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Rooftop (TRE) Series
Commercial Rooftop
Water-Source Heat Pumps
Installation, Operation
& Maintenance
97B0081N01
Rev.: October 7, 2019
Table of Contents
Model Nomenclature 3
General Information 4
TRE036 - 072 Dimensional Data 5
TRE096 - 144 Dimensional Data 6
TRE168 - 240 Dimensional Data 7
Standard Roof Curb 8
Standard Curb with Vibration Isolation 9
Side Discharge Supply & Return Roof Curb 10
Side Discharge Supply & Return Isolation Curb 11
Installation 12
Piping Installation 13
Water Quality Standards 14
Electrical Wiring 15
Electrical Low Voltage Wiring 16-17
Electrical Low Voltage Wiring non-vFlow 18
Electrical Thermostat Wiring 19
Electrical Data 20
TRE Electrical Data - ClimaDry
®
21
TWD - Units with MPC DDC Auxiliary Diagram 22
TWD - Units with LON DDC Auxiliary Diagram 23
TW - Units with Economizer Option 24
TWD - Single Compressor DXM2 25
TWD - Typical Two Compressor Unit/DXM2 26
TRE Series Nomenclature - ClimaDry
®
II Option 27
General Information 28-29
ClimaDry
®
II Sequence of Operation 30-31
TRE Blower Performance Data -
Units with ClimaDry
®
32
Flushing/Purging Units with ClimaDry
®
33
Unit Commissioning & Operating Conditions 34
Start-Up Preparation 35
Blower Adjustment 36
Tensioning V-Belt Drives 37
Unit System Checkout 38
Unit Start-up 39
Start-up Sheet Log 40
Preventive Maintenance 41
Warranty 42
Revision History 44
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Rooftop (TRE) Series
Rev.: October 7, 2019
2
ClimateMaster Water-Source Heat Pumps
This Page Intentionally Left Blank
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Rooftop (TRE) Series
Rev.: October 7, 2019
3
climatemaster.com
Model Nomenclature
Curb (TRE & ERV Unit Nomenclature)
T R E 0 3 6 HD 1D A A A A S
1 2 3 4 5 6 7 8
9
10 11 12 13 14 15
TRANQUILITY
®
ROOFTOP UNIT
SERIES
UNIT SIZE
REVISION LEVEL
VOLTAGE
CONTROLS
CABINET & FILTER
HEAT EXCHANGER OPTIONS
A = NONE
AIR DAMPER OPTIONS
A = NONE
POWER TERMINATION
B = DISCONNECT
C = DISCONNECT + GFI OUTLET
STANDARD
036
048
060
072
096
120
144
168
BLOWER DRIVE PACKAGE
D = DXM2
M = DXM2 w/LON
P = DXM2 w/MPC
B = MANUAL ADJUSTABLE FRESH AIR DAMPER
S = STANDARD
240
ETL APPROVED
USA & CANADA
A = STANDARD RPM & STANDARD MOTOR
B = LOW RPM & STANDARD MOTOR
C = HIGH RPM & STANDARD MOTOR
D = STANDARD RPM & LARGE MOTOR**
E = HIGH RPM & LARGE MOTOR**
D = CIRCUIT BREAKER
E = CIRCUIT BREAKER + GFI OUTLET
C = MOTORIZED FRESH AIR DAMPER
OPTION
RANGE
2”, (50mm) FILTER
MERV 8
4”, (50mm) FILTER
MERV 8
4”, (100mm) FILTER
MERV 13
THROWAWAY FILTER OPTIONS
1
B
C
3
D
E
EXTENDED
RANGE
STANDARD
RANGE
YES NO NO
NO YES NO
NO NO YES
YES NO NO
NO YES NO
NO NO YES
F = MODULATING ENTHALPY ECONOMIZER
A = HOT GAS BYPASS (on lead circuit only; std with
ClimaDry
®
option position 12)
B-Z = SPECIALS
NON-COATED AIR COILS
E-COATED AIR COILS
C
T
N
S
A
U
J
W
STANDARD
MOTORIZED VALVE
COPPER (CU)
COAX
CUPRO-NICKEL (CN)
COAX
E P D F
CLIMADRY
®
H Z G Y
INTERNAL
SECONDARY PUMP
*
COPPER (CU)
COAX
CUPRO-NICKEL (CN)
COAX
REHEAT COIL
3-WAY MOTORIZED VALVE
PROPORTIONAL CONTROL
CIRCULATING PUMP
PUMP CONTACTOR
HOT GAS BYPASS
DMX2 CONTROL
CLIMADRY
®
OPTION COMPONENTS
N = 575/60/3
D= CURRENT REVISION
F = 460/60/3
H = 208-230/60/3 (FACTORY WIRED 208)
A C U R B A A A A
1 2 3 4 5
9 10 11 12
Model Type
TRE 036 - 072 Standard Curb = AAA
CURB TYPE and/or Cabinet Size
Curb Constructions
B = Standard 24” High - TRE, ERD, ERS
D = 14” High Curb for ERO Stand Alone ERV
E = 24” High Curb for ERO Stand Alone ERV
C = Horizontal Discharge/RH & LH (TRE Only)
Field Changeable - Supply and Return
TRE 168 - 240 Standard Curb =
Stand Alone 300 - 1000 cfm B =
Stand Alone 1200 - 2800 cfm D =
Stand Alone 1200 - 2000 cfm C =
Stand Alone 2000 - 3600 cfm E =
Stand Alone 3000 - 4600 cfm F =
Stand Alone 4600 - 6200 cfm G =
Stand Alone 6000 - 8000 cfm H =
Stand Alone 8000 - 1200 cfm J =
AAC
EVB
EVD
EVE
EVF
EVG
EVH
EVJ
EVC
TRE 096 -144 Standard Curb = AAB
G
8
Revision Level
G = Current Revision
A = Standard 14” High - TRE, ERD, ERS
R T
6 7
ACURB = Curb
Series Type
RT =
EV =
TRE Series
Stand alone ERV Series
A
13
Curb Options
B = Welded
C = Welded Vibration Isolation (TRE only)
A = Knocked Down
S = Standard
N
14
Not Used
S
15
Standard
Note: Horizontal curb adapter for TRE only.
