AFHX Series 60Hz - Dunham

AFHX Series 60Hz
Air Cooled Screw Flooded Chillers
Cooling Capacity: 77 to 191 TR (271 to 672 kW)
R134a
Products that perform...By people who care
INTRODUCTION
For more than 100 years, Dunham-Bush has focused on innovative product development. Today, we
provide a full portfolio of HVAC/R products from Fan Coil Units to large centrifugal chillers as well as
many other innovative green solutions. Our commitment to innovation, matched with an aggressive
attitude toward growth, makes Dunham-Bush a leader in global markets. Our product development is
tailored to meet the specific needs of customers, building-by-building, country-by-country and region-byregion. No other HVAC/R manufacturer takes this approach to meeting your performance expectations.
AFHX, Air Cooled Screw Flooded Chillers, have a cooling capacity range from 77 to 191 TR [271 to 672
kW] in 60Hz version using environmentally sound HFC-134a refrigerant. The entire product line features
energy efficiency, installation ease, control flexibility, high reliability and advanced 2020i controller. The
AFHX range is AHRI certified and ETL listed.
TABLE OF CONTENT
Page No
Introduction .......................................................................................................................................................................................... 2
Nomenclature ....................................................................................................................................................................................... 2
Advantages of Flooded Chiller ............................................................................................................................................................. 3
Unit Features ........................................................................................................................................................................................ 5
Operating Benefits ............................................................................................................................................................................... 8
Typical Sequence of Operation ............................................................................................................................................................ 9
Application Data ................................................................................................................................................................................. 10
Physical Specifications ....................................................................................................................................................................... 11
Performance Data .............................................................................................................................................................................. 13
Dimensional Data ............................................................................................................................................................................... 15
Floor Loading Diagram ....................................................................................................................................................................... 18
Dimensional Clearance ...................................................................................................................................................................... 19
Evaporator Water Pressure Drop ....................................................................................................................................................... 20
Sound Pressure Data ......................................................................................................................................................................... 20
Condenser Fan .................................................................................................................................................................................. 21
Electrical Data .................................................................................................................................................................................... 21
Typical Wiring Schematic ................................................................................................................................................................... 22
Guide Specifications .......................................................................................................................................................................... 26
NOMENCLATURE
A F HX 150 T - 6 S R- HR
HR
LN
Air Cooled Chiller
= Heat Recovery
= Low Noise
Blank = R22
R
= R134a
Flooded Evaporator
Horizontal Screw Compressor
S
Q
= Standard
= Special
5
6
= 50Hz
= 60Hz
T
= Optional Two
Compressors
Blank = Standard
Nominal TR
-2-
ADVANTAGES OF FLOODED CHILLER
In a flooded evaporator the refrigerant surrounds
the tubes in the shell and the water to be cooled
flows through the tubes. The level of liquid
refrigerant in the shell is maintained by the
combined action of an electronic level controller
and mod-motor actuated ball valves which
regulates the subcooled liquid refrigerant into the
evaporator. This ensures that all the evaporator
tubes are completely immersed in the liquid
refrigerant for better heat transfer efficiency.
correspondingly higher Energy Efficiency Ratio
(EER) i.e. (BTU/Watt) or lower kW/TR.
FIGURE 1
For a Direct Expansion (DX) Evaporator the
refrigerant is expanded into the tubes while the
chilled water is circulated through the shell. A
thermostatic expansion valve is used to throttle
the refrigerant in maintaining constant superheat
of suction gas to the compressor.
The following are the advantages of using a
flooded chiller:
1. Higher Capacity and Higher EER
achievable with the Same Compressor
The flooded evaporator with all the copper
tubes immersed in the “boiling” liquid
refrigerant enables a small approach
temperature between the “boiling” liquid
refrigerant temperature in the shell and the
outlet chilled water temperature in the
evaporator tubes to be achieved. This
approach
temperature
or
temperature
difference
between
the
evaporating
temperature of the boiling liquid refrigerant and
the chilled water outlet temperature, for a
flooded evaporator, is typically less than 3°F
[1.7°C].
On the contrary, for a DX or Direct Expansion
Evaporator, the typical approach temperature
is between 8°F [4.4°C] to 10°F [5.5°C]. This
simply means that the same compressor in a
flooded evaporator system will operate at a
higher saturated evaporating temperature
when compared to the same compressor in a
DX Evaporator system, when outlet chilled
water temperatures in both cases are set at
the same temperature.
A DX Evaporator uses TXV throttling to
maintain about 10°F [5.5°C] to 15°F [8.3°C]
suction superheat to prevent liquid flood back
to the compressor. In a flooded evaporator, the
refrigerant boils off in the shell and gas can be
sucked out from the top of evaporator back to
compressor. The suction superheat is usually
about 2°F [1.1°C] to 3°F [1.7°C]. Reduction in
suction superheat will further increase the
capacity performance of the compressor.
DX Evaporators are typically designed with
higher tube velocities to ensure proper oil
return to compressor both at full load and at
reduced load. This will contribute to higher
refrigerant pressure drop through the
evaporator. On the contrary, there is very little
shell side pressure losses for a flooded
evaporator. Therefore, lower suction pressure
drop in the flooded design will impose less
capacity penalty on the compressor and this
will further enable the compressor in a flooded
evaporator to generate more capacity than one
with a DX Evaporator.
Figure 1 shows the typical screw compressor
capacity performance curve at a particular
condensing temperature over saturated
evaporating temperature of between 30°F
[-1.1°C] to 50°F [10°C], and the typical power
input curve over the same conditions. It can be
noted that the same compressor when
operating with a flooded evaporator will
generate approximately 8% more cooling
capacity while kW input increases by approx
1.8%. Therefore, the same compressor, when
coupled to a flooded evaporator, will typically
achieve higher cooling capacity with
-3-
ADVANTAGES OF FLOODED CHILLER
2. Better Part Load Performance
5. Maximum Reliability and Redundancy
Today, the Dunham-Bush screw compressors
are increasingly accepted for its reliability. The
2-compressor,
3-compressor
and
4compressor models are designed to have 2
independent
refrigerant
circuits
for
redundancy. For the refrigerant circuits with 2compressors (i.e. 3-compressor and 4compressor models), individual compressor is
provided with suction stop valve, suction check
valve, discharge check valve and other
isolating valves in the oil management system
to allow complete isolation of an unlikely faulty
compressor
without
contaminating
the
refrigerant system and further allows other
compressors to continue to operate - thus
ensuring maximum redundancy
The Dunham-Bush Air Cooled Flooded Chiller
with its sophisticated advanced controller and
patented oil management system has all
evaporator tubes completely immersed in the
“boiling” liquid refrigerant to achieve superior
heat transfer efficiency while ensuring
adequate oil return to the compressor(s). This
ensures superior full-load efficiency and even
better part-load efficiency as the full heat
transfer surface areas of the evaporator tubes
are utilized even at part-load conditions. In
Direct Expansion Evaporators, because of the
need to maintain adequate refrigerant gas
velocities in the evaporator tubes for proper oil
return, it is typical for certain bundles of
evaporator tubes to be “blocked” or “baffled
off” at part-load conditions. Therefore not
utilizing the full heat transfer surface of the
evaporator tubes means lower efficiency when
compared with a flooded evaporator chiller at
part-load conditions.
6. Cleanable Evaporator
For a single pass evaporator join in a row, the
end plates at both ends of the water boxes (2
pass only at return end and 1 pass ‘u’
arrangement only at ‘u’ elbow end) can be
removed easily without dismantling the chilled
water piping connections, for inspection and
for mechanical tubes cleaning with brushes or
auto-brush. This will enable low tube fouling
factor in the evaporator to be ensured, thus
maintaining system efficiency.
