Daikin WRA Instruction Manual

Installation and Maintenance Data
IM 1072-1
Group: WSHP
Part Number: 667691802
Date: October 2013
Daikin Water to Water Source Heat Pumps
3 to 35 Tons with R-410A
WRA - Heating and Cooling Models
WHA - Heating Only Models
WCA - Cooling Only Models
©2013 Daikin Applied • www.DaikinAP.com • [phone]

Page 2 of 44 Water to Water Source Heat Pumps IM 1072-1
Contents
Product Nomenclature........................................................3
Safety Information...............................................................4
Safe Operation Rules .......................................................4
Electrical Data......................................................................5
WRA, WHA, WCA 036 – 420 ............................................5
Installation............................................................................6
Pre-Installation and Code Requirements ..........................6
Mounting the Unit..............................................................6
Piping the Unit ..................................................................6
Domestic Hot Water Heat Recovery .................................6
Applications.........................................................................7
Start Up.................................................................................8
Check the following before powering the unit. ..................8
Maintenance Procedures ..................................................8
Dimensional Data ................................................................9
WRA, WCA, WHA – Size 036-072....................................9
WRA, WCA, WHA – Size 120-180..................................10
WRA, WCA, WHA – Size 240-420.................................. 11
Engineering Data...............................................................12
Physical Data ..................................................................12
Operating Pressures (PSIG) ...........................................12
Antifreeze Correction ......................................................13
Waterow Correction ......................................................13
Wiring Diagram ..................................................................14
208-230/60/1, Unit Sizes 036, 048, 060 and 072 ...........14
Legend ............................................................................15
Control................................................................................16
Optional Low Temperature Control Board "LTC" – 208-
230/60/1, Unit Sizes 036, 048, 060 and 072...................16
Compressor Control Module Functional Operation – 208-
230/60/1, Unit Sizes 036, 048, 060 and 072...................17
Wiring Diagram ..................................................................18
208-230/60/3, Unit Sizes 036, 048, 060 and 072 ...........18
Legend ............................................................................19
Control................................................................................20
Optional Low Temperature Control Board "LTC" – 208-
230/60/3, Unit Sizes 036, 048, 060 and 072...................20
Compressor Control Module Functional Operation – 208-
230/60/3, Unit Sizes 036, 048, 060 and 072...................21
Wiring Diagram ..................................................................22
208-230/60/3, Unit Sizes 120, 150, 180, 240 and 300 ...22
(Continued) 208-230/60/3, Unit Sizes 120, 150, 180, 240
and 300 ...........................................................................23
Legend ............................................................................24
Control................................................................................25
Optional Low Temperature Control Board "LTC" – 3 Phase,
Unit Sizes 120, 150, 180, 240 and 300...........................25
Compressor Control Module Functional Operation – 208-
230/60/3, Unit Sizes 120, 150, 180, 240 and 300 ..........26
Wiring Diagram ..................................................................27
208/230-60-3, Unit Sizes 360, 420 .................................27
(Continued) 208/230-60-3, Unit Sizes 360, 420 .............28
Legend ............................................................................29
Control................................................................................30
Optional Low Temperature Control Board "LTC" – 208/230-
60-3, Unit Sizes 360, 420 ...............................................30
Compressor Control Module Functional Operation –
208/230-60-3, Unit Sizes 360, 420 .................................31
Wiring Diagram ..................................................................32
460-60-3, 575-60-3, Unit Sizes 360, 420 ........................32
(Continued) 460-60-3, 575-60-3, Unit Sizes 360, 420 ....33
Legend ............................................................................34
Control................................................................................35
Optional Low Temperature Control Board "LTC" – 460-60-
3, 575-60-3, Unit Sizes 360, 420 ....................................35
Compressor Control Module Functional Operation – 460-
60-3, 575-60-3, Unit Sizes 360, 420 ...............................36
WHA Circuit Diagram ........................................................37
WRA Circuit Diagram ........................................................38
WCA Circuit Diagram ........................................................39
Check, Test and Start Form ..............................................40
General Service Guide ......................................................41
Replacement Parts List.....................................................42

IM 1072-1 Water to Water Source Heat Pumps Page 3 of 44
Product Nomenclature
W WRA 1 036 E F T F YY FS A C Y A PVM
Controls
E = Electromechanical
T = Temperature
Control System
Voltage
E = 208-230/60/1
F = 208-230/60/3
K = 460/60/3
L = 575/60/3
Product Category
W = WSHP
Product Identier
WRA = Heating and Cooling Models
WHA = Heating Only Models
WCA = Cooling Only Models
Design Series
1 = 1st Design
2 = 2nd Design
3 = 3rd Design
4 = 4th Design
Nominal Capacity
036 = 36,000 Btuh Nominal Cooling
048 = 48,000 Btuh Nominal Cooling
060 = 60,000 Btuh Nominal Cooling
072 = 72,000 Btuh Nominal Cooling
120 = 120,000 Btuh Nominal Cooling
150 = 150,000 Btuh Nominal Cooling
180 = 180,000 Btuh Nominal Cooling
240 = 240,000 Btuh Nominal Cooling
300 = 300,000 Btuh Nominal Cooling
360 = 360,000 Btuh Nominal Cooling
420 = 420,000 Btuh Nominal Cooling
Water Piping Location
F = Front
T = Top
L = Left Hand Side
R = Right Hand Side
Status Lights
YY = None
SL = Three Lights-Compressor-1, Compressor-2, Compressor fault
NOTE: For illustration purposes only. Not all options available with all models. Please consult your local Daikin Representative for specic
availability.
