ClimateMaster Genesis Series Owner's manual

WATER-TO-WATER
INSTALLATION, OPERATION & MAINTENANCE
GENESIS WATER-TO-WATER (GSW) SERIES
Model Nomenclature 3
General Information 4
Physical Data 5
GSW 036 & 060 Dimensional Data 6
GSW 120 Dimensional Data 7
Installation 8
Piping Installation 8
Load Plumbing Installation 9
Water-Loop Heat Pump Application 10
Ground-Water Heat Pump Application 11
Water Quality Standards 12
Ground-Loop Heat Pump Application 13
Electrical - Power Wiring 15
Electrical - Low Voltage Wiring 18
Wiring Diagrams 19
Unit Starting & Operating Conditions 26
Piping System Cleaning
& Flushing Procedure 27
Unit & System Checkout 28
Unit Start-Up Procedure 29
Preventive Maintenance 30
Revision History 32
Table of Contents
Genesis Series
GSW036, 60 & 120
Water-to-Water
Heat Pumps
Revision: 16 Oct, 2008B

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THE SMART SOLUTION FOR ENERGY EFFICIENCY
Genesis Water-to-Water (GSW) Series
Rev.: 16 Oct, 2008B
Model Nomenclature
G
1
S
2
W
3
0
4
3
5
6
6
A
7
F
8
D
9
1
10
0
11
C
12
F
13
C
14
S
15
Series
Configuration
Size
Revision
Electrical Characteristics
Controls
Cabinet
HWG Options
Water Connection Location
Source/Outdoor Coil
Standard
Load/Indoor Coil
GS =Genesis Series
W = Water to Water
036 = 36,000 nominal cooling
060
120
A = Product Release
G = 208-230/60/1
E = 265/60/1
H = 208-230/60/3
F = 460/60/3
V = 200-220/50/1
U = 380-420/50/3
N = 575/60/3
C = CXM Controller
D = DXM Controller (see note 2)
L = CXM with LON (see note 2)
M = DXM with LON (see note 2)
0 = Distributor Class (G volt only) see note 1
1 = Commercial Extended Range w/ insul
2 = Commercial Extended Range w/ Mute
5 = Distributor Class Mute (G Volt only) see note 1
0 = None
1 = HWG w/Internal pump (Distributor Class
G Volt 036-060 Only)
2 = HWG Coil Only (Commercial Class 036-
060 Only)
C = Copper
N = Cupro-Nickel
V = Double wall vented
F = Front water connections
R = Right water (120 only)
L = Left water (120 only)
B = Back water (120 only)
S = Standard
NOTES:
1. Distributor class units come standard with 75VA
transformer.
2. Commercial Class only
Revision: 04/11/08B
C = Copper
N = Cupro-Nickel

ClimateMaster Water-Source Heating and Cooling Systems
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Genesis Water-to-Water (GSW) Series
Rev.: 16 Oct, 2008B
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General Information
 WARNING! 
Inspection
Upon receipt of the equipment, carefully check the
shipment against the bill of lading. Make sure all units
have been received. Inspect the carton or crating of
each unit, and inspect each unit for damage. Assure
the carrier makes proper notation of any shortages or
damage on all copies of the freight bill and completes a
common carrier inspection report. Concealed damage
not discovered during unloading must be reported to the
carrier within 15 days of receipt of shipment. If not filed
within 15 days, the freight company can deny the
claim without recourse. Note: It is the responsibility
of the purchaser to file all necessary claims with the
carrier. Notify the ClimateMaster Traffic Department of
all damage within fifteen (15) days of shipment.
Storage
Equipment should be stored in its shipping carton in a
clean, dry area. Store units in an upright position at all
times. Stack units a maximum of 3 units high.
Unit Protection
Cover units on the job site with either shipping cartons,
vinyl film, or an equivalent protective covering. Cap
the open ends of pipes stored on the job site. In areas
where painting, plastering, and/or spraying has not
been completed, all due precautions must be taken to
avoid physical damage to the units and contamination
by foreign material. Physical damage and contamination
may prevent proper start-up and may result in costly
equipment clean-up.
Examine all pipes, fittings, and valves before installing
any of the system components. Remove any dirt or trash
found in or on these components.
Pre-Installation
Installation, Operation, and Maintenance instructions
are provided with each unit.. The installation site chosen
should include adequate service clearance around the
unit. Before unit start-up, read all manuals and become
familiar with the unit and its operation. Thoroughly check
the system before operation.
Prepare units for installation as follows:
1. Compare the electrical data on the unit nameplate
with ordering and shipping information to verify that
the correct unit has been shipped.
2. Keep the cabinet covered with the shipping carton
until installation is complete and all plastering,
painting, etc. is finished.
3. Verify refrigerant tubing is free of kinks or dents and
that it does not touch other unit components.
4. Inspect all electrical connections. Connections must
be clean and tight at the terminals.
5. Loosen compressor bolts on units equipped with
compressor spring vibration isolation until the
compressor rides freely on the springs. Remove
shipping restraints.
6. Locate and verify any HWG or other accessory kit
located in the compressor section.
DO NOT store or install units in corrosive environments
or in locations subject to temperature or humidity
extremes (e.g., attics, garages, rooftops, etc.) Corrosive
conditions and high temperature or humidity can
significantly reduce performance, reliability, and service
life. Always move units in an upright position. Tilting
units on their sides may cause equipment damage.
 WARNING! 
To avoid the release of refrigerant into the atmosphere,
the refrigerant circuit of this unit must be serviced
only by technicians who meet local, state, and federal
proficiency requirements.
All refrigerant discharged from this unit must be
recovered WITHOUT EXCEPTION. Technicians must
follow industry accepted guidelines and all local, state,
and federal statutes for the recovery and disposal of
refrigerants.
If a compressor is removed from this unit, system
refrigerant circuit oil will remain in the compressor. To
avoid leakage of compressor oil, the refrigerant lines of
the compressor must be sealed after it is removed.