End return RH or LH supply, field changable.
Fits on top of digit 12 option A or B.
Digit 13 can be option A or C.
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Rooftop (TRE) Series
Rev.: October 7, 2019
4
ClimateMaster Water-Source Heat Pumps
WARNING! To avoid equipment damage, do not use these
units as a source of heat during the construction process.
The mechanical components and lters used in these units
will quickly become clogged with construction dirt and debris
which may cause system damage.
WARNING! Some units may be charged with refrigerants
other than 410A and are so labeled. Use appropriate
refrigerant handling techniques. Mixing refrigerants in units
is dangerous and can cause equipment damage. To avoid
the release of refrigerant into the atmosphere, the refrigerant
circuit of this unit must only be serviced by technicians who
meet local, state and federal prociency requirements.
5. Verify curb is proper size for unit. Install curb
according to manufacturer's instructions prior to
installing unit.
6. Properly size supply and return duct work.
Mount
supply air duct to curb before installing unit.
Inspection - Upon receipt of shipment at the job site,
carefully check the shipment against the bill of lading.
Make sure all units have been received. Inspect the car-
ton or crating housing of each Rooftop Unit and inspect
each unit for damage. Assure that the carrier makes
proper notation of any shortages or damage on all cop-
ies of the freight bill and that he completes a Carrier
Inspection Report. Concealed damage not discovered
during unloading must be reported to the carrier within
15 days of receipt of shipment. NOTE: It is the respon-
sibility of the purchaser to le all necessary claims
with the carrier.
Storage - Upon the arrival of equipment at the job site,
immediately store units in a clean, dry area. Store units
in an upright position at all times. Stack unit model
numbers TRE-036 through TRE-120 no more than 2
units high. Do not stack units larger than model number
TRE-120. Do not remove equipment from pallets until
equipment is required for installation
Unit Protection - Cover rooftop units on the job site.
Cap the open ends of pipes. In areas where painting,
plastering, roong, or the spraying of reproof material
has not been completed, all due precautions must be
taken to avoid physical damage to the units and con-
tamination by foreign material. Physical damage and
contamination may prevent proper start-up and may
result in costly equipment cleanup.
Pre-Installation - Installation, operation and maintenance
instructions are provided with each unit. Before unit
start-up, read all manuals and become familiar with the
unit and its operation. Thoroughly check out the system
before operation.
Prepare rooftop 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. Select an installation site on the roof which allows
adequate clearance for maintenance and servicing
of the unit. A minimum of two feet of clearance is
required on all service access and drain connection
sides of the unit.
3. Verify that refrigerant tubing is free of kinks or dents,
and that it has not been damaged during shipping.
4. Examine all pipes, ttings, valves and components
before installing the system. Remove any dirt found
on or in these components and assure that all
components are securely tted.
General Information
� WARNING! �
� WARNING! �
� CAUTION! �
CAUTION! Supply air duct is inaccessible from inside unit
once unit is installed.
Note: TRE model units with the ERV option may be
intended to be applied for 100% outdoor/make-up air
service. Additional heat pumps should be provided for
space conditioning if TRE/ERV is used for 100% OA. TRE/
ERV units may have insufcient capacity for both OA/MA
and space conditioning.
WARNING! The installation of water-source heat pumps 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.
� WARNING! �
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Rooftop (TRE) Series
Rev.: October 7, 2019
5
climatemaster.com
Optional
Rain
Hood
Optional
Rain
Hood
Pipe
Chase
Top View of Base
S
e
rvi
ce
Ac
ce
ss
3
.
5
’
(
1
.1
me
t
e
r
s)
S
e
r
v
i
ce A
c
c
e
ss
3
.
5
’ (
1
.
