Nibe CLIMATEMASTER TRT Series Owner's manual

Rooftop
(TRT) Series
Commercial Rooftop
Water-Source
Heat Pumps
Installation, Operation
& Maintenance
97B0138N01
Revised: November 21, 2022
Table of Contents
Model Nomenclature 3
General Information 4
Dimensional Data 5
Standard Roof Curb 6
Installation 7
Piping Installation 8
Water Quality Requirements 9
Electrical – Wiring 13
Electrical – Low Voltage Wiring 14
Electrical – Thermostat Wiring 16
Sound Data 17
Electrical Data 18
Blower Motor VFD Controls 19
Wiring Diagram Matrix 21
Model Nomenclature – ClimaDry®II Option 22
ClimaDry®II – General Information 23
ClimaDry®II – Sequence of Operation 25
Blower Performance Data –
Units with ClimaDry®II 27
Flushing/Purging Units with ClimaDry®II 28
Operating and Commissioning Limits 29
Start-Up Preparation 30
Blower Adjustment 31
Tensioning V-Belt Drives 32
Unit System Checkout 33
Unit Start-up 34
Operating Temperatures and Pressures 35
Start-up Log Sheet 36
Preventive Maintenance 37
Warranty 38
Revision History 40

ClimateMaster Water-Source Heat Pumps
2
ClimateMaster WATER-SOURCE HEAT PUMPS
Rooftop (TRT)Series
Rev.: November 21, 2022
This Page Intentionally Left Blank

climatemaster.com 3
Rooftop (TRT)Series
Rev.: November 21, 2022
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Curb (TRT & ERV Unit Nomenclature)
ACURBA A A A
1 2 3 4 5 9 10 11 12
Model Type
TRE/TRT 036 - 072 Standard Curb = AAA
CURB TYPE and/or Cabinet Size
Curb Constructions
B = Standard 24” High - TRE, TRT, ERD, ERS
TRE/TRT 168 - 240 Standard Curb = AAC
TRE/TRT 096 -144 Standard Curb = AAB
H
8
Revision Level
H= Current Revision
A = Standard 14” High - TRE, TRT, ERD, ERS
R T
6 7
ACURB = Curb
Series Type
RT = TRE/TRT Series
A
13
Curb Options
A = Knocked Down
B = Welded
C = Welded Spring Isolation
A = Standard
S = Seismic/Wind Rated (non-calculated)
A = No Adapter
B = Horizontal Adapter
C = Horiz. Adapter w/14" Knockdown
D = Horiz. Adapter w/14" Welded
A
14
Horizontal Curb Adapter
S
15
Seismic / Wind Rated
Note: Horizontal curb adapter for TRE/TRT only.
End return RH or LH supply, field changable.
Fits on top of digit 12 option A or B.
0 3 6 HD 1C A A A A S
4 5 6 7 8
9
10 11 12 13 14 15
T R
1 2
T
3
TRANQUILITY®ROOFTOP UNIT
SERIES
T = DUAL STAGE COMPRESSOR
COMPRESSOR TYPE
036
048
060
072
UNIT SIZE
D = CURRENT ALL SIZES
REVISION LEVEL
G = 280-230/60/1
F = 460/60/3
H = 208-230/60/3 (FACTORY WIRED 208)
VOLTAGE
CONTROLS
D = DXM2.5
P = DXM2.5 w/MPC
ETL APPROVED
USA & CANADA
{
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
CABINET & FILTER
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
II
BLOWER DRIVE PACKAGE
F = VFD, VARIABLE FREQUENCY DRIVE
HEAT EXCHANGER OPTIONS
A = NONE
B = MANUAL ADJUSTABLE FRESH AIR DAMPER
C = MOTORIZED FRESH AIR DAMPER
F = MODULATING ENTHALPY ECONOMIZER
AIR DAMPER OPTIONS
POWER TERMINATION
A = NONE
B = DISCONNECT
C = DISCONNECT + GFI OUTLET
D = CIRCUIT BREAKER
E = CIRCUIT BREAKER + GFI OUTLET
STANDARD
S = STANDARD
A = HOT GAS BYPASS
B-Z = SPECIALS
1 2 3 4
MODULATING VALVE
REHEAT COIL
3-WAY MOTORIZED MODULATING
WATER VALVE
DXM2.5 CONTROL
CIRCULATING PUMP
PUMP CONTACTOR
HOT GAS BYPASS
CLIMADRY
®
II OPTION COMPONENTS
Model Nomenclature