3. Flash Economizer/ Vapor Injection
Cycle for Increase Capacity and Higher
EER
The
renowned
Dunham-Bush
screw
compressor allows for flash economizer vapor
injection cycle to be incorporated, increasing
capacity by as much as 25% with marginal
10% to 15% increase in kW-input. Most of
Dunham-Bush’s competitors who produce
Rotary Screw Chillers do not incorporate flasheconomizer vapor injection cycle- not to
mention flooded evaporator!
4. Excellent Capacity Modulation
Response to Building Loads
7. Lower Water Side Pressure Drop
In a DX Evaporator, the water flows
transversely over the outside of the tubes. The
water flow is guided with vertical baffles. This
will have a higher-pressure drop compared to
the water flow in the tubes of a flooded
evaporator. In other words, the equivalent
flooded chiller will require smaller water pump
to operate at lower power consumption.
in
Dunham-Bush utilizes its state-of-the-art
advanced
controller
in
combination
with the electronic level controller and
modulating motor actuated ball valves to
ensure precise control of liquid refrigerant to
the flooded evaporator in response to changes
in cooling load. While maintaining leaving
chilled water temperatures even at very low
load. Whereas most of Dunham-Bush’s
competitors utilize orifice plates to modulate
refrigerant feed to the evaporator, resulting in
lower efficiency at low-load and less reliable oil
return.
8. Commonly Used In Large Tonnage
Chillers Where Efficiency Is Critical
As a general rule, DX Evaporators are typically
used in small and medium tonnage chillers
where efficiency may not be a primary
consideration but cost is important. However,
with increasing energy cost and the drive to
reduce global warming, flooded evaporator
chillers will increasingly become more
popular not only in the large tonnage
chillers but also in the small and medium
tonnage chillers. Dunham-Bush, again,
leads the industry in this respect!
-4-
UNIT FEATURES
with the controller through a telephone cable. The
terminal allows carrying out of all program
operations and also allows the unit working
conditions, compressor run times and alarm
history to be displayed. Set points and other
parameters can be modified via the user terminal.
The display has an automatic self-test of the
controller on system start-up. Multiple messages
will be displayed automatically by scrolling from
each message to the next. All of these messages
are spelled out in English on the display terminal.
There are 15 dedicated buttons to enable the user
to access information, based on the security level
of the password. For more detail operation of the
DBG1 Display Terminal, please refer to the Unit
Operation Manual.
Easily accessible measurements include:
D Leaving chilled water temperature
D Entering chilled water temperature
D Compressor discharge temperature
D Leaving chiller water temperature derivative
D Evaporator Pressure
D Condenser Pressure
D Compressor amp draw of each compressor
D Compressor elapsed run time of each
compressor
D Compressor starts status
D Oil level sensor status
D Water temperature reset value
D Water flow switch status
D External start/stop command status
ADVANCE CONTROLLER
Vision
2020i
a
flexible
and
advance
programmable electronic controller designed
specifically for the application and precise control
of Dunham-Bush Rotary Screw compressor
chillers.
The controller board is provided with a set of
terminals that connect to various devices such as
temperature sensors, pressure and current
transducers, solenoid valves, compressors and
fans contactors, control relays etc. Three sizes of
controller boards are provided to handle different
number of input and output requirements: DB3-S
small, DB3-M medium and DB3-L large board.
The unit algorithm program and operating
parameters are stored in FLASH-MEMORY that
does not require a back-up battery. The program
can be loaded through PC or programming key.
Optional ambient temperature is available. With
this option the operator can quickly and
accurately read all significant temperatures and
eliminate the need for thermometers. Voltmeter is
also offered as an optional feature.
Vision 2020i controller is equipped with a user
friendly terminal with a semi-graphic display and
dedicated keys that provides easy access to the
unit operating conditions, control set points and
alarm history.
Capacity Control
Leaving chilled water temperature control is
accomplished by entering the water temperature
setpoint and placing the controller in automatic
control. The unit will monitor all control functions
and move the slide valve to the required operating
position. The compressor ramp (loading) cycle is
programmable and may be set for specific
building requirements. Remote adjustment of the
leaving chilled water setpoint is accomplished
either through direct BMS protocols connection to
Each unit’s controller can be configured and
connected to the local DBLAN network that allows
multiple units sequencing control without
additional hardware. The DBLAN is local area
network made up of several chillers’ controller.
Display and User Terminal
The Vision 2020i controller is designed to work
with a user friendly back-lit 132 by 64 pixels
DBG1 Semi-Graphic Display panel connected
-5-
UNIT FEATURES
controlled from a PC terminal and optional phone
modem.
the controller communication ports, or from an
external hardwired control signal from BMS to
supply a chilled water reset 4 to 20mA analog
input signal. Remote reset of compressor current
limiting function may be accomplished in a similar
fashion.
With various optional add-on cards the
Vision2020i controller can also be interfaced
directly to the Building Management System
(BMS) with the standard communication protocols
using MODBUS, LONWORKS, BACNET MSTP
as well as over IP.
System Control
The unit may be started or stopped manually, or
through the use of an external signal from a
Building Automation System. In addition, the
controller may be programmed with seven-day
operating cycle or other Dunham-Bush control
packages may start and stop the system through
inter-connecting wiring.
This sophisticated feature makes servicing easier
and more convenient to the system. The
controller as standard is additionally equipped
with history files which can be used to take logs
and which may be retrieved via the phone modem
or internet connection periodically. Now owners of
multiple buildings have a simple and inexpensive
method of investigating potential problems quickly
and in a highly cost effective manner.
System Protection
The following system protection controls will
automatically act to ensure system reliability:
REFRIGERATION CYCLE
D Low suction pressure
The refrigerant management system, is shown in
the refrigerant cycle diagram below.
D High discharge pressure
D Freeze protection
Liquid refrigerant enters the flooded evaporator
uniformly where it absorbs heat from water
flowing through the evaporator tubes. The
vaporized refrigerant is then drawn into the
suction port of the compressor where the
compression begins.
D Low differential pressure
D Low oil level
D Compressor run error
D Power loss
D Chilled water flow loss
D Sensor error
This partially compressed gas is then combined
with additional gas from the flash economizer as
the vapor injection port at an intermediate
pressure is exposed to each interlobe space.
Compressed gaseous refrigerant is then
discharged into the integral oil separator where
oil, which is contained in the refrigerant vapor, is
removed and returned to the oil sump.
D Compressor over current
D Compressor Anti-recycle
The controller can retain up to 99 alarm
conditions complete with time of failure together
data stamping on critical sensor readings in an
alarm history. This tool will aid service technicians
in troubleshooting tasks enabling downtime and
nuisance trip-outs to be minimized.
High pressure superheated refrigerant is then
discharged into the condenser, where air is drawn
across the condenser by propeller fans which cool
and condense the refrigerant. This liquid
refrigerant then passes through the first
expansion device and into the flash economizer
where flash gas and liquid refrigerant are
separated.
Remote Monitoring
Vision 2020i controller can be completed with an
optional RS485 communications card and
NETVISOR software for remote monitoring and
-6-
UNIT FEATURES
Bush air cooled chillers have some of the best
part-load performance characteristics in the
industry when measured in accordance with AHRI
Standard 550/590-2003.
The flash gas is drawn into the vapor injection port
of the compressor. The remaining liquid
refrigerant then passes through a second
expansion device which reduces the pressure
further and it is introduced into the bottom of the
flooded evaporator via an integral distributor.
In most cases, actual building system loads are
significantly less than full load design conditions,
therefore chillers operate at part load most of the
time.