1
m
e
t
ers
)
Size
Outdoor Air Opening
Water In/Out (IPT)
TRE36 12.57" X 30" 3/4"
TRE48 12.57" X 30" 3/4"
TRE60 12.57" X 30" 1"
TRE72 12.57" X 30" 1 1/4"
Condensate
1"
1”
1”
1”
TRE036 - 072 Dimensional Data
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Rooftop (TRE) Series
Rev.: October 7, 2019
6
ClimateMaster Water-Source Heat Pumps
Top View of Base
Optional
Rain
Hood
Optional
Rain
Hood
S
e
rvi
ce
Ac
ce
ss
3
.
5
’
(
1
.1
me
t
e
r
s)
S
e
r
v
i
ce A
c
c
e
ss
3
.
5
’ (
1
.
1
m
e
t
ers
)
Size Outdoor Air Opening Water In/Out (IPT)
TRE96 18.95" X 36" 1 1/4"
TRE120 18.95" X 36" 1 1/2"
TRE144 18.95" X 36" 1 1/2"
Condensate
1"
1"
1"
Pipe
Chase
TRE096 - 144 Dimensional Data TRE168 - 240 Dimensional Data
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Rooftop (TRE) Series
Rev.: October 7, 2019
7
climatemaster.com
Pipe
Chase
Optional
Rain
Hood
Optional
Rain
Hood
S
e
r
v
i
c
e
A
c
c
e
s
s
3
.
5
’
(
1
.
1 me
t
e
r
s)
S
e
r
v
i
c
e
A
c
c
e
ss
3
.5’
(1.1
m
e
te
r
s
)
Top View of Base
Size Outdoor Air Opening Water In/Out
TRE168 18.95" X 74" 2"
TRE240 18.95" X 74" 2"
Condensate
1"
1"
TRE168 - 240 Dimensional Data
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Rooftop (TRE) Series
Rev.: October 7, 2019
8
ClimateMaster Water-Source Heat Pumps
Standard Roof Curb
Model A B C D E F*
TRE036/48/60/72
72.25” 18” 35.25”
72.25” 35.25” 14” or 24”
TRE096/120/144
82.25” 21” 41.25”
82.25” 41.25” 14” or 24”
TRE168/240
82.25” 21” 78.88”
82.25” 78.88” 14” or 24”
* “F” dimension can be 14” or 24”
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Rooftop (TRE) Series
Rev.: October 7, 2019
9
climatemaster.com
Standard Curb with Vibration Isolation
Model A B C D E F*
TRE036/48/60/72
72.25” 18” 35.25”
72.25” 35.25” 14” or 24”
TRE096/120/144
82.25” 21” 41.25”
82.25” 41.25” 14” or 24”
TRE168/240
82.25” 21” 78.88”
82.25” 78.88” 14” or 24”
* “F” dimension can be 14” or 24”
Note: Finish height is 12.5" taller than the base curb height.
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Rooftop (TRE) Series
Rev.: October 7, 2019
10
ClimateMaster Water-Source Heat Pumps
Side Discharge Supply & Return Roof Curb
Model A B C
TRE036/48/60/72
72.25” 18” 35.25”
TRE096/120/144
82.25” 21” 41.25”
TRE168/240
82.25” 21” 78.88”
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Rooftop (TRE) Series
Rev.: October 7, 2019
11
climatemaster.com
Side Discharge Supply & Return Isolation Curb
Model A B C
TRE036/48/60/72
72.25” 18” 35.25”
TRE096/120/144
82.25” 21” 41.25”
TRE168/240
82.25” 21” 78.88”
Note: Finish height is 12.5" taller than the base curb height.
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Rooftop (TRE) Series
Rev.: October 7, 2019
12
ClimateMaster Water-Source Heat Pumps
The installation of rooftop water-source heat pump units
and all associated components, parts and accessories
that make up the installation shall be in accordance with
the regulations of ALL authorities having jurisdiction
and MUST conform to all applicable codes. It is the
responsibility of the Installing Contractor to determine
and comply with ALL applicable codes and regulations.
Installation
Location, Access and Curb Installation -
Install curbs
with adequate clearance to allow unit maintenance and
servicing. Conform to the following guidelines when
selecting curb location.
1. Provide adequate clearance for lter replacement
and drain pan removal. Do not block lter access with
piping, conduit or other materials.
2. Provide access for fan and fan motor maintenance
and for servicing the compressor and coils without
removal of the unit.
3. Provide an unobstructed path to the unit to enable
removal of the unit if necessary.
4. Provide access to water valves and ttings, and
adequate access to the unit side panels and all
electrical connections.
Follow these guidelines when installing the curb.
1. Set unit on curb.
2. Align unit so that return air and supply air in the unit
match return and supply air opening in the curb frame.
3. Run supply and return loop piping and electrical
supply lines through the pipe chase provided in
the curb.
Note: Refer to previous pages for actual unit dimensions.
Figure 1: TRE Curb Installation
Gasket
Curb
TRE Series
Unit
Flashing
Roof
� CAUTION! �
CAUTION! 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.
When a compressor is removed from this unit, system
refrigerant circuit oil will remain in the compressor. To
avoid leakage of compressor oil, the refrigerant lines of the
compressor must be sealed after it is removed.
