs may serve as suspension points on all indoor style units. (Customer should provide service platforms for suspended units unless unit was ordered with optional service platform.) 12) The optional snow proof inlet hood (See Figure below) may require additional support in certain wind loading conditions or hood designs. Provide adequate support from building structure taking care not to reduce the weather integrity of the building or intake hood. 2) Make required fresh air opening(s) in wall and line with an angle frame. Inside should be completed before outside is started to avoid any crumbling of penetrated wall. 3) Utilize an insulated fresh air collar through the opening with flanges turned out to provide rigidity. 4) Anchor intake hood with bird screen (if supplied) to outside of wall. 5) Caulk perimeter of opening to make connection water tight. 6) Reactivation ducts require external insulation because of the potential for condensation. 7) Pitch reactivation discharge duct down away from the DH unit, and toward the building exterior. Control Overview 15. MAKEUP AIR APPLICATIONS 8) Avoid traps in reactivation discharge duct! Provide low point drains if necessary. Refer to submittal documents for specific information about any preconditioning equipment, such as enthalpy recovery devices, precooling coils, mixing boxes, etc. 9) Avoid locating reactivation discharge near fresh air intakes. 16. RETURN AIR APPLICATIONS 10) Seal all ductwork to prevent moisture infiltration. B) Outdoor Units Standard DH equipment runs in response to a space humidistat only. Limited outside air quantities may be introduced through optional fresh air damper when unit is running in response to room humidistat. 11) Fasten weather-hoods to any air inlets 19 Concepts and Designs Inc. With power applied, and the main disconnect switch closed; tem. This is a microprocessor based electronic system providing rapid response to rotor inlet air temperature and discharge air temperature. On call for dehumidification (Humidistat, or It is intended to protect the desiccant rotor unit “manual” switch): process and reactiva- from excessively high temperatures, provide tion fan motor starters are energized through full dehumidification capacity, even on cool (optional) normally closed return air smoke days, and allow for economical operation durdetector contacts. ing moderately humid days. Units with optional Modulating Face and Bypass humidity control dampers are energized via an end switch on the damper actuator. Process fan operates continuously when enabled by remote panel switch. Humidity is controlled through variable desiccant rotor and bypass air flows. The system consists of a microprocessor controller, an electronic modulating valve, signal conditioner, rotor inlet temperature sensor and discharge temperature sensor. Gas flow is modulated by the modulating valve based on a signal from the controller, through the signal conditioner. Rotor inlet temperature is maintained at a pre-programmed value until Desiccant rotor drive starts. the discharge sensor, via a rising discharge temperature, indicates a reduced humidity Roller switch, LS-08 (on rotor perimeter), re- load. During part-load situations, the inlet temsets time delay relay RE-04 on every rotation, perature is reset down in order to economize in order to verify desiccant rotor rotation. If on energy use. rotation is not detected, unit shut down occurs. Reset by pressing the reset button on When the humidity control (humidistat) is satiselectrical control door. fied, unit process fan and reactivation burner cycle off. The reactivation fan, and desiccant Reactivation air proving switch and reactiva- drive continue to operate for two minutes in tion fan motor starter auxiliary contacts prove order to cool the desiccant rotor and related airflow and energize reactivation burner con- components. troller. Burner initiates pilot trial for ignition after 7-second purge period. The flame safety relay senses pilot flame and energizes main gas valve and modulation circuit. 17. UNIT SHUT DOWN CAN RESULT FROM: A) Burner flame failure/failure to ignite. B) High reactivation air temperature. C) Loss of supply air flow. Burner fires to maintain specified reactivation inlet and discharge air temperatures pro- D) Process or reactivation motor overload. grammed into the reactivation temperature controller. Burner high temperature limit in hot E) Loss of desiccant rotor rotation. plenum de-energizes burner in the event of an overheat condition. F) Smoke in the process air stream. (Optional smoke alarm) Reactivation firing rate is continuously controlled by a dedicated firing rate control sys- G) Humidistat satisfied. 20 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual 18. HEATING APPLICATIONS Refer to submittal documents for specific information about post-heating devices, such as direct, or indirect heating equipment, steam or hot water coils, etc. 19. ELECTRICAL PARTS AND OPTIONS FREEZE PROTECTION A vacuum switch sets to de-energize the reactivation burner when the filters become dirty. Operating the unit in this condition would result in improper combustion. The design of the clogged filter switch incorporates a sensitive diaphragm, single pole double throw snap action electrical switch, visible on-off indicator in a compact die-cast aluminum housing. Spring adjustable switches have dual scales calibrated in millimeters and inches of water column mounted in front and easily visible. AIRFLOW SWITCH There are many circumstances which could prevent the burner from lighting. Should a malfunction or trip of a safety or operating control prevent burner operation, intemperate air may be discharged into the heated area. Freeze protection consists of a freeze thermostat with a startup bypass timer and will prevent intemperate air to be discharged into the area being heated. Freeze protection is actually for building protection only and is recommended whenever a makeup air unit will be operating unattended for any period of time. All Concepts and Designs Make‑Up Air Units are provided, as standard, with a flame failure lockout relay. This relay de‑energizes the unit whenever a flame failure occurs that can be detected by the flame rod or optional UV detector. A vacuum switch sets to de-energize the burner whenever the airflow across the burner falls below the set point of the airflow switch. The airflow switch is also used as a proving switch that will let a system controller know when there is enough airflow to begin any other operation required by the unit or just to prove that there is airflow in the unit. HIGH/LOW GAS PRESSURE SWITCHES CLOGGED FILTER SWITCH The gas pressure switches monitors gas pressure and shuts the unit off when the pressure drops below or rises above the desired preset point. The position of the yellow ring, on the reset button, shows whether the reset button is on or off. If the yellow ring on the button is below the cover, the unit is on. If the yellow ring 21 Concepts and Designs Inc. is above the cover, the unit is off. The yellow ring must be below the cover after latching to be properly set. any comfort or control level. The humidistat controls the unit through an ON/OFF contact. REMOTE TEMPERATURE / HUMIDITY TRANSMITTER SMOKE DETECTOR Duct Smoke Detectors provide early detection of smoke and products of combustion present in air moving through an HVAC duct. These devices are designed for prevention of smoke recirculation in areas by the air handling systems. Fans, blowers, and complete systems may be shut down in the event of smoke detection. The detector offers a universal voltage input compatibility on any one of four input voltages. Air sampling is accomplished by two tubes which protrude into the duct. The remote temperature humidity transmitter lets you enjoy the comfort that comes with a more precise regulation of your indoor environment. The transmitter lets you monitor and control both the temperature and the humidity levels in your facility. With a versatile operating range to control the % of humidity and the temperature, the unit accommodates any comfort or control level. This transmitter comes in both a wall mount and a duct mount model. DELUXE REMOTE CONTROL BOX REMOTE ON/OFF HUMIDISTAT The remote humidistat lets you enjoy the comfort that comes with precise regulation of your indoor environment. The humidistat lets you monitor and control humidity levels in your facility. With a versatile operating range to control the % of humidity, the unit accommodates The Deluxe remote unit features a backlit graphic display that is designed for the user friendliness of controlling the unit from a remote location. The Deluxe remote also has a Manual/OFF/AUTO switch with display lights for faults and correct operation of the unit. This 22 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual remote unit allows the customer to easily see what the unit is doing and they are also able to see and change what the set points are for the unit’s temperature and humidity levels from this remote display rather than having to go up to the unit to make any changes. REMOTE CONTROL BOX and they are able to see and change what the set points are for the unit from this remote display rather than having to go up to the unit to make any changes. ANNUNCIATOR PANEL (See Picture Below) The annunciator panel is a series of lights and a bar graph mounted onto the unit or remote panel which enables a service man to both monitor the operation of the unit and assist in tracing down a component failure. The remote unit features a 120 x 32 backlit graphic display and 6 backlit buttons that is designed for the user friendliness of controlling the unit from a remote location. It is available in a wall or panel mounting version, which promotes a consistent look and feel for multiple applications. This remote unit allows the customer to easily see what the unit is doing 23 Concepts and Designs Inc. Operation of the Basic pCO3 Carel Controller This is the program on a basic DH unit; Your program may be similar to this one or may be a custom program that will have some different screens and features. 1. When you first power up the controller you will first see this on the screen. 3. After the unit has completed the self-test, it will change to the following screen. Supply Fan:On DH Status:Drying ******HH:MM:SS****** Concepts and Designs Loading.... 2. Then it will change over to this self-test 4. The Above screen shows the status of the mode. Supply fan (if it is ON of OFF), what the DH Status is (Off or Drying mode) and the time of day read in Military time (24hr clock). ################## selftest please wait ################## 5. The Escape button on the controller will take you back to the beginning screen if you push it. 24 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual 6. By using the up and down arrow buttons you can scroll through the menu screens on the controller. 9. If you arrow down once again it will take you to the screen below showing what the humidity transmitter is reading only if using a transmitter input. Humidity:000.0 7. If you arrow down once it will take you to the screen below showing what the controller is seeing for the Reactivation Heated to temperature is trying to achieve, the actual RIT (reactivation inlet temperature) reading. The actual ROT (reactivation outlet temperature) reading, and the percent of output to the modulating controller for heating the rotor (example; 10%=1VDC, 50%=5VDC and 10. If you arrow down once again it will 100%=10VDC). take you to the screen below showing what the Analog Humidity setpoint is for internal Reac SetPt: 285.0º and also if there is an external source. This one is active on Internal Setpoint value RIT: 284.0º (runs on an on off signal) Valid Only if Using Transmitter Input ROT: 125.0º Reac Ht Rate: 050.0% Analog Humidity SP Internal SP: 050.0 External SP: 000.0 Active SP: Internal 8. If you arrow down once again it will take you to the screen below showing what type of input the controller is looking for to Call for Dehumidification. Dehumidification On Command: 11. If you arrow down once again it will take you to the screen below showing if the Unit Run switch is turned on and if the unit is calling for DH mode. Unit Run Enable:ON Call For DH:ON On/Off Via ID2 Stat 25 Concepts and Designs Inc. 12. If you arrow down once again it will 15. If you arrow down once again it will take you to the screen below showing; If take you to the screen below displaying the the reactivation fan is On or Off. If the ReRotor and Supply Fan run time for this unit. activation Energy (voltage to the Heater) is activated. If the Rotation Switch has been energized (this will come on once every rotation of the rotor as it passes the cam or magnetic sensor. And if the DH Rotor Purge is enabled. Rotor Run Time 000000 Hours Supply Fan Run Time 000000 Hours React Fan Status:ON React Energy:ON Rotation Switch:OFF DH Rotor Purge:OFF 16. If you arrow down once again it will take you to the screen below displaying the program and rev information and a number to call if you need help. 13. If you arrow down once again it will take you to the screen below showing What the output the Face and Bypass Damper is if the unit has one installed. Concepts and Designs 10800244 Rev1 For Help Call: 507-451-2198 Optional Face/Bypass Rotor Face Damper 000% open once again it 14. If you arrow down once again it will 17. If you arrow down will take you to back to the first screen take you to the screen below displaying (see #3). the information that is used for a steam unit only. Steam Units only 18. The Alarm button when the unit is in alarm. ROT: 140.0º Stm Ht Rate: 000.0% 26 will light up red DH Series - SSCR Rotor Installation, Operation and Maintenance Manual 19. To view the alarms; a. Push the Alarm Bell button **************************** External Fault **************************** and then scroll using the up and down arrow buttons to view all the alarms before resetting. 21. Press the down arrow again to see if there are any more faults, if there is, you will see what that fault is and can ****** Alarms ****** Press Enter to Reset All Alarms Arrow to View Alarms arrow down are any more. again to see if there Below are a few more of the faults that you may see: b. Next, press the Enter button if you want to reset all of the alarms before viewing them. c. If you press the Enter button before pushing the up **************************** External Fault **************************** and down This alarm tells you something connected to arrow buttons to scroll through the customer fault input had shut down the the alarms you will not know if the unit unit. was down on more than one alarm. 