WSHP-DS-6
March 2000
Water Source
Heat Pump
Water-to-Water
Model WPWD
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Table
of
Contents
Introduction
2
Features and Benefits
Model Number Description
General Data
4
7
8
Application Considerations
Electrical Data
9
18
19
25
28
30
31
Performance Data
Dimensional Data
Wiring Diagram
Accessory Options
Mechanical Specifications
3
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Features
and
Benefits
General
WPWD cabinet includes full length
channel stiffeners underneath the
unit.
General
The water source heat pump model
WPWD (water-to-water) offers a
range of capacities from 2 tons to 6
tons. All units are housed in one
standard compact cabinet.
Heat Exchanger
The water to refrigerant heat ex-
changers are made of stainless
steel brazed plate. This design pro-
vides a larger amount of surface
area for heat exchange between
the water and the refrigerant. (See
Figure 2 for cut-away).
Cabinet
The cabinet, which allows easy ac-
cess for installation and service, is
constructed of heavy gauge metal.
The cabinet finish is produced by a
corrosion resistant electrostatic
powder paint coating in the color
“soft dove”.
.
The top half of the diagonal cabinet
is removable for access to the inter-
nal components by removing two
screws. (See Figure 1).
Figure 2: Brazed plate heat ex-
changer
Piping
All low-side copper tubing in the re-
frigeration circuit is insulated to pre-
vent condensation at low entering
liquid temperatures.
Filter Drier
A filter drier is provided in each unit
for dehydration and cleaning of the
refrigeration circuit. This feature
adds to the unit life.
Figure 1: Unit access
Insulation
Expansion Valve
To reduce condensation and com-
pressor noise, the cabinets are in-
sulated with 1/2-inch thick,
neoprene backed, acoustical fiber-
glass insulation.
As standard, Trane provides a bal-
anced port thermal expansion
valve. This valve precisely meters
the refrigerant flow through the cir-
cuitry to achieve the desired heat-
ing or cooling over a wide range of
fluid temperatures.
Compressor
The model WPWD contains a high
efficiency scroll compressor for reli-
able and efficient operation. The
scroll compressor’s unique design
lends itself to having one of the low-
est sound levels in the industry.
Water Connections
All water connections feature
1-inch brass swivel connectors. Be-
cause the connectors are swivel, a
back-up wrench is not necessary
when tightening.
The compressor is internally isolat-
ed and placed on a stiff base plate
designed to further reduce vibration
noise. As an added benefit, the
4
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Features
and
Benefits
Controls
24 Volt Controls
All electrical controls and safety de-
vices are factory wired, tested, and
mounted in the unit. The control
package includes:
50 VA Transformer
24 VAC Contactor
Lockout
Relay
Ground
q Compressor contactor
q 24 Volt transformer
q Lockout relay
q Compressor run capacitor (1-
Compressor
Run Capacitor
phase units only)
q Reversing valve coil (For heat
Low Voltage
pump only)
High Voltage
2 Amp Fuse
(for use with
desuperheater
option)
q Fuse (for desuperheater)
10 Pole Terminal
Strip
A terminal strip with 1/4” fork con-
nections will be provided for field
thermostat control wiring. (See Fig-
ure 3).
Safety Devices
Each Trane water-to-water unit con-
tains safety devices to prevent com-
pressor damage. These include:
Thermostat
Low Voltage
Figure 3: Controls
Low Temperature
Detection Thermostat
Lockout Relay
q Low pressure switch
When the safety controls are acti-
vated to prevent compressor short
cycling, the lockout relay (circuit)
can be reset at the thermostat, or by
cycling power to the unit.
q High pressure switch
The low water temperature detec-
tion thermostat is provided to pro-
tect the water-to-refrigerant heat
exchanger from freezing. This de-
vice prevents compressor opera-
tion if leaving water temperature is
below 35 F. An optional 20 F tem-
perature thermostat may be applied
for low water temperatures where
an appropriate antifreeze solution is
used.
q Temperature sensor (freezestat)
q Internal overload protection
Low Pressure Switch
The low pressure switch prevents
compressor operation under low
charge or in excessive loss of
charge situations. This device is set
to activate at refrigerant pressures
of 35 psig when a 35 F low temper-
ature detection thermostat is ap-
plied. An optional 7 psig pressure
switch is available when using a 20
F temperature low temperature de-
tection thermostat.
