ClimateMaster Tranquility 30 Series Guide

Tranquility® 30 (TT) Series
Tranquility® 20 (TS) Series
Residential Horizontal & Vertical
Packaged Geothermal Heat Pumps
Installation, Operation &
Maintenance Instructions
97B0113N01
Rev.:January 30, 2017
H&V Products
Table of Contents
Model Nomenclature 3
Storage 4
Pre-Installation 4
Horizontal Installation 5-6
Horizontal Service Access 7
Field Conversion of Air Discharge 8
Duct System Installation 9
Condensate Piping Installation 9
Vertical Installation Clearances 10
Vertical Installation 11-12
Water Connection Installation 13
Ground Loop Applications 13-14
Open Loop - Ground Water Systems 15-16
Water Quality Standards 17
Hot Water Generator 18-20
Electrical - Line Voltage 21-22
Electrical - Low Voltage Wiring 23
Accessory Connections 24
Electrical - Thermostat Wiring 25
ECM Blower Control 26-27
Blower Data 28-30
CXM Controls 31
Safety Features – CXM Control 32-34
Unit Commissioning
And Operating Conditions 35
Unit Start-Up and Operating Conditions 36
Unit Start-Up Procedure 37
Coax Pressure Drop Tables 38
Unit Operating Conditions 39-43
Performance Data 44-63
Preventive Maintenance 64
Troubleshooting 65
CXM Process Flow Chart 66
Functional & Performance Troubleshooting 67-68
Troubleshooting Form 69
Refrigerant Circuit Diagram 69
Warranty 70
Revision History 72

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3
Residential H&V - 60Hz HFC-410A
Rev:January 30, 2017
climatemaster.com
Model Nomenclature:General Overview
ѥWARNING! ѥ
ѥWARNING! ѥ
ѥCAUTION! ѥ
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 pro¿ciency requirements.
CAUTION! To avoid equipment damage, DO NOT use
these units as a source of heating or cooling during the
construction process. The mechanical components and
¿lters will quickly become clogged with construction dirt and
debris, which may cause system damage.
WARNING! 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, refrigerant circuit
oil will remain in the compressor. To avoid leakage of
compressor oil, refrigerant lines of the compressor must be
sealed after it is removed.
Safety
Warnings, cautions and notices appear throughout this
manual. Read these items carefully before attempting any
installation, service, or troubleshooting of the equipment.
DANGER: Indicates an immediate hazardous situation, which
if not avoided will result in death or serious injury. DANGER
labels on unit access panels must be observed.
WARNING: Indicates a potentially hazardous situation, which
if not avoided could result in death or serious injury.
CAUTION: Indicates a potentially hazardous situation or an
unsafe practice, which if not avoided could result in minor or
moderate injury or product or property damage.
NOTICE: Noti¿cation of installation, operation or maintenance
information, which is important, but which is not hazard-
related.
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ѥWARNING! ѥ
NOTE: Above model nomenclature is a general reference. Consult individual speciÀcation sections for detailed information.
WARNING! The EarthPure®Application and Service
Manual should be read and understood before attempting
to service refrigerant circuits with HFC-410A.

Residential H&V - 60Hz HFC-410A:
Rev:January 30, 2017
4Geothermal Heating and Cooling
General Information
CAUTION! 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
signi¿cantly reduce performance, reliability, and service life.
Always move and store units in an upright position. Tilting
units on their sides may cause equipment damage.
ѥCAUTION! ѥ
ѥCAUTION! ѥ
Pre Installation
CAUTION! CUT HAZARD - Failure to follow this caution
may result in personal injury. Sheet metal parts may have
sharp edges or burrs. Use care and wear appropriate
protective clothing, safety glasses and gloves when
handling parts and servicing heat pumps.
Inspection
Upon receipt of the equipment, carefully check the shipment
against the bill of lading. Make sure all units have been
received. Inspect the packaging of each unit, and inspect each
unit for damage. Insure that 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 ¿led
within 15 days, the freight company can deny the claim without
recourse. Note: It is the responsibility of the purchaser to ¿le
all necessary claims with the carrier. Notify your equipment
supplier of all damage within ¿fteen (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 3 units high.
Unit Protection
Cover units on the job site with either the original packaging
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, ¿ttings, and valves before installing any of
the system components. Remove any dirt or debris found in
or on these components.
Pre-Installation
Installation, Operation, and Maintenance instructions are
provided with each unit. Horizontal equipment is designed for
installation above false ceiling or in a ceiling plenum. Other
unit con¿gurations are typically installed in a mechanical
room. 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 original packaging until
installation is complete and all plastering, painting, etc. is
¿nished.
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. Remove any blower support packaging (water-to-air
units only).
6. Loosen compressor bolts on units equipped with
compressor grommet vibration isolation until the
compressor rides freely on the grommets.
7. Locate and verify any hot water generator (HWG), hanger,
or other accessory kit located in the compressor section
or blower section.