ClimateMaster Water-Source Heat Pumps
4
ClimateMaster WATER-SOURCE HEAT PUMPS
Rooftop (TRT)Series
Rev.: November 21, 2022
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 prociency requirements.
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 carton 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 copies 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 responsibility 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. TRT units should be stacked no
more than 2 high. 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, roong, or the
spraying of reproof material 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
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.
⚠ WARNING! ⚠
⚠ WARNING! ⚠
⚠ CAUTION! ⚠
CAUTION! Supply air duct is inaccessible from inside unit
once unit is installed.
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! ⚠
General Information
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.
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.

climatemaster.com 5
Rooftop (TRT)Series
Rev.: November 21, 2022
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Optional
Rain
Hood
Ser
v
i
ce A
c
cess
3
.5’
(1.1
m
ete
r
s
)
Se
rvice
A
c
c
ess
3
.5
’
(1
.
1 m
et
ers
)
Optional
Rain
Hood
Top View
of Base
Pipe
Chase
Dimensional Data
Size Outdoor Air Opening Water In/Out (IPT) Condensate
TRT036 12.57” x 30” 3/4” 1”
TRT048 12.57” x 30” 3/4” 1”
TRT060 12.57” x 30” 1” 1”
TRT072 12.57” x 30” 1-1/4” 1”

ClimateMaster Water-Source Heat Pumps
6
ClimateMaster WATER-SOURCE HEAT PUMPS
Rooftop (TRT)Series
Rev.: November 21, 2022
Model A B C D E F*
TRT036/48/60/72 72.25” 18” 35.25” 72.25” 35.25” 14” or 24”
* “F” dimension can be 14” or 24”
Standard Roof Curb

climatemaster.com 7
Rooftop (TRT)Series
Rev.: November 21, 2022
THE SMART SOLUTION FOR ENERGY EFFICIENCY
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.
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: TRT Curb Installation
Gasket
Curb
TRT 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 veried as moisture
free can be added to the system. Consult factory for more
information.
Installation

ClimateMaster Water-Source Heat Pumps
8
ClimateMaster WATER-SOURCE HEAT PUMPS
Rooftop (TRT)Series
Rev.: November 21, 2022
⚠ 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.
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! ⚠
Piping Installation
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 Teon®
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.
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.
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.
Figure 2 illustrates a typical trap used with TRT Heat Pumps.
Figure 2: Condensate Drain
2”
1.5”
1.5”
1/8” Per
Foot