By removing the flash gas from the flash
economizer at an intermediate pressure, the
enthalpy of the refrigerant flowing into the
evaporator is reduced. This increases the
refrigeration effect and improves the efficiency of
the refrigeration cycle.
Dunham-Bush air cooled chillers combine the
efficient operation of multiple compressors with an
economizer cycle and advanced controller to yield
the best total energy efficiency and significant
operating saving under any load.
Refrigerant flow into and out of the flash
economizer is controlled by modulating valves
which eliminate the energy wasting hot gas
bypass effect inherent with fixed orifices.
When specifying air conditioning equipment, it is
important to consider the system load
characteristics for the building application. In a
typical city, the air conditioning load will vary
according to changes in the ambient temperature.
Weather data compiled over many years will
predict the number of hours that equipment will
operate at various load percentages.
PART-LOAD PERFORMANCE
Through the use of flash economizer modulating
flow control and multiple compressors, Dunham-
-7-
OPERATING BENEFITS
EFFICIENCY AND RELIABILITY
D IEEE.
D Safety quality license for import boiler and
Energy Efficiency
pressure vessel, China.
D Designed to provide the greatest amount of
cooling for the least power input over the entire
operating range of your building.
Refrigerant Compatibility
D Designed
to operate with environmentally
sound and economically smart HFC-134a with
proven efficiency and reliability.
D Delivers
outstanding efficiency and total
energy savings through the utilization of
economizer cycle and advanced controller
staging producing greater capacity with fewer
compressors.
D Consult
Factory
refrigerants.
for
use
of
other
HFC
D Maximized performance through computer-
Control Flexibility
matched
components
and
multiple
compressors on a single refrigerant circuit.
D Controller-based
with DDC (direct digital
control) features precise push button control
over every aspect of operation with built-in
standard features that allow extra energy
savings on start-up and throughout the life of
your equipment.
D High efficiency oil recovery system guarantees
removal of oil carried over in the refrigerant
and maintains the heat exchangers at their
maximum efficiency at both full and part load.
D Ensured
uniform compressor loading and
optimal energy efficiency through controller to
controls which utilize pressure transducers to
measure evaporator and condenser pressure.
Operational Advantages
D Dramatic payback in reduced maintenance
and overhaul costs both in downtime and in
labor expenditures.
D Lower energy costs resulting from automatic
D Ease of troubleshooting through controller
load monitoring and increased accuracy and
efficiency in compressor staging.
retention of monitored functions.
D Factory run tested.
D Monitor your chiller's key functions from a
remote location with a simple, low cost, phone
modem option.
Safety Code
D ASME Boiler and Pressure Vessel Code,
D Proactive control anticipates problems and
Section VIII Division 1 "Unfired Pressure
Vessels".
takes corrective action before they occur.
Controls will unload compressor(s) if head or
suction pressure approach limits. This will
enable unit to stay on line while warning
operator of potential problems.
D JKKP Code.
D ASME Standard B31.5 Refrigeration Piping.
D ASHRAE
Standard 15
Mechanical Refrigeration.
Safety
Code
for
-8-
TYPICAL SEQUENCE OF OPERATION
The Dunham-Bush air cooled water chiller
depends mainly on its on-board controller for
control. Operation described is for a twocompressor units and is very similar for single
compressor units.
match applied load and hold leaving chilled water
temperature at setpoint.
If the applied load is greater than one compressor
can handle, it will load fully and then the controller
will call for a second compressor. After one
minute, the second compressor will start in the
same manner as the first. Then both compressors
will be commanded to adjust load to 50%. They
are gradually loaded up together until the applied
load is satisfied. In this way the two compressors
share the load equally.
For initial start-up, the following conditions must
be met:
D Power supply to unit energized.
D Unit circuit breakers in the ‘on’ position.
D Control power switch ‘on’ for at least 15
minutes. Compressor switches ‘on’.
If the applied load decreases to the point that both
compressors are running at about 40% capacity,
the computer shuts down the lag compressor and
loads the remaining compressor to about 80%. If
applied load decreases further, the remaining
compressor unloads proportionately. If applied
load decreases to less than the minimum capacity
of one compressor, the leaving chilled water
temperature will decline to 2°F [1.1°C] below
setpoint, at which time the lead compressor will
shut down. It will restart automatically if leaving
chilled water temperature rises to 2°F [1.1°C]
above setpoint and both 15 minute anti-recycle
and one minute start delay timers are satisfied.
D Reset pressed on controller keypad.
D Chilled water pump running and chilled water
flow switch made.
D Leaving chilled water temperature at least 2°F
[1.1°C] above setpoint.
D All safety conditions satisfied.
After all above conditions are met, the controller
will call for the lead compressor to start. The
compressor 15-minute anti-recycle timer is
initiated at compressor start.
The controller monitors compressor amps, volts,
leaving water temperature and suction and
discharge pressures. The compressor and cooling
capacity is controlled by pulsed signals to load
and unload solenoid valves on the compressor.
When the compressor starts, it is fully unloaded,
reducing about 25% of its full load capacity. As
the computer gives it load signals, capacity
gradually increases. The rate of compressor
loading is governed by ramp control which is
adjustable in the computer.
During start-up operation, the computer monitors
the difference between discharge and suction
pressures to ensure that minimum of 30psi
[2bar] differential is available for compressor
lubrication. If the difference falls below a minimum
of 30psi [2bar], the computer closes refrigerant
flow control valves, starving the evaporator,
causing evaporator pressure to drop, increasing
differential pressure. This is especially helpful at
startup, when warm chilled water and low ambient
temperature would cause a low head situation.
This feature is called EPCAS: Evaporator
Pressure Control at Startup. It is one of several
proactive control features of the controller which
overcome potential problems while continuing
operation.
The computer responds to leaving chilled water
temperature and its rate of change which is
proportional and derivative control. If leaving
chilled water temperature is within the deadband
(+/-0.8°F [0.5°C] from setpoint), no load or unload
commands are given. If chilled water temperature
is above deadband, the computer will continue
loading the compressor until a satisfactory rate of
decline is observed. If leaving chilled water
temperature is below the deadband, the
compressor is commanded to unload. Thus the
compressor capacity is continuously modulated to
Two additional proactive features are low suction
and high discharge pressure override. If operating
pressures approach trip level, compressors are
unloaded as necessary to continue operation.
-9-
APPLICATION DATA
USgal [11 liters] for process, low load applications
with small temperature ranges and/or vastly
fluctuating load conditions.
Low Ambient Operation / Freeze
Protection
If unit is required to operate below 20°F [-7°C],
optional head pressure control is required.
Immersion heater and circulating pump need to
be provided to be in operation when the chiller is
not operating. Glycol is recommended for added
protection. If wind in area is over 5 mph [8 kph], a
wind barrier is recommended.
Glycol Freeze Protection
If the chiller or fluid piping may be exposed to
temperatures below freezing, glycol protection is
recommended. The re-commended protection is
10°F [5.6°C] below the minimum ambient
temperature. Use only glycol solutions approved
for heat exchanger duty. The use of automotive
anti-freeze is not recommended because they
have short-lived inhibitors and fouling of the
vessels will occur. If the equipment is exposed to
freezing temperature and not being used, the
vessels and piping should be drained.
The use of glycol causes a performance derate as
shown below which needs to be included in the
unit selection procedure.
Desuperheaters
A hot gas desuperheater can be factory supplied
for field installation. Suitable fittings in refrigerant
lines with shut off valves can be supplied. Consult
factory for further details.
Water Circuit
Constant water flow required with a minimum of 3
USgal per TR [3.3 liters / kW°] increasing up to 10
Ethylene Glycol
Freeze Point
% E. G.