5
Residential H&V - 60Hz HFC-410A
Rev:January 30, 2017
climatemaster.com
Horizontal Installation
Mounting Horizontal Units
Horizontal units have hanger kits pre-installed from the
factory as shown in Figure 1. Figure 3 shows a typical
horizontal unit installation.
Horizontal heat pumps are typically suspended above a
ceiling or within a soffit using field supplied, threaded rods
sized to support the weight of the unit.
Use four (4) field supplied threaded rods and factory
provided vibration isolators to suspend the unit. Hang the
unit clear of the floor slab above and support the unit by the
mounting bracket assemblies only. DO NOT attach the unit
flush with the floor slab above.
Pitch the unit toward the drain as shown in Figure 2 to
improve the condensate drainage. On small units (less than
8.8kW) ensure that unit pitch does not cause condensate
leaks inside the cabinet.
Drain
Connection
1/4” (6.4mm) pitch
toward drain for drainag
e
Figure 1: Hanger Bracket
Figure 2: Horizontal Unit Pitch
Horizontal Unit Location
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
without removing unit from the ceiling. Horizontal units
are typically installed above a false ceiling or in a ceiling
plenum. Never install units in areas subject to freezing or
where humidity levels could cause cabinet condensation
(such as unconditioned spaces subject to 100% outside air).
Consideration should be given to access for easy removal of
the filter and access panels. Provide sufficient room to make
water, electrical, and duct connection(s).
If the unit is located in a confined space, such as a closet,
provisions must be made for return air to freely enter the
space by means of a louvered door, etc. Any access panel
screws that would be difficult to remove after the unit is
installed should be removed prior to setting the unit. Refer to
Figure 3 for an illustration of a typical installation. Refer to unit
specifications catalog for dimensional data.
Conform to the following guidelines when selecting
unit location:
1. Provide a hinged access door in concealed-spline or
plaster ceilings. Provide removable ceiling tiles in T-bar
or lay-in ceilings. Refer to horizontal unit dimensions for
specific series and model in unit specifications catalog.
Size the access opening to accommodate the service
technician during the removal or replacement of the
compressor and the removal or installation of the unit
itself.
2. Provide access to hanger brackets, water valves and
fittings. Provide screwdriver clearance to access panels,
discharge collars and all electrical connections.
3. DO NOT obstruct the space beneath the unit with piping,
electrical cables and other items that prohibit future
removal of components or the unit itself.
4. Use a manual portable jack/lift to lift and support the
weight of the unit during installation and servicing.
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.
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Residential H&V - 60Hz HFC-410A:
Rev:January 30, 2017
6Geothermal Heating and Cooling
Horizontal Installation
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Figure 3: Typical Horizontal Unit Installation
Air Coil - To obtain maximum performance, the air coil should
be cleaned before start-up. A10% solution of dishwasher
detergent and water is recommended for both sides of the coil.
A thorough water rinse should follow.

7
Residential H&V - 60Hz HFC-410A
Rev:January 30, 2017
climatemaster.com
Horizontal Service Access
Left Return Back Discharge Right Return Back Discharge
Supply
Air Flow Supply Air Flow
Return
Air Flow Return Air Flow
Air Coil
Air Coil
Air Coil
Air Coil
Front Front
Front Front
BSP BSP
ASPASP ASP ASP
ASP ASP ASPASP
CCP CCP
CCP CCP
BSP BSP
Return
Air Flow
Return
Air Flow Supply
Air Flow
Supply
Air Flow
Left Return Straight Discharge Right Return Straight Discharge
= mandatory 2Ⱦservice access
= (optional) additional 2Ⱦservice access
Notes:
1. 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.
2. CCP and BSP requires 2’ service access.
3. Blower service access is through back panel on straight
discharge units or through panel opposite air coil on back,
discharge units.
4. ASP are removable panels that provide additional access
to the units interior. Clear access toASP panels is not
required and they are not to be used in place of the
mandatory CC and BSP panels.
Legend:
CCP = Control/CompressorAccess Panel
BSP = Blower Service Panel
ASP =Additional Service Panel (not required)

Residential H&V - 60Hz HFC-410A:
Rev:January 30, 2017
8Geothermal Heating and Cooling
Water
Connection End
Return Air
Remove Screws
Water
Connection End
Return Air
Rotate
Move to Side
Side Discharge
Return Air
Water
Connection End
Discharge Air
Drain
Back Discharge
Replace Screws
Water
Connection End
Supply Duct
Return Air
Water
Connection End
Drain
Return Air
Discharge Air
Side Discharge
Back Discharge
Field Conversion of Air Discharge
Figure 5: Right Return Side to Back
Figure 4: Left Return Side to Back
Overview -
Horizontal units can be field converted between
side (straight) and back (end) discharge using the instructions
below.
Note: It is not possible to field convert return air between left or
right return models due to the necessity of refrigeration copper
piping changes.
Preparation - It is best to field convert the unit on the ground
before hanging. If the unit is already hung it should be taken
down for the field conversion.
Side to Back Discharge Conversion
1. Place unit in well lit area. Remove the screws as shown in
Figure 4 to free top panel and discharge panel.
2. Lift out the access panel and set aside. Lift and rotate
the discharge panel to the other position as shown, being
careful with the blower wiring.
3. Check blower wire routing and connections for tension or
contact with sheet metal edges. Reroute if necessary.
4. Check refrigerant tubing for contact with
other components.
5. Reinstall top panel and screws noting that the location for
some screws will have changed.
6. Manually spin the fan wheel to ensure that the wheel is
not rubbing or obstructed.
7. Replace access panels.
Back to Side Discharge Conversion - If the discharge is
changed from back to side, use above instruction noting that
illustrations will be reversed.
Left vs. Right Return - It is not possible to field convert return
air between left or right return models due to the necessity of
refrigeration copper piping changes. However, the conversion
process of side to back or back to side discharge for either
right or left return configuration is the same. In some cases,
it may be possible to rotate the entire unit 180 degrees if the
return air connection needs to be on the opposite side. Note
that rotating the unit will move the piping to the other end of the
unit.

