Manual - Pure-Aire

Transcription

Manual - Pure-Aire

Installation, Operation and Maintenance Manual
Cool Force™ Cycling Refrigerated Air Dryers
© 2013 Pure-Aire
Cycling Refrigerated Air Dryer Operation Manual – Rev. 1
Page 1
GENERAL INFORMATION
Pure-Aire is a global leader in the design and manufacturing of products for the drying and purification of compressed
air and gas.
Our product line includes pressure flow controllers, fluid coolers, water separators, compressed air filters, refrigerated
air dryers and heatless, patented zero-purge and heat reactivated desiccant air dryers.
Please review this detailed and comprehensive instruction manual for the use of the Pure-Aire refrigerated air dryer.
Operational information is supplied for the user and supporting information for the technical personnel who may repair
the dryer in the event that it is ever necessary. It is recommended that all who will have responsibility for the dryer
should carefully read all sections of this manual before commencing with installation.
Thank you for choosing Pure-Aire to service your compressed air needs. Please call if we can be of further assistance.
IMPORTANT
Warranty registration will improve the parts availability with your Local
Authorized Dealer and Service Center and extend the warranty. Register
your products online or complete the warranty registration sheet.
(800) 274-3233
www.pure-aire.net
© 2013 Pure-Aire
Page 2
TABLE OF CONTENTS
Safety Warnings .......................................................................................................................................................... 4
Receiving & Start-Up Review ..................................................................................................................................... 5
Design Concept ........................................................................................................................................................... 7
Diagram # 1 – Compressed Air Recommended Installation Flow ......................................................................... 9
Safety Precautions ................................................................................................................................................... 10
Pressurization & Start-Up Procedure ..................................................................................................................... 11
Cool Force™ Cycling Dryer Microprocessor Control System ............................................................................. 12
ZLD—Zero-Loss Drain Condensate Discharge System........................................................................................ 16
Cool Force™ Cycling Dryer Maintenance .............................................................................................................. 17
Outdoor Installation .................................................................................................................................................. 18
Trouble Shooting Guide ........................................................................................................................................... 19
Dryer is Not Operating................................................................................................................................. 19
Air Dryer is Running But Air Temperature is Too High ........................................................................... 19
Dryer Short Cycles While Running ............................................................................................................ 20
Refrigerant Compressor Will Not Start (Humming) .................................................................................. 20
Compressor Starts and Runs for a Short Time But Cycles Off on Overloads ...................................... 20
Head Pressure is Too High ......................................................................................................................... 20
Head Pressure is Too Low .......................................................................................................................... 21
Noisy Dryer Inside Enclosure ..................................................................................................................... 21
Frosted Liquid Line...................................................................................................................................... 21
Dryer is Running But Air Flow is Erratic or Zero ...................................................................................... 21
Wrong Condenser Fan Motor Operating in Wrong Direction .................................................................. 21
Electrical Schematics ............................................................................................................................................... 22
© 2013 Pure-Aire
Page 3
SAFETY WARNINGS 
DO NOT service dryer, associated filters and equipment while under pressure.

Disconnect electrical (and pneumatic) power before servicing dryer and associated filters.

Eye and ear protection should always be used for when working on or near dryer. Dryer exhaust ports can raise
dust and particles.