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THE SMART SOLUTION FOR ENERGY EFFICIENCY
Genesis Water-to-Water (GSW) Series
Rev.: 16 Oct, 2008B
Physical Data
Model 036 060 120
Compressor (qty) Scroll (1) Scroll (2)
Factory Charge R22 (oz) [kg] 48 [1.36] 64 [1.81] (2) 64 [1.81]
Indoor/Load Water Connection Size
Residential Swivel (in) 1 1 -
Commecial IPT (in) 3/4 1 1-1/2
Outdoor/Source Water Connection Size
Residential Swivel (in) 1 1 -
Commecial IPT (in) 3/4 1 1-1/2
Hot Water Generator Connection Size
Residential Swivel (in) 1 1 -
Commecial IPT (in) 1/2 1/2 1/2
Weight - Operating, (lbs) [kg] 236 [107] 343 [156] 725 [329]
Weight - Packaged, (lbs) [kg] 255 [116] 362 [164] 765 [347]
Spring mounted compressor
Balanced Port Expansion Valve (TXV)
Insulated Source and Load Water Coils with optional
water/refrigerant circuit insulation package
Compressor on (green) and fault (red) light
Check serial plate for refrigerant type

ClimateMaster Water-Source Heating and Cooling Systems
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Genesis Water-to-Water (GSW) Series
Rev.: 16 Oct, 2008B
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3/4" IPT
3/4" IPT
3/4" IPT
3/4" IPT
1/2" IPT
1/2" IPT
1" IPT
1" IPT
1" IPT
1" IPT
1/2" IPT
1/2" IPT
Alternate
Service Access
Panel
Service Access
3' [91cm] Recommend
GSW036 & 060 Dimensional Data
Notes:
1. Front & Side access is preferred for service access.
However, all components may be serviced from the front
access panel if side access is not available.
2. While clear access to all removable panels is not required,
installer should take care to comply with all building codes
and allow adequate clearance for future field service.
Model
Overall Cabinet
Water Connections Electrical
Knockouts
1 234 56
A
Width
B
Depth
C
Height
D
Source
(Outdoor)
Water In
E
Source
(Outdoor)
Water Out
F
Load
(Indoor)
Water In
G
Load
(Indoor)
Water Out
H
HWG
In
J
HWG
Out
K
Low
Voltage
L
External
Pump
M
Power
Supply
036 in.
cm.
25.6
65.1
22.4
56.8
29.5
74.9
2.4
6.1
5.4
13.7
22.7
57.5
26.1
66.3
13.9
35.3
16.9
42.9
5.6
15.2
9.6
24.1
12.1
30.5
060 in.
cm.
30.6
77.8
25.4
64.5
33.0
83.8
2.4
6.1
5.4
13.7
26.8
68.1
30.9
78.4
15.6
40.4
18.9
48.0
8.1
20.3
11.6
29.2
14.1
35.6

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THE SMART SOLUTION FOR ENERGY EFFICIENCY
Genesis Water-to-Water (GSW) Series
Rev.: 16 Oct, 2008B
GSW120 Dimensional Data
Notes:
1. Front & Side access is
preferred for service access.
However, all components may
be serviced from the front
access panel if side access is
not available.
2. While clear access to all
removable panels is not
required, installer should
take care to comply with all
building codes and allow
adequate clearance for future
field service.

