ClimateMaster GLW Series Guide

Genesis Series
GLW360
Large Water to Water
Heat Pump
Installation, Operation &
Maintenance Instructions
97B0029N01
Revision: 05/19/05
GLW Series
Table of Contents
Model Nomenclature 2
Storage 3
Pre-Installation 3
Physical Data 3
GLW360 Physical Dimensions 4
Unit Installation 5
Piping Installation 5
Load Side Plumbing 6
Commercial Water Loop Applications 7
Open Loop Applications 8
Ground Loop Applications 10
Electrical Data 11
Power Wiring 11
Low Voltage Field Wiring 11
Low Water Temperature Cutout Selection 12
Water Valve Wiring 12
CXM/DXM & Other Control References 12
Electrical Wiring Schematics 13-16
Unit Starting and Operating Conditions 17
Piping System Cleaning & Flushing Procedures 17
Unit and System Checkout Procedure 18
Unit Start-Up Procedure 19
Coax Pressure Drop Table 19
CXM/DXM Safety Control Reset 19
Preventive Maintenance 20
Warranty 23

Page 2 Genesis Large Water-to-Water (GLW) Series
MODEL NOMENCLATURE
G L W B3 6 0 DF 2 A B R B S
1 2 3 4 5 6 7
8
9101112131415
GL = Large Commercial W/Scroll
Model Type
W = Water To Water
Configuration
Unit Size
360
Revision Level
B = Current
Voltage
Controls
2 = Extended Range W/Ultra Quiet
Cabinet Insulation
Options
B = Brazed Plate Hx W/Stainless Steel Plates
Source Water Coil Options
B = Brazed Plate Hx W/Stainless Steel Plates
Load Water Coil Options
S = Standard
1 = Extended Range
B = Disconnect Switch
A = Standard
R = Right
Water Connection Location
C = CXM
D = DXM
L = CXM w/LON
M = DXM w/LON
F = 460/60/3
H = 208-230/60/3
N = 575/60/3
N = CXM w/MPC
P = DXM w/MPC
Rev.: 05/19/05D

Genesis Large Water-to-Water (GLW) Series Page 3
GENERAL INFORMATION
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 original packaging in
a clean, dry area. Store units in an upright position at all
times. Stack units a maximum of 2 units high.
Unit Protection
Cover units on the job site with either shipping packaging,
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
packaging until installation is complete and all
plastering, painting, etc. is finished.
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!
!
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.
GLW Physical Data
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.
▲WARNING!
!
Model 360
Compressor/qty Scroll/2
Factory Charge R22: each circuit - (lbs.) [kg 9 [4.1
Indoor/Load Water Connection Size
FPT - All Other 2"
Outdoor/Source Water Connection Size
FPT - All Other 2"
Weight - Operating - lbs. [kg 955 [434
Weight - Packaged - lbs. [kg 1005 [457
Grommet mounted compressor.
Rev.: 8/26/02B
Dedicated heating and cooling expansion valves with filter drier.
Insulated Indoor and Outdoor brazed plate heat exchangers.
Check serial plate for refrigerant type.
Insulated refrigerant and water piping.

Page 4 Genesis Large Water-to-Water (GLW) Series
GLW360 DIMENSIONS
3.1
[78
8.4
[214
16.0
[406
34.4
[873
39.4
[1003
2.9
[74
5.4
[138
35.4
[900
42.8
[1088
Recommended
Service Access
30" [762
All Dimensions in inches [mm
47.3
[1202
28.1
[713
Source Water Out
2" FPT [50.8
39.7
[1008
Load Water In
2" FPT [50.8
Source Water In
2" FPT [50.8
Load Water Out
2" FPT [50.8
Low Voltage
1/2" [12.7
Conduit
Line Voltage
1-1/4"
[31.8
Conduit
Recommended
Service Access
30" [762
Rev.: 08/26/02B
Front View Left Side View
Recommended
Service Access
30" [762
Optional
Disconnect
Switch