9
Residential H&V - 60Hz HFC-410A
Rev:January 30, 2017
climatemaster.com
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Figure 6: Horizontal Condensate Connection
Horizontal Installation
Condensate Piping – Horizontal Units
Pitch the unit toward the drain as shown in Figure 2 to
improve the condensate drainage. On small units (less
than 2.5 tons/8.8 kW), insure that unit pitch does not cause
condensate leaks inside the cabinet.
Install condensate trap at each unit with the top of the trap
positioned below the unit condensate drain connection as
shown in Figure 6. Design the depth of the trap (water-seal)
based upon the amount of ESP capability of the blower
(where 2 inches [51mm] of ESP capability requires 2 inches
[51mm] of trap depth). As a general rule, 1-1/2 inch [38mm]
trap depth is the minimum.
Each unit must be installed with its own individual trap and
connection to the condensate line (main) or riser. Provide
a means to flush or blow out the condensate line. DO NOT
install units with a common trap and/or vent.
Always vent the condensate line when dirt or air can collect
in the line or a long horizontal drain line is required. Also vent
when large units are working against higher external static
pressure than other units connected to the same condensate
main since this may cause poor drainage for all units on the
line. WHEN A VENT IS INSTALLED IN THE DRAIN LINE, IT
MUST BE LOCATED AFTER THE TRAP IN THE DIRECTION
OF THE CONDENSATE FLOW.
 CAUTION! 
Duct System Installation
The duct system should be sized to handle the design
airflow quietly. Refer to Figure 3 for horizontal duct system
details or figure 8 for vertical duct system details. A flexible
connector is recommended for both discharge and return
air duct connections on metal duct systems to eliminate
the transfer of vibration to the duct system. To maximize
sound attenuation of the unit blower, the supply and return
plenums should include internal fiberglass duct liner or be
constructed from ductboard for the first few feet. Application
of the unit to uninsulated ductwork in an unconditioned
space is not recommended, as the unit’s performance will be
adversely affected.
At least one 90° elbow should be included in the supply
duct to reduce air noise. If air noise or excessive air flow is
a problem, the blower speed can be changed. For airflow
charts, consult specifications catalog for the series and
model of the specific unit.
If the unit is connected to existing ductwork, a previous
check should have been made to insure that the ductwork
has the capacity to handle the airflow required for the unit.
If ducting is too small, as in the replacement of a heating
only system, larger ductwork should be installed. All existing
ductwork should be checked for leaks and repaired as
necessary.
DUCT SYSTEM INSTALLATION
CAUTION! Ensure condensate line is pitched toward drain
1/8 inch per ft [11mm per m] of run.

Residential H&V - 60Hz HFC-410A:
Rev:January 30, 2017
10 Geothermal Heating and Cooling
Vertical Installation Clearances
Air Coil Side
Front
‡†1”
1”
1”
6”
*
Recommended Minimum Installation Clearances for Vertical Units*
1” Back of unit
Side opposite return air
6” Front if hard piped
Return Air Side
1”
Ducted return
- ‡ *Add for duct width
- † Add 2” for 1” filter frame/rail or 3” for 2” filter frame/rail
Free (open) return - calculate required dimension for a maximum
velocity of 600 fpm
*Field installed accessories (hoses, air cleaners, etc.) and factory WSE option will
require additional space.
Top supply air is shown, the same clearances apply to
bottom supply air units.
u
rn
ASPASP
Air Coil
Front
CCP and BSP
Supply Air
Opening
Notes:
1. 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.
2. 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.
3. ASP are removable panels that
provide additional access to the
units interior. Clear access toASP
panels is not required and they
are not to be used in place of the
mandatory CCPand BSP panels.
4. Top supply air is shown, the same
clearances apply to bottom supply
air units.
Legend:
CCP = Control/CompressorAccess Panel
BSP = Blower Service Panel
ASP =Additional Service Panel (not required)
u
rn
ASPASP
Air Coil
Front
CCP and BSP
Supply Air
Opening

11
Residential H&V - 60Hz HFC-410A
Rev:January 30, 2017
climatemaster.com
Vertical Installation
Figure 7: Vertical Unit Mounting
Figure 8: Typical Vertical Unit Installation Using Ducted
Return Air
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Flexible canvas duct
connector to reduce
noise and vibration
Use turning vanes in
supply transition
Internally insulate supply
duct for first 1.2 m each way
to reduce noise
Internally insulate return
transition duct to reduce noise Rev.: 2/13
Rounded return
transition
Remove supply duct
flanges from inside blower
compartment and install
on supply air opening of
unit. Do not use a supply
air plenum/duct smaller
than the size of the supply
duct flanges.
Vertical Unit Location
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
without removing unit from the mechanical room/closet.
Vertical units are typically installed in a mechanical room
or closet. Never install units in areas subject to freezing or
where humidity levels could cause cabinet condensation
(such as unconditioned spaces subject to 100% outside air).
Consideration should be given to access for easy removal of
the filter and access panels. Provide sufficient room to make
water, electrical, and duct connection(s).
If the unit is located in a confined space, such as a closet,
provisions must be made for return air to freely enter the
space by means of a louvered door, etc. Any access panel
screws that would be difficult to remove after the unit is
installed should be removed prior to setting the unit. Refer to
Figures 7 and 8 for typical installation illustrations. Refer to
unit specifications catalog for dimensional data.
1. Install the unit on a piece of rubber, neoprene or other
mounting pad material for sound isolation. The pad
should be at least 3/8” [10mm] to 1/2” [13mm] in
thickness. Extend the pad beyond all four edges of the
unit.
2. Provide adequate clearance for filter replacement
and drain pan cleaning. Do not block filter access
with piping, conduit or other materials. Refer to unit
specifications for dimensional data.
3. Provide access for fan and fan motor maintenance and
for servicing the compressor and coils without removing
the unit.
4. Provide an unobstructed path to the unit within the
closet or mechanical room. Space should be sufficient to
allow removal of the unit, if necessary.
5. Provide access to water valves and fittings and
screwdriver access to the unit side panels, discharge
collar and all electrical connections.
Downflow units may be installed directly on the floor. The
optional internal electric heat is rated for zero clearance to
combustible materials.
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.