ClimateMaster Water-Source Heating and Cooling Systems
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Genesis Water-to-Water (GSW) Series
Rev.: 16 Oct, 2008B
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 CAUTION! 
Installation of Supply and Return Piping
Follow these piping guidelines.
1. Install a drain valve at the base of each supply and
return riser to facilitate system flushing.
2. Install shut-off / balancing valves and unions at each
unit to permit unit removal for servicing.
3. Place strainers at the inlet of each system
circulating pump.
4. Select the proper hose length to allow slack between
connection points. Hoses may vary in length by +2%
to -4% under pressure.
5. Refer to Table 1. Do not exceed the minimum bend
radius for the hose selected. Exceeding the minimum
bend radius may cause the hose to collapse which
reduces water flow rate. Install an angle adapter to
avoid sharp bends in the hose when the radius falls
below the required minimum.
Insulation is not required on loop water piping except
where the piping runs through unheated areas or outside
the building or when the loop water temperature is below
the minimum expected dew point of the pipe ambient.
Insulation is required if loop water temperature drops
below the dew point.
Pipe joint compound is not necessary when Teflon
threaded tape is pre-applied to hose assemblies or when
flared-end connections are used. If pipe joint compound
is preferred, use compound only in small amounts on the
male pipe threads of the fitting adapters. Prevent sealant
from reaching the flared surfaces of the joint.
Note: When anti-freeze is used in the loop, assure
that it is compatible with Teflon tape or pipe joint
compound employed.
Maximum allowable torque for brass fittings is 30 foot-
pounds. If a torque wrench is not available, tighten finger-tight
plus one quarter turn. Tighten steel fittings as necessary.
Table 1: Metal Hose Minimum Bend Radii
Piping Installation
GSW Unit Location
These units are not designed for outdoor installation.
Locate the unit in an INDOOR area that allows
enough space for service personnel to perform typical
maintenance or repairs.
The installation of water source heat pump units and
all associated components, parts and accessories
which make up the installation shall be in accordance
with the regulations of ALL authorities having
jurisdiction and MUST conform to all applicable
codes. It is the responsibility of the Installing
Contractor to determine and comply with ALL
applicable codes and regulations.
Installation
Locate the unit in an indoor area that allows easy
removal of access panels, and has enough space for
service personnel to perform maintenance or repair.
Provide sufficient room to make water and electrical
connections.. Any access panel screws that would be
difficult to remove after the unit is installed should be
removed prior to setting the unit. These units are not
approved for outdoor installation and, therefore, must
be installed inside the structure being conditioned. Do
not locate in areas where ambient conditions are not
maintained within 40-100°F.
Piping must comply with all applicable codes.
Hose Diameter Minimum Bend Radius
1/2” [12.7mm] 2-1/2” [63.5mm]
3/4” [19.1mm] 4” [101.6mm]
1” [25.4mm] 5-1/2” [139.7mm]
1-1/4” [31.8mm] 6-3/4” [171.5mm]

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THE SMART SOLUTION FOR ENERGY EFFICIENCY
Genesis Water-to-Water (GSW) Series
Rev.: 16 Oct, 2008B
Optional pressure-rated hose assemblies designed
specifically for use with ClimateMaster units are available.
Similar hoses can be obtained from alternate suppliers.
Supply and return hoses are fitted with swivel-joint
fittings at one end to prevent kinking during installation.
Refer to Figure 1 for an illustration of a Supply/Return
Hose Kit. Male adapters secure hose assemblies to the
unit and risers. Install hose assemblies properly and
check them regularly to avoid system failure and reduced
service life.
 CAUTION! 
Corrosive system water requires corrosion resistant
fittings and hoses and possibly water treatment.
 WARNING! 
Do not bend or kink supply lines or hoses.
Rib Crimped
Length
(2 ft [0.6m] Length Standard)
Swivel
Brass
Fitting
Brass
Fitting
EPT
Figure 1: Supply/Return Hose Kit
GSW Unit Load Plumbing
Theapplicationsaretoovariedtodescribeinthisdocument,
however some basic guidelines will be presented. Much of
thediscussionsonwaterloopapplicationswouldbevalidfor
the load plumbing discussion as well. All plumbing should
conform to local codes and consider the following:
Wide temperature variation applications such as
heating/cooling coils
- Employ piping materials that are rated for the
maximum temperature and pressure combination.
This excludes PVC for most heating applications.
- Insure load water flow in high temperature heating
applications is at least 3 gpm per ton to improve
performance and reduce nuisance high pressure faults.
Load Plumbing Installation
- Should NOT employ plastic to metal threaded joints
- Utilize a pressure tank and air separator vent system
to equalize pressure and remove air.
Potable Water Applications
- Load coax material should always be vented double
walled for use in potable water systems.
- Insure load water flow in high temperature heating
applications is at least 3 gpm per ton to improve
performance and reduce nuisance high pressure faults.
NOTE: ClimateMaster strongly recommends all
piping connections, both internal and external to the
unit, be pressure tested by an appropriate method
prior to any finishing of the interior space or before
access to all connections is limited. Test pressure
may not exceed the maximum allowable pressure for
the unit and all components within the water system.
ClimateMaster will not be responsible or liable for
damages from water leaks due to inadequate or
lack of a pressurized leak test, or damages caused
by exceeding the maximum pressure rating during
installation.
Piping Installation

