ClimateMaster Tranquility Water-to-Water THW 008 Owner's manual

Tranquility®
Water-to-Water
(THW) Series
Residential High
Temperature
Water-to-Water
Geothermal Heat Pumps
(Heating Only) - 50Hz
Installation, Operation
& Maintenance
97B0063N04
Revised: 02 January, 2013
Model Nomenclature 3
General Information 4
Physical Data 5
Dimensional Data 6
Installation 7
Load Plumbing Installation 7
Ground-Water Heat Pump Application 9
Water Quality Standards 10
Ground-Loop Heat Pump Application 11
Electrical - Line Voltage 13
Electrical - Low Voltage 15
Electrical - Controls 17
User Interface 20
Installer Interface 21
Wiring Diagram Matrix 22
Typical Wiring Diagrams 23
CXM Controls 31
Unit Commissioning
& Operating Conditions 33
Unit & System Checkout 34
Unit Start-Up Procedure 35
Preventive Maintenance 36
Warranty 37
Revision History 38
Table of Contents

CLIMATEMASTER WATER-SOURCE HEAT PUMPS
2ClimateMaster Water-Source Heat Pumps
Tranquility®Water-to-Water THW Series
Revised: 02 January, 2013
This Page Intentionally Left Blank

THE SMART SOLUTION FOR ENERGY EFFICIENCY
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Tranquility®Water-to-Water THW Series
Revised: 02 January, 2013
 WARNING! 
 WARNING! 
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: Notification of installation, operation, or
maintenance information, which is important, but which
is not hazard-related.
 WARNING! 
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 proficiency 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.
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.
TH W A0 0 8 QT 0 0 C S A S
1 2 3 4 5 6 7
8
9101112131415
TH = Tranquility High Temperature
Heating Only
Model Type
W = Water-To-Water
Configuration
Unit Size
008
010
Revision Level
A = Current
Voltage
Controls
0 = Residential Standard w/UltraQuiet
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
1 = 3-Way Valve
C = Load Pump & Source Pump(S)
W/Expansion Tanks
Q = Standard
V = Standard With VSFP
T
= 200-220/50/1 (THW008-010 Only)
S= 380-420/50/3 (THW012 Only)

CLIMATEMASTER WATER-SOURCE HEAT PUMPS
4ClimateMaster Water-Source Heat Pumps
Tranquility®Water-to-Water THW Series
Revised: 02 January, 2013
Inspection
Upon receipt of the equipment, carefully check the shipment
against the bill of lading. Make sure all units have been
received. Inspect the carton or crating of each unit, and
inspect each unit for damage. Assure the carrier makes
proper notation of any shortages or damage on all copies of
the freight bill and completes a common carrier inspection
report. Concealed damage not discovered during unloading
must be reported to the carrier within 15 days of receipt of
shipment. If not filed within 15 days, the freight company can
deny the claim without recourse. Note: It is the responsibility
of the purchaser to file all necessary claims with the carrier.
Notify the ClimateMaster Traffic Department of all damage
within fifteen (15) days of shipment.
Storage
Equipment should be stored in its shipping carton in a clean,
dry area. Store units in an upright position at all times. Stack
units a maximum of 3 units high.
Unit Protection
Cover units on the job site with either shipping cartons, vinyl
film, or an equivalent protective covering. Cap the open
ends of pipes stored on the job site. In areas where painting,
plastering, and/or spraying has not been completed, all due
precautions must be taken to avoid physical damage to the
units and contamination by foreign material. Physical damage
and contamination may prevent proper start-up and may
result in costly equipment clean-up.
Examine all pipes, fittings, and valves before installing any of
the system components. Remove any dirt or trash found in or
on these components.
Pre-Installation
Installation, Operation, and Maintenance instructions are
provided with each unit.. The installation site chosen should
include adequate service clearance around the unit. Before
unit start-up, read all manuals and become familiar with the
unit and its operation. Thoroughly check the system before
operation.
Prepare units for installation as follows:
1. Compare the electrical data on the unit nameplate with
ordering and shipping information to verify that the
correct unit has been shipped.
2. Keep the cabinet covered with the shipping carton until
installation is complete and all plastering, painting, etc.
is finished.
3. Verify refrigerant tubing is free of kinks or dents and that
it does not touch other unit components.
4. Inspect all electrical connections. Connections must be
clean and tight at the terminals.
5. Locate and verify any HWG or other accessory sensors
located in the compressor section.
 CAUTION! 
 CAUTION! 
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 significantly 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! 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.