Thermostat Hook-up
Low voltage and high voltage
knockouts are provided in the top
half of the unit. All control wiring to
the unit should be 24 Volt.
(See Figure 4 for termination
points).
High Pressure Switch
For internal overload protection,
Trane provides a high pressure
switch. This de-energizes the com-
pressor when discharge pressure
become excessive.
24V Power
Compressor
Reversing Valve
(energized in clg)
Figure 4: Typical thermostat termination points
5
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Features
and
Heat
Recovery
Benefits
Desuperheater Option
The unit employs a circulating pump
to move water through a double wall
heat exchanger. It then returns the
heated water to the water tank. This
water is heated by superheated re-
frigerant discharge gas from the
compressor. This heat energy can
now be utilized as a cost savings in
water heating.
The desuperheater option is a heat
recovery system packaged within
the water-to-water unit. This option
captures heat energy from the heat
pump for considerable cost savings
all year. Since it is active in either
operating mode, it can provide hot
water at a reduced cost while in
heating or virtually free hot water
while in cooling.
Circulating Pump
The pump is a circular, single stage
open system pump. Its specifica-
tions include:
Standard equipment includes:
q 1/25 HP (horsepower)
q 230 Volt / 60 Hertz / 1 phase
q 90 Watts
q Desuperheater (heat
exchanger)
q Circulating pump
q Entering water temperature
q .40 Amps
detector (125 F stops pump)
q 2865 rpm (revolutions per
q Discharge refrigerant
temperature detector (145 F
starts pump)
minute)
q 2 MF (microfarad) / 400 Volt
capacitor
q Fuse
The pump contains a minimum fluid
temperature rating of 50 F, a maxi-
mum fluid temperature (open sys-
tem) of 140 F, and a maximum
working pressure of 145 psi.
q Water heater hook-up kit
Hot water
(Supply)
Cold water
(Supply)
from Desuperheater
to Desuperheater
Isolation
Valves
(by others)
Desuper-out
Desuper-in
Water heater
hook-up kit with
drain valve
6
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Model Number
Description
1
5
10
15
Digit 11: Freeze Protection
(source side)
Digits 1 & 2: Product Type
WP = Trane Commercial Water
Source Heat Pump
1 = Brazed Plate Heat Exchanger
with 35 F (1.67 C) Freezestat
2 = Brazed Plate Heat Exchanger
with 20 F (-6.67 C) Freezestat
Digit 3: Product Configuration
W = Water-to-Water
Digit 4: Development Sequence D
Digit 12: Freeze Protection
(load side)
1 = Brazed Plate Heat Exchanger
with 35 F (1.67 C) Freezestat
2 = Brazed Plate Heat Exchanger
with 20 F (-6.67 C) Freezestat
Digits 5-7: Unit Nominal Capacity
024 = 24.0 MBh
036 = 36.0 MBh
042 = 42.0 MBh
048 = 48.0 MBh
060 = 60.0 MBh
072 = 72.0 MBh
Digit 13: Desuperheater Option
0 = No Desuperheater
1 = With Desuperheater
Digit 14: Open
Digit 8: Voltage / Hertz / Phase
1 = 208-230/60/1
3 = 208-230/60/3
4 = 460/60/3
0 = Open Digit
Digit 15: Open
5 = 575/60/3
6 = 220-240/50/1
7 = 265/60/1
0 = Open Digit
9 = 380-415/50/3
Digit 16: Sticker Option
T = Trane
C = Command-Aire
Digit 9: Unit Arrangement
0 = Water-to-Water
Digit 10: Design Sequence C
7
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General
Data
Table G-1: Physical Data (English)
Model: WPWD
024
036
042
048
060
072
Width of cabinet (in)
23
23
23
23
23
23
Width of cabinet and connections (in)
24.8
24.3
23.3
Scroll
3.25
24.8
24.3
23.3
Scroll
3.375
24.8
24.3
23.3
Scroll
3.50
24.8
24.3
23.3
Scroll
4.00
24.8
24.3
23.3
Scroll
4.25
24.8
24.3
23.3
Scroll
4.25
Unit Size
Height (in)
Depth (in)
Compressor
R-22
Type
Refrigerant (lbs)
Approximate Weight
(lbs)
With crate (lbs)
163
183
203
214
244
277
Table G-2: Specifications (English)
Model: WPWD
024
036
042
048
060
072
Source and Load
GPM
4.0
6.0
7.0
7.50
10
10
Source and Load
Cooling
Ft. Hd.