Automatic drain valve on coalescing pre-filter will eject water, oil, particles and air under pressure when open.
Condensate drainage from coalescing pre-filter and moisture separator on dryer may contain oil or other
contaminants. Be sure to follow all local regulations for proper handling and disposal.
WARNING
WARNING
1. Relieve air pressure before servicing dryer or
associated equipment.
1. Always use two wrenches when installing/tightening
piping connections to prevent over-torque stress and
damage to connection.
2. Disconnect power and Lockout/Tagout (LOTO)
before servicing dryer.
2. Always read and follow the instructions before
operating dryer.
3. NOT SAFE for human respiration (breathing).
3. Comply with electrical installation and service
guidelines for the National Electrical Code and the
Federal, State and Local Codes when working with
this equipment.
4. Connect oil coalescing pre-filter with automatic drain
before the dryer.
4. Follow the Pressurization Start-Up and Shut-Down
Procedures daily.
5. Secure drain lines to prevent bodily injury due to
unsecured pressurized drain lines whipping.
5. Review the operations of the pre-filter and separator
drains for proper removal of condensate/water
drainage daily. Use eye and ear protection when in
the vicinity of the dryer.
6. The standard designed operation for dryers are:
- Ambient temperature of 100°F.
- Inlet air process temperature of 100°F.
- Operating pressure of 100 psig.
6. Dryer operations above or below these design
specifications should be reviewed for proper
application.
© 2013 Pure-Aire
Page 4
RECEIVING AND START-UP REVIEW
RECEIVING & INSPECTION:
Inspect dryer carefully upon arrival. Uncrate and inspect for concealed damage. Any damage should be notified to the
freight carrier immediately on the freight bill. File claims with the freight carrier immediately and notify Pure-Aire’s Sales
Department.
NOTE: All Pure-Aire refrigerated dryers are shipped with SHOCKWATCH / Tip N Tell impact indicators to indicate
mishandling and reduce damage related costs by indicating when fragile products have been exposed to a potentially
damaging impact during transit or in storage.
To facilitate handling during shipment, all dryer packages have access that provides for fork lifting between two base
channels. Forks should extend all the way through forklift channels to reduce unnecessary forces to the dryer during
moving.
WARNING
DO NOT install, operate, maintain, adjust or
service this unit without thoroughly reading
this manual.
All dryers are tested and inspected at the factory prior to shipping.
Improper operation will cause poor results or mechanical failures
from the dryer.
DRYER LOCATION:
Locate the dryer in an area accessible for maintenance. The area should be clean, cool, well lighted and have a level,
vibration free floor. Ambient temperature should be between 50°F and 100°F. The ambient area and location must be free
from explosive fumes, corrosive chemical fumes and high pH environments. The dryer must be located in an area that
provides sufficient clearance from walls and other adjoining equipment to allow easy access for service requirements. Dryer
should have a 30” minimum clearance on all sides. See dimensional print for specific clearance requirements.
INSTALLATION:
(See typical installation drawing)
WARNING
CRANKCASE HEATER
Dryers are equipped with a compressor
crankcase heater. This heater must be
energized by closing the fused electrical
disconnect switch at 10-hours minimum
before start-up.
Make the following piping connections:
Always use two wrenches when installing piping connections to
prevent over-torque stress and damage to connection when
tightening.
1. Dryer inlet piping with an isolation valve.
2. Dryer outlet piping with an isolation valve.
3. Coalescing pre-filter and particulate after-filter.
4. Automatic drain on pre-filter.
5. Manual bypass valves are recommended. A bubble tight
valve should be used for bypass.
SECURE DRAIN LINES:
Fasten drain lines from pre-filter/separator to floor or drain. Pressurized air will periodically pass through drain lines,
which will cause an unsecured line to whip and may cause bodily injury.
© 2013 Pure-Aire
Page 5
ELECTRICAL CONNECTIONS:
Electrical connections are to be performed by a qualified person only.
Observe Lockout/Tagout Procedure:
Disconnect, lock and tag out all power at source prior to attempting repairs or adjustments to rotating machinery.
WARNING
Comply with the National Electrical Code
and the Federal, State and Local Codes
when installing or operating this unit.
Make required electrical connections to the control box. Check
and read over wiring diagram that pertain to your unit and make
sure the correct power supply is connected. DO NOT energize
circuit at this time. Follow all applicable codes.
NOTE: Customer to provide short circuit protection for dryer.
For water-cooled dryers, connect cooling water lines to the water-cooled condenser from the water supply as per dryer
specifications. Condenser water pressure must be a minimum of 35 psig.
Strainers are recommended at the water inlet to the condenser. Proper chemical treatment is recommended to avoid
scaling and sludge inside the condenser.
© 2013 Pure-Aire
Page 6
DESIGN CONCEPT
Cool Force™ technology ensures a consistent dew point is held under 40°F. Dual cycling set points and microprocessor
controls safely ensure maximum cooling throughout the entire flow of operation during all load conditions.
The refrigeration system is designed to remove moisture by cooling the air with Cool Force™ media and a refrigeration unit
to a temperature at which moisture in the air is condensed and separated from the air stream. The compressed air
temperature is normally cooled between 35°F and 40°F. This TH-1 temperature is known as dew point.
© 2013 Pure-Aire
Page 7
Pre-filtration is recommended to ensure maximum dryer performance and protection from airborne contamination,
debris and oil contaminants associated with compressors. Pre-filters and after-filters should be sized according to
your drying and contaminant removal applications. Please contact Pure-Aire or your local distributor to select the
filter that best suits your filtration requirements. In addition to air filtration, condensate drains and discharge oil/water
separators are also available to address stringent EPA regulations.
Compressed air entering the dryer is saturated when it enters the air-to-air pre-cooler/re-heater. The temperature of
the air is reduced prior to entering the chiller by the cool air exiting the moisture separator. This pre-cooling of the air
allows the Cool Force™ media chiller section to consistently maintain the desired dew point under 40°F. The
temperature of the Cool Force™ media fluid is maintained by the microprocessor controls and the refrigeration circuit
controls.
Compressed air flow continues to the centrifugal separator where moisture condensate is removed through the zero
air-loss drain. The cold and dry compressed air flow continues to the air-to-air pre-cooler/reheater. This exiting cold
air temperature is warmed via the air inlet temperatures entering.
The refrigeration system consists of all the components which handle R-404A. The refrigeration controls maintain a
hermetically sealed, closed-loop system. A well-maintained, air-cooled or water-cooled condenser will ensure proper
cooling to the air dryer system. The air-cooled condenser is protected by a washable electrostatic filter. An optional
thermostatic expansion valve is available that meters the refrigerant for proper cooling capacity into the evaporator.
Water separators utilize centrifugal technology which provides a more efficient method of bulk liquid removal. Using
a combination of direction change and centrifugal action, water is effectively separated from the compressed air flow.
The cold coalescing filter and separator positioned at the point of the lowest air temperature (dew point temperature)
improves the separation efficiency of water and oil condensate. (Filter must be changed annually.)
© 2013 Pure-Aire
Page 8
DIAGRAM #: 1 – COMPRESSED AIR RECOMMENDED INSTALLATION FLOW
© 2013 Pure-Aire
Page 9
SAFETY PRECAUTIONS Refrigerated dryers are designed to remove water VAPOR only! If liquid condensed water is not removed at
the after-cooler, separator and/or drain, it will reduce the cooling capacity of the dryer.
Failure to observe any of the following precaution could result in severe bodily harm and/or damage to
equipment:

Use eye and ear protection when in the vicinity of the dryer.
WARNING
As equipped, air from compressor and air
drying system is not safe for human
respiration (breathing).
To provide safe, breathable air, compressor must be capable
of producing at least Grade D breathing air as described in
Compressed Gas Association Commodity Specification G7.1 1966.
Special filtering, purifying and associated alarm equipment must
be used to convert compressed air to “BREATHING AIR”. Other
special precautions must also be taken.
DISCLAIMER OF WARRANTY:
If this unit is used to produce breathing air, OSHA 29 CFR 1910.134 specifications of the necessary equipment and
special precautions to make breathing air MUST be used or any warranties are VOID and manufacturer disclaims any
liability whatsoever for loss, personal injury or damage.
DRYER CONNECTIONS REVIEW:
An inspection of the dryer is required to ensure that nothing came loose during shipment.
Review that the new piping systems are not placing undue stress on the dryer connections. Flexible joints and unions are
recommended to relieve stress. Piping systems must be properly supported with hangers or brackets. It is recommended
that air piping be installed by an experienced pipe fitter.
ELECTRICAL CONNECTIONS:
Check and read over wiring diagram that pertain to your unit and make sure the correct power supply is connected. DO NOT
energize circuit at this time. Follow all applicable codes. NOTE: All components must be load rated as approved by NEC,
NEMA, CSA and UL.
During shipment, electrical and wiring connections may become loose. Per UL specifications, torque screws inside the
enclosure to an approximate 20 in-lbs.
GROUNDING:
It is mandatory that the dryer be grounded properly. Use an adequately sized ground wire conductor that is sized to NEC.
STORAGE:
In the case that extended storage is required, please consult the Pure-Aire storage procedures.
© 2013 Pure-Aire
Page 10
PRESSURIZATION & START-UP PROCEDURE
Initial Start-Up:

Qualified personnel must perform the initial start-up. Completion of the warranty registration is required within 30
days of start-up.

Ensure that all the steps of the installation procedure has been followed.
NOTE: The following units must be started up by an authorized distributor.

Refrigerated, Cycling C-Series 3200 cfm and larger

Regenerative H and Z-Series 2000 cfm and larger

Closed Loop Cooling System CLC-300 and larger
This procedure is to be followed every day at start-up:

For water-cooled models, water valve must be manually opened to ensure that the condenser is full of water prior
to start-up.