20. To view what Alarms the unit is down on **************************** React High Temp Alm **************************** press the up or down arrow to see what alarm that has caused the unit to shut down. In this example we will press the down to view what some of the alarms could be (they may not show up in This alarm tells you that you will need to reset this order). the High limit mounted on the reactivation tunnel first before this alarm can be reset. 27 Concepts and Designs Inc. **************************** Supply Fan Fail **************************** **************************** React Flame Fail **************************** This alarm tells you the flame safety for the This alarm tells you that the Supply airflow gas reactivation alarmed and will need to be switch did not close due to the fan relay not reset before you can reset the controller alarm. closing or the supply fan is not running or tripped out or something else within that circuit. 22. To view Alarm History, push the alarm bell button twice play the Alarm Log. **************************** Rotation Fault **************************** and this will dis- a. The alarm log will show the most recent alarm the unit went down on first; If you want to view the rest of the alarms you This alarm tells you the DH rotor was not rotating or has not been hitting the rotation switch to prove rotation of the rotor. will need to push the up button. arrow 08:35:27 10/25/09 001:React High Temp RIT: 325.5 ROT: 135.2 **************************** React Low Temp Alm **************************** This alarm does not shut the unit down, but tells you that the reactivation outlet temperature was below the 95º set point for 15 minutes. You cannot reset this alarm until the outlet temperature get above 95º or you power down the unit. 28 b. The Screen shown above shows that on this unit the most recent alarm 001: is as follows: i. The unit went down on Reactivation High Limit on October 25, 2007 at 8:35AM, the reactivation inlet temperature was 325.5ºF and that the reactivation outlet temperature was 135.2ºF. DH Series - SSCR Rotor Installation, Operation and Maintenance Manual c. To see the next alarm 002: in the history press the up tion inlet temperature was 125.5ºF and that the reactivation outlet temperature was 90.5ºF which is below the minimum outlet temperature for a period of 15 minutes. arrow. 10:15:27 09/21/09 002:Rotor Rot Fault RIT: 265.5 ROT: 145.5 g. Use the Up arrow button to scroll to see what other alarms the unit went down on or press the Down arrow button to scroll back to the most recent alarm in the history and then d. The Screen shown above shows that on this unit alarm 002: is as follows: i. The unit went down on Rotor Rotation on September 15, 2007 at 10:15AM, the reactivation inlet temperature was 265.5ºF and that the reactivation outlet temperature was 145.5ºF. This fault was possibly caused from the unit not proving rotation of the rotor in a 10 minute cycle. press the escape button to exit and go back to the original screen. h. If you want to clear the alarm history in the controller you will need to press Up and Down arrows at the same time and hold for several seconds. 23. If you have the Service Password, you e. To see the next alarm 003: in the history press the up can use the Program button to enter other parts of the program, like the Service Menu. (This is not recommended for the basic user, only for a qualified service technician) arrow. 10:15:27 09/21/09 002:React Low Temp RIT: 125.5 ROT: 90.5 If you have any further questions or need help with going through the menus please contact the Customer Service Department @ 507-451-2198. f. The Screen shown above shows that on this unit alarm 003: is as follows: i. The unit went down on Low Reactivation Temperature on September 11, 2007 at 09:20PM, the reactiva- 29 Concepts and Designs Inc. Start Up The unit must be isolated from the gas supply piping system by closing the manual shut-off valve located in the gas vestibule during any pressure testing of the gas supply piping system at test pressures equal to or less than ½ psi. 20. SPECIAL TOOLS REQUIRED The following specialty tools are required at the time of startup. (The complexity of the unit will dictate how many of the following are actually required in order to complete the startup) A) Locate and have ready the “Field Startup“ form, one copy is included in a plastic sleeve hanging in the electrical control panel enclosure. Ammeter, Amprobe or Equal. Ohm Meter / Volt Meter NOTE: This form must be completed and returned directly to Concepts and Designs, Inc. In order for the WARRANTY on the unit to be valid. Complete the form as the startup is performed using but not limited to the following Instructions. Gas Pressure Gauge 0 to 30” W.C. Gas Pressure Gauge 0 to 10 PSIG. U‑Tube Manometer 0 to 6” W.C. or suitable differential pressure gage. B) Perform the Pre‑Start Inspection, Including but not necessarily limited to: Temperature Gauge (450º F maximum needed). 1) Remove any shipping blocks from units. Temperature/Relative Humidity Meter (Hygrometer). Rotating Vane Anemometer or Equal. 2) Measure supply voltage and make sure it agrees with the unit nameplate. 21. PRECAUTIONS BEFORE ATTEMPTING STARTUP OF THE DESICCANT DEHUMIDIFIER 3) Check all electrical connections in the main control panel and remote control panel (if supplied) for tightness. All the information below pertains to a gas fired reactivation unit. All others (electric, steam, etc.) will be somewhat similar to this is one form or another. (Please refer to the unit specific sequence of operation for the proper operation of your unit) 4) Check to see that all fuses are installed, and are of the correct value. The unit and its manual shut-off valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of ½ psi or greater than the inlet pressure that is noted on the unit name plate. 6) Verify that supply gas line to the dehumidifier was blown clean prior to connection to the dehumidifier Purge gas lines of air. Close Manual gas valves before supplying main gas pressure. 5) Make sure all fuel connections are tight and that all joints have been properly sealed. Use soap test for assurance. 30 7) Measure the supply gas pressure and DH Series - SSCR Rotor Installation, Operation and Maintenance Manual make sure it agrees with the unit nameplate. (Gas pressure over that specified in the nameplate can result in damage to components.) 8) Check unit return or outside air inlets to insure that they are free of any obstructions. 22. STARTUP All safety and operating controls have been checked during the factory test period, however, it is advisable to complete a similar check when first operating the unit. A) Check and reset all manual safeties. 9) Check unit supply air outlet, and supply blower inlets for obstructions. 1) The High limit switch is mounted on the reactivation tunnel in downstream side of desiccant wheel in supply air stream may have to be reset. 10)Check supply air blower assembly to insure freedom of shaft rotation and proper belt tension. 11)Check supply air blower assembly to insure that pulleys are aligned and secure. 12)Check reactivation air blower assembly to insure freedom of shaft rotation and proper belt tension. 13)Check filters for cleanliness, replace if dirty or damaged. 14)Make certain that all damper linkage (If provided) is free to move and that no binding will occur. Air dampers that operate in normally open position are shipped in closed position in order to minimize shipping contamination. 15)Check inside unit for general cleanliness, close and secure access doors. 16)Main gas and pilot manual gas valves must be in the “off’ or “closed” position. 17)Check reactivation High Limit switch setting; it should be set at or slightly below 350º F. (Unless unit is designed for a higher reactivation inlet temperature) 18)Inspect the desiccant rotor and seals for damage and or binding. 2) Gas pressure switch(es) (if supplied) may have to be reset. (The upstream manual valve must be open to reset the low pressure switch.) B) Open pilot line gas valve and purge air from gas line through the plugged test port in pilot line. C) Close main disconnect switch. D) All three phase motors were properly phased during factory testing. If rotation is reversed, interrupt main power supply and interchange any two of the incoming power leads. Reestablish power and recheck the blower direction and desiccant rotor drive operation. E) On three phase units, the starter contacts should pull in and hold quietly without “chatter” (relays serve as starters on single phase units). If they do not operate quietly, check immediately for proper line voltage or foreign material in the starter contactor. Low voltage noted at startup will cause persistent operating trouble and must be corrected before the unit is placed into service. F) Recheck all set screws or bolts on motor sheave, blower sheave, and blower wheel(s). Spin the blower wheel on direct drive fans to insure there will be no rub- 31 Concepts and Designs Inc. bing during operation. Check alignment of belts and pulleys. Run blower for a few minutes and readjust the belt tension, if necessary. Do not over tighten belts since excessive tension will reduce belt life and cause excessive loads on bearings. After initial startup has been made, give the belts a few days running time to become seated into pulley grooves, then readjust as necessary. Run the unit and adjust belt tension until only a slight bow appears in the slack side of the belts. NOTE: DO NOT roll belts over grooves or sheaves, as this results in permanent belt damage. G) Move “Manual/Off/Auto” switch to “Manual” position to start the unit. (If the unit has optional face and bypass dampers they may require control signal to open.) The blowers and desiccant rotor will start. Using a manometer, (unless magnehelic are installed on unit) verify correct differential pressure across process and reactivation test ports. After a seven second purge, the pilot will ignite. If pilot does not light, the flame safety relay will alarm. The alarm is reset by pushing the reset button on the Flame Safety Device. Ensure that the supply gas line has been purged. If it becomes necessary to adjust pilot flame, connect a manometer to the pilot gas test port. Connect a voltmeter to the test points on the Flame Safety Device. With the pilot established adjust the pilot regulator to a reading greater than 1.5 volts. (This is accomplished by using the optional Keyboard Display Module or by measuring the voltage at the flame current test jacks on the Flame Safety Device) The manometer should indicate a pilot gas pressure of approximately 3-5” W.C. for natural gas (usually 2.5 to 3”), and 5-9” W.C. for propane gas (usually 6 to 8”) is enough or what ever it takes to get the best DC voltage Keyboard Display Module Flame Safety Device output from the flame safety (make sure the signal is over 2 VDC). Make sure all manual gas valves are open and (optional) gas pressure switch(s) are reset for burner operation. H) With pilot established, main gas valve(s) open to burner. I) 120-140º F reactivation discharge temperature is desired. Because the desiccant has been collecting moisture during shipment, the reactivation discharge may be lower than 120º F until the moisture load 32 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual stabilizes, normally after about one hour or so of operation. Measure reactivation air discharge temperature after one hour of continuous operation. Maximum and minimum firing rate settings are factory set for proper operation with the specified inlet gas pressure. If field reactivation firing rate adjustments are necessary, be sure to keep continuous flame across the full length of burner on low fire and do not exceed maximum unit capacity on high fire. 2) Remove the seal cap (A) and turn regulator pressure adjusting screw to obtain desired manifold pressure. (Clockwise rotation increases pressure) (See Figure 20.2). J) Unit manifold pressure is factory preset to provide the required capacity as stated on the unit nameplate for the burner at high fire. Before making any regulator adjustments, be sure there is adequate supply pressure and the output to the modulating valve is at 15 to 20 volts. K) Modulation systems adjustments for different modulating valves are as follows: MR212 VALVE HIGH FIRE MANIFOLD ADJUSTMENTS 1) Apply either a 10 volt or 20mA signal (depending on what you have the input signal set for on the dip switches) to terminals #5 & 6 on the Maxitrol SC11 amplifier (See Figure 20.1). This will cause the valve to call for continuous high fire. Figure 20.2 MR212 VALVE LOW FIRE OR BY PASS ADJUSTMENT 1) Disconnect wires from terminal #1 on the Maxitrol SC11 amplifier (See Figure 20.1). This causes the valve to call for continuous low fire. Figure 20.1 33 Concepts and Designs Inc. 2) Remove seal cap (B) and loosen lock screw (C). Turn (D) to desired low fire adjustment. (Clockwise rotation reduces minimum flow rate) (See Figure 20.2) 3) Tighten set screw (C), replace cap (B) and reconnect wire to terminal #1. M611 VALVE HIGH FIRE MANIFOLD ADJUSTMENT. 1) Apply either a 10 volt or 20mA signal (depending on what you have the input signal set for on the dip switches) to terminals #5 & 6 on the Maxitrol SC11 amplifier (See Figure 20.1). This will cause the valve to call for continuous high fire. M) Check all of the safety devices to make sure that the unit will respond properly to 2) Adjust the pressure regulator to obtain each device and shut down if required. the manifold pressure stated on the unit name plate (4.5 W.C. max.) O) Move “Manual/Off/Auto” switch to “Auto” position to start the unit. The unit M611 VALVE LOW FIRE OR BY will now automatically run and maintain PASS ADJUSTMENT. the discharge temperature that is programmed into the controller. 1) Disconnect wire from terminal #1 on the amplifier (See Figure 20.1). This 23. TYPICAL SEQUENCE OF causes the valve to call for continuous OPERATION low fire. 2)Remove cap (A) and turn adjusting screw (B) to desired low fire adjustment (See Figure 20.3 ). 3)Replace cap (A) and reconnect wire to Terminal #1. On the Following, five pages are some of the typical sequence of operation procedures for the different types of control procedures used in controlling the operation of the unit depending on the complexity of the unit. L) Test for gas leaks in the gas train, then spray the gas train with WD-40 or equivalent, to help aid in the prevention of any rust forming on the piping in the future. 