1.4
3.2
4.4
31.3
15.7
39.69
3.7
5.0
9.2
9.2
Load EWT 45 F (MBH)
Load EWT 45 F (EER)
Load EWT 100 F (MBH)
Load EWT 100 F (COP)
18.24
15.0
26.74
15.7
35.55
15.4
45.98
15.5
51.01
14.9
Cooling
Heating
25.38
3.64
33.34
3.62
42.87
3.45
57.15
3.62
67.47
3.62
Heating
Note:
q Source EWT (entering water temperature) is at 75 F
q Unit selection should be based upon extended specifications at lowest or highest expected source and load
EWT (entering water temperature)
q Refer to pages 19-25 for extended performance tables.
8
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Application
Considerations
Closed Loop System
Closed loop systems (both ground source
and surface water) provide heat rejection
and heat addition to maintain proper water
source temperatures.
Operating and maintenace cost are low
because an auxillary fossil fuel boiler and
cooling tower are not required to maintain
the loop temperature. The technology has
advanced to the point where many electric
utilities and rural electric cooperatives are
offering incentives for the installation of
geothermal systems. These incentives are
offered because of savings to the utilities
due to reduced peak loads that flatten out
the system demand curve over time.
For ground source geothermal systems,
Figure 5: Ground source geothermal system
(See Figure 5), when building cooling
requirements
cause
loop
water
temperatures to rise, heat is dissapated into
the cooler earth through buried polyethylene
pipe heat exchangers. If reversed, heating
demands cause the loop temperature to fall,
enabling the earth to add heat to meet load
requirements.
Where local building codes require water
retention ponds for short term storage of
surface run-off, a ground source surface
water system, (See Figure 6), can be very
cost effective. This system has all the
advantages as the geothermal system in
cooling dominated structures.
Another benefit of the ground source system
is that it is environmentally friendly. The loop
is made of chemically inert, non-polluting
polyethylene pipe. The heat pumps use
HCFC-22 refrigerant, which has a lower
ozone depletion potential than CFC-12.
Because the closed loop system does not
require a heat adder, there are no CO
2
emissions. Less electric power consumed
reduces secondary emissions from the
power plant. Therefore, the system offers
advantages not seen by other central
furnace or heat pump systems.
Figure 6: Ground source surface water system
9
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Application
Considerations
Open Loop System
Where an existing or proposed well can
provide an ample supply of suitable quality
water, ground water systems may be very
efficient. (See Figure 7)
Operation and benefits are similar to those
for closed loop systems. There are however
several considerations that should be
addressed prior to installation.
q An acceptable way to discharge the
significant volume of used water from
the heat pump should be defined. It may
be necessary to install a recharge well to
return the water to the aquifer.
q Water quality must be acceptable, with
minimal suspended solids. To help
ensure clean water, a straining device
may be required.
Figure 7: Open Loop system
Cooling Tower/Boiler System
A cooling tower/boiler system (see Figure 8)
utilizes a closed heat recovery loop along
with multiple water source heat pumps in a
more conventional manner.
Typically, a boiler is employed to maintain
closed loop temperatures above 60 F and a
cooling tower to maintain closed loop
temperature below 90 F. All the units
function independantly, either by adding
heat, or removing heat from the closed
water loop, making this system more
efficient than air cooled systems.
The cooling tower/boiler system provides a
low installation cost to the owner than other
systems. A good selection for large building
design needs.
Figure 8: Cooling tower/boiler system
10
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Application
Considerations
Source Side
vs.
Load Side
source side heat exchanger to the
load side heat exchanger.