Genesis Large Water-to-Water (GLW) Series Page 5
▲CAUTION
!
Corrosive system water requires corrosion resistant
fittings and hoses and possibly water treatment.
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.
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. 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
and causes a slight kink.
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
temperature. 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
Figure 1: Supply/Return Hose Kit
PIPING INSTALLATION
▲CAUTION
!
Piping must comply with all applicable codes.
flared-end connections are used. If pipe joint compound
is preferred, use compound only in small amounts on the
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 ft-lbs
[41 N-m]. If a torque wrench is not available, tighten
finger-tight plus one quarter turn. Tighten steel fittings
as necessary.
Do not bend or kink supply lines or hoses.
▲WARNING!
!
GLW 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.
UNIT 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
[4-38°C] and up to 75% relative humidity.
▲WARNING
!
Load and source piping must include a 20 mesh
[0.84mm] filter to control suspended particles
flowing through the unit's plate heat exchangers.
ClimateMaster provides a 20 mesh (841 micron)
strainer in the commercial price list that is a
REQUIRED option for all GLW units regardless
of application type.
Rib Crimped
Length
(2 ft [0.6m Length Standard)
Swivel
Brass
Fitting
Brass
Fitting
EPT

Page 6 Genesis Large Water-to-Water (GLW) Series
GLW Unit Load Plumbing
The applications are too varied to describe in this document.
However, some basic guidelines will be presented. Much of
the discussions on water loop applications would be valid for
the load plumbing discussion as well. All plumbing should
conform to local codes with the following considerations:
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.
- EMPLOY A 20 MESH (841 MICRON) [0.84MM]
PARTICULATE STRAINER IN BOTH LOAD AND
SOURCE PLUMBING TO PROTECT THE PLATE
HEAT EXCHANGERS.
LOAD PLUMBING INSTALLATION
- Insure that load water flow in high temperature heating
applications is at least 3 gpm per ton [3.9 l/m per kW]
to improve performance and reduce nuisance high
pressure faults.
- DO NOT employ plastic to metal threaded joints
- Utilize a pressure tank and air separator vent system to
equalize pressure and remove air..
Swimming Pool Hot Tub Applications:
- Load coax should be isolated with secondary heat
exchanger constructed of anti-corrosion material in all
chlorine/bromine fluid applications.

Genesis Large Water-to-Water (GLW) Series Page 7
COMMERCIAL WATER LOOP 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 [10°C],
1/2" [13mm] closed cell insulation is required on all
piping surfaces to eliminate condensation. Metal to plastic
threaded joints should never be employed due to their
tendency to leak over time. 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 GLW Series and the piping system .
For satisfactory operation of GLW360, it is essential to
control the suspended solid particles in water to below 20
mesh (841 micron) [0.84mm] size. It is mandatory that
minimum 20 mesh (841 micron) [0.84mm] strainer be used.
Installation with a high concentration of solid particles
over 20 mesh (841 micron) [0.84mm] size should consider
using filters with adequate and scheduled maintenance. The
hose kits include shut off valves, P/T plugs for performance
measurement, high pressure stainless steel braid hose,
"Y" type strainer 20 mesh (841 micron) [0.84mm])
with blowdown valve, and "J" type swivel connection.
Figure 2: Typical Water Loop Application.
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. The piping system should be flushed to
remove dirt, piping chips, and other foreign material prior
to operation. See page 17 for Piping System Cleaning and
Flushing Procedures. The flow rate is usually set between
2.25 gpm and 3 gpm per ton [2.9 l/m and 4.5 l/m per kW]
of cooling capacity. ClimateMaster recommends 2.5 gpm
per ton [3.2 l/m per kW] 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 [16-32°C]. 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
15°F [-9.4°C]) setpoint to avoid nuisance faults. See Low
Water Temperature Cutout - FP1 on page 12.
Air Pad or
Extruded
polystyrene
insulation board
Concrete
block or
brick
Unit Power
Disconnect
Thermostat
Wiring
Optional
Balancing
Valve
Y-Strainer 20 mesh (841 micron [0.84mm])
with blow-off valve
REQUIRED
Water In
Water Out
Optional Low Pressure Drop
Water Control Valve
(See Figure 3)
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
Out
Load
Plumbing
In
Caution:
See Figure 3 if motorized valve is used.