THE SMART SOLUTION FOR ENERGY EFFICIENCY
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Tranquility®Water-to-Water THW Series
Revised: 02 January, 2013
Physical Data
Model 008 010 012
Compressor (qty) Scroll (1)
Factory Charge HFC-410A (kg) 2.51 2.50 2.84
Indoor/Load Water Connection Size
FPT (in) 1 1 1
Outdoor/Source Water Connection Size
FPT (in) 1 1 1
Domestic Hot Water Connection Size
FPT (in) 1 1 1
Weight - Operating, (kg) 207 207 234
Weight - Packaged, (kg) 214 214 241
Dual isolation compressor mounting
Balanced Port Expansion Valve (TXV)
Insulated Source and Load Water Coils
FPT - Female Pipe Thread
Maximum Working Pressure (Water Side)
Base Unit (kPa) 2068 2068 2068
DHW Option (kPa) 2068 2068 2068
Internal Source Pump
w/Expansion Tank (kPa) 310 310 310
Internal Load Pump
w/Expansion Tank (kPa) 310 310 310

CLIMATEMASTER WATER-SOURCE HEAT PUMPS
6ClimateMaster Water-Source Heat Pumps
Tranquility®Water-to-Water THW Series
Revised: 02 January, 2013
Dimensional Data
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 field service.
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 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 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 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
1.9” [4.9cm]
2.1” [5.3cm]
4.9 cm
5.3 cm

THE SMART SOLUTION FOR ENERGY EFFICIENCY
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Tranquility®Water-to-Water THW Series
Revised: 02 January, 2013
The applications are too varied to describe in this
document, however some basic guidelines will be
presented. All plumbing should conform to local codes
and consider the following:
Wide temperature variation applications such as
heating/cooling coils
- Employ piping materials that are rated for the
maximum temperature and pressure combination.
This excludes PVC for most heating applications.
- Insure load water flow in high temperature heating
applications is at least 3.2 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.
Swimming Pool Hot Tub Applications
- Recommended application includes a brazed plate
heat exchanger to isolate pool water from the unit
heat exchanger.
Potable Water Applications
- Insure load water flow in high temperature heating
applications is at least 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
Installation
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.
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.
Locate the unit in an indoor area that allows easy
removal of access panels, and has enough space for
service personnel to perform maintenance or repair.
Provide sufficient room to make water and electrical
connections. Any access panel screws that would be
difficult to remove after the unit is installed should be
removed prior to setting the unit. These units are not
approved for outdoor installation and, therefore, must
be installed inside the structure being conditioned.
Do not locate in areas where ambient conditions are
not maintained within 4-38°C and up to 75% relative
humidity.
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Load Piping Connections
Load piping connections are designated ‘Load Water In
and Out’ for the radiant heating system piping, and ‘DHW
Water In and Out’(optional) forconnection tothedomestic
hot water piping. Any unused piping connections on the
load side of the THW unit will allow spillage of the load
circuit fluid, as the radiant and DHW circuits are connected
internally.
If a unit is ordered with the DHW option and is not being
connected to a radiant heating system, the ‘Load Water
In and Out’ (radiant heating circuit) connections must be
connected to the ‘DHW In and Out’ piping using tees as
shown in Figure 1a. Failure to do so will lead to nuisance
high-pressure faults.
THW Unit Load Plumbing
Figure 1a: THW DHW Only Piping

CLIMATEMASTER WATER-SOURCE HEAT PUMPS
8ClimateMaster Water-Source Heat Pumps
Tranquility®Water-to-Water THW Series
Revised: 02 January, 2013
Load Plumbing Installation
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Figure 1b: THW Typical Load Piping