By Weight
°F
°C
C1
Capacity Factor
K1
kW Rate
G1
Flow Factor
P1
P.D. Factor
10
26.2
-3.2
0.995
0.998
1.019
1.050
15
22.4
-5.3
0.991
0.997
1.030
1.083
20
17.8
-7.9
0.988
0.996
1.044
1.121
25
12.6
-10.8
0.984
0.995
1.060
1.170
30
6.7
-14.1
0.981
0.994
1.077
1.219
35
0.0
-17.8
0.977
0.992
1.097
1.275
40
-10.0
-23.3
0.973
0.991
1.116
1.331
45
-17.5
-27.5
0.968
0.990
1.138
1.398
50
-28.9
-33.8
0.964
0.989
1.161
1.466
Propylene Glycol
Freeze Point
% P. G.
By Weight
°F
°C
C2
Capacity Factor
K2
kW Rate
G2
Flow Factor
P2
P. D. Factor
10
26.1
-3.3
0.988
0.994
1.005
1.019
15
22.8
-5.1
0.984
0.992
1.008
1.031
20
19.1
-7.2
0.978
0.990
1.010
1.051
25
14.5
-9.7
0.970
0.988
1.015
1.081
30
8.9
-12.8
0.962
0.986
1.021
1.120
Correction Factor - Elevation
Meters Factor
Capacity
Correction
Factor
kW
Correction
Factor
hr.ft².°F/BTU
Elevation above Sea Level
Feet
Correction Factor - FF
m².°C/kW
Capacity
Correction
Factor
kW
Correction
Factor
Fouling Factor
0
0
1.00
1.00
0.00010
0.018
1.000
1.000
2000
600
0.99
1.01
0.00025
0.044
0.990
0.995
4000
1200
0.98
1.02
0.00050
0.088
0.970
0.990
6000
1800
0.97
1.03
- 10 -
PHYSICAL SPECIFICATIONS
Model AFHX
Unit Nominal Capacity
TR[kW]
Unit Nominal Power Input
kW
75-6SR
80T-6SR
90T-6SR
100-6SR
115-6SR
70 [246]
74 [260]
84 [295]
88 [311]
103 [362]
86
92
104
110
128
COMPRESSOR
Model (Qty)
HX 1512 (1)
HX 1309 (2)
HX 1311 (2)
HX 1709 (1)
HX 1711 (1)
RPM
3550
3550
3550
3550
3550
Min. % Unit Capacity
25%
12.5%
12.5%
25%
25%
EVAPORATOR
Model (Qty)
B1R (1)
B1R (1)
C1R (1)
C1R (1)
D1R (1)
5 [127]
5 [127]
5 [127]
5 [127]
6 [152]
Nominal Water Flow / Pressure Drop
USgpm/ ft.wg[m³/hr/ kPa]
168.7/ 9.3
[38.3/ 27.8]
177.3/ 10.2
[40.3/ 30.5]
201.2/ 8.4
[45.7/ 25.1]
212.3/ 9.3
[48.2/ 27.8]
247.1/ 7.4
[56.1/ 22.1]
Min/ Max Water Flow
63.0/ 313.0
[14.3/ 71.1]
63.0/ 313.0
[14.3/ 71.1]
79.0/ 396.5
[17.9/ 90.0]
79.0/ 396.5
[17.9/ 90.0]
105.0/ 523.0
[23.8/ 118.7]
1.6/ 28.3
[4.8/ 84.6]
1.6/ 28.3
[4.8/ 84.6]
1.6/ 28.7
[4.8/ 85.8]
1.6/ 28.7
[4.8/ 85.8]
1.6/ 28.5
[4.8/ 85.2]
Water Connector
inches[mm]
USgpm[m³/hr]
Min/ Max Water Pressure Drop
ft.wg[kPa]
CONDENSER
Coil Rows Deep/ Total Face Area
ft²[m²]
3/ 121.9 [11.3]
3/ 121.9 [11.3]
4/ 121.9 [11.3]
4/ 121.9 [11.3]
4/ 162.6 [15.1]
6
6
6
6
8
31.5 [800](6)
31.5 [800](6)
31.5 [800](6)
31.5 [800](6)
31.5 [800](8)
Motor kWi (Qty)
2(6)
2(6)
2(6)
2(6)
2(8)
FLA, AMP (Qty)
3.8(6)
3.8(6)
3.8(6)
3.8(6)
3.8(8)
cfm[m³/hr]
76734
[130386]
74466
[126532]
72954
[123963]
72954
[123963]
101304
[172136]
°F[°C]
45 [7.2]
45 [7.2]
45 [7.2]
45 [7.2]
45 [7.2]
No. Of Fan
Fan Diameter (Qty)
Total Air Flow
Min. Operating Ambient
inches[mm]
ELECTRICAL
Nominal Voltage
460/3/60
460/3/60
460/3/60
460/3/60
460/3/60
Unit RLA
A
140
151
167
173
200
Unit Max. Inrush
A
231
195
203
266
312
GENERAL
Unit Length
inches[mm]
150 [3810]
150 [3810]
150 [3810]
150 [3810]
192 [4877]
Unit Width
inches[mm]
88 [2235]
88 [2235]
88 [2235]
88 [2235]
88 [2235]
Unit Height
inches[mm]
87.5 [2222]
87.5 [2222]
87.5 [2222]
87.5 [2222]
87.5 [2222]
Shipping Weight
lbs[kg]
8526 [3867]
9063 [4111]
9601 [4355]
9322 [4228]
10919 [4953]
Operating Weight
lbs[kg]
8641 [3920]
9179 [4164]
9749 [4422]
9470 [4295]
11112 [5040]
Operating Charge R134a
lbs[kg]
205 [93]
216 [98]
245 [111]
260 [118]
302 [137]
Note: Nominal capacity is based on evaporator LWT 44°F and condenser ambient 95°F, actual capacity depends on the specified operating
conditions.