34 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual Field Wiring RRC Microprocessor Dehumidifier Controller RRC Optional Remote Control Station (Mounting and Wiring by Contractor) Unit Control Panel with Terminal Strip Connections Desiccant Inlet Outdoor Air Sensor Desiccant Outlet Sensor Wet Air Out Reactivation Air Filter Reactivation Burner, Electric Resistance Heater, or Steam Coil Fresh Air Optional Outside Air Manual or Automatic Damper Return Air Filters Desiccant Rotor Supply Air Field Wiring Fan Return Air From Space or from Optional MDH Section Supply Air to Space (Or to Post Heating and Post-Cooling Section) Optional Room Humidistat or Humidity Controller (Mounting and Wiring by Contractor) Sequence of Operation With unit disconnect switch closed, Microprocessor and ancillary components are energized. The "Power On" indicator light on unit annunciator will energize. Reactivation burner or electric heater firing rate is controlled via microprocessor controller as follows: With selector switch in “Manual” or “Auto” position, and safety circuits normal, supply fan operates continuously, and (optional) motorized outdoor air damper drives open. On a call for dehumidification, reactivation fan, desiccant rotor drive and reactivation burner are energized as required to maintain space humidity (adjustable setpoint) via room humidistat. "Call for Dehumidification" light on unit annunciator will energize. 15 seconds after opening of main gas valve, the "Burner On" light on unit annunciator will energize. The firing rate is modulated as follows: On units supplied without optional remote control panel, unit cycles in response to call for dehumidification from room humidistat exclusively. Reactivation burner ignition and flame management on gas fired units are controlled via a dedicated flame safeguard system and proven via flame rectification. Pre-ignition interlocks include reactivation airflow differential pressure proving switch, and manual reset high temperature limit switch. (1) Desiccant reactivation inlet temperature is maintained at optimum temperature for maximum dehumidification performance irrespective of outdoor temperature or filter loading. (2) As moisture load decreases, reactivation outlet temperature rises, and microprocessor controller resets reactivation inlet temperature down as required to limit reactivation outlet temperature. (Optional) Steam reactivation units use reactivation air volume rate modulation. Reactivation outlet temperature modulates reactivation airflow via variable frequency drive or (optional) modulating damper. Reactivation Inlet temperature is available for diagnostic information. Fail-Safe Mode: In order to preserve limited performance, in the event of a sensor failure, the microprocessor controller will deliver burner rate signal as follows: (1) With failed desiccant reactivation inlet sensor, burner output signal is 50%. (2) With failed reactivation outlet sensor, desiccant reactivation inlet is maintained at 260 degrees F. (3) With diminished reactivation airflow (I.e. dirty filters) desiccant reactivation inlet temperature is limited in order to prevent rotor overheat. (4) With overheat caused by an abnormal condition, a manual reset high temperature limit in desiccant reactivation inlet air stream cycles burner off. Dehumidification Reactivation Rate Control (RRC) G:\Engineering\Templates\Sequence of operations\DH,MDH,RRC,HCFB Controllers\RRC-Carel Control Sequence 8x11 11-9-05.vsd 35 Unit shutdown occurs via the following: Desiccant rotor rotation is proven via roller switch input to the RRC controller. If rotation is not detected within programmed time, unit shutdown occurs. The "Rotation Fault" light on unit annunciator will energize. Adequate reactivation energy is proven via reactivation outlet temperature. If adequate leaving temperature is not sensed within the programmed time. The “Low Reactivation Temp” light on unit annunciator will energize. Unit will continue to run. Other customer or factory furnished devices may be installed to initiate unit shutdown via “External Faults” input. Unit shut-down occurs upon closing of customer contacts, or installed factory contacts, or loss of supply airflow. The “Other Faults” light on unit annunciator will energize. Flame failure via flame safeguard relay causes unit shut-down in the event of failure to ignite or maintain pilot flame. The “Flame Failure light on unit annunciator will energize. DH Series Concepts and Designs Inc. Field Wiring RRC Microprocessor Dehumidifier Controller RRC Optional Remote Control Station (Mounting and Wiring by Contractor) Unit Control Panel with Terminal Strip Connections Desiccant Inlet Outdoor Air Sensor Desiccant Outlet Sensor Wet Air Out Reactivation Air Filter Reactivation Burner, Electric Resistance Heater, or Steam Coil Fresh Air Optional Outside Air Manual or Automatic Damper Return Air Filters Desiccant RotorOptional Return Air From Space or from Optional MDH Section Face & Bypass Dampers Supply Air to Space (Or to Post Heating and Post-Cooling Section) Supply Air Field Wiring Fan Optional Room Humidistat or Humidity Controller (Mounting and Wiring by Contractor) Sequence of Operation With unit disconnect switch closed, Microprocessor and ancillary components are energized. The "Power On" indicator light on unit annunciator will energize. Reactivation burner or electric heater firing rate is controlled via microprocessor controller as follows: With selector switch in “Manual” or “Auto” position, and safety circuits normal, supply fan operates continuously, and (optional) motorized outdoor air damper drives open. On a call for dehumidification, reactivation fan, desiccant rotor drive and reactivation burner are energized as required to maintain space humidity. The humidity set-point may be set internally via the RRC key pad or extenally via room humidistat. (The RRC must be confugured for internal or external set-point.” "Call for Dehumidification" light on unit annunciator will energize. 15 seconds after opening of main gas valve, the "Burner On" light on unit annunciator will energize. The firing rate is modulated as follows: (Optional) On units with modulating face and bypass rotor dampers, a modulating signal from a dehumidification controller signal modulates face and bypass dampers and energizes reactivation energy as required to satisfy the load. On units supplied without optional remote control panel, unit cycles in response to call for dehumidification from room humidistat exclusively. Reactivation burner ignition and flame management on gas fired units are controlled via a dedicated flame safeguard system and proven via flame rectification. Pre-ignition interlocks include reactivation airflow differential pressure proving switch, and manual reset high temperature limit switch. (1) Desiccant reactivation inlet temperature is maintained at optimum temperature for maximum dehumidification performance irrespective of outdoor temperature or filter loading. (2) As moisture load decreases, reactivation outlet temperature rises, and microprocessor controller resets reactivation inlet temperature down as required to limit reactivation outlet temperature. (Optional) Steam reactivation units use reactivation air volume rate modulation. Reactivation outlet temperature modulates reactivation airflow via variable frequency drive or (optional) modulating damper. Reactivation Inlet temperature is available for diagnostic information. Fail-Safe Mode: In order to preserve limited performance, in the event of a sensor failure, the microprocessor controller will deliver burner rate signal as follows: (1) With failed desiccant reactivation inlet sensor, burner output signal is 50%. (2) With failed reactivation outlet sensor, desiccant reactivation inlet is maintained at 260 degrees F. (3) With diminished reactivation airflow (I.e. dirty filters) desiccant reactivation inlet temperature is limited in order to prevent rotor overheat. (4) With overheat caused by an abnormal condition, a manual reset high temperature limit in desiccant reactivation inlet air stream cycles burner off. Dehumidification Reactivation Rate Control (RRC) G:\Engineering\Templates\Sequence of operations\DH,MDH,RRC,HCFB Controllers\ RRC-Face_bypass Carel Control Sequence 8x11 11-9-05.vsd 36 Unit shutdown occurs via the following: Desiccant rotor rotation is proven via roller switch input to the RRC controller. If rotation is not detected within programmed time, unit shutdown occurs. The "Rotation Fault" light on unit annunciator will energize. Adequate reactivation energy is proven via reactivation outlet temperature. If adequate leaving temperature is not sensed within the programmed time. The “Low Reactivation Temp” light on unit annunciator will energize. Unit will continue to run. Other customer or factory furnished devices may be installed to initiate unit shutdown via “External Faults” input. Unit shut-down occurs upon closing of customer contacts, or installed factory contacts, or loss of supply airflow. The “Other Faults” light on unit annunciator will energize. Flame failure via flame safeguard relay causes unit shut-down in the event of failure to ignite or maintain pilot flame. The “Flame Failure light on unit annunciator will energize. DH Series DH Series - SSCR Rotor Installation, Operation and Maintenance Manual Field Wiring Optional Remote Control Station (Mounting and Wiring by Contractor) Unit Control Panel with Terminal Strip Connections RRC HCFB Microprocessor Heating/Cooling Face & Bypass Controller Room Temperature and Humidity Transmitter MDH HCFB Post-Cooling Coil may be Chilled Water with Modulating Three-Way Mixing Valve or Dual-Circuit DX Sequence of Operation Heating-Cooling-Face & Bypass ("HCFB") Controller functions in concert with Reactivation Rate Controller (RRC) and (Optional) MDH controller to manage post- cooling and postheating modes of operation. With unit disconnect switch closed, Microprocessor and ancillary components are energized. (optional) "Power On" indicator light on (optional) remote control panel lights. With run command input and fault status normal, controller is enabled. Dehumidification: Humidity setpoint is adjusted via setpoint control knob on (optional) remote control panel, or as customer analog input. Space humidity is input via a room temperature and humidity transmitter or via customer furnished analog input. On projects requiring two controlled spaces, a second transmitter (optional) or customer input is required. When space humidity rises above setpoint via adjustment knob on (optional) remote control panel, analog output signal is sent to Reactivation Rate Control ("RRC"). When output signal achieves preset value, and safety circuits normal; supply fan, reactivation fan and reactivation burner are energized (See RRC sequence). (Optional) "Call for Dehumidification" light on (optional) remote control panel is energized. Unit furnished with (optional) Face and Bypass dehumidification modulation dampers receive output to modulate dampers as required to satisfy humidity setpoint. Units utilizing two space temperature and humidity signals operate until dehumidification of both spaces are satisfied. Post-Heat may be Indirect Fired (Atmospheric for 640 MBH and Below, and Power Burner style for above 640 MBH) or Hot Water Coil or Steam Coil with Face and Bypass Modulating Dampers Cooling: Heating: Temperature setpoint is adjusted via setpoint control knob on (optional) remote control panel, or as customer analog input. Temperature setpoint is adjusted via setpoint control knob on (optional) remote control panel, or as customer analog input. Space temperature is input via a room temperature and humidity transmitter or via customer furnished analog input. On projects requiring two controlled spaces, a second transmitter (optional) or customer input is required. When space temperature rises above setpoint, supply fan is energized. When dehumidification is energized, two stages of cooling are sequentially energized for customer use or for staged control of (optional) factory furnished DX condensing unit. A concurrent analog output signal is available for customer use or for modulating control of (optional) factory furnished modulating chilled water valve. When dehumidification is not energized, cooling is limited to first stage, and 50% of analog output. Units utilizing two space temperature and humidity signals operate until both spaces are satisfied. In the event of a conflict (one space calling for heating and one space calling for cooling) supply fan is energized and cooling and heating are disabled until both spaces are satisfied or a concurrent call for either heating or cooling exists in both spaces. Space temperature is input via a room temperature and humidity transmitter or via customer furnished analog input. On projects requiring two controlled spaces, a second transmitter (optional) or customer input is required. When space temperature falls below setpoint, supply fan is energized. When dehumidification is energized, one stage of heating is energized for customer use or for staged control of (optional) factory furnished heating unit. When dehumidification is not energized, second stage heating is available and a concurrent analog output signal is available for customer use or for modulating control of (optional) factory furnished heating unit. Units utilizing two space temperature and humidity signals operate until both spaces are satisfied. Units utilizing two space temperature and humidity signals operate until both spaces are satisfied. In the event of a conflict (one space calling for heating and one space calling for cooling) supply fan is energized and cooling and heating are disabled until both spaces are satisfied or a concurrent call for either heating or cooling exists in both spaces. Heating Cooling and Face & Bypass Management HCFB Control January 26, 2006 37 DH Series MDH Series MDH-CTR Series CDH Series CDH-F Series Concepts and Designs Inc. RRC MDH HCFB Unit Control Panel with Terminal Strip Connections Outdoor Air Automatic Damper MDH Microprocessor Ventilation Controller Outdoor Air To Desiccant Rotor Section Field Wiring Exhaust Fans Optional Remote Control Station (Mounting and Wiring by Contractor) Exhaust Air Recirculation Automatic Damper Return Air From Space Enthalpy Recovery Rotor Sequence of Operation "MDH" Controller functions in concert with Reactivation Rate Controller (RRC) and (Optional) Heating-Cooling-Face & Bypass (HCFB) controller to manage ventilation modes of operation. With unit disconnect switch closed, Microprocessor and ancillary components are energized. (optional) "Power On" indicator light on (optional) remote control panel lights. With