Mineral oil or equipment exposed to mineral oil (manifold
gauges, vacuum pumps or hoses) cannot be used to service
units charged with 410A refrigerant and P.O.E. oil. HFC-410A
and P.O.E. oil are extremely hygroscopic (they absorb water
from air). Only P.O.E. oil that has been veried as moisture
free can be added to the system. Consult factory for more
information.
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Rooftop (TRE) Series
Rev.: October 7, 2019
13
climatemaster.com
2”
1.5”
1.5”
* Some units include a painted drain connection.
Using a threaded pipe or similar device to clear
any excess paint accumulated inside this fitting
may ease final drain line installation.
1/8” Per
Foot
Condensate Piping -
Install a condensate trap at each
unit with the top of the trap positioned below the unit
condensate drain connection.
Design the length of the trap (water-seal) based upon
the amount of positive or negative pressure on the drain
pan. As a general rule, 1" of trap is required for each
1” of negative pressure on the unit with a 1.5” (38 mm)
minimum. Each unit must be installed with a dedicated
trap for that unit.
Note that condensate may be allowed to drain onto
the roof.
Supply and Return Piping
-
Follow these piping guidelines.
1. Install a drain valve at the base of each supply and
return riser to facilitate system ushing.
2. Install shut-off/balancing valves and unions at each
unit to permit unit removal of unit, if required.
3. Place strainers at the inlet of each system circulating
pump. To ensure a clean system.
Always insulate where the piping runs through unheated
areas or outside the building. If loop temperature is
maintained between 60°F and 90°F, piping will not
sweat nor lose heat under normal ambient conditions.
Otherwise, insulation is required on loop water piping.
All loop piping above grade must be insulated on any
unit connected to an open or closed GeoThermal loop
(GLHP, GWHP).
Pipe joint compound is not necessary when Teon
®
threaded tape is pre-applied to hose assemblies or when
ared-end connections are used. If pipe joint compound
is preferred, use compound only in small amounts on the
male pipe threads of the tting adapters. Prevent sealant
from reaching the ared surfaces of the joint.
Maximum allowable torque for brass ttings is 30 foot-
pounds. If a torque wrench is not available, tighten
nger-tight plus one quarter turn. Tighten steel ttings as
necessary.
Figure 2: Condensate Drain
� WARNING! �
WARNING! Piping must comply with all applicable Codes.
� CAUTION! �
CAUTION! Corrosive system water requires corrosion-
resistant ttings and hoses and may require water treatment.
Piping Installation
Note: The manufacturer strongly recommends all
piping connections, both internal and external to the
unit, be pressure tested by an appropriate method
prior to any nishing of the interior space or before
access to all connections is limited. Test pressure may
not exceed the maximum allowable pressure for the
unit and all components within the water system.
The manufacturer will not be responsible or liable
for damages from water leaks due to inadequate or
lack of a pressurized leak test, or damages caused
by exceeding the maximum pressure rating during
installation.
WARNING! Polyolester Oil, commonly known as POE oil, is
a synthetic oil used in many refrigeration systems including
those with HFC-410A refrigerant. POE oil, if it ever comes
in contact with PVC or CPVC piping, may cause failure of
the PVC/CPVC. PVC/CPVC piping should never be used
as supply or return water piping with water source heat
pump products containing HFC-410A as system failures and
property damage may result.
� WARNING! �
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Rooftop (TRE) Series
Rev.: October 7, 2019
14
ClimateMaster Water-Source Heat Pumps
Table 1: Water Quality Standards
Water Quality Standards
Water Quality
Parameter
HX
Material
Closed
Recirculating
Open Loop and Recirculating Well
Scaling Potential - Primary Measurement
pH/Calcium Hardness
All
-
pH < 7.5 and Ca Hardness <100ppm
Method
Index 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°C 24°C 38
C
Copper
Cupronickel
- <20ppm NR NR
- <150 ppm NR NR
304 S
S - <400 ppm <250 ppm <150 ppm
316 S
S - <1000 ppm <550 ppm < 375 ppm
Titanium - >1000 ppm >550 ppm >375 ppm
Erosion and Clogging
Particulate Size and
Erosion
All
<10 ppm of particles
and a maximum
velocity of 1.8 m/s
Filtered for maximum
841 micron [0.84 mm,
20 mesh] size.
<10 ppm (<1 ppm "sandfree” for reinjection) of particles and a maximum
velocity of 1.8 m/s. Filtered for maximum 841 micron 0.84 mm,
20 mesh] size. Any particulate that is not removed can potentially
clog components.
Notes:
• NR - Application not recommended.
• "-" No design Maximum.
• Closed Recirculating system is identified by a
closed pressurized piping system.
• Recirculating open wells should observe the open recirculating design considerations.
Above the given limits, scaling is likely to occur. Scaling indexes should be calculated using the limits below
Scaling indexes should be calculated at 66°C for direct use and HWG applications, and at 32°C for indirect HX use.
A monitoring plan should be implemented.