Residential H&V - 60Hz HFC-410A:
Rev:January 30, 2017
12 Geothermal Heating and Cooling
Vertical Installation
Return
Air Inlet
Figure 9: Vertical Sound Attenuation
Vent
*3/4" FPT
3/4"PVC
Alternate
Condensate
Location
Water
Connections
1/8" per foot
slope to drain
Figure 10a: Vertical Unit with Internal Condensate Trap
Figure 10c: Vertical Internal Condensate Trap
Condensate Piping for Vertical Units - Some units utilize
a condensate hose inside the cabinet as a trapping loop;
therefore an external trap is not necessary, other units require
an external condensate trap. Observe the condensate drain
connection to determine if a field provided trap is necessary.
Units with a PVC socket connection are internally trapped,
units with stainless steel MPT connection require an external
trap. Figures 10a and b show typical condensate connections.
Figure 10c illustrates the internal trap that is present in some
units. Each unit must be installed with its own individual trap
and connection to the condensate line (main) or riser. Provide
a means to flush or blow out the condensate line. DO NOT
install units with a common trap and/or vent.
Always vent the condensate line when dirt or air can collect
in the line or a long horizontal drain line is required. Also vent
when large units are working against higher external static
pressure than other units connected to the same condensate
main since this may cause poor drainage for all units on the
line. WHEN A VENT IS INSTALLED IN THE DRAIN LINE, IT
MUST BE LOCATEDAFTER THE TRAP IN THE DIRECTION
OF THE CONDENSATE FLOW.
Install the external condensate trap with the top of the trap
positioned below the unit condensate drain connection as
shown in figure 10b. Design the depth of the trap (water-seal)
based upon the amount of the ESP capability of the blower
(ex. 2 inches (51mm) of ESP capability requires 2 inches
(51mm) of trap depth). As a general rule, 1-1/2 inch (38mm)
trap depth is the minimum.
Sound Attenuation for Vertical Units - Sound attenuation
is achieved by enclosing the unit within a small mechanical
room or a closet. Additional measures for sound control
include the following:
1. Mount the unit so that the return air inlet is 90° to the
return air grille. Refer to Figure 9. Install a sound baffle
as illustrated to reduce line-of sight sound transmitted
through return air grilles.
2.
Mount the unit on a Tranquility Unit Isolation Pad to
minimize vibration transmission to the building structure.
For more information on Tranquility Unit Isolation Pads,
contact your distributor.
ರ
ರ
ರ
ರ3HU
)RRW
Figure 10b: Vertical Unit with External Condensate Trap
 CAUTION! 
CAUTION! Ensure condensate line is pitched toward drain
1/8 inch per ft [11mm per m] of run.

13
Residential H&V - 60Hz HFC-410A
Rev:January 30, 2017
climatemaster.com
Water Connection Installation
External Flow Controller Mounting
The Flow Controller can be mounted beside the unit as
shown in Figure 12. Review the Flow Controller installation
manual for more details.
Gasket
Swivel Nut
Stainless steel
snap ring
Brass Adaptor
Hand Tighten
Only!
Do Not
Overtighten!
Figure 11: Water Connections
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
The typical closed loop ground source system is shown in
Figure 12. All earth loop piping materials should be limited to
polyethylene fusion only for in-ground sections of the loop.
Galvanized or steel fittings 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. A flanged fitting should be substituted.
P/T plugs should be used so that flow can be measured using
the pressure drop of the unit heat exchanger.
Earth loop temperatures can range between 25 and
110°F [-4 to 43°C]. Flow rates between 2.25 and 3 gpm
per ton [2.41 to 3.23 l/m per kW] of cooling capacity is
recommended in these applications.
Test individual horizontal loop circuits before backfilling.
Test vertical U-bends and pond loop assemblies prior to
installation. Pressures of at least 100 psi [689 kPa] should be
used when testing. Do not exceed the pipe pressure rating.
Test entire system when all loops are assembled.
Flushing the Earth Loop
Once piping is completed between the unit, Flow Controller
and the ground loop (Figure 12), the loop is ready for final
purging and charging. A flush cart with at least a 1.5 hp
[1.1 kW] pump is required to achieve enough fluid velocity
in the loop piping system to purge air and dirt particles. An
GROUND-LOOP HEAT PUMP APPLICATIONS
 CAUTION! 
High and
Low Voltage
Knockouts
Vibration Isolation Pad
To Thermostat
Figure 12: Typical Ground-Loop Application
CAUTION! The following instructions represent industry
accepted installation practices for closed loop earth coupled
heat pump systems. Instructions are provided to assist the
contractor in installing trouble free ground loops. These
instructions are recommendations only. State/provincial
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.
Water Connections
Residential models utilize swivel piping fittings for water
connections that are rated for 450 psi (3101 kPa) operating
pressure. The connections have a rubber gasket seal similar
to a garden hose gasket, which when mated to the flush
end of most 1” threaded male pipe fittings provides a leak-
free seal without the need for thread sealing tape or joint
compound. Check for burrs and ensure that the rubber seal
is in the swivel connector prior to attempting any connection
(rubber seals are shipped attached to the swivel connector).
DO NOT OVER TIGHTEN or leaks may occur.
The female locking ring is threaded onto the pipe threads
which holds the male pipe end against the rubber gasket,
and seals the joint. HAND TIGHTEN ONLY! DO NOT
OVERTIGHTEN!