run command input and fault status normal, controller is enabled. Airflow modes may include any or all of the following: With ventilation mode selector switch on (optional) remote control panel in the "unoccupied" position, and safety circuits normal; supply fan, reactivation fan and reactivation burner are energized as required to maintain space humidity (adjustable setpoint) via room humidistat (See RRC sequence). (Optional) "Call for Dehumidification" light on (optional) remote control panel is energized. Outdoor air damper is fully closed, and recirculation damper is fully open. With ventilation mode selector switch on (optional) remote control panel in the "low occupancy" position, and safety circuits normal; supply fan operates continuously, outdoor air damper drives 20% open and recirculation damper drives to 80% open. On a call for dehumidification, reactivation fan, desiccant rotor drive and reactivation burner are energized as required to maintain space humidity (adjustable setpoint) via room humidistat (See RRC sequence). (Optional) "Call for Dehumidification" light on (optional) remote control panel is energized. With ventilation mode selector switch on (optional) remote control panel in the "Full Occupancy" position, and safety circuits normal; supply fan operates continuously, outdoor air damper drives 50% open and recirculation damper drives to 50% open. Enthalpy rotor and exhaust fan 1 starts. On a call for dehumidification, reactivation fan, desiccant rotor drive and reactivation burner are energized as required to maintain space humidity (adjustable setpoint) via room humidistat (See RRC sequence). (Optional) "Call for Dehumidification" light on (optional) remote control panel is energized. With ventilation mode selector switch on (optional) remote control panel in the "Event" position, and safety circuits normal; supply fan operates continuously, outdoor air damper drives 100% open and recirculation damper drives fully closed. Enthalpy rotor and exhaust fans 1 and 2 start. On a call for dehumidification, reactivation fan, desiccant rotor drive and reactivation burner are energized as required to maintain space humidity (adjustable setpoint) via room humidistat (See RRC sequence). (Optional) "Call for Dehumidification" light on (optional) remote control panel is energized. Make Up Air Management MDH Control September 10 2002 38 With ventilation mode selector switch on (optional) remote control panel in the any position, and safety circuits normal, closure of an "Indoor Air Quality" contact from customer furnished or (optional) factory furnished air quality monitoring system; supply fan operates continuously, outdoor air damper drives 100% open and recirculation damper drives fully closed. Enthalpy rotor and exhaust fans 1 and 2 start. Units with (optional) supply fan variable frequency drive are commanded to maximum speed. On a call for dehumidification, reactivation fan, desiccant rotor drive and reactivation burner are energized as required to maintain space humidity (adjustable setpoint) via room humidistat (See RRC sequence). (Optional) "Call for Dehumidification" light on (optional) remote control panel is energized. On units supplied without optional remote control panel, unit airflow modes require customer furnished dry contacts for each mode. MDH-Series DH Series - SSCR Rotor Installation, Operation and Maintenance Manual Unit Control Panel with Terminal Strip Connections RRC MDH-CTR Outdoor Air Automatic Damper MDH-CTR Microprocessor Ventilation Controller Outdoor Air Field Wiring To Desiccant Rotor Section Optional Remote Control Station (Mounting and Wiring by Contractor) Return Air From Space Sequence of Operation With ventilation mode selector switch on (optional) remote control panel is in any position, and safety circuits normal, closure of an "Indoor Air Quality" contact from customer furnished or (optional) factory furnished air quality monitoring system; supply fan will operate continuously, outdoor air damper drives 100% open and recirculation damper drives fully closed. Units with (optional) supply fan variable frequency drive are commanded to maximum speed. On a call for dehumidification, reactivation fan, desiccant rotor drive and reactivation burner are energized as required to maintain space humidity (See RRC sequence). The "Call for Dehumidification" light on unit annunciator is energized. When the indoor air quality has been corrected and the Indoor Air Quality contact opens the unit returns to normal operation in unoccupied or low occupancy mode. The unit may also have a manual switch to place the unit into the IAQ mode. "MDH-CTR" option is integral to the RRC and functions in concert with Reactivation Rate Controller (RRC) to manage the ventilation option. With unit disconnect switch closed, Microprocessor and ancillary components are energized. The "Power On" indicator light on the unit annunciator will energize. With run command input and fault status normal, controller is enabled. Airflow modes may include any or all of the following: With ventilation mode selector switch on (optional) remote control panel in the "unoccupied" position, and safety circuits normal; supply fan, reactivation fan and reactivation burner are energized as required to maintain space humidity (See RRC sequence). The "Call for Dehumidification" light on unit annunciator will energize. Outdoor air damper is fully closed, and recirculation damper is fully open. On units supplied without optional remote control panel, unit airflow modes require customer furnished dry contacts for each mode. With ventilation mode selector switch on (optional) remote control panel in the "low occupancy" position, and safety circuits normal; supply fan operates continuously, outdoor air damper drives 20% open and recirculation damper drives to 80% open. On a call for dehumidification, reactivation fan, desiccant rotor drive and reactivation burner are energized as required to maintain space humidity (See RRC sequence). The "Call for Dehumidification" light on unit annunciator will energize. MDH-CTR Series Make Up Air Management MDH-CTR Control G:\Engineering\Templates\Sequence of operations\DH,MDH,RRC,HCFB Controllers\MDH CTR Carel sequence 8xll 11-9-05.vsd 39 Concepts and Designs Inc. 24. SHUTTING DOWN UNIT FOR EXTENDED PERIODS OF TIME F) Check blowers to make sure the shaft rotates freely, sheaves are aligned, sheaves, blowers, and motor bolts or set screws checked for tightness. When shutting down unit for extended periods of time we recommend that the following be done: G) Make sure all damper linkages are free to move, no binding will occur. A) Shut off main disconnect. H) Open main manual gas supply valve and check for leaks. B) Close main manual gas supply valve to prevent the leaking of gas into the combustion chamber. C) Cover reactivation air outlet. D) If the Unit electrical is subject to humidity you should remove the Flame Safety device and Carel controller to store them in a drier environment to prevent moisture from entering the devices and causing then to trip or fail on faults. 25. RESTARTING UNIT AFTER EXTENDED SHUT DOWN I) Turn on main disconnect. 26. SHUTTING DOWN THE BURNER IN AN EMERGENCY In Case of Emergency: A) Shut off the main power disconnect for the unit. B) Close main manual gas supply valve to the unit. When restarting the unit after long periods of shut down the following should be done: A) Check the unit for general cleanliness. Any debris small or large has been removed and the unit is clean. B) Reinstall the Flame Safety and Carel Controller into the unit. C) Make sure all wire terminals and connections have been checked for tightness. D) Check the supply air outlet and the blower inlets to insure they are free from any obstructions. E) Remove reactivation air outlet cover. 40 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual Rotor and Cassette Technical Information 41 Concepts and Designs Inc. 27. GENERAL ROTOR DO’S AND DON’TS When handling the rotor, please observe the following guidelines: A) DO NOT drop the rotor. Dropping the rotor may cause damage to the shell and the fluted desiccant media. B) DO NOT strike the surface of the rotor or allow any objects to strike the surface. C) DO NOT allow the surface of the rotor to become scratched. Use caution around the rotor when working with any tools that could cause scratches to the surface. D) DO NOT stand or place objects on the face of the rotor or rotor segments. E) DO NOT roll the rotor once it is outside the cassette or unit. F) DO NOT drag the rotor. G) DO NOT store the rotors on an inclined surface as this may cause them to tip over and damage the rotor or media. H) DO NOT allow dirt, dust, or debris to settle into the rotor element. Follow rotor washing instructions if the rotor has been subjected to long periods of storage in extreme conditions. I) DO NOT subject the rotor to vibration. J) DO NOT allow the rotor to come in contact with paint, oil, acids, etc. K) DO install the side with “F” printed on it toward the reactivation air in or “Hot” side, if so marked. L) DO secure the rotor using a method to prevent it from falling over or rolling. 42 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual difficult if not impossible to remove. This type of contamination can lead to a rapid deterioration of adsorption capacity. Filtration of both process and reactivation air steams is necessary to ensure longevity of performance. Experience has shown that the most dirt accumulation and resulting loss of performance are from poor filter maintenance. This is especially true on the reactivation side of the rotor as most attention is normally on the process air stream. The following list is representative of contaminants, which can adversely affect performance: 28. CHARACTERISTICS OF SILICA GEL DESICCANT MEDIA SGA desiccant media will retain 90% of it’s original capacity over a 10 year period (87,600 hrs) when operated in clean air. This reduction in capacity is due to natural aging of the desiccant and does not account for any contaminants, which are passed through the rotor during its lifetime. Dirt/dust Flour/sugar/powdery substances Greases/oils Hydrocarbons Alkaline detergents/cleaning compounds, etc. Acidic gases Chlorine Any high PH (8.0+) air stream Typically a 1000 ppm concentration is the upper threshold of exposure for gases. Any oils, greases, or high PH contaminants will immediately begin to affect performance. Deterioration of the desiccant media can occur from repeated exposure to water droplets, Accumulated dust and dirt simply covers and such as from condensate carryover. The mesometimes fills the pores of the desiccant. In dia tends to soften when soaked with water some cases this type contamination cases and structural integrity can be compromised. be blown out and/or washed from the media. Over time, water carryover can break down This normally results in a gradual, long-term the bond between the substrate and desiccant, decrease in performance. literally washing the desiccant from the media. Oils or greases in the air stream can rapidly deteriorate performance by masking the pores of the desiccant. Chemical contaminants tend to attack the structure of the desiccant and most times are The desiccant media can be washed 4-5 times before breakdown of the desiccant/substrate bond occurs. Acceptable PH range for washing of media is 1.5 to 7.5 PH. 43 Concepts and Designs Inc. 29. CHARACTERISTICS OF SSCR DESICCANT MEDIA 5. SSCR is not good at alkali environment. Please do not use under ammonia atmosphere. 1. In order to prevent any mist or dust intake, all air inlets should have mist separator 6. SSCR is not good at hot and wet condition. There will be possibility to loose its and dust filter. performance if exposed to hot water or hot steam. 2. SSCR is basically incombustible. However, it may cause of deterioration if SSCR is exposed to high temperature such like 180 C or higher. 7. Please do not keep SSCR in water or wet condition. It may cause deterioration. 3. Please be noted that strength of SSCR will 30. CHEMICAL COMPOUNDS get bad impact if water drops physically THAT MAY DAMAGE SSCR touches to element when it is dry. Please SILICA GEL HONEYCOMB maintain any water splash should be shut ROTOR off when pre-cooler coil is installed. As the following chemical compounds damage 4. SSCR is basically washable. However, the media of silica gel desiccant honeycomb please blow ambient air for more than rotor, the performance of the rotor is deterio30 minute until SSCR absorbed enough rated by them. moisture before rinsing. Otherwise, SSCR will get physical and chemical damages. Chemical Chemical Compounds Formula Cause of Damage (Deterioration) Oil Mist N/A Clog the micropore’s of the silica gel. Ammonia NH3 Though silica gel is strong against acid, Amine RNH2 ammonia or amine may crack the silica gel. Hydrogen Fluoride HF Corode Silica gel. Sodium Hydroxide (High Concentrate) NaOH Corode Silica gel. Potassium Hydroxide (High Concentrate) KOH Corode Silica gel. Lithium Chloride LiCI Decrease Adsorption capacity of silica gel. Sodium Chloride NaCI Decrease Adsorption capacity of silica gel. Potassium Chloride KCI Decrease Adsorption capacity of silica gel. Calcium Chloride CaCI Decrease Adsorption capacity of silica gel. Magnesium Chloride MgCi Decrease Adsorption capacity of silica gel. Aluminum Chloride AICI3 Decrease Adsorption capacity of silica gel. Sea Water N/A Decrease Adsorption capacity of silica gel. Strong Acid (pH = 3 or lower) N/A Deteriorate the physical property of ceramic substrate. Plasticizer N/A Clog the micropore of silica gel. High Temperature Steam N/A Corrode silica gel if content of alkali exists. 44 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual 31. PRINCIPLE OF OPERATION 32. DH ROTORS & CASSETTES The function of the Dehumidification Rotor and Cassette is to remove moisture (in the vapor state) from an air stream. This is accomplished by exposing the air to an adsorbing media (desiccant) in a sealed air stream (process). After the desiccant has absorbed moisture, it is exposed to a second air stream at an elevated temperature (reactivation). This causes the moisture to be driven out of the desiccant preparing it for more moisture adsorption. This process is done on a continuous basis, providing a constant drying process. SPECIFICATIONS The two air streams (process and reactivation) are separated by seals, which contact the desiccant media. The figure below illustrates the airflow relationship of the seals and airflow pattern. The Dehumidification Rotor and Cassette is designed with the two air streams flowing in opposite directions (counter flow) thereby maximizing the energy efficiency of the equipment. Desiccant Rotor shall be provided by Concepts and Designs Inc. and shall conform to the following specifications: Media shall be uniform in nature, comprised of corrugated fiberglass with an “in situation” formed silica gel desiccant. Corrugations shall be 0.059” tall by 0.118” wide, with a wall thickness of 0.007” + 0.001”. Media shall be nominally 16 lbs per cubic foot with “dry” (reactivated) desiccant concentration of not less than 80% of the total media mass. Not more than 4% of the media, including face coat, shall be of an organic material. Rotor media must withstand temperatures to 2000 FDB without mechanical failure. Rotor media shall be independently tested in accordance with ASHRAE guidelines for performance and independently tested in accordance with ASTM E-84 for flame resistance and smoke production. ASTM E-84 result must be 0/0 for both flame and smoke rounded indexes. 