Page 8 Genesis Large Water-to-Water (GLW) Series
Shut off valves should be included in case of servicing.
Boiler drains or other valves should be ʻteeʼdʼinto the line
to allow acid flushing of just the heat exchanger. Pres-
sure temperature plugs should be used so that flow and
temperature can be measured. Piping materials should be
limited to PVC SCH80 or copper. Due to the pressure
and temperature extremes, PVC SCH40 is not recom-
mended. Water quantity should be plentiful and of good
quality. Consult Table 2 for water quality guidelines.
For satisfactory operation of GLW360, it is essential to
control the suspended solid particles in water to below
20 mesh (841 micron) [0.84mm] size. It is mandatory
that minimum 20 mesh (841 micron) [0.84mm] strainer
be used. Installation with a high concentration of solid
OPEN LOOP - GROUND WATER SYSTEMS
particles over 841 micron [0.84mm] size should consider
using filters with adequate and scheduled maintenance.
The hose kits include shut off valves, P/T plugs for per-
formance measurement, and "Y" type strainer 20 mesh
(841 micron) [0.84mm] with blowdown valve.
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
exchangers 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.
Table 2: Water Quality Standards
Water Quality
Parameter
HX
Material
Closed
Recirculating Open Loop and Recirculating Well
Scaling Potential - Primary Measurement
pH/Calcium Hardness All - pH < 7.5 and Ca Hardness <100ppm
Method
Index imits for Probable Scaling Situations - (Operation outside these limits is not recommended)
Ryznar All - 6.0 - 7.5
Stability Index If >7 5 minimize steel pipe use
Langelier All - -0.5 to +0.5
Saturation Index If <-0 5 minimize steel pipe use Based upon 150 ¡F HWG and Direct
well, 85¡F Indirect Well HX
Iron Fouling
Iron Fe 2+ (Ferrous) All - <0.2 ppm (Ferrous)
(Bacterial Iron potential) If Fe2+ (ferrous)>0 2 ppm with pH 6 - 8, O2<5 ppm check for iron bacteria
Iron Fouling All - <0.5 ppm of Oxygen
Above this level deposition will occur
Corrosion Prevention
pH All 6 - 8.5 6 - 8.5
Monitor/treat as
needed Minimize steel pipe below 7 and no open tanks with pH <8
Hydrogen Sulfide (H2S) All - <0.5 ppm
At H2S>0 2 ppm, avoid use of copper and copper nickel piping or HX's
Rotten egg smell appears at 0 5 ppm level
Copper alloy (bronze or brass) cast components are OK to <0 5 ppm
Ammonia ion All - <0.5 ppm
as hydroxide, chloride,
nitrate and sulfate
compounds
Maximum Maximum Allowable at maximum water temperature
Chloride Levels 50¡F (10¡C) 75¡F (24¡C) 100°F (38°C)
Copper -<20ppm NR NR
CuproNickel -<150 ppm NR NR
304 SS -<400 ppm <250 ppm <150 ppm
316 SS -<1000 ppm <550 ppm < 375 ppm
Titanium ->1000 ppm >550 ppm >375 ppm
Erosion and Clogging
Particulate Size and
Erosion All
<10 ppm of particles
and a maximum
velocity of 6 fps
Filtered for maximum
800 micron size
<10 ppm (<1 ppm "sandfree" for reinjection) of particlesand a maximum
velocity of 6 fps Filtered for maximum 800 micron size Any particulate
that is not removed can potentially clog components
Notes: Rev.: 04/04/04
NR - Application not recommended
"-" No design Maximum
Closed Recirculating system is identified by a closed pressurized piping system. Recirculating open wells should observe the open recirculating design considerations.
Above the given limits, scaling is likely to occur Scaling indexes should be calculated using the limits below
Scaling indexes should be calculated at 150¡F for direct use and HWG applications,
and at 90¡F for indirect HX use A monitoring plan should be implemented