Source vs. Load
The model WPWD water-to-water
system contains two water to refrig-
erant heat exchangers. The two
heat exchangers enable the system
to be divided into a source and load
separation.
The “load side” heat exchanger
takes the place of a DX (direct ex-
pansion) air coil. It provides treated
fluid (hot or cold) to a mechanical
device. These mechanical devices
include designs such as radiant slab
heating, hydronic coils, or fresh air
ventilation units.
The “source side” heat exchanger
performs as in a standard water to
air heat pump system. The source is
typically supplied through a cooling
tower, boiler, closed loop, or open
well system. During the refrigeration
cycle, heat is transferred from the
See Figure 9 for a basic schematic
of source side verses load side of a
water-to-water system.
Water-In
(Load Side)
Water-In
(Source Side)
Fluid traveling
Fluid traveling
TO or FROM a
TO or FROM a cooling
tower, boiler, ground
loop or open well
system
mechanical device
such as hydronic coil,
concrete slab, or flooring
Refrigeration
Circuit
Water-Out
(Load Side)
Water-Out
(Source Side)
Figure 9: Source/Load schematic
11
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Application
Considerations
Closed Loop
Geothermal
Hydronic Ice
Melting Via
a Water-to-Water
Unit
Geothermal Space
Temperature
Heating / Cooling
Refrigeration
Equipment
(Closed) Ground Loop
Heat Exchanger
Cold climates may take an even
Geothermal
Typical Benefits
greater advantage of the heat
rejected by the stores refrigeration
equipment and space conditioning
heat pumps. This rejected heat
may be used by Trane’s water-to-
water heat pump(s) to heat water
for a car wash and melt ice off of a
driveway (allowing the car wash to
remain open all winter).
This integrated system also
eliminates thermal short circuiting
between the intakes and the
exhausts of an air cooled
refrigeration system.
Integrated System
q Annual energy savings means
The Trane ground source heat
pump is highly efficient in service
station applications.
This integrated system design
takes advantage of the earths
relatively constant temperature
(45 F to 70 F) to space condition
lower operational costs
q Takes advantage of the earths
constant temperature rather
than high fluctuation of ambient
temperature
q Heat energy rejected from the
space conditioner can be
utilized for ice or snow melting
of a parking lot in colder
climates
the
building.
In
addition,
appliances such as freezers, ice
makers and a display coolers may
be added to the loop for further
gains in the reduction of consumed
energy.
q Two to three year estimated
payback on installation costs
12
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Application
Considerations
Fresh Air
Ventilation
Water-Out
(source)
Fresh Air Ventilation
with Water-to-Water Units
Water-Out
(load)
Water-In
(source)
Water-In
(load)
Exhaust
Air
Fresh
Air
Geothermal Space
Heating and Cooling
(Closed) Ground
Loop Heat
Exchanger
Water-to-Water
and Fresh Air
Ventilation
Geothermal energy systems take
advantage of the fact that
subsurface earth temperatures are
constant year-round, which makes
the earth an ideal heat source and
heat sink for heat pumps.
the makeup air unit hydronic coil to
heat the makeup air to maintain
building requirements. This
ventilation system incorporates its
own constant volume pumps to pull
system water off the loop and
return it. There is no need for
additional heat injection using
boilers for this system. (See Page
14 for mechanical example).
energy to temper the ventilated air
in accordance with the building
needs. After leaving the reheat
hydronic coil, the condenser water
is then returned to the building loop
for further heat rejection.
The above design goes further than
just space heating and cooling.
Fresh air ventilation is achieved by
using Trane water-to-water units
teamed with a hydronic outside air
unit, and exhaust air unit to meet
total building requirements.
