Installation and Maintenance Data
W ater to Water Source Heat Pumps 3 to 35 Tons
R-22 and R-407C Refrigerant / 60Hz
GRW - Extended Range Heating and Cooling models
GHW - Extended Range Heating only models
GCW - Extended Range Cooling only models
IM 816
Group: WSHP
Part Number: 667691801
Date: December 2004
©2004 McQuay International IM 816 (12-04)
Table of Contents
Nomenclature ........................................................................ 2
Safety Information ................................................................. 3
Specifications ........................................................................ 4
Pre Installation and Code Requirements.............................. 4
Wiring Diagrams ............................................................... 5-7
60 Hz - 1 Phase, Sizes 036-072 .................................... 5
50/60Hz - 3 Phase, Sizes 036-072................................ 6
60 Hz - 3 Phase, Sizes 120-420 .................................... 7
Installation ............................................................................. 8
Application ..........................................................................8-9
Dimensional Data ......................................................... 10-12
GRW, GHW, GCW, Size 036-072, 60Hz .................... 10
GRW, GHW, GCW, Size 120-180, 60Hz .................... 11
GRW, GHW, GCW, Size 240-420, 60Hz .................... 12
Nomenclature
NOTE: For illustration purposes only . Not all options available with all models.
Please consult your local McQuay Representative for specific availability .
W GRW 1 036 E F T F YY FS S C S R PVM
Product Category
W = WSHP
Product Identifier
GRW = Extended Range
Heating and Cooling Models
GHW = Extended Range
Heating Only Models
GCW = Extended Range
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
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
N = 380/50/3
Control Box Location
F = Front
L = Left Side Control Box
R = Right Side Control Box
Start Up................................................................................ 13
Maintenance Procedures .................................................... 13
Circuit Diagrams...........................................................14-16
GHW Circuit Diagram .................................................. 14
GRW Circuit Diagram .................................................. 15
GCW Circuit Diagram .................................................. 16
Replacement Parts List ....................................................... 17
Performance Tables ............................................................ 18
General Service Guide ........................................................ 19
Check, Test & Start Form.................................................... 20
Unit Function Information .................................................... 20
Cabinet Electrical
YYY = None
PVM =Phase Monitor
Monitors Voltage
and Phase Loss
Refrigerant
R = R-22
C = R-407C
Desuperheater
Y = None
D = Lead Compressor
Waste
Heat Recovery
Water Heater
Source Water to Refrigerant
Heat Exchanger Construction
C = Copper Inner Tube -
Steel Outer T ube
S = Cupro-Nickel Inner Tube -
Steel Outer T ube
Y = None
Construction Type
A = Standard
S = Severe Indoor Atmosphere
Protection
C = Corrosive Indoor Atmosphere
Protection
Freezestat
YY = None
FS = Adjustable for Geothermal and
Boiler/T ower Application
Status Lights
YY = None
SL = Three Lights-Compressor-1,
Compressor-2, Compressor fault
The information in this manual supersedes and replaces previous manuals with regard to McQuay products. Illustrations cover the general appearance of McQuay
products at the time of publication and McQuay reserves the right to make changes in design and construction at anytime without notice.
Page 2 of 20 / IM 816 (12-04) Water to Water Source Heat Pumps
Safety Information
Safe Operation Rules
Installation and maintenance are to be performed only by
qualified 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 installation
is complete.
!
CAUTION
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.
Sharp edges and coil surfaces are injury hazards. 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 immediate 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.
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
CAUTION 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 chlorodifluoromethane (HCFC-22), a
substance that harms public health and environment by
destroying ozone in the upper atmosphere. DO NOT
VENT HCFC-22 to the atmosphere. The U.S. Clean Air
Act requires the recovery of any residual refrigerant.