Genesis Large Water-to-Water (GLW) Series Page 9
In areas with extremely hard water, the owner 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 us-
ing its drawdown capacity rating. 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 slow closing
valves are recommended 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 ʻVAʼdraw of the valve can be
supplied by the unit transformer. For instance, some slow
closing valves can draw up to 35VA. This can overload
smaller 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.
Flow Regulation
Flow regulation can be accomplished by two methods.
First, most 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 6. 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 [2.0 to 2.6 l/m per kW] 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.
Freeze Protection Thermistor
For all open loop systems the 35°F [1.7 °C] FP1 setting
(factory setting-water) should be used to avoid freeze
damage to the unit. See "Low Water Temperature Cutout
- FP1" (Page 12).
▲WARNING
!
Load and source piping must include a 20 mesh
[0.84mm] filter to control suspended particles
flowing through the unit's plate heat exchangers.
ClimateMaster provides a 20 mesh (841 micron)
strainer in the commercial price list that is a
REQUIRED option for all GLW units regardless
of application type.
▲CAUTION
!
Freeze protection system will not allow leaving
load water temperature (cooling mode) or leaving
source water temperature (heating mode) to be
below 42 ° F [5.6 ° C].
Figure 3: Field Wiring of Motorized Valve
▲WARNING
!
Never jumper terminal "A" from CXM or DXM
board #1 to CXM or DXM board #2. See Figure 3
for motorized valve wiring.

Page 10 Genesis Large Water-to-Water (GLW) Series
GROUND LOOP APPLICATIONS
Pre-Installation
Prior to installation, locate and mark all existing
underground utilities, piping, etc. Install loops for new
construction before sidewalks, patios, driveways, and other
construction has begun. During construction, accurately
mark all ground loop piping on the plot plan as an aid in
avoiding potential future damage to the installation.
Piping Installation
All earth loop piping materials should be limited to only
polyethylene fusion for 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 to 110°F [-4
to 43°C], and 2.25 to 3 gpm of flow per ton [2.9 l/m to
3.9 l/m per kW] 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 [689 kPa].
Flushing the Earth Loop
Upon completion of system installation and testing, flush
the system to remove all foreign objects and purge to
remove all air.
Table 3. Antifreeze Percentages by Volume
Type Minimum Temperature for Freeze Protection
10°F [-12.2°C] 15°F [-9.4°C] 20°F [-6.7°C] 25°F [-3.9°C]
Methanol 25% 21% 16% 10%
100% USP food grade Propylene Glycol 38% 30% 22% 15%
Table 3: Antifreeze Percentages by Volume
▲CAUTION
!
The following instructions represent industry accepted
installation practices for Closed Loop Earth Coupled Heat
Pump Systems. They are provided to assist the contractor
in installing trouble free ground loops. These instructions
are recommended only. State and Local Codes MUST
be followed and installation MUST conform to ALL
applicable Codes. It is the responsibility of the Installing
contractor to determine and comply with ALL applicable
Codes and Regulations.
Antifreeze
In areas where minimum entering loop temperatures drop
below 40°F [5°C] or where piping will be routed through
areas subject to freezing, anti-freeze is needed. Alcohols
and glycols are commonly used as antifreezes, however
your local sales manager should be consulted for the an-
tifreeze best suited to your area. Freeze protection should
be maintained to 15°F [9°C] below the lowest expected
entering loop temperature. For example, if 30°F [-1°C]
is the minimum expected entering loop temperature, the
leaving loop temperature would be 25 to 22°F [-4 to -6°C]
and freeze protection should be at 15°F [-10°C] e.g. 30°F
- 15°F = 15°F [-1°C - 9°C = -10°C]. 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. Then use the percentage by volume
shown in Table 3 for the amount of antifreeze. Antifreeze
concentration should be checked from a well mixed
sample using a hydrometer to measure specific gravity.
Freeze Protection Setting
CXM or DXM Control:
When an antifreeze is selected, the FP1 jumper [JW3]
should be clipped to select the low temperature (Anti-
freeze 15°F [-9.4 °C]) setpoint to avoid nuisance faults.
▲WARNING
!
Load and source piping must include a 20 mesh
[0.84mm] filter to control suspended particles
flowing through the unit's plate heat exchangers.
ClimateMaster provides a 20 mesh (841 micron)
strainer in the commercial price list that is a
REQUIRED option for all GLW units regardless
of application type.