ClimateMaster Water-Source Heating and Cooling Systems
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Genesis Water-to-Water (GSW) Series
Rev.: 16 Oct, 2008B
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Water-Loop Heat Pump Applications
Commercial systems typically include a number of units
plumbed to a common piping system. Any unit plumbing
maintenance work can introduce air into the piping system,
therefore air elimination equipment is a major portion of the
mechanical room plumbing. In piping systems expected
to utilize water temperatures below 50°F, 1/2" closed
cell insulation is recommended on all piping surfaces to
eliminate condensation. Metal to plastic threaded joints
should never be employed due to their tendency to leak
over time. All non-distributor class units include a low
temperature-soldered bracket-supported FPT water
connection. Teflon tape thread sealant is recommended
to minimize internal fouling of the heat exchanger. Do not
overtighten connections and route piping so as not to
interfere with service or maintenance access. Hose kits are
available from ClimateMaster in different configurations as
shown in Figure 2 for connection between the GSW Series
and the piping system. The hose kits include shut off valves,
P/T plugs for performance measurement, high pressure
stainless steel braid hose, "Y" type strainer with blowdown
valve, and "J" type swivel connection. Balancing valves
to facilitate the balancing of the system, and an external
low pressure drop solenoid valve for use in variable speed
pumping systems, may also be included in the hose kit.
Figure 2: Typical Water Loop Application. GSW036-060 shown GSW120 is similar.
The piping system should be flushed to remove dirt, piping
chips, and other foreign material prior to operation. See
Piping System Cleaning and Flushing Procedures. The
flow rate is usually set between 2.25 and 3 gpm per ton
of cooling capacity. ClimateMaster recommends 2.5 gpm
per ton for most applications of water loop heat pumps.
To insure proper maintenance and servicing, P/T ports are
imperative for temperature and flow verification, as well as
performance checks.
Cooling Tower/Boiler Systems typically utilize a common
loop maintained 60-90°F. The use of a closed circuit
evaporative cooling tower with a secondary heat exchanger
between the tower and the water loop is recommended. If
an open type cooling tower is used continuously, chemical
treatment and filtering will be necessary.
Low Water Temperature Cutout Setting
CXM or DXM Control:
When an antifreeze is selected, the FP1 jumper (JW3)
should be clipped to select the low temperature
(Antifreeze 13°F) setpoint to avoid nuisance faults. See
Low Water Temperature Cutout Selection.
Air Pad or
Extruded
polystyrene
insulation board
Concrete
block or
brick
Unit Power
Disconnect
Thermostat
Wiring
Optional
Balancing
Valve
Y-Strainer
with blow-off
valve
Water In
Water Out
Optional Low
Pressure Drop
Water Control
Valve
Ball Valve with
integral P/T plug
Ball Valve with
integral P/T plug
Stainless steel braid
hose with integral “J”
swivel
Building
Loop
Load Plumbing
Connection