THE SMART SOLUTION FOR ENERGY EFFICIENCY
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climatemaster.com
Tranquility®Water-to-Water THW Series
Revised: 02 January, 2013
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 flushing of
just the heat exchanger. Pressure temperature plugs should
be used so that flow and temperature can be measured.
Piping materials should be limited to PVC SCH80 or copper.
Due to the pressure and temperature extremes, PVC SCH40
is not recommended. Water quantity should be plentiful and
of good quality. Consult Table 2 for water quality guidelines.
The unit can be ordered with either a copper or cupro-nickel
water heat exchanger. Copper is recommended for closed
loop systems and open loop ground water systems that are
not high in mineral content or corrosiveness. In conditions
anticipating heavy scale formation or in brackish water, a
cupro-nickel heat exchanger is recommended. In ground
water situations where scaling could be heavy or where
biological growth such as iron bacteria will be present, a
closed loop system is recommended. Heat exchanger coils
may over time lose heat exchange capabilities due to a build
up of mineral deposits inside. These can be cleaned only by
a qualified service mechanic as acid and special pumping
equipment are required.
Expansion Tank and Pump
Use a closed, bladder-type expansion tank to minimize mineral
formation due to air exposure. The expansion tank should be
sized to handle at least one minute run time of the pump to
prevent premature pump failure using its drawdown capacity
rating. The pump should be sized to the home’s domestic
water load 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 field, adjacent
stream or pond, etc. Most local codes forbid the use of
sanitary sewer for disposal. Consult your local building and
zoning department to assure compliance in your area.
Water Control Valve
Note the placement of the water control valve. Always
maintain water pressure in the heat exchanger by placing
water control valves at the outlet of the unit to prevent
mineral precipitation. Pilot operated or Taco slow closing
valve’s solenoid valves are recommended to reduce water
hammer. If water hammer persists, a mini-expansion tank can
be mounted on the piping to help absorb the excess hammer
shock. Insure that the total ‘VA’ draw of the valve can be
supplied by the unit transformer. For instance the Taco slow
closing valve can draw up to 35VA. This can overload smaller
40 or 50 VA transformers depending on the other controls
employed. A typical pilot operated solenoid valve draws
approximately 15VA. Note the special wiring diagram of the
AVM valve (Figure 9).
Flow Regulation
Flow regulation can be accomplished by two methods. First,
most water control valves have a built in flow adjustment.
By measuring the pressure drop through the unit heat
exchanger, flow rate can be determined and compared
to Table 8. Simply adjust the water control valve until the
desired flow is achieved. Secondly, a flow control device may
be installed. The devices are typically an orifice of plastic
material that is designed to allow a specified flow rate. These
are mounted on the outlet of the water control valve. On
occasion, these valves can produce a velocity noise that
can be reduced by applying some back pressure. This is
accomplished by slightly closing the leaving isolation valve of
the well water setup.
Low Temperature Cutout
The water low temperature cutout setpoint should be
activated to avoid freeze damage to the unit. Consult the low
temperature cutout section of the controls description for
instructions.
 CAUTION! 
CAUTION! Refrigerant pressure activated water regulating
valves should never be used with this equipment.
Ground-Water Heat Pump Systems

CLIMATEMASTER WATER-SOURCE HEAT PUMPS
10 ClimateMaster Water-Source Heat Pumps
Tranquility®Water-to-Water THW Series
Revised: 02 January, 2013
Table 2: Water Quality Standards
Figure 2: Typical Open Loop/ Well Application
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 Fe
2+
(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 (H
2
S) All
- <0.5 ppm
At H
2
S>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 pp m >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.: 3/22/2012
15Application not recommended.
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closed pressurized piping system.
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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. When water properties are outside of those
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.
THW
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.
Sound absorbing pad
Source HX
(coaxial)
IN OUT
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
Ground-Water Heat Pump Systems
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 CPVS 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.
 WARNING! 