Genesis Large Water-to-Water (GLW) Series Page 11
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.
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.
Use only copper conductors for field installed
electrical wiring. Unit terminals are not designed
to accept other types of conductors.
ELECTRICAL - LINE VOLTAGE
Table 4: GLW Electrical Data
▲CAUTION
!
▲WARNING!
!
Rated Voltage Total Min Max
Model Voltage Min/Max Unit Circ Fuse/
RLA LRA Qty FLA Amp HACR
208-230/60/3 187/254 41.0 350.0 2.0 82.0 92.3 125
GLW 60 460/60/3 414/506 21.8 158.0 2.0 43.6 49.0 70
575/60/3 518/633 17.3 125.0 2.0 34.6 38.9 50
380-420/50/3 342/462 21.8 167.0 2.0 43.6 49.0 70
HACR circuit breaker in USA only Rev.: 07/23/02 B
Compressor
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.
GLW Power Connection
Line voltage connection is made by connecting the
incoming line voltage wires to L1, L2, and L3 on power
distribution block. Consult Table 4 for correct fuse size.
208 Volt Operation
All 208-230 Volt units are factory wired for 208 Volt.
The transformers may be switched to 230V operation as
illustrated on the wiring diagram by switching the Red
(208V) and the Orange (230V) at the contactor terminal L2.
▲CAUTION
!
Use only copper conductors for field installed
electrical wiring. Unit terminals are not designed
to accept other types of conductors.
Disconnect electrical power source to prevent
injury or death from electrical shock.
▲WARNING!
!

Page 12 Genesis Large Water-to-Water (GLW) Series
CXM/DXM, LonWorks, or MPC Control Operation
Note: See CXM/DXM AOM (part #97B0003N08), Lon Controller AOM (part #97B0013N01) or MPC Controller
AOM (part #97B0031N01) on the web at www.climatemaster.com
Comp
Relay
R
C
CC
CCG
BR BRG
Test
Off On
FP1
FP2
JW3
JW2
Accessory Connections
A terminal paralleling the compressor contactor coil has
been provided on the CXM/DXM control of the GLW
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
operates with the compressor contactor.
Figure 4: Changing FP1-Low Water Temperature
Cutout Setpoint
CXM PCB
JW3-FP1 jumper
should be clipped
when antifreeze is
used.
Thermostat Connections
The aquastat/thermostat should be wired directly to the
CXM/DXM board #1 . Note: The GLW second stage is
wired directly to the CXM #2.
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 (35°F [1.7°C]). In cold
temperature applications jumper JW3 (FP1- antifreeze
15°F [-9.4°C]) should be clipped as shown in Figure 4
to change the setting to 10°F [-12.2°C], a more suitable
temperature when using antifreezes.
ELECTRICAL - LOW VOLTAGE
▲WARNING
!
Never jumper terminal "A" from CXM or DXM
board #1 to CXM or DXM board #2. See Figure 3
for motorized valve wiring.

Genesis Large Water-to-Water (GLW) Series Page 13
TYPICAL WIRING DIAGRAM - GLW W/CXM

Page 14 Genesis Large Water-to-Water (GLW) Series
TYPICAL WIRING DIAGRAM - GLW W/DXM

Genesis Large Water-to-Water (GLW) Series Page 15
TYPICAL WIRING DIAGRAM - GLW W/LON

Page 16 Genesis Large Water-to-Water (GLW) Series
TYPICAL WIRING DIAGRAM - GLW W/MPC