45 Concepts and Designs Inc. Independent test results must be furnished by Concepts and Designs Inc. at the factory. the manufacturer upon request. Rotor Frame shall be comprised of thick wall “DOM” carbon steel tubing, with welded 10 gage spokes and welded internal 10 gage media retention strips. Spoke ends shall terminate with welded heavy duty coupling nuts for bolt attachment of outer rim. Outer rim shall be manufactured from not less than 14 gage 304 stainless steel. When applicable, 14 gage minimum 304 SS flanges shall be stitch welded to the outer rim on 4” centers. Flanges shall be additionally sealed to the outer rim using 400 FDB rated silicone sealant. Rotor Frame shall include 200,000 hour rated, no maintenance, sealed bearings. (Optional full stainless steel construction). Rotor Drive shall include a parallel shaft gear reducer with hardened steel gears and drive motor suitable for both 50 and 60 Hz operation. Cast aluminum motor gear case shall be permanently lubricated. Gear Reducer drive shall be equipped with a #40 chain hardened carbon steel ANSI drive sprocket, nickel plated corrosion resistant drive chain and spring type automatic chain tensioner. Desiccant Rotor Cassette shall be provided by Concepts and Designs, MS. and shall conform to the following specifications: Cassette Frame shall be manufactured from welded 304 stainless steel tubing. All welds shall be reasonably ground and dressed for appearance. Structural welds shall be continuous and non-structural welds shall be on 4” centers. Cassette face panels shall be 304 stainless steel and welded in place. Cassette seal guides shall be of 304 stainless steel and shall be welded in place. Cassette motor drive base plate shall be of 304 stainless steel and shall be welded in place with welded threaded nuts on the base underside to allow for ease of drive motor removal and installation. Rotor shaft shall be manufactured from 4140 Cold Rolled steel and shall be bolted to the cassette via oversized allen head socket type shoulder screws. Rotor movement on the drive shaft shall be prevented by the use of two (2) square collar blocks with stops. Rotor Seals shall be of an Extruded rubber silicone on both circumferential and divider portions. Rotor seals shall be self-adjustable. Rotor seals shall be readily available from 46 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual 33. OPERATION Drive System Operation In the picture on the previous page, the drive system operates as follows: With 115v power applied to the drive motor, the drive sprocket rotates and pulls on the drive chain. The drive chain engages the perimeter rotor sprocket (seen more clearly on page 29 of this manual), which in turn, rotates the SGA rotor. The Drive motor and sprocket are mounted on a metal hinged plate with tension springs that are held in place with a welded rod. The purpose of the tensioner is to remove slack from the drive system, so as to prevent unnecessary wear on drive parts to reduce wear and improve system reliability. Measurement of Performance Refer to the schematic in Figure 33.2 for location of readings. At each of the following locations, perform measurement of Dry Bulb Temperature, Dew point and air volume flow: 1. Entering Process Inlet, Leaving Process Outlet 2. Entering Reactivation Inlet, Leaving Reactivation Outlet Additionally, measure dry bulb temperature at the reactivation heater outlet, and time rotor speed of rotation. Lastly, measure process and reactivation air pressure drop and drive motor amperage. Compare all measurements against the performance graphs. Results should agree within a few percent (likely measurement error) of graph and software performance readings. In the event of substantial (>5%) difference between measured and predicted results, reperform measurements. Note that common measurement and calculation errors are: Figure 33.2 A) Process Leaving dew point is inaccurately determined by measuring wet bulb (or RH) and calculating dew point. In many cases, the leaving process air is so dry that even slight measurement errors in dew point (or RH) will have significant results. If possible use a chilled mirror dew point sensor for all dew point readings B) Turbulence in air streams causes variance in all readings. Take an average reading in a transverse across the face of the rotor in order to minimize variance due to turbulence. C) Heat and mass transferred do not balance. The amount of heat gain in BTUH on the process side must match the heat loss in BTUH on the reactivation side. Also, the amount of moisture removed on the process side must match the amount of moisture gained on the reactivation side. If mass and heat transfer do balance, it is likely that the readings obtained are correct. Refer to the troubleshooting section of this manual for additional actions. 47 Concepts and Designs Inc. MAINTENANCE OF THE ROTOR in the unit (as per the picture below) while holding the nozzle about 1” from the face of the rotor and having other personnel simultaneously vacuum the opposite side of the rotor to catch dust and debris. A standard shop vacuum, equipped with a rubber hose adapter is typical (be sure not to scratch or damage the face of the rotor). Remember that the air nozzle that is admitting the 100 PSI air should never come closer than 1” to the face of the rotor. Be careful not to damage the rotor face with extreme air pressure or with the metal body of the air nozzle. Clean a small area of the rotor at a time (generally a 6” x 6” area) for best results. Be sure to adhere to the appropriate confined space entry requirements (as applicable) when entering the air handler. 34. ROTOR CLEANING Periodically, the rotor may need cleaning from accumulated dust and debris or if the efficiency of the rotor decreases. Generally, air handlers are equipped with air pressure drop monitoring devices, which indicate pressure drop through the rotor. If the air pressure drop exceeds 125% of the “new” pressure drop, the rotor should be cleaned by the following method: A) With the air handler shut down and the power locked out, clean & dry 100 psi air should be directed into the rotor in the opposite direction of the process air flow 48 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual 35. ROTOR CORE SAMPLES Rotor Core Sample procedure is as follows: Under most conditions the dehumidification rotor and cassette is rated for 87,600 hours of continuous operation. The operating lifetime of the unit is determined at the percentage of moisture removal performance at a given time versus the original, new, moisture removal performance. When the performance drops to 90% +0% -5% of original, the rotor is generally considered at the end of its use. If the rotor performs at this reduced level substantially in advance of the rated lifetime, a standard procedure is to perform a rotor core sample. At an estimated cost to you Concepts and Designs, Inc. will have the sample evaluated and provide results of the evaluation. The evaluation is to determine if the moisture adsorption effectiveness in the desiccant material has been affected during use. Common factors that can reduce the effectiveness of the desiccant media are: A) Grind the edge of a 12” long by approximate 2” Inside diameter thin wall copper tube or conventional hard conduit as per the sketch below. B) After securing the air handler, and observing applicable safety requirements, gently tap and turn the sharpened edge through the desiccant media. A) Exposure to acidic air streams, gases or solutions B) Exposure to petroleum products such as oil mists C) Exposure to organic dusts such as sugar, flour, etc. D) High concentrations of other hydrocarbon based airborne pollutants If the core sample test determines that the surface of the rotor has been contaminated, the factory may recommend either solvent cleaning or rotor replacement. C) Firmly turn the tube and withdraw from media. A plug of media should be retained within the tube. D) Mark the sampling tube with the Return Air Inlet and Process Air Outlet end of the sample taken. E) Ship the tube, with the sample inside, to the factory at: 2100 Park Drive, Owatonna, MN 55060 with a letter regarding details, Serial number, etc. F) Fill the hole with a plug with 400°F rated silicone sealant. Allow sufficient time for the sealant to cure. (A plug can be purchased from Concepts and Designs, Inc.) G) The surface of the media plug silicone filler should be flush with the media surface. Trim away excess as necessary. H) Return the air handler to service. I) Normal lead time for sample results are six (6) to ten (10) weeks. Concepts and Designs, Inc. will contact the address information/ personnel submitted with the sample and will provide a written report. 49 Concepts and Designs Inc. 36. DESICCANT ROTOR REPAIR Minor repairs, such as rotor cracks, separations or dents can be preformed by service technicians when required. Materials needed include: Masking tape Small piece of stiff cardboard with flat edge 100% silicone RTV with a minimum temperature rating of 350-450°F Caulking gun A) Position the rotor so you have unobstructed access to the cracked or damaged portion of the rotor. B)Turn the unit OFF and disconnect the power. Remove the service panels to the unit. C)Apply masking tape to the face of the rotor on the right and left sides of the crack. Allow for about two “corrugations” on each side of the crack. D)Apply 100% silicone with a minimum temperature rating of 350-450°F to the crack, keeping the angled cut of the silicone tube parallel and very close to the surface of the rotor to ensure good penetration. For best results, apply the silicone in an upward motion to push the silicone into the crack. E)After applying the silicone, take the piece of cardboard, and at a 45° angle, drag the cardboard over the bead to press the silicone into the crack and make the surface of the silicone smooth and flush with the face of the rotor. This will further enhance the penetration of the silicone and will ensure that the silicone does not protrude above the surface of the rotor. F)Immediately after pressing the silicone into the crack with the cardboard, remove the masking tape. This must be done before the silicone starts to cure, or “skin over”. G)Allow the silicone to fully cure prior to running the unit. Should any questions or problems arise, contact Concepts & Designs (507) 451-2198. 50 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual 37. ROTOR REMOVAL AND REPLACEMENT In the event that the rotor needs to be removed for maintenance, cleaning or replacement, follow the steps and photographs on the following pages. Exercise care when removing the rotor so as not to damage rotor, shaft, cassette or seals. Observe applicable safety practices regarding heavy material handling when following the removal or reinstallation procedure. A) Secure the air handler and observe applicable safety precautions regarding confined space entry and electrical tag out. B) Determine if the rotor will be removed from the drive side of the cassette (requires drive system removal) or the opposite side of the cassette. If the rotor is to be removed from the drive side of the cassette, disassemble the drive system as follows: 1) Unbolt the tensioner bolts. Exercise caution as the tensioner is under tension at the time of removal. 2) Remove the locking clips from the chain drive master link. Separate chain and remove chain 3) Electrically disconnect drive motor and remove the four (4) bolts which secure the drive motor to the cassette. The motor and bracket should be removed. C) Once the drive system is disassembled and removed, or if removing the rotor from the side of the cassette opposite the drive, support the rotor with a ratchet strap of appropriate capacity per the picture below. Do not over tighten the strap at this time as it is just being used to gently support the Rotor. D) At the center shaft of the rotor (per the photo below) loosen the shaft locking collar on both sides of the rotor. Next, loosen and remove both shaft end bolts. Be sure that the ratchet strap is tightened as necessary to support the rotor when removing the shaft end bolts. E) After removing both shaft end bolts, carefully loosen the ratchet strap and allow the rotor to gently slide to the bottom of the cassette. Slide the shaft and shaft lock- 51 Concepts and Designs Inc. C) Using pliers, grab seal and pull firmly. The seal is adhered in place using Degree Fahrenheit dry bulb rated silicone sealant. This adhesive will allow the seal to be removed with moderate hand pressure. Remove all seals which require replacement. D) Clean all silicone residue from the cassette using acetone or other approved solvent cleaner. You could also use a wire brush attached to a drill motor. It is essential to remove all residue and debris prior to installing new seals. E) New seal should be cleaned with acetone prior to installation and handled with clean hands. ing collars out of the rotor. Disconnect the ratchet strap from around the cassette, and reroute the top of the strap over the rotor, but below the cassette top. F) Using the strap by holding both ends, gently pull the rotor out of the cassette. G) Replace the rotor using the reverse procedure. 38. SEAL REPLACEMENT During the lifetime of the rotor, seal replacement may be required as outlined in the troubleshooting section. If the seal surface is damaged, or it is determined that the seals should be replaced, replace the seals (refer to photograph on the previous page) as follows: A) Secure and lock out the air handler per approved safety procedures. B) Follow the steps for rotor removal on Previous page. F) Allow seals to dry overnight. G) Carefully install rotor using the reverse procedure to remove the rotor. 