Residential H&V - 60Hz HFC-410A:
Rev:January 30, 2017
14 Geothermal Heating and Cooling
Ground-Loop Heat Pump Applications
antifreeze solution is used in most areas to prevent freezing.
All air and debris must be removed from the earth loop piping
before operation. Flush the loop with a high volume of water
at a minimum velocity of 2 fps (0.6 m/s) in all piping. The
steps below must be followed for proper flushing.
1. Fill loop with water from a garden hose through the flush
cart before using the flush cart pump to insure an even fill.
2. Once full, the flushing process can begin. Do not allow
the water level in the flush cart tank to drop below the
pump inlet line to avoid air being pumped back out to
the earth loop.
3. Try to maintain a fluid level in the tank above the return
tee so that air cannot be continuously mixed back into
the fluid. Surges of 50 psi (345 kPa) can be used to help
purge air pockets by simply shutting offthe return valve
going into the flush cart reservoir. This “dead heads” the
pump to 50 psi (345 kPa). To purge, dead head the pump
until maximum pumping pressure is reached. Open the
return valve and a pressure surge will be sent through the
loop to help purge air pockets from the piping system.
4. Notice the drop in fluid level in the flush cart tank when
the return valve is shut off. If air is adequately purged from
the system, the level will drop only 1-2 inches (2.5 - 5 cm)
in a 10” (25 cm) diameter PVC flush tank (about a half
gallon [2.3 liters]), since liquids are incompressible. If the
level drops more than this, flushing should continue since
air is still being compressed in the loop fluid. Perform the
“dead head” procedure a number of times. Note: This
fluid level drop is your only indication of air in the loop.
5. Consult ClimaDry AOM for flushing instructions
for units equipped with ClimaDry Whole House
Dehumidification option.
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,
perform final flush and pressurize the loop to a static
pressure of 50-75 psi [345-517 kPa] (winter) or 35-40 psi
[241-276 kPa] (summer). After pressurization, be sure to
loosen the plug at 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 that the Flow Controller provides
adequate flow through the unit by checking pressure drop
across the heat exchanger and compare to the pressure
drop tables at the back of the manual.
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, antifreeze is required. Alcohols
and glycols are commonly used as antifreeze; however your
local sales manager should be consulted for the antifreeze
best suited to your area. Low temperature 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 low temperature protection should be at 15°F [-10°C].
Calculation is as follows:
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 the water level to prevent fumes. Calculate the
total volume of fluid in the piping system. Then use the
percentage by volume shown in Table 2 for the amount
of antifreeze needed. Antifreeze concentration should be
checked from a well mixed sample using a hydrometer to
measure specific gravity.
Table 1: Approximate Fluid Volume (gal.) per 100' of Pipe
Fluid Volume (gal [liters] per 100’ [30 meters) Pipe)
Pipe Size Volume (gal) [liters]
Copper
1” 4.1 [15.3]
1.25” 6.4 [23.8]
2.5” 9.2 [34.3]
Rubber Hose 1” 3.9 [14.6]
Polyethylene
3/4” IPS SDR11 2.8 [10.4]
1” iPS SDR11 4.5 [16.7]
1.25” IPS SDR11 8.0 [29.8]
1.5” IPS SDR11 10.9 [40.7]
2” IPS SDR11 18.0 [67.0]
1.25” IPS SCH40 8.3 [30.9]
1.5” IPS SCH40 10.9 [40.7]
2” IPS SCH40 17.0 [63.4]
Unit Heat Exchanger Typical 1.0 [3.8]
Flush Cart Tank 10” Dia x 3ft tall
[254mm x 91.4cm tall] 10 [37.9]
Low Water Temperature Cutout Setting - CXM Control
When antifreeze is selected, the FP1 jumper (JW3) should
be clipped to select the low temperature (antifreeze 10°F
[-12.2°C]) set point and avoid nuisance faults (see “Low
Water Temperature Cutout Selection” in this manual). Note:
Low water temperature operation requires extended range
equipment.

15
Residential H&V - 60Hz HFC-410A
Rev:January 30, 2017
climatemaster.com
Table 2: Antifreeze Percentages by Volume
Ground-Loop Heat Pump Applications
GROUND-WATER HEAT PUMP APPLICATIONS
Open Loop - Ground Water Systems
Typical open loop piping is shown in Figure 13. Shut off
valves should be included for ease of servicing. Boiler drains
or other valves should be “tee’d” into the lines to allow acid
flushing of the heat exchanger. Shut offvalves should be
positioned to allow flow through the coax via the boiler drains
without allowing flow into the piping system. P/T plugs
should be used so that pressure drop and temperature can be
measured. Supply and return water piping should be limited to
copper, HPDE, or other acceptable high temperature material.
Note that PVC or CPVC material is not recommended as they
are not compatible with the polyolester oil used in HFC-410A
products.
Water quantity should be plentiful and of good quality.
Consult table 3 for water quality guidelines. The unit can
be ordered with either a copper or cupro-nickel water
heat exchanger. Consult table 3 for recommendations.
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, an open loop system
is not recommended. Heat exchanger coils may over time
lose heat exchange capabilities due to build up of mineral
deposits. Heat exchangers must only be serviced by a
qualified technician, as acid and special pumping equipment
is required. Desuperheater coils can likewise become scaled
and possibly plugged. In areas with extremely hard water,
the owner should be informed that the heat exchanger
may require occasional acid flushing. In some cases, the
desuperheater option should not be recommended due to
hard water conditions and additional maintenance required.
Water Quality Standards
Table 3 should be consulted for water quality requirements.
Scaling potential should be assessed using the pH/Calcium
hardness method. If the pH <7.5 and the Calcium hardness
is less than 100 ppm, scaling potential is low. If this method
yields numbers out of range of those listed, the Ryznar
Stability and Langelier Saturation indecies should be
calculated. Use the appropriate scaling surface temperature
for the application, 150°F [66°C] for direct use (well water/
open loop) and DHW (desuperheater); 90°F [32°F] for
indirect use. A monitoring plan should be implemented in
these probable scaling situations. Other water quality issues
such as iron fouling, corrosion prevention and erosion and
clogging should be referenced in Table 3.
Pressure Tank and Pump
Use a closed, bladder-type pressure tank to minimize
mineral formation due to air exposure. The pressure tank
should be sized to provide at least one minute continuous
run time of the pump using its drawdown capacity rating to
prevent pump short cycling. Discharge water from the unit
is not contaminated in any manner and can be disposed
of in various ways, depending on local building codes (e.g.
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.
The pump should be sized to handle the home’s domestic
water load (typically 5-9 gpm [23-41 l/m]) plus the flow rate
required for the heat pump. Pump sizing and expansion
tank must be chosen as complimentary items. For example,
an expansion tank that is too small can causing premature
pump failure due to short cycling. Variable speed pumping
applications should be considered for the inherent energy
savings and smaller pressure tank requirements.
Water Control Valve
Note the placement of the water control valve in figure 13.
Always maintain water pressure in the heat exchanger by
placing the water control valve(s) on the discharge line
to prevent mineral precipitation during the off-cycle. Pilot
operated 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 ‘VA’ draw of the valve
can be supplied by the unit transformer. For instance, a slow
closing valve can draw up to 35VA. This can overload smaller
40 or 50 VA transformers depending on the other controls
in the circuit. A typical pilot operated solenoid valve draws
approximately 15VA (see Figure 22). Note the special wiring
diagrams for slow closing valves (Figures 23 & 24).
Flow Regulation
Flow regulation can be accomplished by two methods. One
method of flow regulation involves simply adjusting the ball
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
Propylene Glycol
Ethanol*
21%
29%
23%
17%
24%
20%
13%
18%
16%
8%
12%
11%
* Must not be denatured with any petroleum based product