Typical Benefits
In heating, the water-to-water units
switch to hot water generation. The
water for ventilation air tempering
first circulates through the hydronic
coil to the exhaust air unit to pick
up heat from the building exhaust
airstream. The water then
circulates through the water-to-
water heat pumps for further heat
introduction before being used by
q Annual energy savings means
lower energy costs
In the cooling season, the
evaporator water from the heat
pumps is circulated through a
hydronic coil in the makeup air unit
to provide cooling and
dehumidification. The condenser
water is used to provide reheat
q Building comfort and climate
control
13
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Application
Considerations
Fresh Air
Ventilation
Mechanical
EXHAUST
OUTSIDE
AIR
AIR
HOT WATER
COIL
AIR
HANDLER
AIR
HANDLER
EXP TANK
AUTOMATIC
AIR VENT
HAND
PUMP
WPWD
DRAIN VA
PRESSURE
RELIEF VA
WPWD
WPWD
WPWD
BALL VA
SUPPLY
RETURN
14
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Application
Considerations
Central
Pumping
System
6
7
1
5
2
4
3
Figure 10: Central pumping system installation
minal devices with 45 F or
Central Pump
Application
General
120 F fluid.
A central pumping system involves
a single pump design usually locat-
ed within a basement or mechanical
room to fulfill pumping requirements
for the entire building system. With
a central pumping system, an auxil-
iary pump is typically applied to
lessen the likelihood of system
down-time if the main pump mal-
functions.
ꢄꢁ The sound attenuation pad
should be slightly oversized for
unit. This field supplied product
is recommended for sound
absorption of unit.
ꢀꢁ Ball valves should be installed
in the supply and return lines
for unit isolation and unit water
flow rate balancing (if an auto-
matic flow device is not
ꢅꢁ The low voltage control con-
nection provided on the unit is
large enough for attaching con-
duit.
selected). This connection,
along with hoses, are also rec-
ommended for backflushing
and chemical cleaning of the
water to refrigerant heat
ꢆꢁ The central systems supply
and return lines should be
sized to handle the required
flow with a minimum pressure
drop.
exchanger.
(See Figure 10 for unit installation of
a central pumping system).
ꢂꢁ Flexible hoses may be used
to connect the water supply
and return lines to the water
inlets and outlets. These hoses
reduce possible vibration
between the unit and the rigid
system.
Note: Pipe will sweat if low
temperature water is run
through the supply or return
lines. Trane recommends that
these lines be insulated to pre-
vent damage from condensa-
tion.
Note: Hoses and or pipes
should be made of braided
stainless steel, and sized suit-
ably for the systems water
pressure and flow rate.
ꢇꢁ The field supplied line voltage
disconnect should be
installed for branch circuit pro-
tection. The unit is supplied
with an opening for attaching
conduit.
ꢃꢁ Load side connections are
typically used to supply the ter-
ꢀꢁ
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Application
Considerations
Well Water
Systems
7
6
5
9
8
1
3
2
4
Figure 11: Well water installation
ꢄꢁ The sound attenuation pad
Well Water
Application
General
should be slightly oversized for
the unit. This field supplied
product is recommended for
sound absorption of unit.
A well water application involves an
open loop water supply. The water
is drawn from an open well or pond
into the unit. A straining device is
required with this application.
ꢀꢁ Ball valves should be installed
in the supply and return lines
for unit isolation and unit water
flow rate balancing (if auto-
matic flow device is not
ꢅꢁ The low voltage control con-
nection provided on the unit is
large enough for attaching con-
duit.
selected). This connection,
along with hoses, are also rec-
ommended for backflushing
and chemical cleaning of the
evaporator and the condenser.
Similar to the closed loop design,
an open water supply usually
remains at a constant temperature
year round utilizing maximum
efficiency in unit design.
ꢆꢁ The expansion tank should be
sized to maintain pressure on
the system.
ꢇꢁ The line voltage disconnect
should be installed for branch
circuit protection. The unit is
supplied with an opening for
attaching conduit.
ꢂꢁ Flexible hoses may be used to
connect the water supply and
return lines to the water inlets
and outlets. These hoses
reduce possible vibration
between the unit and the rigid
system.
See Figure 11 for open well water
installation.
ꢈꢁ The water regulating valve
assembly is used to maintain
refrigerant pressure in refriger-
ant circuit as the entering water
temperature varies or is cooler
than ideal.
Note: Hoses and or pipes
should be braided stainless
steel, and sized suitable for the
system’s water pressure and
flow rate.
ꢉꢁ Schrader connections are
factory installed for ease of
attaching the water regulating
valve assembly.