39. DRIVE SYSTEM PARTS REPLACEMENT Under normal conditions, all drive system parts should last the lifetime of the cassette. Under extreme conditions, drive system parts may require replacement. Replace drive system. 40. ROTOR ALIGNMENT INSPECTION Desiccant dehumidification cassettes are shipped fully assembled from Supplier, including dehumidification rotor, seals and drive system. The rotor and drive system should be carefully aligned within the cassette frame. The rotor is supported by a central shaft and shaft bolts which pass through a clearance hole in the vertical center support member of the cassette frame. Alignment of the rotor is maintained by the rotor shaft 52 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual position (vertical and horizontal) within the cassette. This position may be adjusted by loosening the shaft bolts, aligning the rotor to its desired position within the cassette frame, and retightening the shaft bolts. Small wooden wedges, inserted between the rotor perimeter and rotor seal are sufficient to align the rotor to the desired position. may also use a wood block and a length of 2 x 4 to leverage the rotor up on one side or the other from the bottom. Position the rotor such that equal gaps exist between the rotor flange and cassette panel wall. After adjustments have been made and center shaft bolts have been retightened, operate the drive to ensure that the gap is consistent during rotation. Should rotor or sprocket miss-alignment be evident the following procedures apply to troubleshooting and correcting the alignment. Please note that this rotor alignment must be correct prior to attempting any adjustment to the factory location of the perimeter sprocket mounted on the outer band of the dehumidification rotor. 4. If run out is evident (change of gap spacing during rotation) verify if the rotor band or flange is causing the variation. The band position would indicate the amount of run out, the flange position can be adjusted perpendicular to the band manually with a slotted tool, at the thickness and width of the flange. 1. Check to verify whether or not the rotor is improperly aligned within the framework of the cassette by checking the gap inbetween the rotor flange and cassette panel walls where the perimeter seals are attached. Misalignment of the rotor will be evident by a smaller gap at one point on the rim of the rotor from the other on the opposite end. This may be witnessed in a vertical or horizontal plane. If an adjustment is made in the position of the rotor within the frame, the location/ alignment of the perimeter sprocket must be checked in relationship to the cassette panels and drive sprocket. If adjustment is necessary, the following procedures apply: 1. Operate the drive system and check the position of the perimeter sprocket in relationship to the drive sprocket at a fixed spot on the cassette frame. The perimeter sprocket should track with a consistent gap between the frame. To adjust position, it will be necessary to loosen or possibly remove the attachment screws holding the sprocket to the rotor band. 2. Connect the correct voltage to the motor (refer to nameplate on the rotor drive motor) and operate the drive system to verify that the gap is consistent and stays in the same location during rotation. If the gap is consistent, misalignment is the cause. If the gap changes during rotation, it may be run out of the rotor around the central axis or a run out of the perimeter flange of the rotor. 2. Move the perimeter sprocket left or right as required to establish the proper gap and re-secure with the attachment screws. Repeat this process as required to establish a consistent gap and alignment with the drive sprocket. A minimum of two to four attachment screws per bracket are required to properly secure the sprocket. 3. If the misalignment is to be corrected: Correct the misalignment by loosening the center shaft bolts and adjusting the rotor position within the cassette. Small wooden wedges, inserted between the rotor perimeter and rotor seal are sufficient to align the rotor to the desired position. You Upon completion of the perimeter sprocket alignment, the drive chain and sprocket 53 Concepts and Designs Inc. engagements should be smooth with consistent vertical chain alignment. Some vibration of the A) Material will not fail due to exposure of rotor may be evident from friction generated by saturated (100% relative humidity) air the perimeter seals. This should be mild and streams. will not affect the operation of the drive system. The dividing seals separating the reactivation B) If installed and operated in accordance area should also be checked to ensure proper with the manufacturer’s instructions, contact with the face of the rotor. Normally the media shall perform as per data pubgap between the rotor face and seal mounting lished by the manufacturer. angle should be approximately three quarters of an inch. Additional Components such as rotor bearings, seals, belts, chains, sprockets, drive motors and controls (as applicable) are war41. LIMITED ROTOR WARRANTY ranted for a period of Eighteen (18) months Concepts and Designs, Inc. (hereafter referred from the date of shipment, and are specifically to as CDI) warrants to the original Purchaser warranted, in addition to being free of defects of its Desiccant Dehumidification & Energy in material and workmanship, for the following: Recovery Rotors and Cassettes (“Products”), A) Equipment shall not fail due to insufsubject to the enclosed exclusions and conficient torque and or duty for selected ditions, that the Products will be free from application. defects in materials and workmanship as described herein. B) Material shall not wear to the point of failure, within the period, from normal Rotor and Cassette metallic structure, includoperating stresses. ing hub, shaft, spokes, perimeter band, cassette sheet metal and tubing structures (as applicable) are warranted for a period of eighteen CDI’s sole obligation under this Limited War(18) months from the date of shipment, and ranty, is to repair or replace, at its option, free are specifically warranted, in addition to being of charge to the original purchaser (except free of defects in material and workmanship, as noted), F.O.B. CDI’s factory, any Product determined by CDI (in its sole discretion) to for the following: be defective. A) Structures including welds and base materials shall not fail due to corro- CDI’s Limited Warranty excludes defects, failsion from normal ambient sources ures and reduced performance caused, either (corrosive industrial environments are directly or indirectly, by improper installation, abuse, misuse, misapplication, improper mainexcluded). tenance, lack of maintenance, negligence, B) Structures shall not fail due to normal accident or normal deterioration, including operating pressures and subsequent wear and tear. developed stresses. This Limited Warranty additionally shall not Media and Substrate are warranted for a pe- apply to failures, defects or reduced perforriod of eighteen (18) months from the date of mance, resulting either directly or indirectly, shipment, and are specifically warranted, in from any use or purpose other than desiccant addition to being free of defects in material dehumidification and or energy recovery (as applicable), or from exposure to corrosive enand workmanship, for the following: 54 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual vironments (liquid or gaseous) or liquid water, in the form of impingement from a moving air stream. This limited Warranty additionally excludes damages due to natural disasters and Force Majure. This Limited Warranty does not include costs for transportation (including without limitation, freight and return freight charges, costs and insurance), cost from removal or reinstallation of parts or equipment, Premiums for overtime, or labor for performing repairs or replacement to equipment in the field. CDI is not responsible for damages during transport of any product to or from CDI. 42. SAFETY HANDLING SGA ROTORS & CASSETTES THE OBLIGATION AND LIABILITY OF THE CDI UNDER THIS LIMITED WARRANTY DOES NOT INCLUDE LOSSES, DIRECT OR INDIRECT, FOR INCIDENTAL, SPECULATIVE, INDIRECT, OR CONSEQUENTIAL DAMAGES, RESPECTIVE OF THE FORESEEABILITY OF ANY SUCH DAMAGES. THIS LIMITED WARRANTY IS PROVIDED EXCLUSIVELY TO THE ORIGINAL PURCHASER OF PRODUCTS AND MAY NOT BE TRANSFERRED OR ASSIGNED WITHOUT THE EXPRESS WRITTEN CONSENT OF CDI THIS LIMITED WARRANTY IS IN LIEU OF, AND CDI HEREBY EXPRESSLY DISCLAIMS, ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND THERE ARE NO WARRANTIES WHICH EXTEND BEYOND THE DESCRIPTION ON THE FACE HEREOF. In no event shall CDI liability to Purchaser hereunder, or in any respect of the transactions contemplated hereby, whether direct or indirect, exceed the amount paid by the Purchaser in respect of the products from which any such liability is said to arise. Concepts and Designs inc. Rotors and cassettes are shipped in plywood containers. Upon receipt, carefully unpack the rotor (and or cassette) and inspect for damage. (If the is visible damage seen on the outside of the shipping container, please make sure to note that on the truck driver’s waybill. If you find any interior damage after opening the container, please notify the Customer Service department at Concepts and Designs Inc. 507-4512198). The rotor should remain in the packing crate as much as possible until ready to install, after removing from the crate the rotor should be keep in the upright position as much as possible. Rotors should not be handled by rolling (except for short distances only) or by placing sling around the entire perimeter of the rotor and hauling with lift truck or crane. If possible, a customer supplied shaft (rotor only) placed through the bearings on the rotor should be used to support the rotor. As always, follow all applicable safety precautions when handling rotors and cassettes. Concepts and Designs Inc. Cassettes may be lifted by any part of the perimeter structural framework, and are designed to support the weight of their own structure, the desiccant rotor and drive. When installed in air handlers, cassettes should not be used to support other structure within the air handler. Exercise caution when handling rotors and cassettes to prevent damage to the face of the rotor media, seals and drive systems. Also refer to the section on the “General Rotor do’s and don’ts” of handling the rotor. 55 Concepts and Designs Inc. Maintenance 43. MAINTENANCE SCHEDULE Preventive maintenance is the best way to avoid unnecessary expense and inconvenience. Have this system inspected at regular intervals by a qualified service technician. The required frequency of inspections depends on the total operating time and the indoor and outdoor environmental conditions. Routine maintenance should cover but not limited to the following items: EVERY MONTH AIR FILTERS: Check for cleanliness and replace if necessary Directions for the replacing of filters: Replace only with filters designed for a minimum airflow of 500 FPM. Replace only with the quantity and sizes stated on the unit nameplate or per the unit drawing. Filters may need to replace more often or less often if the air quality conditions around the unit dictate so. BLOWER BEARINGS: CONDENSATE DRAIN P-TRAP: Lubricate with grease. (Some blowers with direct drive fan motors may have sealed bearings) When grease is needed a high grade ball or roller bearing grease should be used. Recommended grease for standard service conditions is Polyrex EM (Exxon Mobil). Equivalent and compatible greases include: Texaco Polystar, Rykon Premium #2, Pennzoil Pen 2 Lube and Chevron SRI. (Do Not Over Lubricate) (If Applicable) Check the condensate P-trap drain for proper seal or blockage, clean and add water or oil as necessary. EVERY 3 MONTHS BLOWER V‑BELTS: (If Applicable) Check for belt wear, belt tension, belt alignment. ROTOR CHAIN: Check for chain wear, chain tension, chain alignment (Lubricate with chain lube if necessary). ROTOR ROTATION LIMIT SWITCH: Check control to insure operation (Make sure switch is closing when it comes in contact with the cam or magnetic sensor). 56 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual EVERY 6 MONTHS BLOWER FAN: PILOT ASSEMBLY (IF APPLICABLE): DESICCANT ROTOR: Check sheave alignment, lubricate bearings (manufacturer’s grease specifications and lubrication procedure enclosed, Do Not Over Lubricate) Inspect and clean pilot assembly if necessary, check spark electrode flame rod and/or UV site glass (Site glass must be cleaned with soft tissue). Examine desiccant media and sector seals for physical damage and cleanliness. (Clean with 100 PSI air if necessary – refer to Rotor Cleaning Section of Manual). COILS (IF APPLICABLE): Inspect coil fins for damage. (straighten with coil comb if necessary) Inspect coil fins and tubes for buildup of debris clean coil if necessary. CONDENSATE DRAIN PAN: Check to see if there are any leaks in the coils, repair or replace as necessary. (If Applicable) Check Condensate drain pan for cleanliness, clean if necessary. ONCE A YEAR ELECTRICAL COMPONENTS: BURNER (IF APPLICABLE): Turn the Main disconnect switch off and then open the electrical panel door. Make sure all controls are clean and free from dust and grease. Inspect for loose wires and terminals (Tighten as necessary). Check and clean relay and starter contacts. (Use compressed air to blow all debris from components and clean up cabinet. Check for any rust accumulation in burner orifices (Clean as necessary making sure not to use a tool that will make the holes larger). Inspect the burner looking for any cracks or distortion in the burner baffle plates. 