Before starting your compressor, review the operations of the dryer and equipment.

Start dryer with no air load (no air flow). This enables the dryer to reach its proper operating temperature in the
shortest time possible (typically within 5 to 20 minutes).

Press the START button to start the dryer. The Cool Force™ microprocessor controls are constantly controlling
the air dew point and glycol temperatures. The dual cycling set points and microprocessor controls are either
controlling the air dew point or glycol temperature readings are below the cycling settings. This will control the
cycling of the main contactor refrigeration compressor.

Pure-Aire dryers are available with an ambient air washable electrostatic package filter designed to protect the
condenser from dirt and debris that can accumulate. For proper operation, it is imperative that this filter be
inspected and cleaned on a regular basis. For applications where excessive dirt, dust or debris is encountered,
more frequent inspection and cleaning may be required.

Dryer inlet, outlet and bypass isolation valves should be closed.

Before starting dryer, the unit should be bypassed and not yet pressurized.

Press the START button on the compressor and the air system should pressurize.

Slowly open inlet isolation valve and gradually increase pressure on the dryer to full line pressure. Watch the
pressure increase. DO NOT open inlet valve abruptly, as this could shock the filters in the system.

After the dryer is pressurized and ready for operation, slowly open the outlet isolation valve. DO NOT open
outlet valve abruptly, as this could shock the filters in the system and cause the dryer not to function properly. A
high volume of air traveling through the dryer will cause moisture to travel downstream.

Close dryer bypass valve. Bypass valves must be bubble tight to prevent moisture from migrating around dryer
and contaminating the dry air outlet.

Dryer should now operate continually and automatically.
WARNING
© 2013 Pure-Aire
ALWAYS REMOVE ALL PRESSURE AND DISCONNECT ALL POWER BEFORE
SERVICING DRYER. NEVER SERVICE DRYER OR FILTERS WITHOUT FIRST
RELIEVING PRESSURE. Cycling Refrigerated Air Dryer Operation Manual – Rev. 1
Page 11
COOL FORCE™ CYCLING DRYER MICROPROCESSOR CONTROL SYSTEM
After a period of non-use the graphic display light level will reduce until a key is pressed.
P00 is the default menu view after power up and where the display will return after a period of non-use.
Use the
&
keys to navigate between menus.
Where applicable, the menu item highlighted will toggle between the default menu display and additional menu information.
Use the enter
key and the escape key
to toggle between menu page navigation and menu content navigation.
Entering the menu content area navigates to the first item of the menu. Use the
&
keys to navigate between
menu parameters. Menu parameters are vertically assembled and in a continuous loop. (For example, below indicates the
user has navigated to P01 menu item 06.)
To edit an accessible and editable menu item, navigate to it and press the enter
key.
For security purposes, the “Service” and “ADMIN” accounts require a 4 digit PIN code. The PIN codes are not printed in this
manual. Please contact Pure-Aire.
Use the
&
keys to navigate between menu parameters. Use the enter
key to acknowledge the entry.
The “Operator“ user is the default user and does not require a PIN. The “Operator“ can view information and the operating
values can be viewed as read only.
MENU
P01 Operation Menu
P01.01 : 1H
P01.02 : 1L
P01.03 : 2H
P01.04 : 2L
P01.05 : P>
P01.06 : T>
© 2013 Pure-Aire
PARAMETER DESCRIPTION
Dew Point Cycle ON Temperature
Dew Point Cycle OFF Temperature
Glycol Temperature Cycle ON
Glycol Temperature Cycle OFF
Pressure Unit
Temperature of Unit
DEFAULT VALUE
100°F
34°F
39°F
32°F
PSI
°F
Page 12
MENU
PARAMETER DESCRIPTION
DEFAULT VALUE
P02 Error Log Menu
P02.01 : Error Code
P02.15 : Error Code
Logged Error #1
Logged Error #15
P03 Shutdown Menu
P03.01 : T1
P03.02 : T2
Dew Point Temperature Shutdown Level
Glycol Temperature Shutdown Level
125°F
105°F
P04 Alarm Menu
P04.01 : SD
P04.02 : T1
P04.03 : T2
P04.04 : PL
Service Timer (Hours Due)
Dew Point Temperature Warning Level
Glycol Temperature Warning Level
Low Pressure Warning Level
8000 Hrs.
110°F
90°F
P06 Diagnostic Menu
P07 Configuration Menu
P09 Calibration Menu
P10 Configuration Menu 2
5.0 FAULT MESSAGES
Faults are states of abnormal operating conditions.
Alarms are fault states that indicate normal operating conditions have been exceeded but do not present an immediate
hazard or potentially damaging condition. Alarms are intended as a warning only and will not stop the compressor or
prevent the compressor from being started.
Start inhibits are fault states that prevent the compressor from initially being starting. Start inhibit faults are conditions
that may present a hazard or damaging situation if the compressor was to be started and run. A start inhibit will self
reset when the condition being monitored returns to normal operational levels. Start inhibit conditions are only checked
during the initial start procedure and will not stop the compressor once started and in the “Started” state. Start inhibit
conditions are not checked during an automated motor start from Standby.
Shutdown trip errors are fault states that present a hazardous or damaging condition, the compressor is stopped
immediately.
The shutdown trip error condition must be resolved and the fault reset before the compressor can be restarted.
© 2013 Pure-Aire
Page 13
Different fault state conditions are indicated on the screen with specific codes. The last character indicating
the fault type:

E = Shutdown Trip Error

A = Alarm

S = Start Inhibit
Shutdown Trip Errors are divided into two different categories:

Immediate Shutdown Errors:
 Immediate shutdown errors stop the compressor instantly (For example: Emergency Stop button is activated).
 Immediate shutdown errors have an error code where the first character is “0” (zero).

Controlled Stop Errors:
 Controlled stop errors stop the compressor in a controlled way using a normal stop command.
 Motor will continue to run until the set stop is reached (run-on time).
 Controlled stop faults have a “1” as the first character.
Alarm faults are also divided into different categories:

Alarms:
 Alarms start with the number “2”.

Service Alarm Messages:
 Service alarm messages start with the number “4”.

Start Inhibit:
 Star inhibit fault codes start with the number “3”.
© 2013 Pure-Aire
Page 14
5.1 IMMEDIATE STOP SHUTDOWN ERRORS
5.1.1 DIGITAL INPUT ERRORS
MENU ERROR CODE
ERROR DESCRIPTION
Er:0010 E
Er:0020 E
Er:0030 E
Er:0040 E
Er:0050 E
Er:0060 E
Er:0070 E
Er:0080 E
Emergency Stop Disconnected, Digital Input C1 @ X05
Digital Input Disconnected, Digital Input C2 @ X05
5.1.2 ANALOGUE INPUT ERRORS
MENU ERROR CODE
ERROR DESCRIPTION
Er:0115 E
Er:0119 E
Er:0125 E
Er:0129 E
Er:0135 E
Er:0139 E
Delivery Pressure Sensor Fault
Delivery Pressure High
Dew Point Temperature, T1 Temperature Sensor Fault
High Dew Point Temperature, T1 Shutdown Level
Glycol Temperature, T2 Temperature Sensor Fault
High Glycol Temperature, T2 Shutdown Level
5.1.3 SPECIAL FUNCTION ERRORS
MENU ERROR CODE
ERROR DESCRIPTION
Er:0821 E
Low Resistance, Short Circuit or Short Circuit to Earth Condition
Exists on an Analogue Input or Digital Input (Incorrect Connection,
Cable Fault or Sensor Fault)
5.3 ALARMS
MENU ERROR CODE
ERROR DESCRIPTION
Er:2128 A
Er:2138 A
Alarm High Dew Point Temperature, T1 Warning Level
Alarm High Glycol Temperature, T2 Warning Level
5.3.2 ANALOGUE INPUT ALARMS
MENU ERROR CODE
ERROR DESCRIPTION
Er:2118 A
Er:2128 A
Er:2138 A
Alarm Delivery Pressure High
Alarm Dew Point Temperature, T1 Warning Level
Alarm Glycol Temperature, T2 Warning Level
5.5 Special Function Service Alarms
MENU ERROR CODE
ERROR DESCRIPTION
Er:4804 A
Service Hours Time Expired, Service Due
© 2013 Pure-Aire
Page 15
ZLD—ZERO-LOSS DRAIN CONDENSATE DISCHARGE SYSTEM
ZLD CONDENSATE DISCHARGE SYSTEM
On a minimum of a monthly basis, the operation of the ZLD automatic drain should be checked. The drain should be
removed and cleaned to ensure no debris from the system is trapped inside the drain. Figure 4 illustrates the drain assembly.
A. Condensate enters the collection
vessel and accumulates. When the
condensate level reaches the high level
sensor, the solenoid valve is activated
and the condensate discharged.
B. As the level of condensate reduces, it
reaches the low level sensor which
signals the valve.
Malfunction could be caused by:





Incorrect installation.
Excessive condensate quantity (overloading).
Blocked outlet.
Pressure falling below the minimum required (12 psi).
Frozen piping. When condensate level triggers discharge sensor for 60 second
duration without a change in condensate level, alarm signal will be
activated.
Unit will then discharge by operating the solenoid valve every 3 minutes
in second intervals. The unit will return to normal sensing mode once
the discharge cycle is completed normally.
© 2013 Pure-Aire
Page 16
COOL FORCE™ CYCLING DRYER MAINTENANCE
Weekly
Monthly
(6 )
Months
Yearly
Review Dryer Temperatures & Operations
X
X
X
X
Check Auto Drains on All Components
X
X
X
X
Inspect & Clean Ambient Air Washable Electrostatic Filter
X
X
X
X
Inspect & Clean Refrigeration Condenser
X
X
X
X
Check Filter Differential Pressure Gauges
X
X
X
X
X
X
Clean Water-Cooled Refrigeration Condenser
X
X
Replace Pre & After-Filter Elements
X
X
CYCLING DRYER MAINTENANCE
Clean ZLD Auto Drain Solenoid and Pre-Filter Drain
© 2013 Pure-Aire
Page 17
OUTDOOR INSTALLATION (SHELTERED, ABOVE AN AMBIENT TEMPERATURE OF 45°F
Certain installations may need a dryer optionally installed outside due to available space or other jobsite
conditions. These outside dryer installation items should be incorporated into the system to help ensure
trouble-free operation.

A standard machine installed outside MUST NOT be started or run in an ambient temperature that may drop
below 45ºF in and around the dryer.

The dryer should be on a concrete pad which is designed to drain water away from it. If the concrete pad is
sloped, then the dryer must be mounted so that it is level. The base of skid must be sealed where it contacts the
concrete pad.

If installations that include more than one component, hot air exhaust should not be directed toward the fresh air
intake of the dryer.

