ClimateMaster THW Series Guide

Tranquility Water-to-Water (THW) Series
50 & 60Hz Models
Residential High Temperature
Water-to-Water
Geothermal Heat Pumps
(Heating Only)
Installation, Operation &
Maintenance Instructions
97B0063N01
Revision: 30 June, 2008B
THW Series
Table of Contents
Model Nomenclature 2
General Information 3
Physical Data 4
Dimensional Data 5
Installation 6
Load Plumbing Installation 7
Ground-Water Heat Pump Application 8
Water Quality Standards 9
Ground-Loop Heat Pump Application 10
Electrical - Power Wiring 13
Electrical - Low Voltage Wiring 13
Electrical - Controls 16
User Interface 19
Installer Interface 20
Wiring Diagram Matrix 21
Typical Wiring Diagrams 22
Unit Starting & Operating Conditions 34
Unit & System Checkout 35
Unit Start-Up Procedure 36
Preventive Maintenance 37
Warranty 38
Revision History 40

Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B
2
MODEL NOMENCLATURE
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.
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.
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! �
� WARNING! �
� CAUTION! �
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.
TH W A0 0 8 QG 0 0 C S A S
1 2 34 5 6 7
8
9101112131415
TH = Tranquility High Temperature
Heating Only
Model Type
W= Water-To-Water
Configuration
Unit Size
008 (50Hz Only)
010 (50Hz & 60Hz)
Revision Level
A= Current
Voltage
Controls0 = Residential Standard (Ultra Quiet)
Cabinet Insulation
Domestic Hot Water Heating Options
C= Copper Source & Braze Plate Load
Source & Load Water Coil Options
N= Cupro-nickel Source & Braze Plate Load
A= None
Hydronic Options
B= Load Pump W/Expansion Tank
S = Standard
0 = None
Paint Options
S= Stainless Steel & Pewter (Black)
012 (50Hz Only)
1 = 3-Way Valve
C= Load Pump & Source Pump(S)
W/Expansion Tanks
Q= Standard 50Hz
V= Standard 50Hz With VSFP
W= Standard 60Hz
Y= Standard 60Hz With VSFP
G= 208-230/60/1 (THW010 Only)
T= 200-220/50/1 (THW008-010 Only)
S= 380-420/50/3 (THW012 Only)
Rev.: 12 Nov, 2008B
� WARNING! �
WARNING! Units are shipped with R-410A (EarthPure®)
refrigerant. The EarthPure®Application and Service Manual
should be read and understood before attempting to service
refrigerant circuits with R-410A.

Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B 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. 



 Notify the ClimateMaster Trafc Department of all
damage within fteen (15) days of shipment.

Equipment should be stored in its shipping carton in a
clean, dry area. Store units in an upright position at all
times. Stack units a maximum of 3 units high.
Unit Protection
Cover units on the job site with either shipping cartons,
vinyl lm, 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 trash
found in or on these components.
Pre-Installation
Installation, Operation, and Maintenance instructions
are provided with each unit.. The installation site chosen
should include adequate service clearance around the
unit. Before unit start-up, read all manuals and become
familiar with the unit and its operation. Thoroughly check
the system before operation.
Prepare units for installation as follows:
1. Compare the electrical data on the unit nameplate
with ordering and shipping information to verify that
the correct unit has been shipped.
2. Keep the cabinet covered with the shipping carton
until installation is complete and all plastering,
painting, etc. is 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. Locate and verify any HWG or other accessory
sensors located in the compressor section.
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.
� CAUTION! �
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.
� CAUTION! �

Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B
4
PHYSICAL DATA
 008* 010 012*
Compressor (qty) Scroll (1)
Factory Charge R410A (oz) [kg] 92 [2.51] 88 [2.50] 100 [2.84]

IPT (in) 1 1 1

IPT (in) 1 1 1

IPT (in) 1 1 1

Base Unit (PSIG) [kPa] 500 [3445] 500 [3445] 500 [3445]
DHW Option (PSIG) [kPa] 500 [3445] 500 [3445] 500 [3445]
Internal Source Pump
w/Expansion Tank (PSIG) [kPa] 45 [310] 45 [310] 45 [310]
Internal Load Pump
w/Expansion Tank (PSIG) [kPa] 45 [310] 45 [310] 45 [310]
Weight - Operating, (lbs) [kg] 455 [207] 455 [207] 515 [234]
Weight - Packaged, (lbs) [kg] 470 [214] 470 [214] 530 [241]
*50Hz models only
Dual isolation compressor mounting
Balanced Port Expansion Valve (TXV)
Insulated Source and Load Water Coils

Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B 5
Notes:
1. Front, Side, and Top access is preferred for service access.
However, all components may be serviced from the front and
Top access panels if side access is not available.
2. While clear access to all removable panels is not required,
installer should take care to comply with all building codes
and allow adequate clearance for future eld service.
DIMENSIONS
1.9” [4.9cm]
2.1” [5.3cm]
Model
Overall Cabinet Water Connections Electric Access Plugs
123456
A
Depth B Width C Height
D
Source
(Outdoor)
Water In
E
Source
(Outdoor)
Water Out
F
Load
(Indoor)
Water In
G
Load
(Indoor)
Water Out
H
DHW
Return In
J
DHW
Water Out
K
Low
Voltage
L
Low
Voltage
M
Power
Supply
008 in. 26.8 25.6 48.9 3.4 8.1 22.3 11.3 17.7 14.4 33.6 35.6 38.0
cm. 68.1 65.1 124.2 8.6 20.6 56.6 28.7 45.0 36.6 85.3 90.4 96.5
010 in. 26.8 25.6 48.9 3.4 8.1 22.3 11.3 17.7 14.4 33.6 35.6 38.0
cm. 68.1 65.1 124.2 8.6 20.6 56.6 28.7 45.0 36.6 85.3 90.4 96.5
012 in. 26.8 25.6 48.9 3.4 8.1 22.3 11.3 17.7 14.4 33.6 35.6 38.0
cm. 68.1 65.1 124.2 8.6 20.6 56.6 28.7 45.0 36.6 85.3 90.4 96.5

Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B
6
THW 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.








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
sufcient room to make water and electrical connections.
Any access panel screws that would be difcult 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.

Theapplicationsaretoovariedtodescribeinthisdocument,
howeversomebasicguidelineswillbepresented.Allplumbing
should conform to local codes and consider the following:


- Employ piping materials that are rated for the
maximum temperature and pressure combination.
This excludes PVC for most heating applications.
- Insure load water ow in high temperature heating
applications is at least 3 gpm per ton [3.2 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.

- Recommended application includes a brazed plate
heat exchanger to isolate pool water from the unit
heat exchanger.
Potable Water Applications
- Insure load water ow in high temperature heating
applications is at least 3 gpm per ton [3.2 l/m per kW]
to improve performance and reduce nuisance high
pressure faults.
- A secondary heat exchanger must always be used
between the water-to-water heat pump and potable
water tank. Either an indirect water heat or brazed
plate heat exchanger (with a secondary pump) will
isolate the potable water from the heating water.
LOAD PLUMBING INSTALLATION

Loadpipingconnectionsaredesignated‘LoadWaterInand
Out’ for the radiant heating system piping, and ‘DHW Water
InandOut’(optional)forconnectiontothedomestichotwater
piping. Any unused piping connections on the load side of
the THW unit will allow spillage of the load circuit uid, as
the radiant and DHW circuits are connected internally.



         



Source HX
(coaxial)
Load HX
(brz plt)
INOUTIN OUTOUT
HTG DHW
M
DHW
IN
HTG
To
DHW
Storage
Tank

Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B 7
LOAD PLUMBING INSTALLATION

Indirect
Water Heater
Heating
Buffer Tank
NOTES:
1. Place air vent at the highest point in the system. If
internal expansion tanks are installed, only an air
vent is required.
2. Thermistors should be installed in an immersion well.
Locate thermistor in the bottom half of the tank.
3. If electric water heat is used instead of buffer tank, see
drawing 2-7.
4. P/T (pressure/temperature) ports are internal for THW
units on load and source connections.
5. Other components (additional ball valves, unions, etc.)
may be required for ease of service. This drawing
shows only minimum requirements. Your specific
installation will dictate final component selections.
6. Buffer tank must be approved as a heating vessel.
7. Local code supercedes any piping arrangements or
components shown on this drawing.
To/From
Radiant Floor,
Radiator,
Baseboard,
or Fan Coil
Heating System
H C
H C
Exp
Tank
Note 1
Air Vent
Drawing 2-1: THW Typical Load Piping
Indirect Water Heater / No Cooling or Separate Cooling System
See drawings in section 3 for Source connections
03Oct07
Note 3
THW
Unit
Source HX
(coaxial)
Load HX
(brz plt)
INOUTIN OUTOUT
HTG DHW
M
DHW
IN
HTG
P.R.V.
Thermistor
Note 2
If heat exchanger
of indirect water
heater does not
have enough
mass, see
drawing 2-9
Thermistor
Note 2

Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B
8
Typical open loop piping is shown in Figure 2. Shut
off valves should be included in case of servicing.
Boiler drains or other valves should be ‘tee’d’ into the
line to allow acid ushing of just the heat exchanger.
Pressure temperature plugs should be used so that ow
and temperature can be measured. Piping materials
should be limited to PVC SCH80 or copper. 