Water to Water Source Heat Pumps Page 3 of 20 / IM 816 (12-04)
SPECIFICATIONS
Voltage Model Size 036 048 060 072 120 150 180 240 300 360 420
Compressor
208/230-1-60
208/230-3-60
380/415-3-60
460-3-60
575-3-60
Ampacity (1) 20.2 23.3 30.4 37.7 N/A N/A N/A N/A N/A N/A N/A
Max. Fuse Size (2) 35 40 50 60 N/A N/A N/A N/A N/A N/A N/A
Compressor
Ampacity (1) 12.9 14.8 17.9 25.9 30 42 42 51 68 96 119
Max. Fuse Size (2) 20 25 30 45 40 60 60 70 90 125 150
Compressor
Ampacity (1) N/A N/A N/A N/A 15 21 21 25 36 40 54
Max. Fuse Size (2) N/A N/A N/A N/A 20 25 25 35 50 50 70
Compressor
Ampacity (1) 6.5 7.4 9 12.5 15 21 21 25 36 40 54
Max. Fuse Size (2) 15 15 15 20 20 25 25 35 50 50 70
Compressor
Ampacity (1) 5.4 6 7.2 9.4 12 16 17 19 28 31 48
Max. Fuse Size (2) 15 15 15 15 15 20 20 25 35 40 60
N/A = Not Applicable
RLA 16.1 18.6 24.3 30.1 N/A N/A N/A N/A N/A N/A N/A
LRA 88 104 131 144 N/A N/A N/A N/A N/A N/A N/A
RLA 10.3 11.8 14.3 20.7 12.9 18.6 18.6 22.5 30.2 42.4 52.6
LRA 77 88 91 128 91 128 156 164 225 245 425
RLA N/A N/A N/A N/A 6.5 9 9 10.9 15.6 17.7 23.8
LRA N/A N/A N/A N/A 48 65.5 75 100 114 125 187
RLA 5.2 5.9 7.2 10 6.5 9 9 10.9 15.6 17.7 23.8
LRA 39 44 46 63 46 63 75 100 114 125 187
RLA 4.3 4.8 5.7 7. 4 5.2 6.7 7.4 8.4 12.2 13.6 21.1
LRA 31 34 37 49 37 49 54 78 80 100 148
NOTES: (1) MINIMUM CIRCUIT AMPACITY
(2) MAXIMUM TIME DELAY FUSE OR HACR CIRCUIT BREAKER
As a result of continuing product improvement, all specifications and ratings are subject to change without notice.
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
!
WARNING
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 wiring must
be done in accordance with local codes or the national electric
code.
This unit contains chlorodifluoromethane (HCFC-22), a
substance that harms public health and environment by
destroying ozone in the upper atmosphere. DO NOT
VENT HCFC-22 to the atmosphere. The U.S. Clean Air
Act requires the recovery of any residual refrigerant.
Make a survey of the final 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.
Page 4 of 20 / IM 816 (12-04) Water to Water Source Heat Pumps
WIRING DIAGRAM 208/230-60-1 PHASE, UNIT SIZES 036, 048, 060 AND 072
Water to Water Source Heat Pumps Page 5 of 20 / IM 816 (12-04)
WIRING DIAGRAM 3 PHASE, UNIT SIZES 036, 048, 060 AND 072
Page 6 of 20 / IM 816 (12-04) Water to Water Source Heat Pumps
WIRING DIAGRAM 3 PHASE, UNIT SIZES 120, 150, 180, 240, 300, 360 AND 420
Water to Water Source Heat Pumps Page 7 of 20 / IM 816 (12-04)
INSTALLATION
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 floor. It is not necessary to anchor the unit to the
floor.
Unit Operating Shipping
Size Weight Weight
036 250 lbs 259 lbs
048 300 lbs 297 lbs
060 305 lbs 302 lbs
072 370 lbs 392 lbs
120 700 lbs 660 lbs
150 770 lbs 735 lbs
180 950 lbs 900 lbs
240 1,140 lbs 1,040 lbs
300 1,230 lbs 1,130 lbs
360 1,540 lbs 1,420 lbs
420 1,750 lbs 1,620 lbs
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 sufficient room to make water and electrical connections. If the unit is located in a confined space such as a closet,
provisions 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 unit connection 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 mineral content is the load or source load fluid. Never use flexible
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 flow 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 throttling characteristics, globe and gate valves should not be used,
all flow valves should be ball type.
!
CAUTION
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 field 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 specific system data must be
matched to industry standard pipe sizing charts.
T o 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 fittings.
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 (page 5) and three
phase diagram (pages 6 and 7).
8. The piping and wiring are now complete. Turn on water
supply to water heater. With an open hot water faucet, allow tank to fill. Bleed air from water lines. Check for water
leaks. Do not restore power to water heater until after you
have verified 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 .
APPLICATIONS
Cooling Tower/ Boiler Application Closed Loop
Cooling T ower 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.
Improper water flow in the system due to piping, valving or
improper pump operating will void the warranty.
Water piping exposed to outside may freeze.
Page 8 of 20 / IM 816 (12-04) Water to Water Source Heat Pumps
!
CAUTION
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 “flooded 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 T eflon taped thread sealant is recommended to minimize fouling 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 fitting may simplify the connections and
prevent vibration transmission to the building.