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THE SMART SOLUTION FOR ENERGY EFFICIENCY
Genesis Water-to-Water (GSW) Series
Rev.: 16 Oct, 2008B
Typical open loop piping is shown in Figure 3. Shut
off valves should be included in case of servicing.
Boiler drains or other valves should be ‘tee’d’ into the
line to allow acid flushing of just the heat exchanger.
Pressure temperature plugs should be used so that
flow and temperature can be measured. The water
freezestat should be wired. Piping materials should be
limited to PVC SCH80 or copper. Due to the pressure
and temperature extremes, PVC SCH40 is not
recommended. Water quantity should be plentiful and of
good quality. Consult Table 2 for water quality guidelines.
The unit can be ordered with either a copper or cupro-
nickel water heat exchanger. Copper is recommended
for closed loop systems and open loop ground
water systems that are not high in mineral content or
corrosiveness. In conditions anticipating heavy scale
formation or in brackish water, a cupro-nickel heat
exchanger is recommended. In ground water situations
where scaling could be heavy or where biological growth
such as iron bacteria will be present, a closed loop
system is recommended. Heat exchanger coils may over
time lose heat exchange capabilities due to a build up of
mineral deposits inside. These can be cleaned only by a
qualified service mechanic as acid and special pumping
equipment are required.
Desuperheater coils can likewise become scaled and
possibly plugged. In areas with extremely hard water, the
homeowner should be informed that the heat exchanger
may require occasional acid flushing.
Expansion Tank and Pump
Use a closed, bladder-type expansion tank to minimize
mineral formation due to air exposure. The expansion
tank should be sized to handle at least one minute run
time of the pump to prevent premature pump failure
using its drawdown capacity rating. The pump should be
sized to the home’s domestic water load (5-9 gpm) plus
the heat pump water load. Discharge water from the unit
is not contaminated in any manner and can be disposed
of in various ways depending on local building codes; i.e.
recharge well, storm sewer, drain field, adjacent stream
or pond, etc. Most local codes forbid the use of sanitary
sewer for disposal. Consult your local building and
zoning department to assure compliance in your area.
Water Control Valve
Note the placement of the water control valve. Always
maintain water pressure in the heat exchanger by
placing water control valves at the outlet of the unit to
prevent mineral precipitation. Pilot operated or Taco
slow closing valve’s solenoid valves are recommended
Ground-Water Heat Pump Systems
to reduce water hammer. If water hammer persists, a
mini-expansion tank can be mounted on the piping to
help absorb the excess hammer shock. Insure that the
total ‘VA’ draw of the valve can be supplied by the unit
transformer. For instance the Taco slow closing valve
can draw up to 35VA. This can overload smaller 40 or
50 VA transformers depending on the other controls
employed. A typical pilot operated solenoid valve draws
approximately 15VA. Note the special wiring diagram of
the AVM valve (Figure 9).
Flow Regulation
Flow regulation can be accomplished by two methods.
First, some water control valves have a built in flow
adjustment. By measuring the pressure drop through the
unit heat exchanger, flow rate can be determined and
compared to Table 7. Since the pressure is constantly
varying, two pressure gauges might be needed. Simply
adjust the water control valve until the desired flow
of 1.5 to 2 gpm per ton is achieved. Secondly, a flow
control device may be installed. The devices are typically
an orifice of plastic material that is designed to allow
a specified flow rate. These are mounted on the outlet
of the water control valve. On occasion, these valves
can produce a velocity noise that can be reduced by
applying some back pressure. This is accomplished by
slightly closing the leaving isolation valve of the well
water setup.
Low Temperature Cutout
The water low temperature cutout setpoint should be
activated to avoid freeze damage to the unit. Consult
the low temperature cutout section of the controls
description for instructions.

ClimateMaster Water-Source Heating and Cooling Systems
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Genesis Water-to-Water (GSW) Series
Rev.: 16 Oct, 2008B
IOM
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Table 2: Water Quality Standards
Figure 3: Typical Open Loop/ Well Application. GSW036-060 shown GSW120 is similar.
Air Pad or
Extruded
polystyrene
insulation board
Concrete
block or
brick
Unit Power
Disconnect
Thermostat Wiring
Pressure
Tank
Shut-Off
Valve
Boiler
Drains
Flow
Regulator
P/T Plugs
Water In
Water Out
Water
Control
Valve
Optional
Filter
Load Plumbing
Connections
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Ground-Water Heat Pump Systems