climatemaster.com 9
Rooftop (TRT)Series
Rev.: November 21, 2022
THE SMART SOLUTION FOR ENERGY EFFICIENCY
pH - Chilled Water 0.7F°58< to 9.0 7.0 to 9.0 7.0 to 9.0 7.0 to 9.0
pH - Heated Water 0.8F°58> to 10.0 8.0 to 10.0 8.0 to 10.0 8.0 to 10.0
Alkalinity
(
HCO3
)
ppm - CaCO
3
equiv. 50 to 500 50 to 500 50 to 500 50 to 500
Calcium (Ca)ppm <100 <100 <100 <100
Magnesium (Mg)ppm <100 <100 <100 <100
Total Hardness (CaCO3)ppm - CaCO3 equiv. 30 to 150 150 to 450 150 to 450 150 to 450
Langelier Satura�on Index LSI -0.5 to +0.5 -0.5 to +0.5 -0.5 to +0.5 -0.5 to +0.5
Ryznar Stability 5.6ISRxednI to 8.0 6.5 to 8.0 6.5 to 8.0 6.5 to 8.0
Total Dissolved Solids (TDS) ppm - CaCO
3
equiv. <1000 <1000 <1000 <1500
Sulfate (SO
4
2-
)ppm <200 <200 <200 <200
Nitrate(NO
3
-
)001<001<001<001<mpp
Chlorine (free)(Cl) ppm <0.5 <0.5 <0.5 <0.5
Chloride (water < 80°F) ppm <20 <20 <150 <150
Chloride (water > 120°F) ppm <20 <20 <125 <125
Hydrogen Sulfideα(H
2
S) 5.0<5.0<5.0<5.0<bpp
Carbon Dioxide (CO
2
)ppm 0 <50 10 to 50 10 to 50
Iron Oxide (Fe) ppm <1.0 <1.0 <1.0 <0.2
Manganese (Mn)ppm < 0.4 <0.4 <0.4 <0.4
Ammonia (NH
3
)ppm <0.05 <0.1 <0.1 <0.1
Chloramine (NH
2
CL) ppm 0 0 0 0
Iron 0000Lm/sllecairetcaB
Slime Forming 0000Lm/sllecairetcaB
Sulfate reducing 0000Lm/sllecairetcab
Suspended Solidsβ01<01<01<01<mpp)SST(
Earth Ground Resistanceχ0smhO Consult NEC & local electrical codes for grounding requirements
Electrolysis Voltageδ003<Vm Measure voltage internal water loop to HP ground
Leakage Currentδ51<Am Measure current in water loop pipe
Building Primary Electrical Ground to unit, must meet local diameter and penetra�on length requirements
CLIMATEMASTER WATER QUALITY REQUIREMENTS
For Closed-Loop and Open-Loop Systems
All Heat Exchanger
Types
COAXIAL HX Copper
Tube in Tube
COAXIAL HX
Cupronickel
Brazed Plate HX
316 SS
Symbol UnitsDescrip�on
Electrolysis
All HX types Scaling Poten�alCorrosion Preven�on
(Cl
-
)
Fouling &
Biological
Do not connect heat pump to steel pipe unless dissimilar materials are separated by using Di-electric unions. Galvanic corrosion of heat
pump water pipe will occur.
Heat Exchanger Type
Closed Loop
Recircula�ng Open Loop, Tower, Ground Source Well
-
Table 1: Water Quality Requirements
Clean water is essential to the performance and life span of water source heat pumps. Contaminants, chemicals, and
minerals all have the potential to cause damage to the water heat exchanger if not treated properly. All closed water loop
systems should undergo water quality testing and be maintained to the water quality requirements listed in this table.
Water Quality Requirements

ClimateMaster Water-Source Heat Pumps
10
ClimateMaster WATER-SOURCE HEAT PUMPS
Rooftop (TRT)Series
Rev.: November 21, 2022
1. The ClimateMaster Water Quality Table provides
water quality requirements for coaxial & brazed plate
heat exchangers.
2. The water must be evaluated by an independent
testing facility comparing site samples against
this Table. When water properties are outside of
these parameters, the water must either be treated
by a professional water treatment specialist to
bring the water quality within the boundaries of
this specication, or an external secondary heat
exchanger must be used to isolate the heat pump
water system from the unsuitable water. Failure to
do so will void the warranty of the heat pump system
and will limit liability for damage caused by leaks or
system failure.
3. Regular sampling, testing and treatment of the water
is necessary to assure that the water quality remains
within acceptable levels thereby allowing the heat
pump to operate at optimum levels.
4. If closed‐loop systems are turned off for extended
periods, water samples must be tested prior to
operating the system.
5. For optimal performance, it is recommended that the
closed‐loop piping systems are initially lled with de‐
ionized water.
6. Well water with chemistry outside of these
boundaries, and salt water or brackish water requires
an external secondary heat exchanger. Surface/Pond
water should not be used.
7. If water temperature is expected to fall below 40°F,
antifreeze is required. Refer to the heat pump IOM for
the correct solution ratios to prevent freezing.
αHydrogen Sulde has an odor of rotten eggs. If one
detects this smell, a test for H2S must be performed.
If H2S is detected above the limit indicated,
remediation is necessary (Consult with your Water
Testing/Treatment Professional) or a secondary heat
exchanger is required using appropriate materials as
recommended by the heat exchanger supplier.
βSuspended solids and particulates must be ltered
to prevent fouling and failure of heat exchangers.
Strainers or particulate lters must be installed to
provide a maximum particle size of 600 micron (0.60
mm, 0.023 in.) using a 20 to 30 mesh screen size.
When a loop is installed in areas with ne material
such as sand or clay, further ltration is required to a
maximum of 100 micron. Refer to the Strainer / Filter
Sizing Chart to capture the particle sizes encountered
on the site.
χAn electrical grounding system using a dedicated
ground rod meeting NEC and Local Electrical
codes must be installed. Building Ground must not
be connected the WSHP piping system or other
plumbing pipes.
δRefer to IOM for instructions on measuring resistance
and leakage currents within water loops.
Do not use PVC pipe for water loop (compressor POE
oil and glycols damage PVC) use of HDPE pipe is
recommended.
Strainer / Filter Sizing
Mesh Size Particle Size
Microns MM Inch
20 840 0.840 0.0340
30 533 0.533 0.0210
60 250 0.250 0.0100
100 149 0.149 0.0060
150 100 0.100 0.0040
200 74 0.074 0.0029
ppm = parts per million
ppb = parts per billion
Water Quality Requirements, Cont’d.