Freezestat
YY = None
FS = Adjustable for Geothermal and Boiler/Tower Application
Control Box Location
F = Front
L = Left Side Control Box
R = Right Side Control Box
Source Water to Refrigerant
Heat Exchanger Construction
C = Copper Inner Tube -
Steel Outer Tube
S = Cupro-Nickel Inner Tube -
Steel Outer Tube
Y = None
Desuperheater
Y = None
D = Waste Heat Recovery
Water Heater
Construction Type
A = Standard
Refrigerant
A = R-410A
Cabinet Electrical
YYY = None
PVM = Phase Monitor
Monitors Voltage
and Phase Loss

Page 4 of 44 Water to Water Source Heat Pumps IM 1072-1
Safety Information
Safe Operation Rules
Installation and maintenance are to be performed only by
qualied personnel who are familiar with and in compliance with
state, local and national codes and regulations, and experienced
with this type of equipment.
Please take a few minutes to read the instructions before
you install the heat pump. This will help you obtain the full
value from this unit. It will also help you avoid needless costs
that result from incorrect installation and are not covered in
the warranty.
Follow these instructions carefully. Failure to do so could
cause a malfunction of the heat pump, resulting in injury, death
and/or property damage.
Tubing and compressor contain high pressure refrigerant and
they must not be exposed to high temperature or be punctured.
WARNING
To prevent electrical shock, disconnect electric power to
system at main fuse or circuit breaker box until installa-
tion is complete.
CAUTION
Sharp edges can cause personal injury. Avoid contact with
them.
Safety and Signal Words
The signal words DANGER, WARNING and CAUTION
are used to identify levels of hazard seriousness. The signal word
DANGER is only used on product labels to signify an immedi-
ate hazard. The signal words WARNING and CAUTION will
be used on product labels and throughout this manual and other
manuals that may apply to the product.
DANGER
Immediate hazards which WILL result in severe personal
injury or death.
WARNING
Hazards or unsafe practices which COULD result in severe
personal injury or death.
CAUTION
Hazards or unsafe practices which COULD result in minor
personal injury or product or property damage.
Danger Label
White lettering on a black background except the word
DANGER which is white with a red background.
Electric Shock Hazard.
Turn Off All Power
Before Servicing.
Warning Label
White lettering on a black background except the word
WARNING which is white with an orange background.
Fire Hazard.
Use copper wire only.
Failure to observe
could result in property
damage, bodily injury
or death
Caution Label
White lettering on a black background except the word CAU-
TION which is white with a yellow background.
Cuts and Abrasion
Hazard.
Wear gloves and handle
with care.
Failure to observe could
result in bodily injury.
WARNING
This unit contains HFC-(R-410A), a azeotropic mixture of
R-32 (Diuoromethane) and R-125 (Pentauoroethane).
Do Not Vent HFC-(R-410A) to the atmoshpere. The U.S.
Clean Air Act requires the recovery of any residual re-
frigerant. Do not use R-22 service equipment or compo-
nents on R-410A systems.

IM 1072-1 Water to Water Source Heat Pumps Page 5 of 44
Electrical Data
WRA, WHA, WCA 036 – 420
Table 1: Electrical data
Unit Size Voltage/Hz/Ph
Compressor
Total Unit FLA Voltage
Min./Max.