57 Concepts and Designs Inc. BURNER -Continued (IF APPLICABLE): Clean the burner with compressed air and follow with a clean rag to remove any debris. Check gas supply pressure to insure that the pressure matches the Name Plate. Check to make sure you have a good pilot flame. Check burner operation to make sure it modulates properly. Inspect the gas train and check for any gas leaks. ELECTRIC HEATER (IF APPLICABLE): Inspect the wiring leading to the electric heaters for cracks, frays or melted wire coating or shielding. (Replace as necessary) Inspect the ceramic insulators for cracks (replace as necessary). Check for any broken heater wires (replace as necessary). Inspect the electric heater terminals for tightness. (Be sure not to over tighten them as this may crack the ceramic insulators). DESICCANT ROTOR: Measure process and reactivation differential pressure against the specified values on unit Name Plate. (Clean with 100 PSI air if necessary – refer to Rotor Cleaning Section of Manual). FIVE YEAR INTERVAL DESICCANT ROTOR: Thoroughly examine rotor and inspect for damage. If rotor face is damaged repair or replace rotor. (Refer to “Desiccant Rotor Repair” under the Maintenance Of The Rotor section) Examine sector seals for wear, and replace if required. If pressure drop is > 1.25 x new, clean and or replace rotor. The above is only a suggested maintenance schedule for the unit. If you have any questions please contact the Customer Service Department at Concepts and Designs Inc. by phone at 507-451-2198 or by Email at “[email protected]” 58 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual 44. BASIC ACCESS DOOR FOAM GASKET REPLACEMENT When the door gasket on your unit gets damaged or worn out and needs to be replaced, the following are instructions on how to replace the foam gasket on the door. (You can purchase this material by calling the Customer Service Department at Concepts and Designs Inc. 507-451-2198.) 1. Remove The Old Gasket. B. Cut away the “barb” on the underside of the gasket approximately 1/8” back from the cut end. (Refer to drawing Below) Using fingers or pliers, grasp the old gasket at a point near the center of any horizontal or vertical frame component, and pull straight out of the frame, working from the center toward the corners. Repeat on each of the four sides of the gasket. Note: In the event that the gasket separates during removal, any material that tears C. At a point approximately 6” from either off and remains in the frame channel corner on the latch side of the door frame, must be removed before the new gasstart pressing the new gasket into the ket is installed. This can be done by channel in the frame. As you proceed with lifting one end out of the groove using the gasket replacement, make sure that a knife tip or small, flat tip screwdriver, the gasket is fully seated along its entire then pulling the material straight out of length. (Refer to drawing Below) the groove. 2. Remove Any Sealant. It is necessary to clean up any excess factoryapplied corner sealant that might prevent the new gasket from laying flat on the frame. Use a flat, rigid object such as a putty knife to scrape the surface of the frame where the new gasket will rest. Also remove as much sealant as possible from inside the groove so that the new gasket will seat properly. 3. Install The New Gasket. A. If necessary, recut the end of the replacement gasket with a sharp knife or scissors so that the starting end is clean and cut to approximately 30o. (Refer to drawing Above Right) FOAM GASKET BUTT JOINT LOCATION 59 Concepts and Designs Inc. D. Stop before you reach each corner (approximately 12” from the corner) and use a pen to mark, on the top surface of the gasket, the point where it will make a 90o bend. At that mark, make a 80o notch through approximately 2/3 of the width of the gasket, and then carefully cut away the “barb” on the underside approximately ½” (6mm) from each side of the notch. (Refer to drawing “But Joint Angle and Overlap Conditions” Below) E. Continue the installation process around CORNER CUT FABRICATION G. Apply a small amount of flexible sealant into the gasket channel at the point where the two ends will meet, and complete the installation. (If you did not purchas the sealant with the door gasket contact the Customer Service department @ Concepts and Designs Inc. 507-451-2198 for information as to the proper type of sealant to use) BUT JOINT ANGLE AND 4. Seal Under The Gasket Corners. the corner, and proceed to the 2nd, 3rd, Force a small amount of flexible sealant or and 4th corners, repeating the process in contact cement under the gasket at each corner where the barbs were cut back. This step “C.” on the previous page. will prevent air leakage under the gasket at F. As you approach the start point, make those points. a mark on the top surface of the gasket where it will meet the starting end. Cut the gasket with a sharp knife or scissors so that the end is clean and matches the angle in step (a), above, and overlaps slightly. (Refer to “Corner Cut Fabrication” Drawing Below) Cut away the “barb” on the underside approximately 1/8” back from the cut end. 5. Readjust The Latches. Adjust the door handle latches so that the door bottoms out firmly against the stop-leg of the door frame. 6. Repeat These steps for any door gasket that may need repairing. 60 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual CDI STANDARD WARRANTY AND LIMITATION OF REMEDIES FOR BREACH OF WARRANTY Concepts and Designs, Inc. (hereafter referred to as CDI) warrants all products to be free from defects in workmanship and material under normal usage for a period of twelve (12) months from date of factory documented startup or eighteen (18) months from the date of original factory shipment, which ever is shorter. CDI shall only be liable under this warranty if the product is properly installed and used according to the directions furnished by CDI. The Basic Product Warranty is a “Parts Only” warranty and CDI’s obligation shall be limited to the replacement of new parts of the products for those returned to CDI’s factory at the purchaser’s expense and found to be defective by CDI. CDI will then repair or replace, at its option any such part determined to be defective during this warranty period. Replacement parts will be shipped F.O.B. CDI’s factory. CDI is not responsible for damages during transport of any product to or from CDI. Replacement of parts shall not extend the original warranty period of the original total product, including any replacement parts supplied. This Standard warranty does not cover corrosion; normal deterioration; misapplication; labor charges paid for parts replacement, adjustments, repairs or other work; loss of refrigerant or natural gas, oil, or other fuel; components supplied by others; defects in parts resulting from neglect, negligence, accident, fire, explosion, high or low voltage, jumpering or jamming controls, shorting out of components; improper or contaminated fuel, excessive or inadequate fuel pressure; frozen heating or cooling coils; or any acts of nature. This warranty does not cover failure of the purchaser or end user to follow the recommended maintenance schedule intervals and failure to perform such items as bearing lubrication, adjustments, cleaning or service on the heating system; or improper repairs or alterations; or misapplication of the equipment. Any component of the unit found not working at the original startup of the unit (DOA) shall be replaced with no reasonable labor or freight expenses to the owner or installing contractor. After the initial startup the warranty shall be limited to the original cost of the component. Expenses shall not be charged at more than what is considered a reasonable negotiated rate between CDI and the installing contractor doing the work. This DOA warranty does not cover corrosion; normal deterioration; misapplication; loss of refrigerant, natural gas, oil, or other fuel; components supplied by others; defects in parts resulting from neglect, negligence, accident, fire, explosion, high or low voltage, jumpering or jamming controls, shorting out of components; improper or contaminated fuel, excessive or inadequate fuel pressure; frozen steam, heating or cooling coils; or any acts of nature. It is expressly understood that this warranty is made IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, WHETHER ARISING FROM STATUTE, COMMON LAW, CUSTOM, OR OTHERWISE, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ANY PARTICULAR PURPOSE, QUALITY, DESIGN, CONDITION, DURABILITY OR SUITABILITY, and in consideration of the express warranty herein contained, BUYER EXPRESSLY WAIVES ANY RIGHT TO CLAIM OTHER WARRANTIES, EXPRESSED OR IMPLIED. It is further understood that CDI’s liability for breach of warranty shall be limited to terms of this warranty and buyer agrees that CDI SHALL NOT, IN ANY EVENT, BE LIABLE FOR SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES, OR DELAY. The buyer’s remedies are exclusive, and shall be limited to those provided herein. CDI neither assumes and does not authorize any person to assume any obligation or warranty other than those stated herein. Any suggestion to the contrary not withstanding, CDI shall not, in any event, have any liability under this warranty unless and until it has been paid in full for the products. The warranty period shall begin as described above, whether or not payment has been made. 61 Concepts and Designs Inc. WARRANTY CLAIMS Defective material may be repaired or replaced at our option. If replaced, full credit will be issued in the amount of the original purchase price if returned within 30 Days of shipment, for the returned material; in the event the material is found to be not defective, or to be damaged or abused, we reserve the right to return the material “as is” to the sender and at his freight cost. If CDI agrees to keep such material, credit will be issued minus the cost of repair and reconditioning, the return and less restocking charges. Other wise only cost of the part will be covered by our warranty. But if the part(s) CDI has sent are not the problem please reinstall the old part and return within 30 Days of shipment the new unused part back to CDI, we will then after inspecting the part to insure it is still in good working order will return the new unused part(s) to inventory and issue credit. Old parts returned to us that are in good working condition or after the 30 Day period will be charged to you and not covered by warranty. It is important to remember that in order for our warranty to cover the cost of the new part you must return the faulty part to us within 30 days to receive credit. Then after CDI receives the part we must confirm that the returned part is actually faulty before issuing credit. When returning the faulty part, please reference the Return Merchandise Authorization Number (Known as the RMA number). Also please provide a small description as to what is wrong with the part that is being returned under warranty: Reminder: Our warranty only covers the cost of the faulty part and must be returned within 30 days from the time of shipment from the factory to receive credit. You are responsible for any other expenses you incur, including freight charges, miscellaneous parts and the labor to install the part(s). Warranty does not cover the following Items: 1. A maintenance item such as fuses, lamps, filters, etc. 2. Normal wear, adjustments, and periodic service. 3. Damage caused by accidents, improper installation or handling, or faulty repairs not performed by an authorized service representative. 4. Damage caused by operation of the unit at improper voltage loads, conditions, modifications, or installation contrary to published specifications or recommendations. 5. Damage caused by negligent maintenance such as: a. Failure to keep the air inlet and outlet areas clean. b. Failure to service the air filters. c. Breakage due to mishandling or misuse of the product or part. d. Failure to follow and perform scheduled maintenance as prescribed in supplied manuals. (See Maintenance Schedule in O&M) 6. Rental of any equipment during the performance of warranty repairs. 7. Parts purchased from sources other than CDI, Replacement of a failed CDI part with a non-CDI part voids warranty on that part. (Unless prior written authorization has been give by CDI for you to do so.) 8. Warranty Labor. 9. Shop supplies such as adhesives, caulk, cleaning supplies, and rags. 10. Expenses incurred investigating performance complaints unless the problem is caused by defective CDI materials or workmanship. 11. Electrical parts supplied by customer. REPLACEMENT PARTS When writing or calling to Concepts and Designs Inc. for service parts, provide the model number and serial number of the unit as stamped on the unit plate attached to the electrical door. For questions regarding wiring diagrams, it will be necessary to provide the number on the specific diagram. If replacement parts are required, include the date of installation, the date of failure, an explanation of the malfunction, and a description or part number of the replacement parts required. 62 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual Troubleshooting Guide For information on troubleshooting your unit not covered by the following guides, contact the Customer Service Department at Concepts and Designs Inc. (507) 451-2198 ---- Rotor Section ---PROBLEM Rotor does not turn Rotor turns, but drying performance is poor POSSIBLE CAUSE Power not on Turn selector switch to DH Rotor Stuck or Frozen in place Determine cause from other inspection and repair Drive Motor does not turn Fuse blown, replace if necessary Replace Drive Motor if necessary Seals are sticking Loosen if stuck or frozen to unit Drive chain is not engaging sprocket on Rotor Adjust, straighten and align drive sprocket with rotor sprocket. Tensioner not tight Adjust Tensioner Poor performance Determine Cause from other inspection Seal not engaging with cassette causing bypass of air. Check seal clearance, adjust or Replace seals if necessary Blow out dirt if possible with compressed air, replace if necessary Dirty or damaged rotor High Process Outlet Temperature CORRECTIVE ACTION Poor seal clearance Check seal clearance, adjust or Replace seals if necessary Check Rotor Speed Contact Factory Low Reactivation Poor seal clearance Outlet Temperature Check seal clearance, adjust or Replace seals if necessary Check Rotor Speed Contact Factory Check Heated Temperature Check heated to temperature adjust to proper setpoint if necessary 63 Concepts and Designs Inc. Troubleshooting Guide --- General Unit shut down problems --PROBLEM Unit will not start at all Unit runs for 1 Minute and shuts down. POSSIBLE CAUSE CORRECTIVE ACTION Unit selector switch not in the Vent or DH position Check to see if unit is calling for DH mode to run. Make sure the jumper plug is plugged in or the optional humidistat or selector switch is in the proper mode Phase Monitor (Option, if Installed) ON light not lit up See (Phase Monitor ON light not lit up under “Red Faults Lights On” in Fault Light Section) Process Airflow switch is not closing Check to make sure the process fan is running, if not check to make sure that the fuse are not blown or if equipped with an overload that it is not tripped, reset or replace if necessary If supply motor is running make sure the tubes attached to the airflow switch are in good condition, replace tubes or switch if necessary. Unit runs for 10 Minutes and shuts down. DH Motor Not Running (Rotation Fault) Check the fuse for rotor motor and replace if necessary. If fuse is good check to make sure there is power to the motor, replace motor if necessary, or see (DH Rotor Not Turning) High Limit Tripped Make sure the switch is set for 325 to 350° and then reset high limit switch, if you can not reset you may need to replace. 