Water quantity should be
plentiful and of good quality. Consult Table 2 for water
quality guidelines. The unit can be ordered with either
a copper or cupro-nickel water heat exchanger. Copper
is recommended for closed loop systems and open
loop ground water systems that are not high in mineral
content or corrosiveness. In conditions anticipating heavy
scale formation or in brackish water, a cupro-nickel heat
exchanger is recommended. In ground water situations
where scaling could be heavy or where biological growth
such as iron bacteria will be present, a closed loop
system is recommended. Heat exchanger coils may over
time lose heat exchange capabilities due to a build up of
mineral deposits inside. These can be cleaned only by a
qualied service mechanic as acid and special pumping
equipment are required.
Desuperheater coils can likewise become scaled and
possibly plugged. In areas with extremely hard water, the
homeowner should be informed that the heat exchanger
may require occasional acid ushing.

Use a closed, bladder-type expansion tank to minimize
mineral formation due to air exposure. The expansion tank
should be sized to handle at least one minute run time
of the pump to prevent premature pump failure using its
drawdown capacity rating. The pump should be sized to
the home’s domestic water load (5-9 gpm [19-34 l/m]) plus
the heat pump water load. Discharge water from the unit
is not contaminated in any manner and can be disposed
of in various ways depending on local building codes; i.e.
recharge well, storm sewer, drain eld, 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.

Note the placement of the water control valve. Always
maintain water pressure in the heat exchanger by placing
water control valves at the outlet of the unit to prevent
mineral precipitation. Pilot operated or Taco slow closing
valve’s solenoid valves are recommended to reduce water
hammer. If water hammer persists, a mini-expansion tank
can be mounted on the piping to help absorb the excess
hammer shock. Insure that the total ‘VA’ draw of the valve
can be supplied by the unit transformer. For instance the
Taco slow closing valve can draw up to 35VA. This can
overload smaller 40 or 50 VA transformers depending
on the other controls employed. A typical pilot operated
GROUND-WATER HEAT PUMP SYSTEMS
solenoid valve draws approximately 15VA. Note the
special wiring diagram of the AVM valve (Figure 9).
F
Flow regulation can be accomplished by two methods.
First, most water control valves have a built in ow
adjustment. By measuring the pressure drop through the
unit heat exchanger, ow rate can be determined and
compared to Table 7. Simply adjust the water control
valve until the desired ow is achieved. Secondly, a ow
control device may be installed. The devices are typically
an orice of plastic material that is designed to allow a
specied ow 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.

The water low temperature cutout setpoint should be
activated to avoid freeze damage to the unit. Consult the
low temperature cutout section of the controls description
for instructions.
� CAUTION! �
CAUTION! Refrigerant pressure activated water regulating
valves should never be used with ClimateMaster equipment.
� CAUTION! �
CAUTION! Many units installed with a factory or eld
supplied manual or electric shut-off valve. DAMAGE WILL
OCCUR if shut-off valve is closed during unit operation. A
high pressure switch must be installed on the heat pump side
of any eld provided shut-off valves and connected to the
heat pump controls in series with the built-in refrigerant circuit
high pressure switch to disable compressor operation if water
pressure exceeds pressure switch setting. The eld installed
high pressure switch shall have a cut-out pressure of 300
psig and a cut-in pressure of 250 psig. This pressure switch
can be ordered from ClimateMaster with a 1/4” internal are
connection as part number 39B0005N02.

Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B 9


GROUND-WATER HEAT PUMP SYSTEMS
THW
Source HX
(coaxial)
Load HX
IN OUT
NOTES:
1. P/T (pressure/temperature) ports are internal for THW
series units.
2. Other components (additional ball valves, unions, etc.)
may be required for ease of service. This drawing
shows only minimum requirements. Your specific
installation will dictate final component selections.
3. Local code supercedes any piping arrangements or
components shown on this drawing.
16Nov07
See drawings in Application manual for Load connections
P/T port
To proper discharge location
S
From pressure tank
Strainer (optional)
Shut-off valve
Boiler drain (for flushing)
Water control valve
High Pressure Switch
Flow regulator
Sound absorbing pad
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 150°F [66°C] HWG and
Direct well, 85°F [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
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) 100ϒF (38ϒC)
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 [1.8 m/s].
Filtered for maximum
800 micron [800mm,
20 mesh] size.
<10 ppm (<1 ppm "sandfree" for reinjection) of particlesand a maximum
velocity of 6 fps [1.8 m/s]. Filtered for maximum 800 micron [800mm,
20 mesh] size.Any particulate that is not removed can potentially
clog components.
Notes: Rev.: 03/28/08S
• 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 [66°C] for direct use and HWG applications,
and at 90°F [32°C] for indirect HX use. A monitoring plan should be implemented.

Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B
10
GROUND-LOOP HEAT PUMP APPLICATIONS

The typical closed loop ground source system is shown in
Figure 3. All earth loop piping materials should be limited
to only polyethylene fusion in inground sections of the
loop. Galvanized or steel tting should not be used at any
time due to their tendency to corrode. All plastic to metal
threaded ttings should be avoided due to their potential
to leak in earth coupled applications and a anged tting
substituted. P/T plugs should be used so that ow can
be measured using the pressure drop of the unit heat
exchanger in lieu of other ow measurement means.
Earth loop temperatures can range between 25-110°F
[-3.9 - 43.3°C]. 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 hydrostatic test pressure of at least 100 psi [689 kPa].

Once piping is completed between the unit, ow center
and the ground loop (Figure 3), nal purging and charging
of the loop is needed. A ush cart (at least a 1.5 hp [1.1
kW] pump) is needed to achieve adequate ow velocity in
the loop to purge air and dirt particles from the loop itself.
An antifreeze solution is used in most areas to prevent
freezing. All air and debris must be removed from the
earth loop piping system before operation. Flush the loop
with a high volume of water at a high velocity (2 fps [0.6
m/s] in all piping) both directions. The steps below must
be followed for proper ushing. Fill loop with water from
a garden hose through ush cart before using ush cart
pump to ensure an even ll. Once full, do not allow the
water level in the ush cart tank to drop below the pump
inlet line or air can be pumped back out to the earth loop.
Try to maintain a uid level in the tank above the return
tee so that air can not be continuously mixed back into the
uid. 50 psi [345 kPa] surges can be used to help purge
air pockets by simply shutting off the return valve going
into the ush cart reservoir. This ‘dead heads’ the pump to
50 psi [345 kPa]. To dead head the pump until maximum
pumping pressure is reached, open the valve back up
and a pressure surge will be sent through the loop to help
purge air pockets from the piping system. Notice the drop
in uid level in the ush cart tank. 


.
If the level drops more than this, ushing should continue
since air is still being compressed in the loop uid. Do this
a number of times.
When the uid level drops less than 1-2" [25-50mm] in
a 10" [254mm] diameter tank the ow can be reversed.
Finally the dead head test should be checked again for
an indication of air in the loop. 


100' of Pipe

Type Minimum Temperature for Low Temperature Protection
10°F [-12.2°C] 15°F [-9.4°C] 20°F [-6.7°C] 25°F [-3.9°C]
Methanol
100% USP food grade Propylene Glycol
Ethanol*
25%
38%
29%
21%
25%
25%
16%
22%
20%
10%
15%
14%
* Must not be denatured with any petroleum based product
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]

Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B 11

Antifreeze may be added before, during, or after the ushing
procedure. However, depending upon which time is chosen,
antifreeze could be wasted when emptying the ush cart
tank. See antifreeze section for more details. Loop static
pressure will uctuate with the seasons. Pressures will be
higher in the winter months than during the cooling season.
This uctuation 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 nal ush and
pressurize the loop to a static pressure of 40-50 psi [275-
345 kPa] (winter) 15-20 psi [100-138 kPa] (summer).
After pressurization, be sure to remove the plug in the
end of the Grundfos loop pump motor(s) to allow trapped
air to be discharged and to insure the motor housing has
been ooded. This is not required for Taco circulators.
Insure the loop ow center provides adequate ow
through the unit by checking pressure drop across the
heat exchanger and comparing it to the gures shown in
Table 7.

In areas where minimum entering loop temperatures drop
below 40°F [4.4°C] or where piping will be routed through
areas subject to freezing, antifreeze is needed. Alcohols
and glycols are commonly used as antifreezes, however
your local territory manager should be consulted for the
antifreeze best suited to your area. Freeze protection
should be maintained to 15°F [-9.4°C] below the lowest
expected entering loop temperature. For example, if
30°F [-1.1°C] is the minimum expected entering loop
temperature, the leaving loop temperature would be
25-22°F [-3.9 to -5.6°C] and freeze protection should be
at 15°F [-9.4°C] (30°F-15°F=15°F). All alcohols should
be premixed and pumped from a reservoir outside of the
building when possible or introduced under water level
to prevent fuming. Initially calculate the total volume of
uid in the piping system using Table 3. Then use the
percentage by volume shown in Table 4 for the amount of
antifreeze. Antifreeze concentration should be checked
from a well mixed sample using a hydrometer to measure
specic gravity.