Dryer must be in a fully enclosed room or building. Local weather conditions can be extreme and direct rain or
snow may fall on the unit. If installed under a shelter, air-cooled units must be positioned in a way that prevents
air recirculation. The ambient temperature must always be maintained above the minimum temperature of 45ºF.
© 2013 Pure-Aire
Page 18
TROUBLE SHOOTING GUIDE
DRYER IS NOT OPERATING.
NOTE: In normal operation, compressor cycles based on the microprocessor controls. When the temperature set
points are satisfied the compressor does not run.
Disconnect switch is open.
Reset the disconnect and observe dryer operations.
Fused disconnect switch is blown.
Replace blown fuses.
Tripped overloads.
Turn switch off, wait 15 minutes then check for overload
condition. The compressor overloads will reset automatically.
Refrigeration safety controls are open.
Reset controls. Repair or replace as required.
Frozen (locked) compressor.
Repair or replace as required.
Wiring improper or loose.
Check wiring with schematic. Repair or replace as required.
AIR DRYER IS RUNNING, BUT AIR TEMPERATURE IS TOO HIGH.
NOTE: The air temperature will read higher
temperatures at low flow conditions.
Confirm the air flow rate through the dryer.
Dirty air-cooled or water-cooled condenser.
Clean or repair condenser.
Circulating coolant pump is not running.
Check fuses and voltage. Repair or replace as required.
Glycol coolant has leaked out.
Check for leaks, repair and fill with proper coolant.
Microprocessor temperature sensors are not
reading accurately.
Adjust. Repair or replace as required.
Entering air temperature is too high.
Check after-cooler and lower the operating air temperatures.
Ambient (room) air temperature is too high.
Add ventilation, change location and lower the operating air
temperatures.
Air dryer unit is too small.
Add more air dryer capacity or replace dryer.
Refrigerant leak.
Locate with leak detector. Recover the refrigerant and weigh
charge. Repair leaks. Purge the unit, vacuum and weigh-in the
proper recharge. Replace refrigeration filter driers.
Refrigeration compressor is inefficient.
Expansion valve is out of adjustment.
Adjust. Repair or replace as required.
© 2013 Pure-Aire
Page 19
DRYER SHORT CYCLES WHILE RUNNING.
NOTE: In normal operation, compressor will cycle based on the microprocessor controls.
Refrigeration compressor motor overload is
cutting out.
Refrigeration compressor is cutting out on low
refrigerant pressure.
Check for high head pressure, clogged condenser, high ambient
temperature, high inlet air temperature or high air flow rates.
Check for operations of high pressure cut out. Repair or replace
as required.
Check for low suction pressure, low ambient temperatures,
operations of high pressure cut out and operations of fan cycling
controls. Repair or replace as required.
Check for shortage of refrigerant, Repair leaks and recharge.
Check for sticking expansion valve. Repair or replace as
required.
REFRIGERANT COMPRESSOR WILL NOT START (HUMMING).
Low line voltage.
Check for voltage and correct wiring. Correct.
Improper wiring to dryer.
Check wiring with schematic. Repair or replace as required.
Relay or contactor not closing.
Check for reasoning. Repair or replace as required.
Single phasing voltage
Check for fuse problem or voltage. Correct.
Frozen (locked) compressor.
COMPRESSOR STARTS AND RUNS FOR A SHORT TIME, BUT CYCLES OFF ON OVERLOADS.
Check for low voltage or phase unbalance.
Check voltage to be within 10% of voltage listed on nameplate.
Check for high current on overload.
Check wiring diagram and review for anything modified.
High discharge pressure.
Refer to high discharge pressure trouble shooting.
Short in compressor windings.
Check wiring resistance in compressor and replace if necessary.
HEAD PRESSURE IS TOO HIGH.
Dirty air-cooled condenser.
Blow clean with compressed air. Clean or repair as required.
Dirty water-cooled condenser.
Clean water-side with appropriate cleaning solution. Repair or
replace as required.
Location is too hot. Ambient room temperature.
Cool ambient. Add ventilation or relocate dryer.
Defective fan cycling switches or set points.
Fan motor operating in wrong direction.
Switch 2 of the 3-phase wires. Repair or replace as required.
Defective fan motor.
Defective water regulating valve.
Adjust and clean. Repair or replace as required.
Refrigerant overcharged.
Recover the refrigerant and weigh charge. Purge unit, vacuum
and weigh in the proper recharge.
Contaminants or air in the refrigeration system.
Check for reason, repair and replace refrigeration filter driers.
© 2013 Pure-Aire
Page 20
HEAD PRESSURE IS TOO LOW.
Defective fan cycling switches or set points.
Refrigerant shortage.
Recover the refrigerant and weigh charge. Locate and repair
leaks. Purge unit, vacuum, weigh in the proper recharge and
replace refrigeration filter driers.
Defective water regulating valve.
Adjust and clean. Repair or replace as required.
NOISY DRYER INSIDE ENCLOSURE.
Bent or damaged fan blade.
Straighten. Repair or replace blade as required.
Fan motor bearing worn.
Replace fan motor. Inspect mountings.
Fan motor or compressor mountings are loose.
Tighten or replace mountings, etc.
Refrigerant flooding back to compressor.
Check expansion valve and adjust. Repair or replace as
required. Check crankcase heater.
FROSTED LIQUID LINE.
Restricted refrigerant filter/drier.
Check for pressure drop and replace.
Valves on high pressure side partially closed or
restricted.
Open valves. Repair or replace as required.
DRYER IS RUNNING, BUT AIR FLOW IS ERRATIC OR ZERO.
Air-side freeze-up.
Check for microprocessor temperature sensors out of placement
or adjustment. Re-adjust temperature sensors. Repair or
replace as required.
Restrictions in piping system up or directly
downstream of air dryer.
Inspect all the compressed air filters, valves and piping systems.
Heat exchangers contaminated or clogged.
Clean with back-flushing water flow, pump and mild detergent.
WRONG CONDENSER FAN MOTOR OPERATING IN WRONG DIRECTION.
Fan motor operating in wrong direction.
Switch 2 of the 3-phase wires. Repair or replace as required.
(800) 274-3233
www.pure-aire.net
© 2013 Pure-Aire
Page 21

Manual - Pure-Aire

Transcription

Similar documents

VELTIA HAND DRYER Data Sheet

TECHNICAL DATA SHEET XLERATOR HAND

Giggles and Good Times Pigeon Forge, Tennessee

Wyse Dryer Brochure

Multi-Commodity Solar Tunnel Dryer

eXtremeAir CLEAN GUIDE

whirlpool® hybridcaretm dryer