Minimum Circuit
Ampacity
Max. Circuit
Breaker
Maximum
Fuse HACR
Breaker
Quantity RLA (each) LRA (each)
036
208-230/60/1
1
16.7 79.0 33.4 197/253 20.9 35 35
208-230/60/3 10.4 73.0 20.8 187/253 13.0 20 20
460/60/3 5.8 38.0 11.6 414/506 7.3 15 15
575/60/3 3.8 36.5 7.6 517/632 4.8 15 15
048
208-230/60/1
1
19.9 109.0 39.8 197/253 24.9 40 40
208-230/60/3 13.6 83.1 27.2 187/253 17.0 30 30
460/60/3 6.1 41.0 12.2 414/506 7.6 15 15
575/60/3 4.2 33.0 8.4 517/632 5.3 15 15
060
208-230/60/1
1
23.1 134.0 46.2 197/253 28.9 50 50
208-230/60/3 16.1 91.0 32.2 187/253 20.1 35 35
460/60/3 7.1 46.0 14.2 414/506 8.9 15 15
575/60/3 5.6 37.0 11.2 517/632 7.0 15 15
072
208-230/60/1
1
30.2 158.0 60.4 197/253 37.8 60 60
208-230/60/3 20.6 155.0 41.2 187/253 25.8 45 45
460/60/3 9.7 75.0 19.4 414/506 12.1 20 20
575/60/3 7.7 54.0 15.4 517/632 9.6 15 15
120
208-230/60/1
2
23.1 134.0 46.2 197/253 52.0 70 70
208-230/60/3 16.1 91.0 32.2 187/253 36.2 50 50
460/60/3 7.1 46.0 14.2 414/506 16.0 20 20
575/60/3 5.6 37.0 11.2 517/632 12.6 15 15
150
208-230/60/3
2
20.6 155.0 41.2 187/253 46.4 60 60
460/60/3 9.7 75.0 19.4 414/506 21.8 30 30
575/60/3 7.7 54.0 15.4 517/632 17.3 25 25
180
208-230/60/3
2
25.0 164.0 50.0 187/253 56.3 80 80
460/60/3 12.2 100.0 24.4 414/506 27.5 35 35
575/60/3 9.0 78.0 18.0 517/632 20.3 25 25
240
208-230/60/3
2
30.2 225.0 60.4 187/253 68.0 90 90
460/60/3 16.7 114.0 33.4 414/506 37.6 50 50
575/60/3 12.2 80.0 24.4 517/632 27.5 35 35
300
208-230/60/3
2
33.4 239.0 66.8 187/253 75.2 100 100
460/60/3 18.0 125.0 36.0 414/506 40.5 50 50
575/60/3 12.9 80.0 25.8 517/632 29.0 40 40
360
208-230/60/3
2
51.3 300.0 102.6 187/253 115.4 150 150
460/60/3 23.1 150.0 46.2 414/506 52.0 70 70
575/60/3 19.9 109.0 39.8 517/632 44.8 60 60
420
208-230/60/3
2
55.8 340.0 111.6 187/253 125.6 175 175
460/60/3 27.0 173.0 54.0 414/506 60.8 80 80
575/60/3 23.8 132.0 47.6 517/632 53.6 70 70
Legend:
FLA = Full Load Amps
HACR = Heating, Air Conditioning and Refrigeration Breaker
LRA = Lock Rotor Amps
RLA = Rated Load Amps

Page 6 of 44 Water to Water Source Heat Pumps IM 1072-1
Installation
Pre-Installation and Code Requirements
After removing the unit from the carton, immediately remove
the panels and inspect for any damage that might have occurred
during shipment. Report concealed damage immediately to the
transportation company and request inspection.
The electric power source must be the same voltage and
phase as shown on the serial plate. Line and low voltage wir-
ing must be done in accordance with local codes or the national
electric code.
Make a survey of the nal location for the unit before setting
it in place. The unit should be centrally located with respect to
the distribution system. Install the unit within a heated area.
Exposure to inclement weather conditions may cause freeze
damage that is not covered by the warranty.
Table 2: Capacity data
Model Heating (Btuh) Cooling (Btuh)
036 48,200 34,300
048 58,200 42,100
060 67,200 46,000
072 85,500 62,200
120 129,000 94,500
150 170,400 122,140
180 237,000 157,000
240 290,900 202,400
300 339,720 221,800
360 416,900 284,700
420 493,200 358,600
Notes: At standard rating conditions of:
Heating - 100°F entering load water, 70°F entering source water.