Genesis Large Water-to-Water (GLW) Series Page 17
Cleaning and flushing of the WLHP piping system is the
single most important step to ensure proper start-up and
continued efficient operation of the system.
Follow the instructions below to properly clean and flush
the system:
1. Verify electrical power to the unit is disconnected.
2. Install the system with the supply hose connected
directly to the return riser valve. Use a single length of
flexible hose.
3. Open all air vents. Fill the system with the water. DO
NOT allow system to overflow. Bleed all air from the
system. Pressurize and check the system for leaks and
repair appropriately.
4. Verify all strainers are in place. Start the pumps, and
systematically check each vent to ensure all air is bled
from the system.
5. Verify make-up water is available. Adjust make-up
water appropriately to replace the air which was bled
from the system. Check and adjust the water/air level
in the expansion tank.
6. Set the boiler to raise the loop temperature to approxi-
mately 85°F [29°C]. Open the a drain at the lowest
point in the system. Adjust the make-up water replace-
ment rate to equal the rate of bleed.
7. Refill the system and add trisodium phosphate in a
proportion of approximately one pound per 150 gal-
lons [1/2 kg per 750 L] of water (or other equivalent
UNIT STARTING AND OPERATING CONDITIONS
Operating Limits
Environment – This unit is designed for indoor
installation only.
Power Supply – A voltage variation of +/– 10% of
nameplate utilization voltage is acceptable.
Starting Conditions
GLW Units – Units start and operate in an ambient of
45°F [7°C] with entering water at 30°F [-1.1°C] and water
at the stated flow rates of 3 gpm per ton [3.9 l/m per kW]
for initial winter start-up.
Notes:
1. These are not normal or continuous operating
conditions. It is assumed that winter start-up is to bring
the building space up to occupancy temperatures.
2. Voltage utilization range complies with ARI
Standard 110.
Determination of operating limits is dependent primarily
upon three factors: 1) entering load temperature. 2)
entering source temperature and 3) ambient temperature.
When any one of these factors is at minimum or
maximum levels, the other two factors should be at
normal levels to ensure proper unit operation.
Extreme variations in temperature and humidity and
corrosive water will adversely affect unit performance,
reliability, and service life.
PIPING SYSTEM CLEANING AND FLUSHING
approved cleaning agent). Reset the boiler to raise the
loop temperature to about 100°F [38°C]. Circulate the
solution for a minimum of 8 to 24 hours. At the end of
this period, shut off the circulating pump and drain the
solution. Repeat system cleaning if desired.
8. When the cleaning process is complete, remove the
short-circuited hoses. Reconnect the hoses to the
proper supply, and return the connections to each of
the units. Refill the system and bleed off all air.
9. Test the system pH with litmus paper. The system
water should be slightly alkaline (pH 7.5-8.5). Add
chemicals, as appropriate, to maintain acidity levels.
10. When the system is successfully cleaned, flushed,
refilled and bled, check the main system panels, safety
cutouts and alarms. Set the controls to properly main-
tain loop temperatures.
▲CAUTION
!
To avoid possible damage to a plastic (PVC) piping sys-
tem, do not allow temperatures to exceed 110°F [43°C].
▲CAUTION
!
DO NOT use 'stop leak' or any similar chemical
agent in this system. Addition of these chemicals
to the loop water will foul the system and inhibit
unit operation.
Table 5: Operating Limits
Source Side
Water Limits
Min. Entering Liquid
Normal Entering Water
Max Entering Water
Load Side
Water Limits
Min. Entering Water
Normal Entering Water
Max Entering Water
Cooling
50°F [10 °C]
85°F [29 °C]
110°F [43 °C]
50°F [10 °C]
60°F [15 °C]
90°F [32 °C]
Heating
20°F [-7 °C]
60°F [15 °C]
70°F [21 °C]
60°F [15 °C]
100°F [38 °C]
120°F [49 °C]