- 11 -
PHYSICAL SPECIFICATIONS
Model AFHX
Unit Nominal Capacity
TR [kW]
Unit Nominal Power Input
kW
125T-6SR
135-6SR
150-6SR
150T-6SR
175T-6SR
190-6SR
110 [387]
121 [427]
132 [466]
137 [482]
158 [556]
171 [603]
138
150
162
172
192
213
COMPRESSOR
Model (Qty)
RPM
Min. % Unit Capacity
HX 1509 (2)
HX 1811 (1)
HX 1813 (1)
HX 1512 (2)
HX 1709 (1)
HX 1512 (1)
HX 1816 (1)
3550
3550
3550
3550
3550
3550
12.5%
25%
25%
12.5%
12.5%
25%
EVAPORATOR
Model (Qty)
D2R (1)
D2R (1)
J1R (1)
J1R (1)
K1R (1)
K2R (1)
6 [152]
6 [152]
6 [152]
6 [152]
6 [152]
6 [152]
Nominal Water Flow / Pressure Drop
USgpm / ft.wg [m³/hr / kPa]
264.3/ 6.8
[60.0/ 20.3]
291.6/ 8.1
[66.2/ 24.2]
318.0/ 11.2
[72.2/ 33.5]
329.3/ 11.9
[74.8/ 35.6]
380.1/ 13.3
[86.3/ 39.8]
411.7/ 13.0
[93.5/ 38.9]
Min/ Max Water Flow
117.0/ 587.0
[26.6/ 133.2]
117.0/ 587.0
[26.6/ 133.2]
117.0/ 588.0
[26.6/ 133.4]
117.0/ 588.0
[26.6/ 133.4]
128.0/ 640.0
[29.1/ 145.3]
142.0/ 705.0
[32.2/ 160.0]
1.6/ 28.8
[4.8/ 86.1]
1.6/ 28.8
[4.8/ 86.1]
1.9/ 33.8
[5.7/ 101.1]
1.9/ 33.8
[5.7/ 101.1]
1.9/ 33.9
[5.7/ 101.4]
1.9/ 34.3
[5.7/ 102.6]
Water Connector
inches[mm]
USgpm[m³/hr]
Min/ Max Water Pressure Drop
ft.wg[kPa]
CONDENSER
Coil Rows Deep/ Total Face Area
ft²[m²]
4/ 162.6 [15.1]
4/ 162.6 [15.1]
4/ 188.2 [17.5]
4/ 188.2 [17.5]
4/ 235.3 [21.9]
4/ 235.3 [21.9]
8
8
8
8
10
10
31.5 [800](8)
31.5 [800](8)
31.5 [800](8)
31.5 [800](8)
31.5 [800](10)
31.5 [800](10)
Motor kWi (Qty)
2(8)
2(8)
2(8)
2(8)
2(10)
2(10)
FLA, AMP (Qty)
3.8(8)
3.8(8)
3.8(8)
3.8(8)
3.8(10)
3.8(10)
cfm[m³/hr]
97272
[165285]
97272
[165285]
103236
[175419]
101388
[172278]
126735
[215348]
129045
[219273]
°F[°C]
45 [7.2]
45 [7.2]
45 [7.2]
45 [7.2]
45 [7.2]
45 [7.2]
No. Of Fan
Fan Diameter (Qty)
Total Air Flow
Min. Operating Ambient
inches[mm]
ELECTRICAL
Nominal Voltage
460/3/60
460/3/60
460/3/60
460/3/60
460/3/60
460/3/60
Unit RLA
A
224
229
243
264
335
319
Unit Max. Inrush
A
294
335
497
356
426
536
GENERAL
Unit Length
inches[mm]
192 [4877]
192 [4877]
202.5 [5144]
192 [4877]
234 [5944]
234 [5944]
Unit Width
inches[mm]
88 [2235]
88 [2235]
88 [2235]
88 [2235]
88 [2235]
88 [2235]
Unit Height
inches[mm]
87.5 [2222]
87.5 [2222]
96.5 [2451]
96.5 [2451]
96.5 [2451]
96.5 [2451]
Shipping Weight
lbs[kg]
12034 [5458]
11495 [5214]
12329 [5593]
12896 [5850]
15361 [6968]
14579 [6613]
Operating Weight
lbs[kg]
12246 [5555]
11708 [5311]
12581 [5707]
13148 [5964]
15641 [7095]
14882 [6750]
Operating Charge R134a
lbs[kg]
322 [146]
355 [161]
388 [176]
401 [182]
483 [219]
522 [237]
Note: Nominal capacity is based on evaporator LWT 44°F and condenser ambient 95°F, actual capacity depends on the specified operating
conditions.
- 12 -
PERFORMANCE DATA
Ambient Temperature, °F
LWT
°F
Model
AFHX
40.0
42.0
44.0
Notes:
1.)
2.)
3.)
4.)
85.0
95.0
105.0
115.0
TR
kW°
kWI
TR
kW°
kWI
TR
kW°
kWI
TR
kW°
kWI
75-6SR
67.7
238.0
63.2
65.0
228.4
72.8
61.6
216.5
84.9
57.3
201.3
100.2
80T-6SR
70.5
247.9
68.7
68.2
240.0
79.0
65.0
228.4
92.0
60.6
213.2
108.3
90T-6SR
80.7
283.6
78.4
77.5
272.4
90.6
73.3
257.9
105.5
68.2
239.7
125.5
100-6SR
85.5
300.8
83.9
81.7
287.3
97.0
77.2
271.4
113.4
71.7
252.2
135.1
115-6SR
99.3
349.1
95.6
95.1
334.6
110.3
90.0
316.4
128.8
83.7
294.2
153.3
125T-6SR
106.0
372.9
104.4
101.7
357.7
120.3
96.4
338.9
140.3
89.6
315.1
166.7
135-6SR
117.5
413.2
114.3
112.1
394.4
132.2
105.8
372.2
154.8
98.2
345.5
184.6
150-6SR
128.3
451.3
124.5
122.4
430.4
144.7
115.3
405.7
169.2
106.9
375.9
202.4
150T-6SR
132.7
466.8
132.5
126.7
445.6
153.5
119.4
419.9
180.0
110.6
389.1
215.9
175T-6SR
152.8
537.5
147.3
146.4
514.7
169.9
138.4
486.6
198.6
128.8
452.9
236.4
190-6SR
166.1
584.2
165.1
158.3
556.7
190.7
149.1
524.3
225.5
137.7
484.3
270.2
75-6SR
70.3
247.3
63.3
67.5
237.4
73.0
64.1
225.5
85.0
59.8
210.2
100.3
80T-6SR
73.2
257.5
69.1
71.0
249.6
79.2
67.6
237.7
92.3
63.3
222.5
108.5
90T-6SR
83.9
294.9
78.8
80.6
283.3
90.8
76.3
268.5
105.9
71.2
250.3
125.5
100-6SR
88.8
312.4
84.3
85.0
298.9
97.3
80.4
282.7
113.9
74.9
263.5
135.0
115-6SR
103.1
362.7
96.0
98.9
347.8
110.7
93.7
329.6
129.5
87.3
307.1
153.4
125T-6SR
110.1
387.1
104.8
105.8
371.9
120.7
100.4
353.1
140.7
93.5
328.9
166.8
135-6SR
122.0
429.1
114.8
116.7
410.3
132.7
110.3
387.8
155.6
102.6
360.7
184.5
150-6SR
133.3
468.8
125.0
127.3
447.6
144.7
120.1
422.5
169.8
111.7
392.7
202.7
150T-6SR
137.9
485.0
133.1
131.8
463.5
154.0
124.4
437.4
180.6
115.6
406.6
215.5
175T-6SR
158.8
558.4
147.8
152.2
535.3
170.5
144.1
506.8
199.6
134.4
472.8
235.6
190-6SR
172.6
607.0
165.8
164.7
579.2
190.7
155.4
546.5
226.6
143.9
506.1
270.4
75-6SR
73.0
256.9
63.4
70.2
247.0
73.6
66.7
234.7
86.0
62.4
219.5
100.4
80T-6SR
76.1
267.5
69.3
73.8
259.5
79.9
70.3
247.3
92.9
66.0
232.1
108.8
90T-6SR
87.0
306.1
79.0
83.8
294.5
91.6
79.5
279.7
106.3
74.3
261.2
125.3
100-6SR
92.2
324.3
84.4
88.4
310.8
98.2
83.8
294.5
114.2
78.2
275.1
136.0
115-6SR
107.1
376.6
96.1
102.8
361.7
111.7
97.6
343.2
129.9
91.2
320.7
153.1
125T-6SR
114.3
402.0
105.0
110.0
386.8
121.8
104.5
367.6
141.0
97.7
343.5
166.5
135-6SR
126.7
445.6
114.9
121.4
426.8
133.8
115.0
404.3
155.5
107.2
376.9
185.3
150-6SR
138.5
487.0
125.7
132.4
465.5
146.5
125.3
440.7
170.1
116.7
410.3
203.1
150T-6SR
143.3
503.8
133.9
137.1
482.0
156.0
129.6
455.9
181.0
120.8
424.8
216.5
175T-6SR
164.9
579.9
148.0
158.2
556.4
172.0
150.1
528.0
200.3
140.3
493.6
236.8
190-6SR
179.3
630.5
166.5
171.4
602.7
192.9
162.0
569.6
227.5
150.4
529.0
270.8
Ratings based on 10°F water range in evaporator and .0001 hr.ft².°F/BTU fouling factor.