Cooling - 55°F entering load water, 85°F entering source water.
Mounting the Unit
The unit should be mounted level on a vibration absorbing
pad slightly larger than the base to provide isolation between
the unit and the oor. It is not necessary to anchor the unit to
the oor.
The electrical connections are accessible from the front. The
compressor can be accessed from either side. A minimum of 24"
clearance in front and sides of the unit should be provided to
allow sufcient room to make water and electrical connections.
If the unit is located in a conned space such as a closet, provi-
sions must be made for unit servicing. Unit sizes 036 thru 072
may be stacked vertically (2 high) in tight mechanical rooms.
Piping the Unit
Both source and load connections must be at least as large
as the connections on the unit. The unit may be furnished with
either copper or optional cupronickel coil on either source or
load coaxial heat exchanger. Cupronickel should always be used
when chlorinated water or ground water which is high in min-
eral content is the load or source load uid. Never use exible
hoses that are smaller (inside diameter) than that of the water
connection on the unit. Make sure hoses and pipes are suitable
for system water pressure and sized for proper ow rate.
The supply and the discharge pipes should be insulated to
prevent condensation damage caused by low water temperature
in the pipes.
If water hammer should occur during start-up or shut down,
slow closing diaphragm type solenoid valves should be used.
Placing the solenoid valve on the outlet side of the system helps
relieve this situation. Due to high pressure drop or poor throt-
tling characteristics, globe and gate valves should not be used,
all ow valves should be ball type.
Domestic Hot Water Heat Recovery
The unit may have an optional factory installed waste heat
recovery feature. The heat recovery device is factory piped to
the refrigerant circuit of the unit. The plumbing to the water
tank and the power to the recovery pump are to be completed
in the eld as required.
Care should be exercised in plumbing water lines to and
from the water heater.
Note: It is important that both water lines be insulated. For
run less than 50 feet one way, use 1/2" O.D. water
lines on models sizes 036 thru 072. A run over 50 feet
should be avoided. On models 120 thru 420 specic
system data must be matched to industry standard
pipe sizing charts.
To make a connection to Hot Water Heat Recovery:
1. Turn off power or gas valves to the water heater.
2. Turn off water supply to the water heater.
3. Open hot water faucet and drain tank.
4. Connect tubing to “Heat Recovery Water Out” on the unit
and extend this line to the hot water heater. Attach to hot
water heater with ttings.
CAUTION
Improper water ow in the system due to piping, valving
or improper pump operating will void the warranty.
5. Connect tubing to “Heat Recovery Water In” on the unit
and extend this line to the water heater. Attach to cold water
supply. Place pump in this line.
6. Set water heater thermostat as follows:
Electric, Double element - Upper 125°F, Lower
minimum Gas, Oil or Single element - 125°F
7. Wire according to single phase diagram (on page 14) and
three phase diagram (on page 18 and on page 22).
8. The piping and wiring are now complete. Turn on water
supply to water heater. With an open hot water faucet, al-
low tank to ll. Bleed air from water lines. Check for water
leaks. Do not restore power to water heater until after you
have veried that the heat recovery unit is working and you
have hot water circulating back to the water heater. Restore
power to the water heater.
9. On start up of the unit, make the following operation checks:
■ Pump runs only when the compressor is on. Pump is
turned on by thermostat on compressor discharge
line.
■ All air is purged from water lines.
■ Verify water circulation to and from water heater.

IM 1072-1 Water to Water Source Heat Pumps Page 7 of 44
Earth Coupled Application Closed Loop
Earth coupled closed loop systems should follow the same
International Ground Source Heat Pump Association guidelines
used for closed loop heat pump applications. Once piping is
completed between the loop pump kit and the earth loop, nal
purging and charging of the loop is required. A ush/purge
assembly capable of obtaining a velocity of 2 fps throughout
the entire system is required. Usually a pump of at least 1.5 hp
will be adequate to purge air and dirt particles from the loop
itself for most residential systems. Commercial systems must
be sized carefully using pump manufacturer pump curves and
system specic data. Flush the system adequately to remove as
much air as possible then pressurize the loop to a static pressure
of 20 to 30 psi. This is normally adequate for proper system
operation. Check for proper ow through the unit by checking
pressure drop across the heat exchanger and compare it to the
cooling and heating operating pressure tables on page 12. In
order to achieve proper cooling capacity in a earth coupled close
loop application, a rate of 3 gpm per ton is required. Antifreeze
solutions are required when low evaporating conditions are
anticipated. Always use pressure/temperature ports to provide
proper uid ow rates.