The ClimateMaster Water Quality Table provides water quality requirements for ClimateMaster coaxial heat exchangers. The water should be evaluated by an
independent testing facility comparing to this Table and when properties are outside of these requirements, an external secondary heat exchanger must be used to
isolate the heat pump heat exchanger from the unsuitable water. Failure to do so will void the warranty for the coaxial heat exchanger and any other components
damaged by a leak.
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Rooftop (TRE) Series
Rev.: October 7, 2019
15
climatemaster.com
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.
TRE Power Connection
- Line voltage connection is
made by connecting the incoming line voltage wires to
the power block. Line voltage conduit should be routed
through curb and unit pipe chase. Terminate conduit at
control/compressor deck.
208 Volt Operation
- All 208-240 Volt units are factory
wired for 208 Volt. The transformers may be switched to
240V operation as illustrated on the wiring diagram by
switching the Red (240V) and the Orange (208V) wires on
the transformer primary side. Unused wire terminal will be
“hot” and must be insulated and secured to prevent an
electric short.
Optional GFI Outlet requires dedicated 115V - 20 AMP
circuit provided by installer
� WARNING! �
WARNING! Disconnect electrical power source to prevent
injury or death from electrical shock.
� CAUTION! �
CAUTION! Use only copper conductors for eld installed
electrical wiring. Unit terminals are not designed to accept
other types of conductors.
Figure 2 illustrates a typical trap used with TRE Heat Pumps.
Multiple units within the same zone should be operated
from a common temperature control.
Thermostat Wiring -
All wiring must comply with all
applicable electrical codes including NEC and local
codes. Complete all wiring before units are installed.
Use multi conductor, color-coded, low-voltage cable
for all wiring. Refer to unit wiring diagram for required
thermostat connections.
Table 2: Recommended Thermostat Wire Sizes
* Length = physical length of wire from thermostat to unit.
� CAUTION! �
CAUTION! Maintain zone integrity to assure accurate and
efcient operational control of units or groups of units.
Without adequate zone control, adjacent units may operate in
heating and cooling mode simultaneously.
Electrical Wiring
WIRE SIZE MAX. WIRE LENGTH*
22 - Gauge 30 feet [9.14m]
20 - Gauge 50 feet [15.24m]
18 - Gauge 75 feet [22.86m]
16 - Gauge 125 feet [38.1m]
14 - Gauge 200 feet [60.96m]
Refer to Table 2 for wire sizes and lengths. Do not allow
the total resistance of all low-voltage wires used to exceed
1 ohm. Resistance in excess of 1 ohm may cause high
voltage drop which may result in control malfunction.
Refer to the thermostat installation and operation manual
to determine recommended heat anticipator settings.
When using a DDC building management system (BMS),
communication grade wire may be required. Verify
required communication and sensor wiring type with the
manufacturer of the BMS system components.
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Rooftop (TRE) Series
Rev.: October 7, 2019
16
ClimateMaster Water-Source Heat Pumps
Electrical - Low Voltage Wiring
Thermostat Connections - The thermostat will be wired
to the DXM2 board located within the unit control box.
Refer to the unit wiring diagram for specic details.
Low Water Temperature Cutout Selection - The DXM2
control allows the eld selection of low water (or water-
antifreeze solution) temperature limit by clipping jumper
JW3, which changes the sensing temperature associated
with thermistor LT1. Note that the LT1 thermistor is
located on the refrigeravnt line between the coaxial heat
exchanger and expansion device (TXV). Therefore, LT1 is
sensing refrigerant temperature, not water temperature,
which is a better indication of how water ow rate/
temperature is affecting the refrigeration circuit.
The factory setting for LT1 is for systems using water
(30°F [-1.1°C] refrigerant temperature). In low water
temperature (extended range) applications with
antifreeze (most ground loops), jumper JW3 should be
clipped as shown in Figure 17 to change the setting to
10°F [-12.2°C] refrigerant temperature, a more suitable
temperature when using an antifreeze solution. All
ClimateMaster units operating with entering water
temperatures below 60°F [15.6°C] must include the
optional water/refrigerant circuit insulation package to
prevent internal condensation.
Figure 17: LT1 Limit Setting
P1
Alarm
Relay
Comp
Relay
O
Y1
Y2
W
G
C
R
AL1
24Vdc
EH1
EH2
P6
R
C
Off On
JW3
A
OVR
ESD
C
R
NSB
AL2
JW1
Acc1
Relay
Acc2
Relay
H
COM
NC1
NO1
COM
NC2
NO2
P3
CO
RV
RV
LT1
LT1
LT2
LT2
LP
LP
HP
HP
P7
Status
Fault
R
R
CC
CCG
CO
S1
S2
1
12
1
4
Factory Use
(240Vac)
Com
N.O.
Fan Enable
5 1/2"
7"
6 1/2"
5"
Use 4 mounting screws
#6 sheet metal screw 1” long
1.5
3/8” standoff
Factory low
voltage Molex
connection for
unit harness
Factory low
voltage Molex
connection for
electric heat
harness
Micro
U1
Off On
P2
COH
COM
AO2
P11
Gnd
T1
P10
T2 T2 T3 T3 T4 T4
T5
P9
T5
T6 T6
A0-1 A0-2
Off On
S3
RV
Relay
CCH
Relay
Test
P5
B-
Gnd
P4
A+ 24V
(240Vac)
Fan Speed
N.O.