Residential H&V - 60Hz HFC-410A:
Rev:January 30, 2017
16 Geothermal Heating and Cooling
Vibration
Isolation Pad
Unit Power
Disconnect
High and low
voltage
knockouts
Pressure
Ta n k
Shut-Off
Valve
Boiler
Drains
Flow
Regulator
Water In
Water Out
Water
Control
Valve
Optional
Filter
P/T Plugs
To Thermostat
Figure 13: Typical Open Loop/Well Application
Ground-Water Heat Pump Applications
valve or water control valve on the discharge line. Measure the
pressure drop through the unit heat exchanger, and determine
flow rate from tables 9a through 9c. Since the pressure is
constantly varying, two pressure gauges may be needed.
Adjust the valve until the desired flow of 1.5 to 2 gpm per ton
[2.0 to 2.6 l/m per kW] is achieved. A second method of flow
control requires a flow control device mounted on the outlet of
the water control valve. The device is typically a brass fitting
with an orifice of rubber or plastic material that is designed
to allow a specified flow rate. On occasion, flow control
devices may produce velocity noise that can be reduced by
applying some back pressure from the ball valve located on
the discharge line. Slightly closing the valve will spread the
pressure drop over both devices, lessening the velocity noise.
NOTE: When EWT is below 50°F [10°C], a minimum of 2
gpm per ton (2.6 l/m per kW) is required.
Water Coil Low Temperature Limit Setting
For all open loop systems the 30°F [-1.1°C] FP1 setting
(factory setting-water) should be used to avoid freeze
damage to the unit. See “Low Water Temperature Cutout
Selection” in this manual for details on the low limit setting.
 CAUTION! 
CAUTION! Refrigerant pressure activated water regulating
valves should never be used with this equipment.
 WARNING! 
WARNING! Polyolester Oil, commonly known as POE
oil, is a synthetic oil used in many refrigeration systems
including those with HFC-410A refrigerant. POE oil, if it
ever comes in contact with PVC or CPVC piping, may
cause failure of the PVC/CPVC. PVC/CPVC piping should
never be used as supply or return water piping with water
source heat pump products containing HFC-410A as
system failures and property damage may result.

17
Residential H&V - 60Hz HFC-410A
Rev:January 30, 2017
climatemaster.com
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 Limits 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 66°C HWG and
Direct well, 29°C 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 as hydroxide, chloride,
nitrate and sulfate compounds All -<0.5 ppm
Maximum
Maximum Allowable at maximum water temperature.
Chloride Levels
10$C24$C38
C
Copper
Cupronickel -<20ppm NR NR
-<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 1.8 m/s
Filtered for maximum
841 micron [0.84 mm,
20 mesh] size.
<10 ppm (<1 ppm "sandfree” for reinjection) of particles and a maximum
velocity of 1.8 m/s. Filtered for maximum 841 micron 0.84 mm,
20 mesh] size. Any particulate that is not removed can potentially
clog components.
Notes:
Rev.: 5/6/2014 S
• 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 66°C for direct use and HWG applications, and at 32°C for indirect HX use.
A monitoring plan should be implemented.
The ClimateMaster Water Quality Table provides water quality requirements for ClimateMaster coaxial heat exchangers. The water should be evaluated by an
independent testing facility comparing to this Table and when properties are outside of these requirements, an external secondary heat exchanger must be used to
isolate the heat pump heat exchanger from the unsuitable water. Failure to do so will void the warranty for the coaxial heat exchanger and any other components
damaged by a leak.
Water Quality Standards
Table 3: Water Quality Standards