THE SMART SOLUTION FOR ENERGY EFFICIENCY
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climatemaster.com
Tranquility®Water-to-Water THW Series
Revised: 02 January, 2013
Piping Installation
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 fitting should not be used at any
time due to their tendency to corrode. All plastic to metal
threaded fittings should be avoided due to their potential
to leak in earth coupled applications and a flanged fitting
substituted. P/T plugs should be used so that flow can
be measured using the pressure drop of the unit heat
exchanger in lieu of other flow measurement means.
Earth loop temperatures can range between -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 689 kPa.
Flushing the Earth Loop
Once piping is completed between the unit, flow
center and the ground loop (Figure 3), final purging
and charging of the loop is needed. A flush cart (at
least a 1.1 kW pump) is needed to achieve adequate
flow velocity in the loop to purge air and dirt particles
from the loop itself. An antifreeze solution is used in
most areas to prevent freezing. All air and debris must
be removed from the earth loop piping system before
operation. Flush the loop with a high volume of water
at a high velocity (0.6 m/s in all piping) both directions.
The steps below must be followed for proper flushing.
Fill loop with water from a garden hose through flush
cart before using flush cart pump to ensure an even
fill. Once full, do not allow the water level in the flush
cart tank to drop below the pump inlet line or air can
be pumped back out to the earth loop. Try to maintain
a fluid level in the tank above the return tee so that
air can not be continuously mixed back into the fluid.
345 kPa surges can be used to help purge air pockets
by simply shutting off the return valve going into the
flush cart reservoir. This ‘dead heads’ the pump to 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 fluid level in the flush cart tank. If air is purged
from the system, the level will drop only 25-50mm
in a 254mm diameter PVC flush tank since liquids
are incompressible. If the level drops more than
this, flushing should continue since air is still being
compressed in the loop fluid. Do this a number of
times.
When the fluid level drops less than 25-50mm in a
254mm diameter tank the flow can be reversed. Finally
the dead head test should be checked again for an
indication of air in the loop. This fluid level drop is
your only indication of air in the loop.
Table 3: Approximate Fluid Volume
Table 4: Antifreeze Percentages by Volume
Type Minimum Temperature for Low Temperature Protection
-12.2°C -9.4°C -6.7°C -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 (liters per 30 meters Pipe)
Pipe Size Volume (liters)
Copper
1” 15.3
1.25” 23.8
2.5” 34.3
Rubber Hose 1” 14.6
Polyethylene
3/4” IPS SDR11 10.4
1” iPS SDR11 16.7
1.25” IPS SDR11 29.8
1.5” IPS SDR11 40.7
2” IPS SDR11 67.0
1.25” IPS SCH40 30.9
1.5” IPS SCH40 40.7
2” IPS SCH40 63.4
Unit Heat Exchanger Typical 3.8
Flush Cart Tank [254mm x 91.4cm tall] 37.9
Ground-Loop Heat Pump Applications

CLIMATEMASTER WATER-SOURCE HEAT PUMPS
12 ClimateMaster Water-Source Heat Pumps
Tranquility®Water-to-Water THW Series
Revised: 02 January, 2013
Figure 3: Typical Earth Loop Connection.
Antifreeze may be added before, during, or after the
flushing procedure. However, depending upon which
time is chosen, antifreeze could be wasted when
emptying the flush cart tank. See antifreeze section
for more details. Loop static pressure will fluctuate
with the seasons. Pressures will be higher in the winter
months than during the cooling season. This fluctuation
is normal and should be considered when charging
the system initially. Run the unit in either heating or
cooling for a number of minutes to condition the loop
to a homogenous temperature. This is a good time for
tool cleanup, piping insulation etc. Then final flush and
pressurize the loop to a static pressure of 275-345 kPa
(winter) 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 flooded. This is not required for
Taco circulators. Insure the loop flow center provides
adequate flow through the unit by checking pressure
drop across the heat exchanger and comparing it to
the figures shown in Table 8.
Antifreeze
In areas where minimum entering loop temperatures
drop below 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 -9.4°C
below the lowest expected entering loop temperature.
All alcohols should be premixed and pumped from
a reservoir outside of the building when possible
or introduced under water level to prevent fuming.
Initially calculate the total volume of fluid in the piping
system using Table 3. Then use the percentage by
volume shown in Table 4 for the amount of antifreeze.
Antifreeze concentration should be checked from a
well mixed sample using a hydrometer to measure
specific gravity.
Low Water Temperature Cut-Out Setting
When an antifreeze is selected the low temperature
limit setpoint should be switched to the lower
setting to avoid nuisance faults. Consult Low Water
Temperature Cut-Out Setting in the controls section for
more information.
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Ground-Loop Heat Pump Applications
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 CPVS 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.
 WARNING! 