64 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual Troubleshooting Guide PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION Unit runs for 10 Minutes and shuts down. (cont.) Rotation Switch or proximity sensor not hitting contacting with magnet or cam on the rotor Adjust sensor to come in contact with the magnet on the rotor or adjust the limit switch to trigger when the switch is half way up the ramp. Unit runs for 15 Minutes and shuts down. Temperature not staying above 95° F on the reactivation outlet See (Low Reactivation Temperature under “Red Fault Lights On” in Fault light Section) 65 Concepts and Designs Inc. Troubleshooting Guide --- Reactivation Section --PROBLEM No Blower Operation POSSIBLE CAUSE CORRECTIVE ACTION Mode Selector Switch Switch in OFF position Control Transformer Place switch in proper mode No input voltage Check disconnect and supply fusing Replace control fuse Blown control fuse Defective transformer Motor Protection Replace transformer Overload on motor tripped Reset overload and check motor amps/overload setting Fuse blown Replace fuse Motor Starter Defective motor starter Motor Replace motor starter No input voltage Check fusing Improper wiring Correct wiring Defective motor Replace motor Blower Damage Defective or locked bearings Replace bearings Check for physical damage Replace or repair blower Wheel came loose from shaft Realign and tighten 66 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual Troubleshooting Guide PROBLEM No Blower Operation POSSIBLE CAUSE CORRECTIVE ACTION Control Relays Improper part Improper wiring Check relay voltage Check wiring Defective relay Replace relay Open Humidistat (Optional) Humidistat satisfied Defective humidistat Blower Runs; No Reactivation Heat; Mode Selector Switch Switch in VENT position Manual Gas Valve Main burner gas valve closed Adjust humidistat, if applicable Replace humidistat Place switch in proper mode Open gas valve Airflow Switch Blower running backwards Blocked intake or discharge Clogged airflow tube or pickup ports Defective switch Flame Safeguard Relay (FSR) No input voltage Reverse motor direction Find and remove obstructions Clean or replace tubing or pickup ports Replace switch Moisture in FSR Checking wiring Dry out FSR Defective FSR Replace FSR 67 Concepts and Designs Inc. Troubleshooting Guide PROBLEM CORRECTIVE ACTION POSSIBLE CAUSE Blower Runs; No Reactivation Heat; Igniter (During trial for ignition:) No current (open igniter) Check igniter current and spark No voltage Check FSR output to spark rod High Limit High limit tripped Reset high limit High limit does not reset Replace high limit Gas Valve Main valve does not open Check FSR output to main valve during ignition trial. Check gas valve circuit and wiring. Compare supply voltage to nameplate voltage. Inlet gas pressure too high. Defective solenoid Regulator Clean and/or replace gas valve parts. Replace solenoid or valve assembly. Clogged vent orifice Clean or replace orifice No supply pressure Check all gas cocks and piping Improper manifold pressure Adjust regulator Defective regulator Replace regulator 68 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual Troubleshooting Guide PROBLEM Blower Runs; No Reactivation Heat; POSSIBLE CAUSE No Flame Signal Flame rod oxidized Scrape oxide coating off rod or replace flame rod. Dirt buildup on insulator Clean dirt deposit from insulator surface and install protective boot. (Low fire not properly adjusted) Low fire set to low Adjust low fire. Flame rod ceramic cracked Flame Safeguard Relay (FSR) Defective FSR High Limit Tripped CORRECTIVE ACTION Replace flame rod. Replace FSR High Limit Temperature reading for high limit went above 325º F Reset high limit High limit will not reset Replace high limit Airflow Restricted Blower running backwards Reverse motor direction Belts slipping Tighten and/or replace belts Blocked intake or discharge Find and remove obstruction Continuous High Fire Foreign material holding valve open Clean, replace valve and/or seat if necessary Plunger jammed Clean, or if necessary, replace plunger Faulty amplifier Replace faulty amplifier 69 Concepts and Designs Inc. Troubleshooting Guide PROBLEM High Limit Tripped Modulating Valve Does Not Modulate; Continuous High Fire POSSIBLE CAUSE CORRECTIVE ACTION Unit Over firing The discharge temp with burner operating exceeds allowable temp rise for the heater Modulating Valve Adjust modulating valve or regulator to obtain temperature rise specified for unit Foreign material holding valve open Plunger jammed Disassemble valve remove foreign material replace valve and/or seat if necessary Clean or if necessary replace plunger Discharge Or Entering Air Temperature Sensor Open circuit in discharge temperature sensor Replace the sensor Temperature control system out of calibration range Perform temperature control system calibration Sensor cross-wired to controller Amplifier (SC11B) Correct wiring terminations Faulty amplifier Modulating Valve Does Not Modulate; Continuous Low Fire Replace faulty amplifier Amplifier (SC11B) Three position dip switches on circuit board not set to correct position for 4-20mA or 0-10 volt input signal Set dip switches to desired position for operation SC11B input not phased correctly for + & - Switch wires around to match + or - Faulty amplifier Replace faulty amplifier 70 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual Troubleshooting Guide PROBLEM Modulating Valve Does Not Modulate; Continuous Low Fire POSSIBLE CAUSE Transformer No voltage output to amplifier Replace transformer (also check for short in modulating valve coil) Modulating Valve Valve coil is open or shorted Replace coil if its resistance is less than 40W or greater than 85W. Plunger jammed Clean or replace plunger Ruptured main or balancing diaphragm Determine diaphragm condition and replace if defective CORRECTIVE ACTION Carel Controller No output from to SC11B 71 Replace if defective Concepts and Designs Inc. Troubleshooting Guide ---- Process - Supply Section ---- No Blower Operation CORRECTIVE ACTION POSSIBLE CAUSE PROBLEM Mode Selector Switch Switch in OFF position Control Transformer Place switch in proper mode No input voltage Check disconnect and supply fusing Blown control fuse Replace control fuse Defective transformer Replace transformer Motor Protection Motor overload tripped Fuse Blown Reset motor overload and check motor amps Replace Fuses Motor Starter Defective starter Replace motor starter Motor No input voltage Check fusing Improper wiring Correct wiring Defective motor Blower Damage Replace motor Defective or locked bearings Replace bearings Check for physical damage Replace or repair blower 72 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual Troubleshooting Guide PROBLEM No Blower Operation POSSIBLE CAUSE Control Relays CORRECTIVE ACTION Improper part Check relay voltage Improper wiring Check wiring Defective relay Open humidistat (Optional) Replace relay Humidistat satisfied Adjust humidistat, if applicable Defective humidistat Replace humidistat 73 Concepts and Designs Inc. Troubleshooting Guide ------ Fault Lights ----- PROBLEM Red Fault Lights On POSSIBLE CAUSE CORRECTIVE ACTION Other Faults Supply Airflow Switch does not make to close R4 relay within 1 minutes time. If supply motor is not running see (No Supply Blower Operation). If supply motor is running make sure the tubes attached to the airflow switch are in good condition, replace tubes or switch if necessary. Alarm on the Honeywell Flame Safety (Gas Units Only) Reset the Honeywell flame safety and then the Fault Reset button. Some Customer supplied device is tied into the external faults relay. Make sure that any external device provided by customer are not causing the alarm to the unit. Phase Monitor (Option If Installed) ON light not lit up Check all of the setting on the phase monitor to be sure they are properly set to the voltage you are operating the unit at and then check rotation of the motors on the unit to make sure it is correct, check to make sure you have proper voltage supplied to the unit & that the amp draw on all three power legs is approximately the same. If this does not solve the problem call CDI Customer Service Department @ 507-451-2198 74 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual Troubleshooting Guide PROBLEM Red Fault Lights On (cont.) POSSIBLE CAUSE Rotation Faults DH Motor Not Running CORRECTIVE ACTION Check the fuse for rotor motor and replace if necessary. If fuse is good check to make sure there is power to the motor, replace motor if necessary, or see (DH Rotor Not Turning) High Limit Tripped Reset high limit switch Alarm on the Honeywell Flame Safety (Gas Units Only) Reset the Honeywell flame safety and then the Fault Reset button. Rotation Switch not hitting cam on the rotor Adjust switch to hit the cam on rotor when the switch is half way up the ramp. Rotation Switch is not closing when triggered Change out switch Low Reactivation Temperature (Electric) Bad Inlet or Outlet sensor causing the unit to drop to a set maximum output. Replace sensor Breakers tripped or Fuses blown for some of the electrical heater elements Reset Breakers and or replace Fuses Coil on electric heater elements burned out or broken (Inspect the electric heater elements to make sure they are in good shape with no broken wires) Replace the electric heater elements if bad or defective. 75 Concepts and Designs Inc. Troubleshooting Guide PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION Red Fault Lights On (cont.) No power from the Carel controller to the SCR After call for DH unit will not have any power output for 60 seconds and then should have an output. If no output replace Controller. 3 Phase power to the SCR but no Check to see if there is a 0-10 power out to the electric heater VDC out to the SCR , if none check to see if there is any output power coming from the Carel Controller. If you have power from the Controller and have power to all three legs entering the SCR, the SCR could be bad, Please call 507-451-2198 for more troubleshooting. Low Reactivation Temperature (Gas) Bad Inlet or Outlet sensor causing the unit to drop to a minimum burner output Replace sensor Manual gas valve to the burner Shut unit off and open the gas is closed not allowing gas to flow valve, then restart the unit. to main burner. Spark Rod not set properly or Adjusts spark rod to proper lois dirty. cation between two of the holes on the pilot tube. Crack in porcelain of flame rod or spark rod causing grounding of the rod. Replace if cracked Dirty Flame Rod Clean or replace flame rod. 76 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual Troubleshooting Guide PROBLEM Red Fault Lights On (cont.) POSSIBLE CAUSE Low Reactivation Temperature (Gas) cont. No gas getting to the pilot assembly. CORRECTIVE ACTION Pilot regulator plugged or Bad, Replace if you have a good flame but no signal, after making sure to check the condition of the wire. Pilot regulator plugged or Bad Make sure pilot regulator is not plugged and replace if necessary. Gas valve for pilot not opening Check for voltage to the coil and replace if necessary. No gas to unit or main valve Turn main gas valves open closed and then bleed the gas line if necessary. No power from the RRC controller to the SC11B Maxitrol Selectra Signal Conditioner Power to the SC11B Maxitrol Selectra Signal Conditioner but none out 77 After call for DH unit will not have any power output for 60 seconds and then should have an output. If no output replace RRC card. Check to make sure the SC11B has 24 volt power supply between terminals 1 & 2. If you have power and an inlet voltage to terminals 5 & 6 but no output from 3 & 4 you will need to replace the defective part. Concepts and Designs Inc. Troubleshooting Guide PROBLEM Green Lights Not On POSSIBLE CAUSE Process Fan Light Not On Unit selector switch not in the Vent or DH position CORRECTIVE ACTION Check to see if unit is calling for DH mode to run. Make sure the jumper plug is plugged in or the optional humidistat or selector switch is in the proper mode Process Air Flow Light Not On Process Airflow switch is not closing Check to make sure the process fan is running, if not check to make sure the breaker for the fan is not tripped. If Process/Supply motor is not running see (Process Motor Doesn’t Run) If supply motor is running make sure the tubes attached to the airflow switch are in good condition, replace tubes or switch if necessary. Reactivation Fan Light Not On Unit Not Calling for DH Check to see if unit is calling for DH mode to run. Make sure the jumper plug is plugged in or the optional humidistat or selector switch is in the proper mode High Limit May Be Tripped Reset high limit switch 78 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual Troubleshooting Guide PROBLEM Green Lights Not On (cont.) POSSIBLE CAUSE Reactivation Air Flow Light Not On Reactivation Airflow switch is not closing. CORRECTIVE ACTION Check to make sure the reactivation fan is running, if not check to make sure the breaker for the fan is not tripped. If Reactivation motor is not running see (Reactivation Motor Not Running) If reactivation motor is running make sure the tubes attached to the airflow switch are in good condition, replace tubes or switch if necessary. Amber Lights Not On Power Light Not On Selector switch is in the off position Move selector switch to the Auto or Manual position Main Power Disconnect Switch in the off position Move Disconnect switch to the ON position Call For Dehumidification Light Not On Selector switch is in the OFF Move selector switch to the position Vent or DH position Unit Not Calling for DH 79 Is the “Call for Dehumidification” relay energized, if not adjust humidity transmitter to a lower set point to make the unit call for Dehumidification. Concepts and Designs Inc. MAINTENANCE LOG Model No._______________________________________ Serial No. _____________ Date Activity 80 Technician DH Series - SSCR Rotor Installation, Operation and Maintenance Manual MAINTENANCE LOG Model No._______________________________________ Serial No. _____________ Date Activity 81 Technician Concepts and Designs Inc. Notes 82 DH Series - SSCR Rotor Installation, Operation and Maintenance Manual Notes 83 Concepts and Designs Inc. Property of 84