Residential H&V - 60Hz HFC-410A:
Rev:January 30, 2017
18 Geothermal Heating and Cooling
Electric water heaters are recommended. If a gas, propane,
or oil water heater is used, a second preheat tank must be
installed (Figure 15). If the electric water heater has only a
single center element, the dual tank system is recommended
to insure a usable entering water temperature for the HWG.
Typically a single tank of at least 52 gallons (235 liters) is
used to limit installation costs and space. However, a dual
tank, as shown in Figure 15, is the most efficient system,
providing the maximum storage and temperate source water
to the HWG.
It is always advisable to use water softening equipment on
domestic water systems to reduce the scaling potential and
lengthen equipment life. In extreme water conditions, it may
be necessary to avoid the use of the HWG option since the
potential cost of frequent maintenance may offset or exceed
any savings. Consult Table 3 for scaling potential tests.
HotWater Generator
The HWG (Hot Water Generator) or desuperheater option
provides considerable operating cost savings by utilizing
excess heat energy from the heat pump to help satisfy
domestic hot water requirements. The HWG is active
throughout the year, providing virtually free hot water when
the heat pump operates in the cooling mode or hot water at
the COP of the heat pump during operation in the heating
mode. Actual HWG water heating capacities are provided in
the appropriate heat pump performance data.
Heat pumps equipped with the HWG option include a built-
in water to refrigerant heat exchanger that eliminates the
need to tie into the heat pump refrigerant circuit in the field.
The control circuit and pump are also built in for residential
equipment. Figure 14 shows a typical example of HWG water
piping connections on a unit with built-in circulating pump.
This piping layout reduces scaling potential.
The temperature set point of the HWG is field selectable
to 125°F or 150°F . The 150°F set point allows more heat
storage from the HWG. For example, consider the amount
of heat that can be generated by the HWG when using the
125°F set point, versus the amount of heat that can be
generated by the HWG when using the 150°F set point.
In a typical 50 gallon two-element electric water heater
the lower element should be turned down to 100°F, or the
lowest setting, to get the most from the HWG. The tank will
eventually stratify so that the lower 80% of the tank, or 40
gallons, becomes 100°F (controlled by the lower element).
The upper 20% of the tank, or 10 gallons, will be maintained
at 125°F (controlled by the upper element).
Using a 125°F set point, the HWG can heat the lower 40
gallons of water from 100°F to 125°F, providing up to 8,330
btu’s of heat. Using the 150°F set point, the HWG can heat
the same 40 gallons of water from 100°F to 150°F and the
remaining 10 gallons of water from 125°F to 150°F, providing
a total of up to 18,743 btu’s of heat, or more than twice as
much heat as when using the 125°F set point.
This example ignored standby losses of the tank. When
those losses are considered the additional savings are even
greater.
Figure 14: Typical HWG Installation
Figure 15: HWG Double Tank Installation
 WARNING! 
WARNING! A 150°F SETPOINT MAY LEAD TO
SCALDING OR BURNS. THE 150°F SET POINT MUST
ONLY BE USED ON SYSTEMS THAT EMPLOY AN
APPROVED ANTI-SCALD VALVE.
Hot Outlet
to home
Insulated water lines -
5/8” OD, 50 ft maximum (one way)
[16mm OD, 15 meters maximum]
Powered
Water
Heater
Upper
element to
120 - 130°F
[49 - 54°C]
Lower
element to
100 - 110°F
[38 - 43°C]
Shut-off
Valve #3
Shut Off
Valve #2
Field supplied 3/4’ brass nipple and ‘T’
Cold
Inlet
Shut Off
Valve #4
Shut Off
Valve #1
Insulated water lines - 5/8” OD, 50 ft maximum (one way)
[16mm OD, 15 meters maximum]
Upper element to 130°F [54°C]
(or owner preference)
Cold Inlet
Hot Outlet to
house
Powered
Water Heater
Cold Inlet from
Domestic supply
Hot Outlet
Unpowered
Water Heater
Field Supplied 3/4” brass nipple and “T”
Lower element to 120°F [49°C]
Shut-off
Valve #1
Shut-off
Valve #4
Shut-off
Valve #3
Shut Off
Valve #2

19
Residential H&V - 60Hz HFC-410A
Rev:January 30, 2017
climatemaster.com
HotWater Generator
The microprocessor control monitors the refrigerant and
water temperatures to determine when to operate the HWG.
The HWG will operate any time the refrigerant temperature
is sufÄciently above the water temperature. Once the
HWG has satisÄed the water heating demand during a
heat pump run cycle, the controller will cycle the pump at
regular Intervals to determine if an additional HWG cycle
can be utilized. The microprocessor control Includes 3 DIP
switches, SW10 (HWG PUMP TEST), SW11 (HWG TEMP),
and SW12 (HWG STATUS).
SW10 HWG PUMP TEST. When this switch is in the “ON”
position, the HWG pump is forced to operate even if there
is no call for the HWG. This mode may be beneÄcial to
assist in purging the system of air during Initial start up.
When SW10 is in the “OFF” position, the HWG will operate
normally. This switch is shipped from the factory in the
“OFF” (normal) position. NOTE; If left in the “On” position for
5 minutes, the pump control will revert to normal operation.
SW11 HWG TEMP. The control setpoint of the HWG can
be set to either of two temperatures, 125°F or 150°F. When
SW11 is in the “ON” position the HWG setpoint is 150°F.
When SW11 is in the “OFF” position the HWG setpoint is
ѥWARNING! ѥ
ѥWARNING! ѥ
WARNING! UNDER NO CIRCUMSTANCES SHOULD
THE SENSORS BE DISCONNECTED OR REMOVED
AS FULL LOAD CONDITIONS CAN DRIVE HOT
WATER TANK TEMPERATURES FAR ABOVE SAFE
TEMPERATURE LEVELS IF SENSORS HAVE BEEN
DISCONNECTED OR REMOVED.
WARNING! USING A 150°F SETPOINT ON THE
HWG WILL RESULT IN WATER TEMPERATURES
SUFFICIENT TO CAUSE SEVERE PHYSICAL INJURY
IN THE FORM OF SCALDING OR BURNS, EVEN
WHEN THE HOT WATER TANK TEMPERATURE
SETTING IS VISIBLY SET BELOW 150°F. THE 150°F
HWG SETPOINT MUST ONLY BE USED ON SYSTEMS
THAT EMPLOY AN APPROVED ANTI-SCALD VALVE
(PART NUMBER AVAS4) AT THE HOT WATER
STORAGE TANK WITH SUCH VALVE PROPERLY
SET TO CONTROL WATER TEMPERATURES
DISTRIBUTED TO ALL HOT WATER OUTLETS AT A
TEMPERATURE LEVEL THAT PREVENTS SCALDING
OR BURNS!
125°F. This switch Is shipped from the factory in the “OFF”
(125°F) position.
SW12 HWG STATUS. This switch controls operation of
the HWG. When SW12 is in the “ON” position the HWG is
disabled and will not operate. When SW12 is in the “OFF”
position the HWG is in the enabled mode and will operate
normally. This switch is shipped from the factory in the
“ON” (disabled) position. CAUTION: DO NOT PLACE THIS
SWITCH IN THE ENABLED POSITION UNITL THE HWG
PIPING IS CONNECTED, FILLED WITH WATER, AND
PURGED OR PUMP DAMAGE WILL OCCUR.
When the control is powered and the HWG pump output
is not active, the status LED (AN1) will be “On”. When the
HWG pump output is active for water temperature sampling
or HWG operation, the status LED will slowly Åash (On 1
second, Off 1 second).
If the control has detected a fault, the status LED will Åash a
numeric fault code as follows:
Hot Water Sensor Fault 1 Åash
Compressor Discharge sensor fault 2 Åashes
High Water Temperature (>160ºF) 3 Åashes
Control Logic Error 4 Åashes
Fault code Åashes have a duration of 0.4 seconds with
a 3 second pause between fault codes. For example, a
“Compressor Discharge sensor fault” will be four Åashes
0.4 seconds long, then a 3 second pause, then four Åashes
again, etc.
C
H
M
WATER HEATER
CHECK VALVE
8” MAX
HOT WATER
TO HOUSE
ANTI-SCALD
VALVE
ANTI-SCALD
VALVE PIPING
CONNECTIONS
COLD WATER
SUPPLY
Installation
The HWG is controlled by two sensors and a microprocessor
control. One sensor is located on the compressor discharge
line to sense the discharge refrigerant temperature. The
other sensor is located on the HWG heat exchanger’s “Water
In” line to sense the potable water temperature.