Typical Load Side Applications
There are many load side applications for which the uid to
uid liquid chiller heat pumps can be used. The most popular
used would include: Hydronic baseboard heating, hydronic in-
slab oor heating, forced air fan coil heating or cooling, ice and
snow removal, heating potable water, heating swimming pools
and spas, and process uid heating and cooling. When specify-
ing load side heat transfer surface it is important to consider the
heat pump output capacities and uid ow rates. Insufcient
load side heat transfer surface may cause unstable heat pump
operating. Pressure/temperature ports should always be used
to determine load side ow rates. Avoid contact of dissimilar
metals in the load side piping system.
The units can provide heating or cooling for pools and spas
without the use of a secondary heat exchanger. This application
would however require a cupronickel load side heat exchanger.
Automatic chemical feeders must never be installed upstream of
the heat pump. An external bypass should be installed to avoid
over owing the heat exchanger which could cause erosion.
Proper pool PH levels and chemical balances must be maintained
to avoid possible heat exchanger damage.
Applications
Cooling Tower/ Boiler Application Closed Loop
Cooling Tower and Boiler Loop System temperature is
usually maintained between 55°F and 90°F. In the cooling
mode, heat is rejected from the unit into the source water loop.
To reject excess heat from the water loop, the use of a closed
circuit evaporative cooler or an open type cooling tower with
a secondary heat exchanger between the tower and the water
loop is recommended. When utilizing open cooling towers
chemical water treatment is mandatory so that the water is free
from corrosive minerals. It is imperative that all air be removed
from the source closed loop side of the heat exchanger to protect
against fouling.
In the heating mode, heat is absorbed from the source water
loop. A boiler can be utilized to maintain the loop at the desired
temperature. In milder climates a “ooded tower” concept is
often used. This concept involves adding makeup water to the
cooling tower sump to maintain the desired loop temperature.
When making water connections to unit sizes 036 thru 072,
a Teon taped thread sealant is recommended to minimize foul-
ing of the pipes. Sweat connections are used for unit sizes 120
thru 420. The water lines should be routed so as not to interfere
with access to the unit. The use of short lengths on high pressure
hose with a swivel type tting may simplify the connections and
prevent vibration transmission to the building.
Before nal connection to the unit, the supply and return hose
kits must be connected together and the system ushed to remove
dirt, piping chips and foreign material. Ball valves should be
installed in the supply and return lines for unit isolation and unit
water ow rate balancing. The return valve can be adjusted to
obtain the proper ow rate whenever the unit heats or cools.
CAUTION
Water piping exposed to outside may freeze.
Pressure/temperature ports recommended both supply and
return lines adjacent to the unit for system ow balancing. Flow
can be accurately set by measuring the refrigerant-to-water heat
exchangers water side pressure drop.
Well Water Application Open Loop
Water pressure must be maintained in the heat exchanger by
placing water control valves at the outlet of the unit. A bladder
type expansion tank may be used to maintain pressure on the
system. Pressure/temperature ports should be used to set ow
rates by checking pressure drop across the heat exchanger. Avoid
using low voltage (24 volt) solenoids, using them may overload
the unit transformer or interfere with the lockout impedance
circuit. Line voltage solenoids across the load side of compres-
sor contactor are recommended. Normally residential systems
require about 2-gpm of ow rate per ton of cooling capacity is
needed in open loop systems.
Discharge water from a heat pump is not contaminated in
any manner and can be disposed of in various ways depending
on local building codes.
Disposal methods may be by recharge well, storm sewer,
drain eld, adjacent stream or pond. Most local codes forbid the
use of sanitary sewer for disposal. Consult the local building
and zoning department to determine compliance in your area.

Page 8 of 44 Water to Water Source Heat Pumps IM 1072-1
Start Up
Check the following before powering the unit.
• Avoid starting any electrical equipment for the rst time
alone, always have another person a safe distance from
the unit that can turn off the main power in the event of
an accident.
• High voltage supply matches the nameplate rating.
• Field wire size, breakers and fuses are the correct size.
• Low voltage control circuit is correct.
• Water piping is complete and correct.
• Closed loop system is ushed and purged.
• Isolation valves are open.
• Loop pumps are correctly wired.
• Access panels are in place and secured.
• Thermostat is in “off” position.
Electric Shock Hazard.
Turn Off All Power
Before Servicing.