N.C.
12V
OUT
Gnd
P8
IN
NC
P12
Note: There is only
one T1 connection
1 2 3 4
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
AO1
Gnd
1
DXM2 PCB
JW3-LT1 jumper should be clipped for low temperature
(antifreeze) operation
Accessory Connections - A terminal paralleling the
compressor contactor coil has been provided on the DXM2
control. Terminal “A” is designed to control accessory
devices. Note: This terminal should be used only with 24
Volt signals and not line voltage. Terminal “A” is energized
with the compressor contactor.
The DXM2 controller includes two accessory relays ACC1
and ACC2. Each relay includes a normally open (NO) and
a normally closed (NC) contact. Accessory relays may be
congured to operate as shown in the tables below.
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Rooftop (TRE) Series
Rev.: October 7, 2019
17
climatemaster.com
Electrical - Low Voltage Wiring
Figure 18: Accessory Wiring
P2 Terminal Strip
Typical
Water
Valve
Accessory Relay 2 Conguration
Accessory Relay 1 Conguration
DIP 2.1 DIP 2.2 DIP 2.3 ACC1 Relay Option
ON ON ON Cycle with fan
OFF ON ON N/A for Residential Applications
ON OFF ON Water valve – Slow opening
ON ON OFF Outside air damper
OFF ON OFF ClimaDry option – Dehumidistat
OFF OFF OFF ClimaDry option – Humidistat
OFF OFF ON N/A for Residential Applications
ON OFF OFF N/A for Residential Applications
All other DIP combinations are invalid
DIP 2.4 DIP 2.5 DIP 2.6 ACC2 Relay Option
ON ON ON
Cycle with compressor
OFF ON ON
N/A for Residential Applications
ON OFF ON
Water valve – Slow opening
OFF OFF ON
Humidier
ON ON OFF
Outside air damper
All other DIP combinations are invalid
A slow closing valve may be required to help reduce
water hammer. Figure 18 shows typical wiring for a 24VAC
external solenoid valve. Figures 19 and 20 illustrate
typical slow closing water control valve wiring for Taco
500 series (ClimateMaster P/N AVM) and Taco SBV
series valves. Slow closing valves take approximately
60 seconds to open (very little water will ow before 45
seconds). Once fully open, an end switch allows the
compressor to be energized. Only relay or triac based
electronic thermostats should be used with slow closing
valves. When wired as shown, the slow closing valve will
operate properly with the following notations:
1. The valve will remain open during a unit lockout.
2. The valve will draw approximately 25-35 VA through
the “Y” signal of the thermostat.
Note: This valve can overheat the anticipator of an
electromechanical thermostat. Therefore, only relay or
triac based thermostats should be used.
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Rooftop (TRE) Series
Rev.: October 7, 2019
18
ClimateMaster Water-Source Heat Pumps
Electrical - Low Voltage Wiring for non-vFlow
®
Units Using External Motorized Water Valve
Figure 19: AVM Valve Wiring Figure 20: Taco SBV Valve Wiring
From Water Source
IN
OUT
NOTE: Shut-off valves, strainers and
other required components not shown.
Solenoid
Valve
Flow
Regulator
To Discharge
Stage 1
Stage 2
Figure 21: Two-Stage Piping
C
C
Termostato
Y
1
2
3
Y
AVM
Taco Válvula
Calentador Interruptor
Unidad Empacada
C
C
Aquastat
Y1
1
2
3
Y1
AVM
Taco Valve
Heater Switch
DXM2
Water Valve Wiring
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Rooftop (TRE) Series
Rev.: October 7, 2019
19
climatemaster.com
Thermostat Installation - The thermostat should be
located on an interior wall in a larger room, away from
supply duct drafts. DO NOT locate the thermostat in
areas subject to sunlight, drafts or on external walls.
The wire access hole behind the thermostat may in
certain cases need to be sealed to prevent erroneous
temperature measurement. Position the thermostat
back plate against the wall so that it appears level and
so the thermostat wires protrude through the middle
of the back plate. Mark the position of the back plate
mounting holes and drill holes with a 3/16” (5mm) bit.
Install supplied anchors and secure plate to the wall.
Thermostat wire must be 18 AWG wire. Representative
thermostat wiring is shown in Figures 22a-b however,
actual wiring connections should be determined from the
thermostat IOM and or unit wiring diagram. Practically
any heat pump thermostat will work with ClimateMaster
units, provided it has the correct number of heating and
cooling stages.