THE SMART SOLUTION FOR ENERGY EFFICIENCY
13
climatemaster.com
Tranquility®Water-to-Water THW Series
Revised: 02 January, 2013
Table 5: Electrical Data
CAUTION! Use only copper conductors for field installed
electrical wiring. Unit terminals are not designed to accept
other types of conductors.
 WARNING! 
 CAUTION! 
All field installed wiring, including electrical ground,
must comply with the National Electrical Code as well
as all applicable local codes.
Refer to the unit wiring diagrams for fuse sizes and a
schematic of the field connections which must be made
by the installing (or electrical) contractor.
Consult the unit wiring diagram located on the inside of
the compressor access panel to ensure proper electrical
hookup.
All final electrical connections must be made with a
length of flexible conduit to minimize vibration and
sound transmission to the building.
Control Transformer (Dual Voltage)
Confirm that power supply and transformer are compat-
ible and switch wiring as necessary.
Electrical - Line Voltage
WARNING! To avoid possible injury or death due to
electrical shock, open the power supply disconnect switch
and secure it in an open position during installation.
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
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
General Line Voltage Wiring
Be sure the available power is the same voltage and
phase as that shown on the unit serial plate. Line and
low voltage wiring must be done in accordance with
local codes or the National Electric Code, whichever is
applicable.
THW Power Connection
Line voltage connection is made by connecting the
incoming line voltage wires to the power block as
shown in Figure 5. Consult Table 5 for correct fuse size.

CLIMATEMASTER WATER-SOURCE HEAT PUMPS
14 ClimateMaster Water-Source Heat Pumps
Tranquility®Water-to-Water THW Series
Revised: 02 January, 2013
Electrical - Line Voltage
Field Low Voltage Wiring Field Line Voltage Wiring
Figure 4: THW 50Hz Line and Low Voltage

THE SMART SOLUTION FOR ENERGY EFFICIENCY
15
climatemaster.com
Tranquility®Water-to-Water THW Series
Revised: 02 January, 2013
Figure 7: Accessory Wiring
Figure 6: Changing FP1-Low Water Temperature
Cutout Setpoint
JW3-FP1 jumper
should be clipped
when antifreeze
is used.
CXM Board 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.
Electrical - Low Voltage
"A" has been provided to control accessory
devices, such as water valves, electronic air cleaners,
humidifiers, etc. Note: This terminal should be
used only with 24 Volt signals and not line voltage
signals. This signal operates with the compressor
contactor. See Figure 7 or the wiring schematic for
details.
Low Voltage Connections
The thermistors (sensors) and other low voltage wiring
should be connected to the 12 position terminal strip
in the THW control box. See figure 4 and unit wiring
diagram for details.
Low Water Temperature Cutout - FP1
The CXM/DXM control allows the field selection of
source fluid low temperature cutout points. The factory
setting of FP1 is set for water -1.1°C. In cold temperature
applications jumper JW3 (FP1- antifreeze -12.2°C) should
be clipped as shown in Figure 6 to change the setting
to -12.2°C, a more suitable temperature when using
antifreezes.
Accessory Connections
A terminal paralleling the compressor contactor coil
has been provided on the CXM/DXM control of the
THW unit.
Water Solenoid Valves
Figures 8 and 9 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 flow before 45 seconds) and it activates
the compressor only after the valve is completely
opened (by closing its end switch). Only relay or triac
based electronic thermostats should be used with
the AVMB valve. When wired as shown, the valve will
operate properly with the following notations:

CLIMATEMASTER WATER-SOURCE HEAT PUMPS
16 ClimateMaster Water-Source Heat Pumps
Tranquility®Water-to-Water THW Series
Revised: 02 January, 2013
Figure 8: Well Water AVMB Valve Wiring  CAUTION! 
CAUTION! Refrigerant pressure activated water regulating
valves should never be used with this equipment.
Figure 9: Taco SBV Valve Wiring
R
CXM Board*
MPC*
Y
1
2
3
Y1
AVMB
Taco Valve
Heater Switch
*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*
Electrical - Low Voltage

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Tranquility®Water-to-Water THW Series
Revised: 02 January, 2013
Arrow Keys
Select Key


 
6(37
 CAUTION! 
Electrical - Controls
CAUTION: Maximum leaving water temperature of the
THW series equipment is 63°C. For domestic hot water
tank temperatures or heating buffer tank temperatures
above 54°C, pump and pipe sizing is critical to insure
that the flow rate through the heat pump is sufficient to
maintain leaving water temperatures below the maximum
temperature, and to provide water flow rates within the
ranges shown in the performance section of this manual.
Controls
User interface: Figure 8 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 figure
9, 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
figure 11 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 figure 12 (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.
Figure 8: THW User Interface
Figure 9: THW User Interface Main Screen
THW Series Control Features
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 efficiency and comfort. Temperature settings
may be adjusted at the user interface if factory defaults
are not sufficient.
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 38°C, and the HTD is 3°C,
the compressor will be energized at 36°C and will be
turned off at 39°C. The HTD is the difference between
the compressor “call” 36°C and the “satisfied” 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 21-60°C, with a default value of 38°C. The
valid range for the heating differential value is 2-11°C,
adjustable in 1°C increments, with a default value of
3°C.

CLIMATEMASTER WATER-SOURCE HEAT PUMPS
18 ClimateMaster Water-Source Heat Pumps
Tranquility®Water-to-Water THW Series
Revised: 02 January, 2013
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
Buffer Tank Temperature, °C
Maximum
Buffer Tank
Temperature
52°C
20°C
Minimum
Buffer Tank
Temperature
Building
Balance
Point
Temperature
Outdoor
Design
Temperature
Figure 11: Example Outdoor Temperature Reset
Table 6: Buffer Tank Interface Inputs
Setting Description Range Default
Buffer Tank Set Point 21-60°C 38°C
Buffer Tank Deadband 2-11°C 3°C
Outdoor Design Temp -40-10°C -18°C
Maximum Design
Water Temp 27-60°C 54°C
Minimum Design
Water Temp 21-49°C 21°C
Building Balance
Point Temp 10-21°C 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.
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°C to 10°C, with a default value of -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 27-60°C, with a default value of 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 10-21°C,
with a default value of 16°C. 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
21-49°C, with a default value of 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 11 shows an example outdoor temperature
reset curve for a climate that has an outdoor design
temperature of -20°C. At design temperature, the
radiant floor system needs 52°C water. However, when
the outdoor temperature is 20°C, the home needs no
heating (building balance point). In between -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
13°C or lower, so the slope of the line changes based
upon settings at the user interface. The radiant floor
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 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
efficiency (COP) of the heat pump. The combination of
a lower design temperature and outdoor temperature
reset can result in a significant impact on operating
costs.

THE SMART SOLUTION FOR ENERGY EFFICIENCY
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Tranquility®Water-to-Water THW Series
Revised: 02 January, 2013
Electrical - Controls
Warm weather shutdown (WWSD): Radiant floor 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 floor, 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 floor 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 floor) system is disabled.
The WWSD activation (i.e. when the WWSD feature is
enabled) outdoor air temperature range is 4-38°C with
a default value of 21°C. The WWSD deactivation (i.e.
when the radiant heating returns to operating mode)
temperature range is 2-35°C with a default value of
18°C and a minimum difference between activation
and deactivation temperatures of 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 floor) 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 satisfied 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 floor pump (VSFP) output: Some radiant
floor systems utilize a variable speed pump on the floor
system, which changes flow 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.

CLIMATEMASTER WATER-SOURCE HEAT PUMPS
20 ClimateMaster Water-Source Heat Pumps
Tranquility®Water-to-Water THW Series
Revised: 02 January, 2013
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
FAULT
DESCRIPTION
Figure 12: THW User Interface Menu