IOM
13
climatemaster.com
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Genesis Water-to-Water (GSW) Series
Rev.: 16 Oct, 2008B
Ground-Loop Heat Pump Applications
Piping Installation
The typical closed loop ground source system is shown in
Figure 4. All earth loop piping materials should be limited
to only polyethylene fusion in inground sections of the
loop. Galvanized or steel fitting should not be used at any
time due to their tendency to corrode. All plastic to metal
threaded fittings should be avoided due to their potential
to leak in earth coupled applications and a flanged fitting
substituted. P/T plugs should be used so that flow can
be measured using the pressure drop of the unit heat
exchanger in lieu of other flow measurement means. Earth
loop temperatures can range between 25-110°F and 2.25 to
3 gpm of flow per ton of cooling capacity is recommended
in these applications. Upon completion of the ground loop
piping, pressure test the loop to assure a leak free system.
Horizontal Systems: test individual loops as installed. Test
entire system when all loops are assembled.
Vertical U-Bends and Pond Loop Systems: test vertical U-
bends and pond loop assemblies prior to installation with
a test pressure of at least 100 psi. Either water or air may
be used as the testing medium.
Flushing the Earth Loop
Once piping is completed between the unit, flow controller
and the ground loop (Figure 4), final purging and charging
of the loop is needed. A flush cart (at least a 1.5 hp
pump) is needed to achieve adequate flow velocity in the
loop to purge air and dirt particles from the loop itself.
An antifreeze solution is used in most areas to prevent
freezing. All air and debris must be removed from the
earth loop piping system before operation. Flush the loop
with a high volume of water at a high velocity (2 fps in all
piping) both directions. The steps below must be followed
for proper flushing. Fill loop with water from a garden
hose through flush cart before using flush cart pump to
ensure an even fill. Once full, do not allow the water level
in the flush cart tank to drop below the pump inlet line
or air can be pumped back out to the earth loop. Try to
maintain a fluid level in the tank above the return tee so
that air can not be continuously mixed back into the fluid.
50 psi surges can be used to help purge air pockets by
simply shutting off the return valve going into the flush
cart reservoir. This ‘dead heads’ the pump to 50 psi. To
dead head the pump until maximum pumping pressure is
reached, open the valve back up and a pressure surge will
be sent through the loop to help purge air pockets from
the piping system. Notice the drop in fluid level in the flush
cart tank. If air is purged from the system, the level will
drop only 1-2 inches in a 10" diameter PVC flush tank
(about a half gallon) since liquids are incompressible.
If the level drops more than this, flushing should continue
since air is still being compressed in the loop fluid. Do this
a number of times.
When the fluid level drops less than 1-2" in a 10" diameter
tank the flow can be reversed. Finally the dead head test
should be checked again for an indication of air in the
loop. This fluid level drop is your only indication of air
in the loop.
Table 3: Approximate Fluid Volume (gal.) per 100'
of Pipe
Table 4: Antifreeze Percentages by Volume
Pipe Size Volume
Copper 1”
1.25”
1.5”
4.1
6.4
9.2
Rubber Hose 1” 3.9
Polyethylene
3/4” IPS SDR11
1” IPS SDR11
1.25” IPS SDR11
1.5” IPS SDR11
2” IPS SDR11
1.25” IPS SCH40
1.5 IPS SCH40
2” IPS SCH40
2.8
4.5
8.0
10.9
18.0
8.3
10.9
17.0
Unit Heat Exchanger Typical 1.0
Flush Cart Tank 10” diameter x 3ft 10.0
Type Minimum Temperature for Low Temperature Protection
10°F [-12.2°C] 15°F [-9.4°C] 20°F [-6.7°C] 25°F [-3.9°C]
Methanol
100% USP food grade Propylene Glycol
Ethanol*
25%
38%
29%
21%
25%
25%
16%
22%
20%
10%
15%
14%
* Must not be denatured with any petroleum based product

ClimateMaster Water-Source Heating and Cooling Systems
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Genesis Water-to-Water (GSW) Series
Rev.: 16 Oct, 2008B
IOM
14
Figure 4: Typical Earth Loop Connection. GSW036-060 shown, GSW120 requires larger pump than AFSC2
please consult the factory.
Antifreeze may be added before, during, or after the
flushing procedure. However, depending upon which time
is chosen, antifreeze could be wasted when emptying the
flush cart tank. See antifreeze section for more details.
Loop static pressure will fluctuate with the seasons.
Pressures will be higher in the winter months than during
the cooling season. This fluctuation is normal and should
be considered when charging the system initially. Run the
unit in either heating or cooling for a number of minutes to
condition the loop to a homogenous temperature. This is
a good time for tool cleanup, piping insulation etc. Then
final flush and pressurize the loop to a static pressure of
40-50 psi (winter) 15-20 psi (summer).
After pressurization, be sure to remove the plug in the
end of the Grundfos loop pump motor(s) to allow trapped
air to be discharged and to insure the motor housing has
been flooded. This is not required for Taco circulators.
Insure the loop flow controller provides adequate flow
through the unit by checking pressure drop across the
heat exchanger and comparing it to the figures shown in
Table 7.
Antifreeze
In areas where minimum entering loop temperatures
drop below 40°F or where piping will be routed through
areas subject to freezing, antifreeze is needed. Alcohols
and glycols are commonly used as antifreezes, however
your local territory manager should be consulted for the
antifreeze best suited to your area. Freeze protection
should be maintained to 15°F below the lowest expected
entering loop temperature. For example, if 30°F is the
minimum expected entering loop temperature, the leaving
loop temperature would be 25-22°F and freeze protection
should be at 15°F (30°F-15°F=15°F). All alcohols should
be premixed and pumped from a reservoir outside of the
building when possible or introduced under water level
to prevent fuming. Initially calculate the total volume of
fluid in the piping system using Table 3. Then use the
percentage by volume shown in Table 4 for the amount of
antifreeze. Antifreeze concentration should be checked
from a well mixed sample using a hydrometer to measure
specific gravity.
Low Water Temperature Cut-Out Setting
When an antifreeze is selected the low temperature limit
setpoint should be switched to the lower setting to avoid
nuisance faults. Consult Low Water Temperature Cut-
Out Setting in the controls section for more information.
Ground-Loop Heat Pump Applications