Page 18 Genesis Large Water-to-Water (GLW) Series
UNIT CHECKOUT
q Balancing/Shutoff Valves: Ensure all
isolation valves are open, water control valves
wired and open or coax may freeze and burst.
BEFORE POWERING SYSTEM, please check the following:
UNIT AND SYSTEM CHECKOUT
SYSTEM CHECKOUT
q System Water Temperature: Check load
and source water temperature for proper range
and also verify heating and cooling setpoints for
proper operation.
q System pH: System water pH is 6 - 8.5. Proper
pH promotes longevity of hoses and fittings.
q System Flushing: Verify all hoses are
connected end to end when flushing to ensure
debris bypasses unit heat exchanger and water
valves etc. Water used in the system must be
potable quality initially and clean of dirt, piping
slag, and strong chemical cleaning agents. Verify
all air is purged from the system. Air in the system
can cause poor operation or system corrosion.
q Cooling Tower/Boiler: Check equipment
for proper setpoints and operation.
q Standby Pumps: Verify the standby pump is
properly installed and in operating condition.
q System Controls: Verify system controls
function and operate in the proper sequence.
q Low Water Temperature Cutout:
Verify low water temperature cut-out controls are
provided for the outdoor portion of the loop or
operating problems will occur.
q System Control Center: Verify control
center and alarm panel for proper setpoints
and operation.
q Strainers: Verify 20 mesh (841 micron)
[0.84mm] strainers are installed in load and
source water piping. Confirm maintenance
schedule for strainers.
q Miscellaneous: Note any questionable
aspects of the installation.
To avoid equipment damage, DO NOT leave
system filled in a building without heat during the
winter unless antifreeze is added to system water.
Condenser coils never fully drain by themselves
and will freeze unless winterized with antifreeze.
Verify ALL water controls are open and allow wa-
ter flow prior to engaging the compressor. Freez-
ing of the coax or water lines can permanently
damage the heat pump.
q Line Voltage and Wiring: Ensure Voltage
is within an acceptable range for the unit and
wiring and fuses/breakers are properly sized.
Low voltage wiring is complete.
q Unit Control Transformer:Ensure
transformer has properly selected control voltage
tap. 208-230V units are factory wired for 208V
operation unless specified otherwise.
q Entering Water:Ensure entering water
temperatures are within operating limits of Table 6.
q Low Water Temperature Cutout:
Verify low water temperature cut-out on CXM/
DXM is properly set.
q Water Flow Balancing: Verify inlet and
outlet water temperatures on both Load and
source are recorded for each heat pump upon
startup. This check can eliminate nuisance trip
outs and high velocity water flows that can erode
heat exchangers.
q Unit Controls: Verify CXM or DXM field
selection options are proper and complete.
▲WARNING!
!
▲WARNING!
!

Genesis Large Water-to-Water (GLW) Series Page 19
Table 7: Water Temperature Change Through
Source Heat Exchanger
Table 6: Coax Water Pressure Drop
CXM/DXM Safety Control Reset
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 (35°F [1.7°C]). In cold temperature
applications jumper JW3 (FP1- antifreeze 15°F [-9.4°C])
should be clipped as shown in Figure 4 to change the
setting to 10°F [-12.2°C], a more suitable temperature
when using antifreezes.
Lockout - In Lockout mode, the Status LED will begin
fast flashing. The compressor relay is turned off immedi-
ately. Lockout mode can be soft reset via the thermostat
“Y” input or can be hard reset via the disconnect. The last
fault causing the lockout will be stored in memory and
can be viewed by going into test mode.
Fault Retry - In Fault Retry mode, the Status LED begins
slow flashing to signal that the control is trying to recover
from a fault input. The CXM control will stage off the
outputs and then “try again” to satisfy the thermostat "Y"
input call. Once the thermostat input calls are satisfied, the
control will continue on as if no fault occurred. If 3 con-
secutive faults occur without satisfying the thermostat "Y"
input call, then the control will go to Lockout mode. The
last fault causing the lockout will be stored in memory
and can be viewed by going into test mode.
Consult the CXM/DXM AOM for complete descriptions.
Note: Units have a five minute time delay in the control
circuit that can be eliminated on the CXM PCB as
shown in Figure 5. See controls description for detailed
features of the control.
Short test pins together
to enter Test Mode and
speed-up timing and
delays for 20 minutes.
Figure 5: Test Mode Pins
CXM Board
C
o
R
e
R
C
CC
CCG
BR BRG
Test
Off On
FP1
FP2
JW3
JW2
UNIT START UP PROCEDURE
Verify ALL water controls are open and allow wa-
ter flow prior to engaging the compressor. Freez-
ing of the coax or water lines can permanently
damage the heat pump.
▲WARNING!
!
When the disconnect switch is closed, high
voltage is present in some areas of the electri-
cal panel. Exercise caution when working with
energized equipment.
1. Adjust all valves to their full open position. Turn on
the line power to all heat pump units.
2. Operate each unit in the cooling cycle. Loop water
temperature entering the heat pumps should be be-
tween 70°F [21°C] and 110° F [43°C].
3. Operate each heat pump in the heating cycle immedi-
ately after checking cooling cycle operation. A time
delay will prevent the compressor from re-starting for
approximately five (5) minutes.
4. Establish a permanent operating record by logging
the unit operating conditions at initial start-up for
each unit.
5. If a unit fails to operate, conduct the following checks:
a. Check the voltage and current. They should comply
with the electrical specifications described on the
unit nameplate.
b. Look for wiring errors. Check for loose terminal
screws where wire connections have been made on
both the line and low-voltage terminal boards.
Use the procedure outlined below to initiate proper unit start-up:
c. Check the supply and return piping. They must be
properly connected to the inlet and outlet connections
on the unit.
d. If the checks described above fail to reveal the
problem and the unit still will not operate, contact a
trained service technician to ensure proper diagnosis
and repair of the equipment.
Source/Outdoor Coax
Model GPM Pressure Drop (psi)
30°F50°F70°F90°F
45.0 2.6 2.4 2.4 2.3
360 67.5 5.6 5.1 5.1 4.8
90.0 9.5 8.7 8.7 8.2
Water Flow, gpm (l/m) Rise, Cooling Drop, Heating
¡ F ( ¡ C)
For Closed Loop: Ground Source or Closed Loop
Systems at 3 gpm per ton (3 9 l/m per kw) 9 - 12
(5 - 6 7)
4 - 8
(2 2 - 4 4)
For Open Loop: Ground Water Systems at
1 5 gpm per ton (2 0 l/m per kw) 20 - 26
(11 1 - 14 4)
10 - 17
(5 6 - 9 4)
¡ F ( ¡ C)