Interpolation between ratings is permissible but extrapolation is NOT.
kWI is for compressor input.
Unit is running on part load for ambient temperature 115°F and above due to current limiter.
- 13 -
PERFORMANCE DATA
Ambient Temperature, °F
LWT
°F
Model
AFHX
85.0
TR
46.0
48.0
50.0
Notes:
1.)
2.)
3.)
4.)
95.0
kW°
kWI
TR
105.0
kW°
kWI
TR
115.0
kW°
kWI
TR
kW°
kWI
75-6SR
75.8
266.4
63.8
72.9
256.5
74.0
69.5
244.3
85.9
65.1
228.8
101.3
80T-6SR
79.0
277.7
69.3
76.6
269.4
80.3
73.1
257.2
92.9
68.7
241.7
109.0
90T-6SR
90.3
317.7
79.4
87.0
305.8
92.0
82.8
291.2
106.5
77.5
272.4
125.9
100-6SR
95.8
336.9
84.9
91.8
323.0
98.6
87.2
306.8
114.9
81.6
287.0
135.8
115-6SR
111.2
391.1
96.6
106.9
375.9
112.1
101.6
357.4
130.5
95.1
334.6
153.8
125T-6SR
118.6
417.2
105.5
114.2
401.7
122.4
108.8
382.5
141.4
101.8
358.0
167.2
135-6SR
131.6
462.8
115.5
126.1
443.3
134.4
119.6
420.5
156.9
111.8
393.1
184.8
150-6SR
143.7
505.5
125.8
137.6
484.0
146.8
130.4
458.5
171.1
121.7
428.1
202.3
150T-6SR
148.8
523.3
134.1
142.4
500.9
156.2
135.0
474.7
182.0
126.0
443.0
215.7
175T-6SR
171.2
602.0
148.9
164.4
578.2
172.9
156.2
549.5
200.3
146.3
514.4
237.1
190-6SR
186.1
654.6
167.4
178.1
626.5
192.0
168.6
593.1
228.2
157.0
552.1
270.1
75-6SR
78.6
276.4
64.0
75.6
265.8
74.0
72.1
253.6
86.6
67.6
237.7
101.9
80T-6SR
81.8
287.6
69.8
79.4
279.4
80.3
76.0
267.1
93.7
71.4
251.3
110.4
90T-6SR
93.6
329.3
79.9
90.2
317.1
92.2
85.9
302.2
107.5
80.5
283.0
126.5
100-6SR
99.3
349.1
85.6
95.2
334.9
98.9
90.5
318.4
115.7
84.8
298.2
136.3
115-6SR
115.2
405.3
97.5
110.8
389.8
112.3
105.5
370.9
131.2
98.8
347.4
154.4
125T-6SR
123.1
432.8
106.3
118.4
416.6
122.4
112.9
397.0
143.4
105.8
371.9
168.6
135-6SR
136.4
479.7
117.1
130.8
459.8
135.0
124.2
436.7
158.0
116.2
408.6
186.7
150-6SR
149.0
524.0
127.5
142.8
502.2
147.1
135.4
476.1
172.4
126.6
445.3
204.3
150T-6SR
154.3
542.5
135.6
147.8
519.7
156.6
140.2
492.9
183.3
131.0
460.9
217.9
175T-6SR
177.5
624.2
150.0
170.5
599.7
173.1
162.2
570.3
202.3
152.0
534.6
238.0
190-6SR
193.0
678.7
168.8
184.8
649.9
193.5
175.1
615.9
229.8
163.4
574.6
273.1
75-6SR
81.5
286.6
64.6
78.5
276.0
74.2
74.9
263.5
86.8
70.3
247.3
102.0
80T-6SR
84.9
298.5
70.2
82.4
289.9
80.7
78.9
277.4
94.1
74.3
261.2
110.6
90T-6SR
97.1
341.5
80.7
93.6
329.3
92.5
89.3
314.1
108.1
83.8
294.5
127.3
100-6SR
103.0
362.3
86.2
98.9
347.8
99.0
94.1
330.9
116.3
88.4
310.8
137.0
115-6SR
119.6
420.5
98.2
115.1
404.7
112.9
109.6
385.5
132.0
102.9
362.0
154.9
125T-6SR
127.6
448.6
107.3
123.0
432.4
122.8
117.3
412.6
143.8
110.1
387.1
168.6
135-6SR
141.5
497.5
117.4
135.8
477.7
135.4
129.1
453.9
158.9
121.1
425.8
187.1
150-6SR
154.6
543.8
127.9
148.3
521.7
147.8
140.8
495.2
174.2
132.0
464.2
205.0
150T-6SR
160.0
562.7
136.0
153.5
539.9
157.1
145.7
512.4
185.5
136.6
480.4
218.4
175T-6SR
184.1
647.3
151.3
177.1
622.9
174.1
168.5
592.8
203.5
158.4
557.1
239.3
190-6SR
200.2
704.2
169.3
192.0
675.1
195.0
182.2
640.7
231.7
170.3
599.1
273.4
Ratings based on 10°F water range in evaporator and .0001 hr.ft².°F/BTU fouling factor.
Interpolation between ratings is permissible but extrapolation is NOT.
kWI is for compressor input.
Unit is running on part load for ambient temperature 115°F and above due to current limiter.
- 14 -
DIMENSIONAL DATA
AFHX 75-6SR, 100-6SR
AFHX 80T-6SR, 90T-6SR
AFHX 115-6SR, 135-6SR
Note : All dimensions are in inches[mm].
- 15 -
DIMENSIONAL DATA
AFHX 125T-6SR, 150T-6SR
AFHX 150-6SR
Note : All dimensions are in inches[mm].
- 16 -
DIMENSIONAL DATA
AFHX 175T-6SR
AFHX 190-6SR
Note : All dimensions are in inches[mm].
- 17 -
FLOOR LOADING DIAGRAM
a.) POINT LOAD LOCATION – inches[mm]
Model AFHX
A Dim.
B Dim.
C Dim.
D Dim.
E Dim.
75-6SR
86[2184]
18[457]
57[1448]
57[1448]
18[457]
80T-6SR
86[2184]
18[457]
57[1448]
57[1448]
18[457]
90T-6SR
86[2184]
18[457]
57[1448]
57[1448]
18[457]
100-6SR
86[2184]
18[457]
57[1448]
57[1448]
18[457]
18[457]
115-6SR
86[2184]
18[457]
78[1981]
78[1981]
125T-6SR
86[2184]
18[457]
78[1981]
78[1981]
18[457]
135-6SR
86[2184]
18[457]
78[1981]
78[1981]
18[457]
150-6SR
86[2184]
18[457]
83-1/4[2115]
83-1/4[2115]
18[457]
150T-6SR
86[2184]
18[457]
78[1981]
78[1981]
18[457]
175T-6SR
86[2184]
18[457]
99[2515]
99[2515]
18[457]
190-6SR
86[2184]
18[457]
99[2515]
99[2515]
18[457]
b.) POINT LOAD DATA – lbs [kg]
Model
AFHX
Pos.
#1
Pos.
#2
Pos.
#3
Pos.
#4
Pos.
#5
Pos.