Residential H&V - 60Hz HFC-410A:
Rev:January 30, 2017
20 Geothermal Heating and Cooling
Warning! The HWG pump Is fully wired from the
factory. Use extreme caution when working around
the microprocessor control as it contains line voltage
connections that presents a shock hazard that can
cause severe injury or death!
The heat pump, water piping, pump, and hot water tank
should be located where the ambient temperature does
not fall below 50°F [10°C]. Keep water piping lengths at a
minimum. DO NOT use a one way length greater than 50 ft.
(one way) [15 m]. See Table 7 for recommended piping sizes
and maximum lengths.
All installations must be in accordance with local codes. The
installer is responsible for knowing the local requirements,
and for performing the installation accordingly. DO NOT
connect the pump wiring until “Initial Start-Up” section,
below. Powering the pump before all installation steps are
completed may damage the pump.
Water Tank Preparation
1. Turn offpower or fuel supply to the hot water tank.
2. Connect a hose to the drain valve on the water tank.
3. Shut offthe cold water supply to the water tank.
4. Open the drain valve and open the pressure relief valve
or a hot water faucet to drain tank.
5. When using an existing tank, it should be flushed with
cold water after it is drained until the water leaving the
drain hose is clear and free of sediment.
6. Close all valves and remove the drain hose.
7. Install HWG water piping.
HWG Water Piping
1. Using at least 5/8” [16mm] O.D. copper, route and install
the water piping and valves as shown in Figures 14 or
15. Install an approved anti-scald valve if the 150°F HWG
setpoint is or will be selected. An appropriate method
must be employed to purge air from the HWG piping.
This may be accomplished by flushing water through the
HWG (as In Figures 14 and 15) or by Installing an air vent
at the high point of the HWG piping system.
2. Insulate all HWG water piping with no less than 3/8”
[10mm] wall closed cell insulation.
3. Open both shut offvalves and make sure the tank drain
valve is closed.
Water Tank Refill
1. Close valve #4. Ensure that the HWG valves (valves #2
and #3) are open. Open the cold water supply (valve #1)
to fill the tank through the HWG piping. This will purge air
from the HWG piping.
2. Open a hot water faucet to vent air from the system until
water flows from faucet; turn offfaucet. Open valve #4.
3. Depress the hot water tank pressure relief valve handle to
ensure that there is no air remaining in the tank.
4. Inspect all work for leaks.
5.
Before restoring power or fuel supply to the water heater,
adjust the temperature setting on the tank thermostat(s)
to insure maximum utilization of the heat available from
the refrigeration system and conserve the most energy.
On tanks with both upper and lower elements and
thermostats, the lower element should be turned down
to 100°F [38°C] or the lowest setting; the upper element
should be adjusted to 120-130°F [49-54°C]. Depending
upon the specific needs of the customer, you may want
to adjust the upper element differently. On tanks with a
single thermostat, a preheat tank should be used (Fig 15).
6. Replace access cover(s) and restore power or
fuel supply.
Initial Start-Up
1. Make sure all valves in the HWG water circuit are
fully open.
2. Turn on the heat pump and allow it to run for
10-15 minutes.
3. Set SW12 to the “OFF” position (enabled) to engage the
HWG.
4. The HWG pump should not run if the compressor is not
running.
5. The temperature difference between the water entering
and leaving the HWG coil should be approximately
5-10°F [3-6°C].
6. Allow the unit to operate for 20 to 30 minutes to insure
that it is functioning properly.
HotWater Generator
Table 7: HWG Water Piping Sizes and Length
Unit
Nominal
Tonnage
Nominal
HWG Flow
(gpm)
1/2" Copper
(max length*) 3/4" Copper (max length*)
1.5 0.6 50 -
2.0 0.8 50 -
2.5 1.0 50 -
3.0 1.2 50 -
3.5 1.4 50 -
4.0 1.6 45 50
5.0 2.0 25 50
6.0 2.4 10 50
*Maximum length is equivalent length (in feet) one way of type L
copper.
 CAUTION! 
CAUTION! Use only copper piping for HWG piping due to
the potential of high water temperatures for water that has
been in the HWG heat exchanger during periods of no-flow
conditions (HWG pump not energized). Piping other than
copper may rupture due to high water temperature and
potable water pressure.