ꢃꢁ Load side connections are
used to supply the terminal
device.
16
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Application
Considerations
Distributed
Pumping
System
8
7
6
1
5
2
4
3
Figure 12: Distibuted pumping installation
ꢄꢁ The sound attenuation pad
should be slightly oversized for
the unit. This field supplied
General
Earth Coupled
Application
A distributed pumping system con-
tains either a single or dual pump
module connected directly to the
units supply and return source side.
product is recommended for
ꢀꢁ Ball valves should be installed
in the supply and return lines
for unit isolation.
sound absorption of unit.
ꢅꢁ The low voltage control con-
nection provided on the unit is
large enough for attaching con-
duit.
This design requires individual ꢂꢁ Flexible hoses may be used
to connect the water supply
and return lines to the water
inlets and outlets. These hoses
reduce possible vibration
between the unit and the rigid
system.
Note: Hoses and or pipes
should be braided stainless
steel, and sized suitable for the
system’s water pressure and
flow rate.
pump modules specifically sized for
each water source heat pump. Cen-
tralized pumping is not required.
ꢆꢁ The ground loop pump mod-
ule is designed for circulating
commercial loops that require
a maximum flow rate of 20
gpm.
See Figure 12 for a distributed
pumping installation.
ꢇꢁ The line voltage disconnect
should be installed for branch
circuit protection. The unit is
supplied with an opening for
attaching conduit.
ꢃꢁ Load side connections are
used to supply the terminal
device.
ꢈꢁ All polyethene pipe in the
closed loop design should be
insulated to eliminate the risk
of sweating.
17
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Electrical
Data
Table E-1: Electrical Data
024
036
042
048
060
072
Model: WPWD
Voltage
208-230/60hz/1phase
Compressor RLA
11.4
56
15
73
18.4
95
20.4
109
28.6
45
28
169
39
32.1
169
45
Compressor LRA
Minimum Circuit Ampacity
Max Fuse Size
16
21
25.8
40
25
30
60
70
Aux Pump Amps
2.5
14.3
0.4
2.5
18.8
0.4
2.5
23
2.5
2.5
35
2.5
40.1
0.4
Desuperheater Min Cir Ampacity
Desuperheater Pump RLA
Voltage
25.5
0.4
0.4
0.4
208-230/60hz/3phase
Compressor RLA
-
-
-
-
-
-
-
10.7
63
11.4
77
13.9
88
20
123
28
19.3
137
27
Compressor LRA
Minimum Circuit Ampacity
Max Fuse Size
15
16
19.4
30
20
25
45
40
Aux Pump Amps
2.5
13.4
0.4
2.5
14.3
0.4
2.5
2.5
25
2.5
24.1
0.4
Desuperheater Min Cir Ampacity
Desuperheater Pump RLA
Voltage
17.4
0.4
0.4
460/60hz/3phase
Compressor RLA
-
-
-
-
-
-
-
5
5.7
39
8
7.1
44
7.5
49.5
10.5
15
10
62
Compressor LRA
31
7
Minimum Circuit Ampacity
Max Fuse Size
10
14
15
2.5
6.3
0.4
15
2.5
7.1
0.4
15
20
Aux Pump Amps
2.5
8.9
0.4
2.5
2.5
12.5
0.4
Desuperheater Min Cir Ampacity
Desuperheater Pump RLA
Voltage
9.4
0.4
575/60hz/3phase
Compressor RLA
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
6.4
40
9
7.8
50
Compressor LRA
Minimum Circuit Ampacity
Max Fuse Size
11
15
2.5
8
15
Aux Pump Amps
2.5
9.8
0.4
Desuperheater Min Cir Ampacity
Desuperheater Pump RLA
Voltage
0.4
265/60hz/1phase
Compressor RLA
9.6
47
14.3
71
16.4
83
17.1
98
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Compressor LRA
Minimum Circuit Ampacity
Max Fuse Size
13.5
20
20
23
24
30
35
35
Aux Pump Amps
2.5
12
2.5
17.9
0.4
2.5
20.5
0.4
2.5
21.4
0.4
Desuperheater Min Cir Ampacity
Desuperheater Pump RLA
0.4
18
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