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climatemaster.com
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Genesis Water-to-Water (GSW) Series
Rev.: 16 Oct, 2008B
Electrical - Line Voltage
 WARNING! 
To avoid possible injury or death due to electrical
shock, open the power supply disconnect switch and
secure it in an open position during installation.
 CAUTION! 
Use only copper conductors for field installed electrical
wiring. Unit terminals are not designed to accept other
types of conductors.
 WARNING! 
Disconnect electrical power source to prevent injury or
death from electrical shock.
Model Voltage
Code Voltage Min/Max Voltage
Compressor HWG
Pump
FLA
Ext Loop
Pump
FLA
Total
Unit
FLA
Min
Circuit
Amps
Max
Fuse/
HACR
QTY RLA LRA
GSW036
Residential G 208-230/60/1 197/254 1 15.0 73.0 0.4 4.0 19.4 23.2 35
GSW036
Commer-
cial
G 208-230/60/1 197/254 1 15.0 73.0 - - 15.0 18.8 30
E 265/60/1 239/292 1 14.3 71.0 - - 14.3 17.9 30
H 208-230/60/3 197/254 1 10.7 63.0 - - 10.7 13.4 20
F 460/60/3 414/506 1 5.0 31.0 - - 5.0 6.3 15
GSW060
Residential G 208-230/60/1 197/254 1 28.0 148.0 0.4 4.0 32.4 39.4 60
GSW060
Commer-
cial
G 208-230/60/1 197/254 1 28.0 148.0 - - 28.0 35.0 60
H 208-230/60/3 197/254 1 19.3 123.0 - - 19.3 24.1 40
F 460/60/3 414/506 1 7.5 49.5 - - 7.5 9.4 15
N 575/60/3 518/633 1 6.4 40.0 - - 6.4 8.0 15
GSW120
Commecial
G 208-230/60/1 197/254 2 28.0 148.0 - - 56.0 63.0 90
H 208-230/60/3 197/254 2 19.3 123.0 - - 38.6 43.4 60
F 460/60/3 414/506 2 7.5 49.5 - - 15.0 16.9 20
N 575/60/3 518/633 2 6.4 40.0 - - 12.8 14.4 20
HACR circuit breaker in USA only
Residential units come standard with 75VA transformer, HWG pump, and HWG connections

ClimateMaster Water-Source Heating and Cooling Systems
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Genesis Water-to-Water (GSW) Series
Rev.: 16 Oct, 2008B
IOM
16
All field installed wiring, including electrical ground, must
comply with the National Electrical Code as well as all
applicable local codes.
Refer to the unit wiring diagrams for fuse sizes and a
schematic of the field connections which must be made
by the installing (or electrical) contractor.
Consult the unit wiring diagram located on the inside of
the compressor access panel to ensure proper electrical
hookup.
All final electrical connections must be made with a
length of flexible conduit to minimize vibration and sound
transmission to the building.
Figure 5a: GSW036-060 Series Line Voltage Field
Wiring Distributor Class
General Line Voltage Wiring
Be sure the available power is the same voltage and phase
as that shown on the unit serial plate. Line and low voltage
wiring must be done in accordance with local codes or the
National Electric Code, whichever is applicable.
GSW Power Connection
Line voltage connection is made by connecting the
incoming line voltage wires to the “L” side of the
contactor or power block as shown in Figures 5a, b and
c. Consult Table 5 for correct fuse size.
208 Volt Operation
All 208-240 Volt units are factory wired for 208
Volt. The transformers may be switched to 240V
operation as illustrated on the wiring diagram. By
switching the Red (240V) and the Orange (208V) at
the contactor terminal L2.
Capacitor
Transformer
CXM Control
Circ Brkr
Contactor -CC
Low Voltage
Connector
CB
HWG PB2
Loop PB1
L2 L1
Unit Power Supply
See electrical table for
wire and breaker size
External Pump
Power Supply
See electrical table for
wire and breaker size
T2 T1
Grnd
Install HWG Pump
Power after insuring
water is in HWG circuit
T2 T1
Yellow
Blk
Rev .: 09/20/01
L2
L3 L1
Capacitor
Transformer
CXM Control
Contactor -CC
Low Voltage
Connector
CB
Unit Power Supply
See electrical table for
wire and breaker size
Grnd
Rev .: 09/20/01
Figure 5b: GSW036-060 Series Line Voltage Field
Wiring Commercial Class
(3 phase shown)
Electrical - Line Voltage