Before final connection to the unit, the supply and return
hose kits must be connected together and the system flushed 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 flow rate balancing. The return valve can be adjusted
to obtain the proper flow rate whenever the unit heats or cools.
Pressure/temperature ports recommended both supply and
return lines adjacent to the unit for system flow balancing. Flow
can be accurately set by measuring the refrigerant-to-water heat
exchangers water side pressure drop.
Well Water Application Open Loop
W ater 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 flow
rates by checking pressure drop across the heat exchanger. A void
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 compressor
contactor are recommended. Normally residential systems require about 2-gpm of flow 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 field, 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.
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, final
purging and charging of the loop is required. A flush/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
specific 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 flow through the unit by checking pressure drop across the heat exchanger and comparing it to the
performance tables shown on page 15 and 16. 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 fluid flow
rates.
Typical Load Side Applications
There are many load side applications for which the fluid to
fluid liquid chiller heat pumps can be used. The most popular
used would include: Hydronic baseboard heating, hydronic inslab floor heating, forced air fan coil heating or cooling, ice and
snow removal, heating potable water, heating swimming pools
and spas, and process fluid heating and cooling. When specifying load side heat transfer surface it is important to consider the
heat pump output capacities and fluid flow rates. Insufficient
load side heat transfer surface may cause unstable heat pump
operating. Pressure/temperature ports should always be used to
determine load side flow 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 flowing the heat exchanger which could cause erosion.
Proper pool PH levels and chemical balances must be maintained to avoid possible heat exchanger damage.
Water to Water Source Heat Pumps Page 9 of 20 / IM 816 (12-04)
Dimensional Data – GRW, GHW, GCW 036, 048, 060 and 072
60Hz Unit
Cabinet Dimensions Water Connection Sizes
Unit Width Depth Height Unit Load Domestic
Size A B C Size Source Hot Water
036 28-1/8 28-1/8 19 036 3/4" FPT ½" FPT
048 28-1/8 28-1/8 21 048 1" FPT ½" FPT
060 28-1/8 28-1/8 21 060 1" FPT ½" FPT
072 35-1/8 28-1/8 21 072 1" FPT ½" FPT
Piping Connection Location Dimensions
Unit Size D E F G H J
036 1-3/4 6-3/8 3-7/8 2 11-7/8 17-1/8
048 2-3/4 7-1/2 3-7/8 2 13-3/4 19
060 2-1/4 7-1/2 3-7/8 2 13-3/4 19
072 2-11/16 10-5/8 9-5/16 2 11-1/2 19
Page 10 of 20 / IM 816 (12-04) Water to Water Source Heat Pumps
Dimensional Data – GRW, GHW, GCW 120, 150 and 180
60Hz Unit
DIM ENSION / MODEL 120 - 150 180
CONNECTION LOC.
A,G
B,H
C,F
D,E
NOTE: ALL DIMENSIONS ARE IN INCHES AND ALL PIPE SIZES ARE IN FPT
LOAD OUT LOAD OUT
LOA D IN LOA D IN
SO URCE IN S OURCE O UT
SO URCE OUT S O URCE IN
Water to Water Source Heat Pumps Page 11 of 20 / IM 816 (12-04)
DIM. 120 - 150 180
A
B
C
D
E
F
G
H
PIPE SIZE
27 23 5/8
19 3/4 18 3/8
12 5/8 14 5/8
4 5/8 9 3/8
38 5/8 21 3/4
24 3/8 21 3/4
38 5/8 21 3/4
24 3/8 18 3/4
1 1/2 2
Dimensional Data – GRW, GHW, GCW 240, 300, 360 and 420
60Hz Unit
240 & 360 300 & 420
A
B
C
D
E
F
G
H
CONNECTION SI ZE
NOTE: ALL DIMENSIONS ARE IN INCHES AND ALL PIPE SIZES ARE IN FPT
Page 12 of 20 / IM 816 (12-04) Water to Water Source Heat Pumps
25 7/8 26 1/4
20 1/2 20 7/8
10 3/8 10 1/4
54 7/8
30 29 1/2
27 1/8 26 3/4
30 29 1/2
27 1/8 26 3/4
22
CONNECTION L O CAT IO N
A,G
B,H
C,F
D,E
240 - 420
LOAD OUT
LOA D IN
SO URCE OUT
SOURCE IN
START UP
Check the following before powering the unit.
• Avoid starting any electrical equipment for the first 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 flushed 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.