#6
Total Operating
Weight
75-6SR
1297 [588]
1464 [664]
1630 [739]
1465 [665]
1416 [642]
1368 [621]
8641 [3919]
80T-6SR
1633 [741]
1578 [716]
1523 [691]
1462 [663]
1482 [672]
1501 [681]
9179 [4164]
90T-6SR
1737 [788]
1675 [760]
1612 [731]
1550 [703]
1575 [714]
1599 [725]
9749 [4422]
100-6SR
1415 [642]
1614 [732]
1813 [822]
1598 [725]
1543 [700]
1487 [674]
9470 [4296]
11112 [5040]
115-6SR
1607 [729]
1849 [839]
2091 [948]
1795 [814]
1855 [841]
1915 [869]
125T-6SR
2169 [984]
2094 [950]
2020 [916]
1819 [825]
1987 [901]
2156 [978]
12246 [5555]
135-6SR
1700 [771]
1954 [886]
2208 [1002]
1886 [855]
1949 [884]
2011 [912]
11708 [5311]
150-6SR
1794 [814]
2102 [953]
2411 [1094]
2057 [933]
2091 [948]
2125 [964]
12581 [5707]
150T-6SR
2323 [1054]
2258 [1024]
2192 [994]
1994 [904]
2125 [964]
2256 [1023]
13148 [5964]
175T-6SR
3046 [1382]
2787 [1264]
2528 [1147]
2145 [973]
2427 [1101]
2708 [1228]
15641 [7095]
190-6SR
2056 [933]
2257 [1024]
2458 [1115]
2715 [1232]
2704 [1227]
2692 [1221]
14882 [6750]
- 18 -
DIMENSIONAL CLEARANCE
SPACE REQUIREMENTS
Single Pit (See Note 2)
Double Pit (See Note 2)
Multi Pit
Notes:
1.) All dimensions are minimal, unless
otherwise noted.
Corner Wall
2.) Pit installations are not recommended. Re-circulation of hot
condenser air in combination with
surface air turbulence cannot be
predicted. Hot air re-circulation will
severely affect unit efficiency (EER)
and can cause high pressure or fan
motor temperature trips. DunhamBush will not be responsible for
ducting fans to a higher level to
alleviate the above mentioned
conditions.
- 19 -
EVAPORATOR WATER PRESSURE DROP
IMPERIAL UNITS
PRESSURE DROP - ft.wg.
100
AFHX 75-6SR
AFHX 80T-6SR
AFHX 90T-6SR
AFHX 100-6SR
AFHX 115-6SR
AFHX 150-6SR
AFHX 150T-6SR
10
AFHX 125T-6SR
AFHX 135-6SR
AFHX 175T-6SR
AFHX 190-6SR
1
10
100
1000
WATER FLOW RATE - USgpm
S. I. UNITS
PRESSURE DROP - kPa
1000
AFHX 75-6SR
AFHX 80T-6SR
AFHX 90T-6SR
AFHX 100-6SR
AFHX 115-6SR
AFHX 150-6SR
AFHX 150T-6SR
100
AFHX 125T-6SR
AFHX 135-6SR
AFHX 175T-6SR
AFHX 190-6SR
10
1
10
100
1000
WATER FLOW RATE - m³/hr
SOUND PRESSURE DATA
Octave Band (Hz)
Model
63
125
250
500
1K
2K
4K
8K
Total
dB (A)
AFHX 75-6SR
45
44
50
52
57
55
51
43
61
AFHX 80T-6SR
46
45
51
53
58
56
51
44
62
AFHX 90T-6SR
46
45
51
53
58
56
51
44
62
AFHX 100-6SR
48
46
52
53
60
57
52
44
63
64
AFHX 115-6SR
48
47
53
54
61
58
53
45
AFHX 125T-6SR
47
46
52
54
59
57
52
45
63
AFHX 135-6SR
50
49
54
55
63
60
55
46
66
AFHX 150-6SR
51
49
55
55
63
60
55
46
66
AFHX 150T-6SR
48
47
52
54
60
57
53
45
63
AFHX 175T-6SR
49
48
54
55
61
59
54
46
65
AFHX 190-6SR
51
49
55
56
63
61
55
46
67
Note: Unit Sound Pressure Level (Lp) @ 33 ft [10m] (free field), ± 2 dB tolerance.
- 20 -
CONDENSER FAN
FAN POSITION NUMBER & CYCLING SEQUENCE
AFHX 115-6SR, 135-6SR, 150-6SR,
125T-6SR, 150T-6SR
AFHX 75-6SR, 100-6SR,
80T-6SR, 90T-6SR
BASE FANS
2, 4, 6
BASE FANS
2, 4, 6, 8
STAGE 1
1, 5
STAGE 1
1, 5
STAGE 2
3
STAGE 2
3, 7
AFHX 175T-6SR, 190-6SR
BASE FANS
2, 4, 6, 8, 10
STAGE 1
1, 5
STAGE 2
3, 7
STAGE 3
9
ELECTRICAL DATA
MODEL
AFHX
COMPRESSOR DATA
COND. FAN MOTOR DATA
UNIT ELECTRICAL DATA
MODEL
QTY
RLA
LRA
QTY
HP
FLA
FLA
MCA
MFS
75-6SR
HX1512
1
107
625
6
2
3.8
130
157
250
80T-6SR
HX1309
2
58
325
6
2
3.8
139
153
200
90T-6SR
HX1311
2
67
325
6
2
3.8
157
174
200
100-6SR
HX1709
1
143
730
6
2
3.8
166
202
300
350
115-6SR
HX1711
1
162
845
8
2
3.8
192
233
125T-6SR
HX1509
2
89
500
8
2
3.8
208
231
300
135-6SR
HX1811
1
194
915
8
2
3.8
224
273
450
150-6SR
HX1813
1
213
1400
8
2
3.8
243
297
500
150T-6SR
HX1512
2
113
625
8
2
3.8
256
285
350
175T-6SR
HX1709
HX1512
1
1
142
109
730
625
10
2
3.8
289
325
450
190-6SR
HX1816
1
281
1495
10
2
3.8
319
389
600
Note:
MCA - Minimum Circuit Ampacity
FLA – Full Load Amps
MFS - Maximum Fuse Size
LRA - Locked Rotor Amps
- 21 -
RLA - Running Load Amps
TYPICAL WIRING SCHEMATIC
TWO COMPRESSORS UNIT
- 22 -
TYPICAL WIRING SCHEMATIC
- 23 -
TYPICAL WIRING SCHEMATIC
Ω
Ω
- 24 -
TYPICAL WIRING SCHEMATIC
- 25 -
GUIDE SPECIFICATIONS
1. The contractor shall in accordance with the plans,
furnish and install _____________ Dunham-Bush
_______________ packaged liquid chiller(s). The
unit(s) shall be completely factory packaged
including rotary screw compressor(s), evaporator,
condenser, and controller control center. The
packaged chiller shall be factory assembled,
charged and tested with a full operating refrigerant
and oil charge. The refrigerant type shall be R134a.
2. Capacity of each chiller shall be not less than
_________________ TR (kW output) cooling
_____________ USgpm (liters/min.) of water from
__________ °F[°C] to _________ °F[°C]. Power
input requirements for the unit(s), incorporating all
appurtenances necessary for unit operation,
including but not limited to the control accessories
and oil pump or pumps, if required, shall not exceed
___________kW input at design conditions. The
unit shall be able to unload to _______% of cooling
(refrigeration) capacity when operating with leaving
chilled water and entering condenser water
temperature at full load design temperatures. The
unit shall be capable of continuous operation at this
point, with stable compressor operation, without the
use of hot gas bypass.
3. Heat transfer surfaces shall be selected to reflect
the incorporation of a fouling factor of 0.0001 hr.ft².
°F/BTU [0.000018m².°C/W] for the evaporator.
Water pressure drop at design conditions shall not
exceed ____________ feet of water through the
evaporator.