IOM
17
climatemaster.com
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Genesis Water-to-Water (GSW) Series
Rev.: 16 Oct, 2008B
Figure 5c: GSW120 Series Line Voltage Field Wiring
Commercial Class
Rev .: 10/04/01 B
Contactor -CC1
Transformer
CXM Control #1
Low Voltage
Connector
Grnd
L2 L3L1
Low Voltage
Connector
Contactor -CC2
CXM Control #2
Power Distribution
Block
Unit Power Supply
See electrical table for breaker size.
3 phase shown. For 208/230/60/1
use only L1 and L2
Thermostat Connections
The aquastat/thermostat should be wired directly to the
CXM/DXM board as shown in Figure 6a for GSW036-060
and Figure 6b for the GSW120. Note the GSW second
stage is wired directly to the CXM #2.
Figure 6a. GSW036-060 Low Voltage Field Wiring
(CXM shown)
Electrical - Low Voltage
Capacitor
Transformer
CXM Control
Circ Brkr
Contactor -CC
Low Voltage
Connector
CB
HWG PB2
Loop PB1
L2 L1
Grnd
Rev.: 09/20/01B
Low Voltage
Wiring
5HY%
&RQWDFWRU&&
7UDQVIRUPHU
Low Voltage
Connector
*UQG
/ //
Low Voltage
Connector
&RQWDFWRU&&
&;0&RQWURO
3RZHU'LVWULEXWLRQ
%ORFN
Low Voltage
Wiring
&;0&RQWURO
Second Stage Call
(Not needed on DXM Models all
low voltage wires to DXM #1)
Figure 6b: GSW120 Low Voltage Field Wiring (CXM
shown)
Electrical - Line Voltage

ClimateMaster Water-Source Heating and Cooling Systems
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Genesis Water-to-Water (GSW) Series
Rev.: 16 Oct, 2008B
IOM
18
Accessory Connections
A terminal paralleling the compressor contactor coil has
been provided on the CXM/DXM control of the GSW line.
"A" has been provided to control accessory devices, such
as water valves, electronic air cleaners, humidifiers, etc.
Note: This terminal should be used only with 24 Volt
signals and not line voltage signals. This signal oper-
ates with the compressor contactor. See Figure 8 or the
wiring schematic for details.
Figure 8: Accessory Wiring
Figure 9: Well Water AVM Valve Wiring
Water Solenoid Valves
When using external solenoid valves on ground water
installations. Figure 14 illustrates a typical slow closing
water control valve wiring which will limit wasted water
during a lockout condition. A slow closing valve may be
Low Water Temperature Cutout - FP1
The CXM/DXM control allows the field selection of source
fluid low temperature cutout points. The factory setting
of FP1 is set for water (30°F). In cold temperature ap-
plications jumper JW3 (FP1- antifreeze 10°F) should be
clipped as shown in Figure 7 to change the setting to
10°F, a more suitable temperature when using antifreezes.
It should be noted that the extended range option should
be specified to operate the GSW Series at entering water
temperatures below 60°F.
Figure 7: Changing FP1-Low Water Temperature
Cutout Setpoint
JW3-FP1 jumper
should be clipped
when antifreeze
is used.
C
C
Thermostat
Y1
1
2
3
Y1
AVM
Taco Valve
Heater Switch
Electrical - Low Voltage
CXM Board
required to prevent water hammer. When using an AVM
-Taco Slow Closing valves on GSW Series equipment
Figure 9 wiring should be utilized. The valve takes approxi-
mately 60 seconds to open (very little water will flow before
45 seconds) and it activates the compressor only after the
valve is completely opened (by closing its end switch). Only
relay or triac based electronic thermostats should be used
with the AVM valve. When wired as shown, the valve will
operate properly with the following notations:
1. The valve will remain open during a unit lockout.
2. The valve will draw approximately 25-35 VA through the
“Y” signal of the thermostat. Note: This can overheat
the anticipators of electromechanical thermostats.
Therefore only relay or triac based thermostats should
be used.
 CAUTION! 
CAUTION! Many units installed with a factory or field supplied
manual or electric shut-off valve. DAMAGE WILL OCCUR if
shut-off valve is closed during unit operation. A high pressure
switch must be installed on the heat pump side of any field
provided shut-off valves and connected to the heat pump
controls in series with the built-in refrigerant circuit high
pressure switch to disable compressor operation if water
pressure exceeds pressure switch setting. The field installed
high pressure switch shall have a cut-out pressure of 300
psig and a cut-in pressure of 250 psig. This pressure switch
can be ordered from ClimateMaster with a 1/4” internal flare
connection as part number 39B0005N02.

IOM
19
climatemaster.com
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Genesis Water-to-Water (GSW) Series
Rev.: 16 Oct, 2008B
GSW036-060 Wiring Diagram
CXM 208/230/60/1 Distributor Class

ClimateMaster Water-Source Heating and Cooling Systems
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Genesis Water-to-Water (GSW) Series
Rev.: 16 Oct, 2008B
IOM
20
GSW036-060 Wiring Diagram
CXM 208-230/60/1, & 265/60/1 Commercial Class - 96B0048N01