Electrical - Thermostat Wiring
Field Wiring
Factory Wiring
Figure 22a: Conventional 3 Heat / 2 Cool
Thermostat Connection to DXM2 Control
Thermostat
Connection to DXM2 Control
Compressor
Compressor Stage 2
Reversing Valve
Fan
24Vac Hot
24Vac Common
Fault LED
DXM2
Board
Y1
Y2
W
H
O
G
R
C
AL1
Y1
Y2
W
DH
O
G
R
C
L
iGate
®
Thermostat
ATC32U03
Figure 24a: Communicating Thermostat
24Vac Hot
DXM2
24V
Dehumidification
Notes:
Auxiliary Heat
1) ECM automatic dehumidification mode operates with dehumidification airflows
in the cooling mode when the dehumidification output from thermostat is active.
Normal heating and cooling airflows are not affected.
2) DXM2 board DIP switch S2-7 must be in the auto dehumidification mode for
automatic dehumidification.
3) DH connection not possible with units with internal variable speed pump. Use ATC32U03.
4) Only use ATC Communicating Thermostat when using Humidifier (H Input) in
units with internal variable speed pump.
Figure 24b: Conventional 3 Heat / 2 Cool Thermostat
Connection to DXM2 Control
Comm +
A+
Comm -
B-
B-
OD
ID
GND
Outdoor
Sensor
(Optiona)
Remote Indoor
Sensor
(Optiona)
24Vac Common
Gnd
R
C
A+
Figure 22b: Communicating Thermostat Connection
to
DXM2 Control
Thermostat
Connection to DXM2 Control
Compressor
Compressor Stage 2
Reversing Valve
Fan
24Vac Hot
24Vac Common
Fault LED
DXM2
Board
Y1
Y2
W
H
O
G
R
C
AL1
Y1
Y2
W
DH
O
G
R
C
L
iGate
®
Thermostat
ATC32U03
Figure 24a: Communicating Thermostat
24Vac Hot
DXM2
24V
Dehumidification
Notes:
Auxiliary Heat
1) ECM automatic dehumidification mode operates with dehumidification airflows
in the cooling mode when the dehumidification output from thermostat is active.
Normal heating and cooling airflows are not affected.
2) DXM2 board DIP switch S2-7 must be in the auto dehumidification mode for
automatic dehumidification.
3) DH connection not possible with units with internal variable speed pump. Use ATC32U03.
4) Only use ATC Communicating Thermostat when using Humidifier (H Input) in
units with internal variable speed pump.
Figure 24b: Conventional 3 Heat / 2 Cool Thermostat
Connection to DXM2 Control
Comm +
A+
Comm -
B-
B-
OD
ID
GND
Outdoor
Sensor
(Optiona)
Remote Indoor
Sensor
(Optiona)
24Vac Common
Gnd
R
C
A+
CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Rooftop (TRE) Series
Rev.: October 7, 2019
20
ClimateMaster Water-Source Heat Pumps
Electrical Data
Table 3: TRE Electrical Data
Model #
Voltage
Code
Voltage
Min/Max
Voltage
Blower
Option
Compressor Blower Motor
Total
FLA/
Rated
Current
SCCR kA
rms
symetrical
SCCR
Volts
Maximum
Min
Circuit
Amp
Max Fuse/
HACR
QTY RLA LRA QTY FLA HP
TRE036
H 208-3-60 197/254 A, B, C 1 10.4 73.0 1 4.0 1.0 14.4 N/A N/A 17.0 25
F 460-3-60 414/506 A, B, C 1 5.8 38.0 1 2.0 1.0 7.8 N/A N/A 9.3 15
N 575-3-60 518/633 A, B, C 1 3.8 36.5 1 1.4 1.0 5.2 N/A N/A 6.2 15
TRE048
H 208-3-60 197/254 A, B, C 1 13.7 83.1 1 4.0 1.0 17.7 N/A N/A 21.1 35
H 208-3-60 197/254 D, E 1 13.7 83.1 1 5.0 1.5 18.7 N/A N/A 22.1 35
F 460-3-60 414/506 A, B, C 1 6.2 41.0 1 2.0 1.0 8.2 N/A N/A 9.8 15
F 460-3-60 414/506 D, E 1 6.2 41.0 1 2.4 1.5 8.6 N/A N/A 10.2 15