Check, Test and Start (See Form on page 40)
1. Set thermostat to highest position.
2. Set thermostat switch to “cool”. Compressor should not
operate. The source water pump should energize.
3. Slowly lower the thermostat setting until the compressor is
energized. Regulate the water ow utilizing the P/T plugs
and compare to the performance tables.
4. Check the cooling refrigerant pressures against valves with
the tables .
5. Turn thermostat switch to the “off” position. The unit will
stop running and the reversing valve should de-energize.
6. Leave unit “off” for approximately ve minutes to allow
pressure to equalize.
7. Adjust thermostat to lowest setting.
8. Set thermostat switch to “heat” position.
9. Slowly adjust thermostat to higher temperature until com-
pressor energizes.
10. Compare the heating refrigerant pressure with valves with
the tables .
11. Check for vibrations, noise, water leaks, etc.
12. Adjust thermostat to correct mode and set to maintain
desired temperature.
13. Instruct the equipment owner/operator of correct thermostat
and system operation.
14. Be certain to complete and forward the warranty papers to
Daikin .
Maintenance Procedures
Proper maintenance is important to provide the most efcient
operation and longest life for your equipment. The following
points are to serve as a general guide. Always consult with your
maintenance contractor with regard to the specic requirements
of your own installation.
Paint Finish
The electrodeposition paint nish may be polished if de-
sired. Spray paint is available in case of accidental scratching
or chipping.
The following should be checked only by a competent
contractor.
Contactor Points
Check contactor points twice a year to see that they are not
burned or pitted as a result of low voltage, lightning strikes, or
other electrical difculties.
Water System
The water circulating pump should be checked and cleaned,
so that it is operating normally. Clogged coils lead to high head
pressures and inefcient operation. If coil is limed, a cleaning
treatment may be necessary. Water coils should be checked
yearly for liming or clogging.
Improper Unit Functioning
If unit is not performing properly, several readings of tem-
perature, pressure and electrical characteristics need to be taken.
The normal required troubleshooting information is listed on the
Check, Test and Start Form on page 40.
Notes: DO NOT place refrigeration gauges on system for
Check, Test and Start procedure. (To be used for
major service only.) To Installer: Fill out Check, Test
and Start Form on page 40 and leave copy with the
customer.

IM 1072-1 Water to Water Source Heat Pumps Page 9 of 44
Dimensional Data
WRA, WCA, WHA – Size 036-072
Dimensions - Size 036
Dimensions (in.) Pipe Size (FPT) Connection Size
A B C D E F G H J K L M N P Control Electric Auxiliary
Electric
Load
Source
Domestic
Hot Water
28⅛ 28⅛ 19 1¾ 6⅜ 95/16 211⅞ 17⅛ 4 1½ 14⅞ 10⅝ 8⅝ 1/2" KO 3/4" KO 1/2" KO 3/4" FPT 1/2" FPT
Dimensions - Size 048–060
Dimensions (in.) Pipe Size (FPT) Connection Size
A B C D E F G H J K L M N P Control Electric Auxiliary
Electric
Load
Source
Domestic
Hot Water
28⅛ 28⅛ 21 2¼ 7½ 3⅞ 2 13¾ 19 41½ 14⅞ 10⅝ 8⅝ 1/2" KO 3/4" KO 1/2" KO 1" FPT 1/2" FPT
Dimensions - Size 072
Dimensions (in.) Pipe Size (FPT) Connection Size
A B C D E F G H J K L M N P Control Electric Auxiliary
Electric
Load
Source
Domestic
Hot Water
28⅛ 28⅛ 21 911 /16 10⅝ 95/16 211½ 19 41½ 14⅞ 10⅝ 8⅝ 1/2" KO 3/4" KO 1/2" KO 1" FPT 1/2" FPT

Page 10 of 44 Water to Water Source Heat Pumps IM 1072-1
Dimensional Data
WRA, WCA, WHA – Size 120-180
Dimensions - Size 120 – 150
Dimensions (in.) Water Connection Size
A B C D E F G H K L M N P Q R S Load Source FPT
26¼ 19½ 12¼ 4½ 8⅜ 22¼ 4⅜ 18¾ 41 22⅛ 34 1 113/16 37 29¾ 42 1½"
Dimensions - Size 180
Dimensions (in.) Water Connection Size
A B C D E F G H K L M N P Q R S Load Source FPT
26¼ 19½ 12¼ 4½ 8⅜ 22¼ 4⅜ 18¾ 41 22⅛ 34 1 113/16 37 29¾ 42 2"