Page 20 Genesis Large Water-to-Water (GLW) Series
Water Plate Heat Exchanger Maintenance –
(Direct Ground Water Applications Only)
If the installation is performed in an area with a known
high mineral content (125 P.P.M. or greater) in the
water, it is best to establish with the owner a periodic
maintenance schedule so the coil can be checked
regularly. Consult the well water applications section
of this manual for a more detailed water coil material
selection. Should periodic coil cleaning be necessary, use
standard coil cleaning procedures which are compatible
with either the heat exchanger material or copper water
lines. Generally, the more water flowing through the unit
the less chance for scaling therefore 1.5 gpm per ton [2.0
l/m per kW] is recommended as a minimum flow.
Clean or replace 20 mesh (841 micron) [0.84mm]
strainer/filters on a timely schedule.
Water Plate Heat Exchanger Maintenance –
(All Other Water Loop Applications)
Generally water coil maintenance is not needed however,
if the installation is located in a system with a known
high dirt or debris content, it is best to establish with
the owner a periodic maintenance schedule so the coil
can be checked regularly. These dirty installations are a
result of the deterioration of iron or galvanized piping
or components in the system or open cooling towers
requiring heavy chemical treatment and mineral buildup
through water use. Should periodic coil cleaning be
necessary, use standard coil cleaning procedures which
are compatible with both the heat exchanger material and
copper water lines. Generally, the more water flowing
through the unit, the less chance for scaling, however flow
rates over 3 gpm per ton [3.9 l/m per kW] can produce
water (or debris) velocities that can erode the heat
exchanger wall and ultimately produce leaks.
Clean or replace 20 mesh (841 micron) [0.84mm]
strainer/filters on a timely schedule.
Compressors -
Conduct annual amperage checks to ensure amp draw is
no more than 10% greater than that indicated by serial
plate data.
Cabinet -
Do not allow water to stay in contact with the cabinet for
long periods of time to prevent corrosion of the cabinet
sheet metal. Generally vertical cabinets are set up from
the floor a few inches for prevention. The cabinet can be
cleaned using a mild detergent.
Refrigerant System -
To maintain sealed circuit integrity, do not install service
gauges unless unit operation appears abnormal. Reference
the operating chart for pressure and temperatures. Verify
that air and water flow rates are at proper levels before
servicing the refrigerant circuit.
PREVENTIVE MAINTENANCE