MAINTENANCE PROCEDURES
Proper maintenance is important to provide the most efficient 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 specific
requirements of your own installation.
Paint Finish
The electrodeposition paint finish may be polished if desired. 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 difficulties.
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 inefficient operation. If coil is limed, a cleaning
treatment may be necessary . W ater coils should be checked yearly
for liming or clogging.
Check, Test and Start
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 flow utilizing the P/T plugs
and compare to the performance tables on page 18.
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 five 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 compressor 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
McQuay .
Improper Unit Functioning
If unit is not performing properly, several readings of temperature, pressure and electrical characteristics need to be taken.
The normal required troubleshooting information is listed on
the Check, Test and Start Form on page 20.
Water to Water Source Heat Pumps Page 13 of 20 / IM 816 (12-04)
GHW CIRCUIT DIAGRAM
GHW
Load Coil = Heater-Condenser
Source Coil = Evaporator
Page 14 of 20 / IM 816 (12-04) Water to Water Source Heat Pumps
GRW CIRCUIT DIAGRAM
GRW
Reverse Cycle
No Domestic Hot Water
GRW
Reverse Cycle
With Domestic Hot Water H.R. Coil
Water to Water Source Heat Pumps Page 15 of 20 / IM 816 (12-04)
GCW CIRCUIT DIAGRAM
GCW
Load Coil = Chiller-Evaporator
Source Coil = Condenser
No Domestic Hot Water
GCW
Load Coil = Chiller-Evaporator
Source Coil = Condenser
With Domestic Hot Water H.R. Coil
Page 16 of 20 / IM 816 (12-04) Water to Water Source Heat Pumps
REPLACEMENT PARTS LIST
# Description 036 048 060 072 120 150 180 240 300 360 420
1 Expansion Valve* 564-376 564-397 564-450 546-436
Contactor
2
(Compressor)
3 Reversing Valve 564-411 564-286 564-286 564-289
Microprocessor
4
Board
Capacitor
5
(Compressor)
High Pressure
6
Switch (HP)
Low Pressure
7
Switch (LP1)
Fluid/Refrigerant
8
Coil S/W Copper
Fluid/Refrigerant
8
Coil S/W CU-NI
9 Transformer 846-073 846-073 846-073 846-073
Low pressure
10
switch (LP2)
11 Compressor 800-486 800-487 800-465 800-441
Reversing Valve
12
Coil
Refrigerant
13
Charge R-22 lb.
*Where same valve is used in two or more units superheat settings may differ. Consult factory for valve with correct setting.
841-077 841-077 841-077 841-077
843-253 843-253 843-253 843-253
856-115 856-116 856-117 856-079
844-079 844-079 844-079 844-079
844-041 844-041 844-041 844-041
512-193 512-194 512-194 512-263
512-200 512-201 512-201 512-259
844-062 844-062 844-062 844-062
874-083 874-083 874-083 874-083
2.8 4.4 4.4 6.25
Water to Water Source Heat Pumps Page 17 of 20 / IM 816 (12-04)
PERFORMANCE TABLES
COOLING MODE OPERATING PRESSURES (PSIG)
GRW & GCW MODELS
Entering Source Temperature °F
Leaving Load °F 50 70 90
SUCT DISCH SUCT DISCH SUCT DISCH
45 51 – 61 128 – 153 53 – 63 165–190 55–65 222–247
50 55 – 65 130 – 155 57 – 67 170–195 61–71 227–252
55 61 – 71 133 – 158 63 – 73 177–202 67–77 233–258
HEATING MODE OPERATING PRESSURES (PSIG)
GRW & GHW MODELS
Entering Entering Suction Discharge
Load°F Source°F Pressure Pressure
30 33 – 48 169 – 194
80
100
120
50 47 – 62 182 – 207
70 66 – 81 200 – 225
90 80 – 95 226 – 251
30 35 – 50 233 – 258
50 50 – 65 247 – 272
70 69 – 84 262 – 287
90 85–100 278 – 303
30 35 – 50 312 – 337
50 52 – 67 320 – 345
70 71 – 86 330 – 355
90 90 - 105 347 - 372
INTERNAL PRESSURE DROP CHART
Unit Load FT. Source FT. GPM
Size Pres. Drop Pres. Drop source/load
036 16.8 16.8 9.0
048 12.3 12.3 12.0
060 14.5 14.5 13.5
072 25.0 25.0 17.0
120 13.3 13.3 24.0
150 17.3 17.3 30.0
180 16.7 16.7 36.0
240 14.8 14.8 45.0
300 24.3 24.3 60.0
360 15.7 15.7 75.0
420 23.4 23.4 90.0
Page 18 of 20 / IM 816 (12-04) Water to Water Source Heat Pumps
GENERAL SERVICE GUIDE
All models employ an electromechanical control system for maximum reliability.