climatemaster.com 11
Rooftop (TRT)Series
Rev.: November 21, 2022
THE SMART SOLUTION FOR ENERGY EFFICIENCY
OHM meter
Measuring Earth Ground Resistance
0.02�
Building
Ground Rod
Well Casing
Measure the earth ground bond using an Ohm meter between the building's ground rod and the steel well casing.
The resistance measured should be zero Ohms. The NEC allows a resistance to ground up to 20 Ohms. Any
resistance above zero, indicates a poor earth ground which may be the result of a hot neutral line or that
conduc�ve water is present. Both of these may lead to electrolysis and corrosion of the heat pump piping. A check
for both should be performed and resolved.
Note if the well casing is plas�c, a conduc�ve path can be achieved by inser�ng a #6 AWG bare copper wire into the
well water. Remove the temporary conductor when finished.
Water Quality Requirements, Cont’d.

ClimateMaster Water-Source Heat Pumps
12
ClimateMaster WATER-SOURCE HEAT PUMPS
Rooftop (TRT)Series
Rev.: November 21, 2022
Measuring Electrolysis Voltage and Current
Volt Meter
300mV
Heat Pump
Wire Electrode inserted into port for
Voltage measurement
Pete's Port
HP Piping
Amp Sensor to VOM for Current
Water-in
Water-out
Measure the electrolysis voltage using a volt meter between the heat pump ground and a #14 AWG solid copper
wire electrode inserted into the water using a Pete’s style access port.
The HP must be opera�ng and the water stream flowing.
The voltage measured should be less than 300mV (0.300 V). If higher than 500mV electrolysis will occure and
corrosion will result.
If voltage is measured, the cause is a high resistance earth ground or current on the neutral conductor. Remedial
measures should be performed.
Measure the current flowing through the piping system by using an amp clamp probe on the water-in line. The HP
must be opera�ng and the water stream flowing.
There should be zero amps measured. If current is present, there is leakage current to the plumbing system and it
must be rec�fied to prevent pipe corrosion.
Water Quality Requirements, Cont’d.