4. The packaged chiller shall be furnished with singlestage direct connected positive displacement rotary
screw compressor(s) as required, of the oil injected
type, driven by a 3500 RPM (2900 RPM-50Hz)
motor. Each compressor shall include an integral oil
separation system, oil sump and oil filter. The oil
temperature shall be controlled during operation to
maintain proper oil temperatures throughout the
lubrication system. An electric oil heater shall be
supplied with each compressor to maintain oil
temperature during shutdown period. Each
compressor shall have a suction filter, suction
service valve and a discharge check valve.
Compressor capacity control shall be obtained by
an electrically initiated, hydraulically actuated slide
valve within each compressor housing. (Provide
isolation valves on all connections to compressor to
allow condenser to be used as a pump down
receiver.)
5. Evaporator vessels shall all be cleanable shell and
tube type with integral finned copper water tubes
mechanically expanded into heavy fixed steel tube
sheets. They are to be available in one, two or three
pass design as required on the drawings with
Victaulic connections. Flanges or stub out
connections optional. The shell side of the
evaporator is to have a single relief valve with
provision for refrigerant venting. Evaporators shall
be designed, constructed in accordance with the
ASME Code for Unfired Pressure Vessels. The
flooded evaporator shall have a built in distributor
for feeding refrigerant evenly under the tube bundle
to produce a uniform boiling action and baffle plates
shall be provided to ensure vapor separation. Water
headers are to be removable for tube cleaning. Vent
and drain plugs are to be provided in each head.
(All low temperature surfaces shall be factory
insulated.)
6. The flooded evaporator shall be fitted with an oil
recovery system. The oil recovery system will
ensure that the evaporator is operating at peak
efficiency at all times and provide optimal energy
efficiency during extended periods of part load.
Units without oil recovery systems mounted on the
evaporator will not be acceptable.
7. The condenser coil is to be constructed of copper
tubes and die formed aluminum fins having selfspacing collars. Fins shall be mechanically bonded
to the tubes. An integral sub-cooling loop shall be
incorporated into the coil. Condenser divider baffles
shall fully separate each condenser fan section to
control the airflow to maintain proper head pressure
control. The condenser shall be sized for pump
down capacity.
8. To maximize energy efficiency, the packaged chiller
shall be equipped with a flash economizer cycle and
modulating
refrigerant
expansion
devices.
Refrigerant vapor from the flash economizer shall
be fed back into an intermediate compressor stage,
reducing the enthalpy of the refrigerant and
increasing the net refrigeration effect of the
evaporator.
- 26 -
GUIDE SPECIFICATIONS
9
The fans shall be heavy duty, polypropylene blade,
direct drive propeller type. Motors shall be three
phase with internal overloads and are to be
permanently lubricated.
10. The packaged chiller shall be furnished with a
modulating refrigerant control system to optimize
efficiency and compressor protection. This
refrigerant control system will reduce the flow of
efficiency robbing refrigerant vapor in the
condenser from entering the evaporator at reduced
load by directly modulating a motorized refrigerant
valve in the liquid line entering the evaporator. In
addition, the refrigerant control system shall
measure the level of liquid refrigerant in the
flooded evaporator and restrict refrigerant flow
entering the evaporator upon a rise in the level,
protecting the compressor from liquid slugging.
Fixed orifice control systems will not be
acceptable. (Hot gas bypass shall be factory
installed for operation below minimum percent of
unit capacity.)
Terminal or PC with communication software
installed to enable remote monitoring.
12. The electrical control panel shall be wired to permit
fully automatic operation during - initial start-up,
normal operation, and shutdown conditions. The
control system shall contain the following control
and safety devices:
MANUAL CONTROLS
D Control circuit stop and start switches
D Compressor enable switch
SAFETY CONTROLS
D Solid state compressor motor starter overloads
D
D
D
D
D
D
(3 phase)
Low oil level optical sensor
High condenser pressure
Low evaporator pressure
Freeze protection
Chilled water flow loss
Under voltage phase failure relay
AUTOMATIC CONTROLS
D Compressor motor increment contactors
11. The packaged chiller shall be equipped with
controller control. The control shall provide for
compressor loading based on leaving chilled water
temperature. It shall provide for high and low
refrigerant pressure protection, low oil level
protection, evaporator water freeze protection,
sensor error protection, and motor load control
(demand limiter) based on amp draw. Anti-recycle
protection shall also be provided. The controller
shall have a simple keypad accessed input system
and be complete with a two-line 80 character
alphanumeric display. Input shall be accomplished
through simple menu driven display screens, with
on-line help available by pressing a help button at
anytime during operation. The controller shall
continuously monitor evaporator leaving water
temperature; evaporator and condenser pressure;
compressor amp draw; and refrigerant. The
controller shall be complete with all hardware and
software necessary to enable remote monitoring of
all data through the addition of only a simple,
phone modem and terminal. The controller shall be
complete with an RS232 "local" communications
port and an RS485 long distance differential
communications port. The controller shall also
accept a remote start and stop signal, 0 to 5VDC
chilled water temperature reset signal and (0 to
5VDC compressor current limit reset signal).
D Increment start timer
D Anti-recycle timer
D Oil sump heater interlock relays
REFRIGERANT CONTROLS
D Motorized refrigerant flow control
D Liquid refrigerant level sensor for evaporator
D Compressor load and unload solenoid valves
INDICATOR LIGHTS
D Power on
D Compressor high oil temperature
D Compressor motor overload
D System common alarm
13. The control system shall be provided with an antirecycle device. The control shall limit compressor
starting to a minimum of 15 minutes between
starts.
14. The packaged chiller shall be furnished with unit
mounted reduced inrush starting system for each
compressor. The starters shall be factory mounted
and wired, with individual circuit breakers on
multiple compressor units. The unit shall be wired
so that the only field electrical connection to the
packaged chiller shall be to a single three-phase
power terminal.
Optional items in (
- 27 -
)
Americas
Europe
Africa
United States of America
United Kingdom
South Africa
175 South Street,
West Hartford,
CT 06110, USA
8 Downley Road,
Havant, Hampshire,
England PO9 2JD
No. 57 Sovereign Drive
Route 21 Corporate Park
Irene, Pretoria
South Africa
Tel: 1-860-249 8671
Fax: 1-860-953 3300
Tel : 44-23-9247 7700
Fax: 44-23-9245 0396
China
Asia
Middle East & North Africa
No. 1 Dunham-Bush Road,
Laishan District,
Yantai,
Shandong Province,
China 264003
Singapore
United Arab Emirates
146B, Paya Lebar Road,
No. 05-01,
ACE Building,
Singapore 409017
Platinum Business Centre
Office No. 704
P. O. Box 30922,
Al Nahda 2nd, Dubai, UAE
Tel: 65-6842 2012
Fax: 65-6842 2013
Tel: 971-4-280 6699
Fax: 971-4-280 9886
Russia & CIS
India
Malaysia
Russia
Lot 11, Novinskiy Boulevard,
Moscow,
121099 Russian Federation
304 Sky Station,
Plot No. 109,
Viman Nagar,
Pune 411014,
India
Lot 5755-6, Kidamai Industrial Park,
Bukit Angkat,
43000 Kajang,
Selangor Darul Ehsan,
Malaysia
Tel: 7-499-255 6953
Fax: 7-499-255 6953
Tel: 91-20-4131 4682
Fax: 91-20-4131 4683
Tel: 603-8924 9000
Fax: 603-8739 5020
Tel: 86-535-658 8999
Fax: 86-535-658 1999
[email protected]
www.dunham-bush.com
Tel: 27-12-345 4202
Fax: 27-12-345 4203
Products that perform...By people who care
Manufacturer reserves the right to change specifications without prior notice.
M-S-0481A-0311