Symptom Possible Trouble Method of Finding
1. Noisy Operation. a. Chattering contactor noise. a. Check contactor points, check for adequate control
voltage from transformer, and check control circuit
for shorts or breaks, check thermostat.
2. Compressor will a. Lock Out Relay Open. a. Turn thermostat off, then on.
not start.
b. Loose electrical connections. b. Check all connections at contactor and compressor
terminal box for loose or burned connection on terminal.
c. Refrigerant charge lost, low pressure c . Check for R-22 pressure.
cutout open.
d. No control voltage to the compressor d. Check for 24 volts across contactor coil.
contactor. If no voltage, check for thermostat circuit trouble
or for compressor safety controls open.
e. Contactor pulled in, but compressor still e. Check compressor overload circuit, contactor points, etc.
won’t start.
3. Compressor starts but a. Run capacitor could be bad. a. Check capacitor.
hums and trips out
on overload. b. Voltage may be low. b. Check it.
c. Seized bearings on compressor. c . Replace compressor.
4. Compressor starts but a. Low liquid flow (heating cycle). a. Check liquid flow.
cuts out on low
pressure control. b. Low refrigerant charge. b. Remove refrigerant, repair leak and recharge.
c. Restriction in liquid refrigerant line. c. Check pressures and look for frosting across
the restriction.
d. Low airflow (cooling cycle). d. Check and correct.
e. Low pressure cutout may have incorrect e. Check low pressure cutout for correct pressure.
pressure function.
5. Compressor starts a. Condenser coils limed or restricted. a . Check it. (Open systems)
but cuts out on high
pressure control. b. Malfunctioning high pressure control. b. Check that the control is cutting out at the correct
pressure.
c. Reduced or lack of liquid flow. c. Check liquid.
d. Reduced evaporator air flow d. Check air flow.
(heating cycle).
6. Compressor runs on a . Reversing valve may be defective. a. See that it has shifted.
heating cycle,
but does not heat. b. Thermostat may be defective. b. Check wiring diagram.
Water to Water Source Heat Pumps Page 19 of 20 / IM 816 (12-04)
CHECK, TEST AND START FORM
General Information
Customer Name ____________________________________ Dealer Name _____________________________________
Address___________________________________________ Address__________________________________________
_________________________________________________ ________________________________________________
_________________________________________________ ________________________________________________
Phone # __________________________________________ Phone # _________________________________________
Product Information
Unit Model # ____________________________________________________________
Unit Serial # ____________________________________________________________
Source Coil Application Ground Source Open Well Other _________________
Load Coil Application Fan Coil Unit Radiant Htg/Clg Coils Baseboard Radiation
Other ____________________________________________
Voltage ____________ Amperage _______________ Phase _______________ Transformer Volts ________________
UNIT FUNCTION
HEATING (GRW & GHW) ENTERING LEAVING DIFF (TD)
Load Liquid Temperature, °F
From fan coil unit, radiant coils,
baseboard radiation, etc. ________________ _________________ ________________
Source Liquid Temperature, °F
From well, geothermal closed loop,
plate heat exchanger, etc. ________________ _________________ ________________
COOLING (GRW & GCW)
Load Liquid Temperature, °F
To fan coil unit, radiant coils,
baseboard radiation, etc. _________________ ________________ ________________
Source Liquid Temperature, °F
From well, geothermal closed loop,
plate heat exchanger, etc. _________________ ________________ ________________
Load Fluid Pressure FT. HD or PSIG
[Note 1 PSIG = 2.31 FT. HD] _________________ _______________ _________________
Source Fluid Pressure _________________ _______________ _________________
Load GPM ___________________ Source GPM _________________
Source Fluid Water Anti-freeze
HA or HR = 500 x TD x GPM For Anti-Freeze solution = 485 x TD x GPM
Calculation __________ x __________ x __________ = ________________
(Load) 500 or 485 TD GPM HA or HR
Check product performance tables on page 18 to determine if calculation is within 10% of table value.
4900 Technology Park Boulevard • Auburn, New York 13021-9030 • 1.800.432.1342 • USA Page 20 of 20 / IM 816 (12-04)
©2004 McQuay International
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