N 575-3-60 518/633 A, B, C 1 4.8 33.0 1 1.4 1.0 6.2 N/A N/A 7.4 15
N 575-3-60 518/633 D, E 1 4.8 33.0 1 1.9 1.5 6.7 N/A N/A 7.9 15
TRE060
H 208-3-60 197/254 A, B, C 1 15.6 110.0 1 4.0 1.0 19.6 N/A N/A 23.5 35
H 208-3-60 197/254 D, E 1 15.6 110.0 1 5.0 1.5 20.6 N/A N/A 24.5 40
F 460-3-60 414/506 A, B, C 1 7.8 52.0 1 2.0 1.0 9.8 N/A N/A 11.8 15
F 460-3-60 414/506 D, E 1 7.8 52.0 1 2.4 1.5 10.2 N/A N/A 12.2 15
N 575-3-60 518/633 A, B, C 1 5.8 38.9 1 1.4 1.0 7.2 N/A N/A 8.7 15
N 575-3-60 518/633 D, E 1 5.8 38.9 1 1.9 1.5 7.7 N/A N/A 9.2 15
TRE072
H 208-3-60 197/254 A, B, C 1 19.6 136.0 1 5.0 1.5 24.6 N/A N/A 29.5 45
H 208-3-60 197/254 D, E 1 19.6 136.0 1 6.2 2.0 25.8 N/A N/A 30.7 50
F 460-3-60 414/506 A, B, C 1 8.2 66.1 1 2.4 1.5 10.6 N/A N/A 12.7 20
F 460-3-60 414/506 D, E 1 8.2 66.1 1 3.1 2.0 11.3 N/A N/A 13.4 20
N 575-3-60 518/633 A, B, C 1 6.6 55.3 1 1.9 1.5 8.5 N/A N/A 10.2 15
N 575-3-60 518/633 D, E 1 6.6 55.3 1 2.3 2.0 8.9 N/A N/A 10.6 15
TRE096
H 208-3-60 197/254 A, B, C 2 13.7 83.1 1 6.2 2.0 33.6 N/A N/A 37.0 50
H 208-3-60 197/254 D, E 2 13.7 83.1 1 9.2 3.0 36.6 N/A N/A 40.0 50
F 460-3-60 414/506 A, B, C 2 6.2 41.0 1 3.1 2.0 15.5 N/A N/A 17.0 20
F 460-3-60 414/506 D, E 2 6.2 41.0 1 4.3 3.0 16.7 N/A N/A 18.3 20
N 575-3-60 518/633 A, B, C 2 4.8 33.0 1 2.3 2.0 11.9 N/A N/A 13.1 15
N 575-3-60 518/633 D, E 2 4.8 33.0 1 3.4 3.0 13.0 N/A N/A 14.2 15
TRE120
H 208-3-60 197/254 A, B, C 2 15.6 110.0 1 9.2 3.0 40.4 N/A N/A 44.3 50
H 208-3-60 197/254 D, E 2 15.6 110.0 1 14.1 5.0 45.3 N/A N/A 49.2 60
F 460-3-60 414/506 A, B, C 2 7.8 52.0 1 4.3 3.0 19.9 N/A N/A 21.9 25
F 460-3-60 414/506 D, E 2 7.8 52.0 1 7.0 5.0 22.6 N/A N/A 24.6 30
N 575-3-60 518/633 A, B, C 2 5.8 38.9 1 3.4 3.0 15.0 N/A N/A 16.5 20
N 575-3-60 518/633 D, E 2 5.8 38.9 1 5.2 5.0 16.8 N/A N/A 18.3 20
TRE144
H 208-3-60 197/254 A, B, C 2 19.6 136.0 1 9.2 3.0 48.4 5 600 53.3 70
H 208-3-60 197/254 E 2 19.6 136.0 1 14.1 5.0 53.3 5 600 58.2 70
F 460-3-60 414/506 A, B, C 2 8.2 66.1 1 4.3 3.0 20.7 N/A N/A 22.8 30
F 460-3-60 414/506 E 2 8.2 66.1 1 7.0 5.0 23.4 N/A N/A 25.5 30
N 575-3-60 518/633 A, B, C 2 6.6 55.3 1 3.4 3.0 16.6 N/A N/A 18.3 20
N 575-3-60 518/633 E 2 6.6 55.3 1 5.2 5.0 18.4 N/A N/A 20.1 25
TRE168
H 208-3-60 197/254 A, B, C 2 23.2 164.0 1 9.2 3.0 55.6 5 600 61.4 80
H 208-3-60 197/254 D, E 2 23.2 164.0 1 14.1 5.0 60.5 5 600 66.3 80
F 460-3-60 414/506 A, B, C 2 11.2 75.0 1 4.3 3.0 26.7 N/A N/A 29.5 40
F 460-3-60 414/506 D, E 2 11.2 75.0 1 7.0 5.0 29.4 N/A N/A 32.2 40
N 575-3-60 518/633 A, B, C 2 7.9 54.0 1 3.4 3.0 19.2 N/A N/A 21.2 25
N 575-3-60 518/633 D, E 2 7.9 54.0 1 5.2 5.0 21.0 N/A N/A 23.0 30
TRE240
H 208-3-60 197/254 A, B, C 2 30.1 225.0 1 14.1 5.0 74.3 5 600 81.8 110
H 208-3-60 197/254 D, E 2 30.1 225.0 1 21.7 7.5 81.9 5 600 89.4 110
F 460-3-60 414/506 A, B, C 2 16.7 114.0 1 7.0 5.0 40.4 N/A N/A 44.6 60
F 460-3-60 414/506 D, E 2 16.7 114.0 1 10.0 7.5 43.4 N/A N/A 47.6 60
N 575-3-60 518/633 A, B, C 2 12.2 80.0 1 5.2 5.0 29.6 N/A N/A 32.7 40
N 575-3-60 518/633 D, E 2 12.2 80.0 1 7.8 7.5 32.2 N/A N/A 35.3 45
HACR circuit breaker in USA only
Note: Compressor RLA & LRA values are per compressor
/