When an antifreeze is selected the low temperature limit
setpoint should be switched to the lower setting to avoid
nuisance faults. Consult 
 in the controls section for more information.
GROUND-LOOP HEAT PUMP APPLICATIONS
To/From Ground Loop
THW
Source HX
(coaxial)
Load HX
IN OUT
NOTES:
1. P/T (pressure/temperature) ports are internal for THW
series units.
2. Source water piping must be insulated for closed loop
installations.
3. Other components (additional ball valves, unions, etc.)
may be required for ease of service. This drawing
shows only minimum requirements. Your specific
installation will dictate final component selections.
4. Local code supercedes any piping arrangements or
components shown on this drawing.
Flow Controller
02Nov07
See drawings in Application manual for Load connections
P/T port
Sound absorbing pad

Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B
12


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.

� WARNING! �
WARNING! To avoid possible injury or death due to
electrical shock, open the power supply disconnect switch
and secure it in an open position during installation.
� WARNING! �
� CAUTION! �
All eld 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 eld 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 nal electrical connections must be made with a
length of exible conduit to minimize vibration and sound
transmission to the building.

All 208-240 Volt units are factory wired for 240 Volt. The
transformers may be switched to 208V operation as
illustrated on the wiring diagram. By switching the Red
(208V) and the Orange (240V) at the terminal.
Model Voltage
Code Voltage Min/Max Voltage
Compressor Load
Pump
FLA
Source
Pump (1)
FLA
Source
Pump (2)
FLA
Total
Unit
FLA
Min
Circuit
Amps
Max
Fuse
HACR
Qty RLA LRA
THW008
T 200-220/50/1 190/242 1 18.9 94
- - - 18.9 23.6 40
0.8 - - 19.7 24.4 40
0.8 0.8 - 20.5 25.2 40
S 380-420/50/3 361/462 1 6.6 39
- - - 6.6 8.3 15
0.8 - - 7.4 9.1 15
0.8 0.8 - 8.2 9.9 15
THW010
T 200-220/50/1 190/242 1 24.7 121
- - - 24.7 30.9 50
0.8 - - 25.5 31.7 50
0.8 0.8 0.8 27.1 33.3 50
S 380-420/50/3 361/462 1 7.9 41
- - - 7.9 9.9 15
0.8 - - 8.7 10.7 15
0.8 0.8 0.8 10.3 12.3 20
G 208-230/60/1 197/254 1 20.7 81
- - - 20.7 25.9 45
1.07 - - 21.8 26.9 45
1.07 1.07 1.07 23.9 29.1 45
THW012 S 380-420/50/3 361/462 1 9.8 70
- - - 9.8 12.3 20
1.07 - - 10.9 13.3 20
1.07 1.07 1.07 13 15.5 25
THW Power Connection
Line voltage connection is made by connecting the
incoming line voltage wires to the power block as shown
in Figures 5 and 6. Consult Table 5 for correct fuse size.
Three Phase units require a neutral wire.
WARNING! To avoid possible injury or death due to electrical
shock, open the power supply disconnect switch and secure
it in an open position during installation.
CAUTION! Use only copper conductors for eld installed
electrical wiring. Unit terminals are not designed to accept
other types of conductors.

Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B 13



Field Low Voltage Wiring Field Line Voltage Wiring
Field Low Voltage Wiring Field Line Voltage Wiring

Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B
14

The thermistors (sensors) and other low voltage wiring
should be connected to the 12 position terminal strip in
the THW control box. See gures 5 and 6 for details.
Accessory Connections
A terminal paralleling the compressor contactor coil has
been provided on the CXM/DXM control of the THW unit.
"A" has been provided to control accessory devices,
such as water valves, electronic air cleaners, humidiers,
etc. 
 This signal
operates with the compressor contactor. See Figure 8 or
the wiring schematic for details.


Figures 9a and 9b illustrate a typical slow closing water
control valve wiring. A slow closing valve may be required
to prevent water hammer. When using an AVMB -Taco
Slow Closing valves on THW Series equipment Figure 9a
wiring should be utilized. The valve takes approximately
60 seconds to open (very little water will ow before 45
seconds) and it activates the compressor only after the
valve is completely opened (by closing its end switch).
Only relay or triac based electronic thermostats should
be used with the AVMB valve. When wired as shown, the
valve will operate properly with the following notations:

The CXM/DXM control allows the eld selection of source
uid low temperature cutout points. The factory setting of
FP1 is set for water (30°F [-1.1°C]). In cold temperature
applications jumper JW3 (FP1- antifreeze 10°F [-12.2°C])
should be clipped as shown in Figure 7 to change the
setting to 10°F [-12.2°C], a more suitable temperature when
using antifreezes.




1. The valve will remain open during a unit lockout.
2. The valve will draw approximately 25-35 VA through the
“Y” signal of the thermostat.
CXM
Board
JW3-FP1 jumper
should be clipped
when antifreeze
is used.

Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B 15
 � CAUTION! �
CAUTION! Many units are installed with a factory or eld
supplied manual or electric shut-off valve. DAMAGE WILL
OCCUR if shut-off valve is during unit operation. A
high pressure switch must be installed on the heat pump side
of any eld provided shut-off valves and connected to the
heat pump controls in series with the built-in refrigerant circuit
high pressure switch to disable compressor operation if water
pressure exceeds pressure switch setting. The eld installed
high pressure switch shall have a cut-out pressure of 235 psig
[1620 kPa] and a cut-in pressure of 190 psig [1310 kPa]. This
pressure switch can be ordered from ClimateMaster with a 1/4”
internal are connection as part number 39B0005N01.

� CAUTION! �
CAUTION! Refrigerant pressure activated water regulating
valves should never be used with ClimateMaster equipment.

R
CXM Board*
MPC*
Y
123
Y1
AVMB
Taco Valve
HeaterSwitch
*Valve must be wired in between the CXM and MPC boards. Remove the yellow
wire from the CXM board and connect it to terminal 2 on the valve. Add a new
wire from terminal 3 to the Y terminal at the CXM board, and a jumper wire from
terminal 1 to terminal R at the CXM board as shown above.
*Valve must be wired in between the CXM and MPC boards. Remove the yellow
wire from the CXM board and connect it to the w/y terminal on the valve. Add a
new wire from the end switch (bottom connection) to the the Y terminal at the
CXM board, and a jumper wire from the w/y terminal to the other side (top
connection) of the end switch as shown above.
Taco SBV Valve
Y1
MPC*
C
CXM
Board
Y*

Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B
16
ELECTRICAL - CONTROLS
Controls
User interface: Figure 10 shows the factory installed
and wired panel-mounted user interface for customizing
the MPC programming. A large dot-matrix style 2” x 2”
[5 x 5 cm] back-lit display is controlled by four arrow keys
and a select key. The main screen, as shown in gure
11, displays current outdoor and water temperatures, and
allows the user to change settings by selecting one of the
menus from the bottom of the screen (see gure 13 THW
User Interface Menu). A special installer set up mode
allows the technician to change some of the default MPC
parameters. The installer menu may only be accessed
when the unit is placed in the off mode. Holding the
up and down buttons at the same time will cause the
interface to enter the installer setup mode. See gure 14
(interface installer menu) The user interface includes a
time schedule for DHW generation, Fahrenheit/Celsius
selection, vacation mode for DHW, and other user
preference options.



The advantage of a programmable controller, as outlined
above, is the ability to integrate complex decision-
making tasks with the standard heat pump (CXM)
controls and communicate with a user interface. Below
is a list of standard features that are included in the THW
series controls.
Outdoor temperature reset: The heat pump capacity
and water temperature delivery to the heating system
must be designed for local weather conditions, usually
at the 99.6% outdoor temperature. Therefore, 99.6%
of the heating season, the heating load is less than it
is at design conditions. As the outdoor temperature
decreases, the heat loss of the structure increases,
which requires more capacity from the heating system.
If the water temperature is reduced as the outdoor air
temperature increases (and vise-versa), the heat pump
operates at higher COP most of the year. The MPC
has a built in algorithm that adjusts the buffer tank
temperature based upon outdoor air temperature to
maximize efciency and comfort. Temperature settings
may be adjusted at the user interface if factory defaults
are not sufcient.
The base setpoint for energizing the compressor in the
heating mode is determined by subtracting one-half the
heating differential value (HTD) from the buffer tank
heating temperature setpoint. The HTD is the differential
used for controlling setpoint. For example, if the buffer
tank setpoint is 100°F [38°C], and the HTD is 6°F [3°C],
the compressor will be energized at 97°F [36°C] and will
be turned off at 103°F [39°C]. The HTD is the difference
between the compressor “call” (97°F [36°C]) and the
“satised” (103°F [39°C]) temperature. The buffer
tank temperature may then be reduced by the outdoor
temperature reset function, depending on the current
outdoor air temperature (OAT) value. The valid range
for the buffer tank heating setpoint is 70-140°F [21-60°C],
with a default value of 100°F [38°C]. The valid range for
the heating differential value (HTD) is 4-20°F [2-11°C],
adjustable in 2°F [1°C] increments, with a default value of
6°F [3°C].
Arrow Keys
Select Key
� CAUTION! �
 Maximum leaving water temperature of the
THW series equipment is 145°F [63°C]. For domestic hot
water tank temperatures or heating buffer tank temperatures
above 130°F [54°C], pump and pipe sizing is critical to
insure that the ow rate through the heat pump is sufcient
to maintain leaving water temperatures below the maximum
temperature, and to provide water ow rates within the
ranges shown in the performance section of this manual.

Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B 17
ELECTRICAL - CONTROLS
There are four outdoor reset variables used for reducing
the buffer tank setpoint. The outdoor design temperature
(ODT) is the OAT above which setpoint reduction begins.
The valid range for ODT is –40°F to 50°F [-40°C to 10°C],
with a default value of 0°F [-18°C]. The maximum design
buffer tank temperature (MaxBT) is the maximum desired
buffer tank setpoint at the outdoor design temperature.
The valid range for MaxBT is 80-140°F [27-60°C], with
a default value of 130°F [54°C]. The building balance
point temperature (the temperature at which heating is
no longer needed) is the OAT at which maximum setpoint
(MaxBT) reduction will occur. The valid range for building
balance point is 50-70°F [10-21°C], with a default value of
60°F [16°F]. The minimum design water temperature is
the minimum desired buffer tank setpoint at the building
balance point temperature. The valid range for minimum
buffer tank temperature is 70°F-120°F [21-49°C], with
a default value of 70°F [21°C]. If an OAT sensor is not
detected (or if a thermistor error has occurred), the buffer
tank setpoint will not be reduced based on the OAT value
(i.e. the controller will use the buffer tank setpoint as
described in the previous paragraph).
Figure 12 shows an example outdoor temperature
reset curve for a climate that has an outdoor design
temperature of -4°F [-20°C]. At design temperature, the
radiant oor system needs 126°F [52°C] water. However,
when the outdoor temperature is 68°F [20°C], the home
needs no heating (building balance point). In between
-4°F and 68°F [-20°C and 20°C], the water temperature
in the buffer tank is adjusted accordingly. For homes
that are well insulated and tightly sealed, the building
balance point may be 55°F [13°C] or lower, so the slope
of the line changes based upon settings at the user
interface. The radiant oor design temperature will also
change the slope of the line. If tighter pipe spacing is
used, for example, the water temperature at the outdoor
design temperature may only be 100°F [38°C]. Again,
as the settings are changed at the user interface, the
slope of the line will change. As mentioned earlier, the
lower the heating water temperature at design conditions,
the higher the efciency (COP) of the heat pump. The
combination of a lower design temperature and outdoor
temperature reset can result in a signicant impact on
operating costs.
Outdoor Temperature Reset Example
10
15
20
25
30
35
40
45
50
55
30 25 20 15 10 5 0 -5 -10 -15 -20 -25 -30
Outdoor Temperature, °C [°F]
Buffer Tank Temperature, °C [°F]
[50]
[59]
[68]
[77]
[86]
[95]
[104]
[113]
[122]
[131]
[86] [77] [68] [59] [50] [41] [32] [23] [14] [5] [-4] [-13] [-22]
Maximum
Buffer Tank
Temperature
52C [126F]
20C [68F]
Minimum
Buffer Tank
Temperature
Building
Balance
Point
Temperature
Outdoor
Design
Temperature


Setting Description Range Default
Buffer Tank Set Point 70-140°F [21-60°C} 100°F [38°C]
Buffer Tank Deadband 4-20°F [2-11°C] 6°F [3°C]
Outdoor Design Temp -40-50°F [-40-10°C] 0°F [-18°C]
Maximum Design
Water Temp 80-140°F [27-60°C] 130°F [54°C]
Minimum Design
Water Temp 70-120°F [21-49°C] 70°F [21°C]
Building Balance
Point Temp 50-70°F [10-21°C] 60°F [16°C]
The maximum design water temperature must be equal the buffer tank
setpoint. The buffer tank setpoint will override the maximum design
temperature if they are entered with different values.

Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B
18
Warm weather shutdown (WWSD): Radiant oor systems
are the most comfortable type of heating available today.
However, they do have one disadvantage – quickly
switching from heating to cooling is not possible due to the
mass heat storage in the slab. For example, in the spring
or fall, there could be times where heating is required
at night, but cooling is required during the day. With a
warm oor, the cooling system has to work much harder
to cool the space. WWSD shuts down the water-to-water
heat pump at a pre-determined outdoor air temperature
(adjustable at the user interface). When a water-to-air heat
pump is used for space cooling, this unit can be enabled
when WWSD is activate, allowing the water-to-air heat
pump to heat via forced air during the shoulder seasons,
avoiding the warm slab/cooling dilemma (see cooling
enable, below). A normally closed contact is provided in
the THW unit to de-energize the heating system controls
(e.g. radiant oor control panel) during WWSD. WWSD
does not affect DHW heating. In other words, the water-to-
water unit can still operate for generating DHW, even if the
heating distribution (e.g. radiant oor) system is disabled.
The WWSD activation (i.e. when the WWSD feature
is enabled) outdoor air temperature range is 40-100°F
[4-38°C] with a default value of 70°F [21°C]. The
WWSD deactivation (i.e. when the radiant heating
returns to operating mode) temperature range is 35-
95°F [2-35°C] with a default value of 65°F [18°C] and a
minimum difference between activation and deactivation
temperatures of 5°F [3°C]. If the outdoor air temperature
(OAT) rises above the activation temperature, the cooling
enable signal (see below) is enabled, and the control no
longer controls the buffer tank temperature. If the OAT falls
below the deactivation temperature, the control resumes
monitoring the buffer tank temperature.
Cooling enable: Cooling enable is tied to the WWSD
feature. If desired, the water-to-air unit controls can be
wired to the THW unit controls, which will allow the water-
to-air unit to operate during WWSD, but will disable the
water-to-air unit when the THW unit is not in WWSD mode.
When a heat pump thermostat is connected to the water-
to-air unit, forced air heating may be used for the shoulder
seasons, allowing quick heating to cooling changeover. If
this feature is used, the consumer will easily be able to
tell when WWSD is enabled because the water-to-air unit
thermostat will only be active during WWSD. Otherwise,
the water-to-air unit thermostat will be disabled, indicating
that the consumer should utilize the hydronic heating (e.g.
radiant oor) thermostat.
Second stage heating (backup boiler): Optimal heat
pump sizing may not include a water-to-water heat pump
that can handle 100% of the heating load. When a
backup boiler is used to supplement the heating capacity,
a 24VAC output from the THW unit can energize the
boiler. The boiler control box simply needs a relay that
can be used to interface with the THW unit.
DHW priority: By default, DHW heating always takes
priority over space heating. Normally, the hot water load
will be satised quickly, and the unit can then switch back
to space heating.
Time schedule: DHW temperatures may be adjusted
during occupied/unoccupied times via the user interface
to save energy costs.
Vacation mode: DHW generation may be disabled
when the user interface is placed in vacation mode. A
return date and time may be set to restore normal DHW
temperatures.
Emergency DHW generation: If the THW unit is locked
out, a 24VAC signal can be sent to a contactor at the water
heater to allow the operation of the electric elements and
associated thermostat.
Enhanced heat pump lockouts: Like any ClimateMaster
unit, the CXM board locks out the compressor any
time a lockout condition occurs. The MPC reads the
lockouts from the CXM, and reports the condition to the
user interface. The user interface changes from a blue
backlight to a red backlight, indicating a lockout. The
actual lockout is reported (e.g. High Pressure) at the
interface. In addition to the standard CXM faults, the
MPC checks for bad thermistors and high compressor
discharge temperature, which are also reported at the
user interface.
Pump control: If the optional load and source pump(s)
are selected, the control energizes the pumps any time
the compressor is operating.
Variable speed oor pump (VSFP) output: Some radiant
oor systems utilize a variable speed pump on the oor
system, which changes ow based upon the number
of zones open or closed. Since the pump has built-in
controls, only a power supply is needed. An optional
power terminal is available for VSFP applications.
ELECTRICAL - CONTROLS

Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B 19
ELECTRICAL - CONTROLS

PROGRAM
MENU
MODE
MAIN MENU
SET DATE
AND TIME
OPERATING
MODE
TEMPERATURE
OFFSETS
PROGRAM
SETTINGS
DAYLIGHT
SAVINGS
SET MONTH,
DAY, YR, HR, MIN
VACATION
HOLD DATE
THEN TIME
SECURITY
LOCKOUT
TEMP ADJUST
LOCKOUT
TOTAL KEYPAD
LOCKOUT
SCREEN
SETTINGS
PROGRAM
SCREEN
SERVICE
INFORMATION
FAULT
STATUS
TEMPERATURE
STATUS
CLEAR FAULT
HISTORY
EVENTS
PER DAY
2ND STAGE
HEAT
WM. WEATHER
SHUTDOWN
CONTRAST
BACKLIGHT
F OR C
12 OR 24 HOUR
CLOCK
LANGUAGE
MAIN SCREEN
THW INTERFACE SCREEN HIERARCHY
FAULT
DESCRIPTION

Tranquility THW - 50 & 60Hz R410A - ClimateMaster Geothermal Heat Pumps - Rev.: 30 June, 2008B
20
INSTALLER
MENU
BUFFER TANK
SETPOINT
INPUT DEALER
INFORMATION
BUFFER TANK
DEADBAND
OUTDOOR
TEMPERATURE
RESET
RESTORE
DEFAULTS
MANUAL
OPERATION
HOT WATER
DEADBAND
OUTDOOR
DESIGN TEMP
THW INTERFACE INSTALLER MENU
MAXIMUM
WATER TEMP
MINIMUM WATER
TEMP
BALANCE POINT
TEMP

ELECTRICAL - CONTROLS