climatemaster.com 13
Rooftop (TRT)Series
Rev.: November 21, 2022
THE SMART SOLUTION FOR ENERGY EFFICIENCY
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.
Table 2: Recommended Thermostat Wire Sizes
WIRE SIZE MAX. WIRE LENGTH*
22 - Gauge 30 feet [9.14 m]
20 - Gauge 50 feet [15.24 m]
18 - Gauge 75 feet [22.86 m]
16 - Gauge 125 feet [38.1 m]
14 - Gauge 200 feet [60.96 m]
* Length = physical length of wire from thermostat to unit.
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.
TRT 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.
⚠
CAUTION!
⚠
CAUTION! Use only copper conductors for eld installed
electrical wiring. Unit terminals are not designed to accept
other types of conductors.
Optional GFI Outlet requires dedicated 115V - 20 AMP
circuit provided by installer
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.
⚠ WARNING! ⚠
WARNING! Disconnect electrical power source to prevent
injury or death from electrical shock.
⚠ CAUTION! ⚠
CAUTION! Maintain zone integrity to assure accurate and
e󰀩cient operational control of units or groups of units.
Without adequate zone control, adjacent units may operate in
heating and cooling mode simultaneously.
Electrical – Wiring

ClimateMaster Water-Source Heat Pumps
14
ClimateMaster WATER-SOURCE HEAT PUMPS
Rooftop (TRT)Series
Rev.: November 21, 2022
Thermostat Connections
The thermostat will be wired to the DXM2.5 board located
within the unit control box. Refer to the unit wiring
diagram for specic details.
Low Water Temperature Cutout Selection
The DXM2.5 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 refrigerant 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 3 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 3: 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
DXM2.5 PCB
JW3-LT1 jumper should be clipped for
low temperature (antifreeze) operation
Electrical – Low Voltage Wiring
Accessory Connections
A terminal paralleling the compressor contactor coil
has been provided on the DXM2.5 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 DXM2.5 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 congured to operate as shown in the
tables below.
Accessory Relay 1 Conguration
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® II option – Dehumidistat
OFF OFF OFF ClimaDry® II option – Humidistat
OFF OFF ON N/A for Residential Applications
ON OFF OFF N/A for Residential Applications
All other DIP combinations are invalid
Accessory Relay 2 Conguration
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 Humidier
ON ON OFF Outside air damper
All other DIP combinations are invalid

climatemaster.com 15
Rooftop (TRT)Series
Rev.: November 21, 2022
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Figure 4: Accessory Wiring
P2 Terminal Strip
Typical
Water
Valve
A slow closing valve may be required to help reduce
water hammer. Figure 4 shows typical wiring for a
24VAC external solenoid valve. Figures 5 and 7 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.
Electrical – Low Voltage Wiring, Cont’d.
FOR NON-vFLOW®UNITS USING EXTERNAL
MOTORIZED WATER VALVE
Figure 5: Accessory Motorized Water Valve -
Typical Wiring Example #1
C
C
Termostato
Y
1
2
3
Y
AVM
Taco Válvula
Calentador Interruptor
Unidad Empacada
C
C
Aquastat
Y1
1
2
3
Y1
Accessory Motorized
Water Valve
Heater Switch
DXM2.5
Figure 6: Two-Stage Piping
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 7: Accessory Motorized Water Valve -
Typical Wiring Example #2
Capacitor
(Motor)
End Switch
c
w/y
LED
WATER VALVE
C
Y1
T-stat DXM2.5
C
Y1

ClimateMaster Water-Source Heat Pumps
16
ClimateMaster WATER-SOURCE HEAT PUMPS
Rooftop (TRT)Series
Rev.: November 21, 2022
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 inches (5 mm)
bit. Install supplied anchors and secure plate to the wall. Thermostat wire must be 18 AWG wire. Representative
thermostat wiring is shown in Figures 8a-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
Figure 8a: Conventional 3 Heat / 2 Cool Thermostat
Connection to DXM2.5 Control
Thermostat
Connection to DXM2.5 Control
Compressor
Compressor Stage 2
Reversing Valve
Fan
24Vac Hot
24Vac Common
Fault LED
DXM2.5
Board
Y1
Y2
W
DH
O
G
R
C
L
iGate®2 Communicating
(AWC) Thermostat
Figure 24a: Communicating Thermostat
24Vac Hot
DXM2.5
24V
Dehumidification
NOTES:
Y1
Y2
W
H
O
G
R
C
AL1
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) DXM2.5 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 iGate®2
Communicating (AWC) Thermostat.
4) Only use iGate® 2 Communicating (AWC) Thermostat when using Humidifier (H Input) in
units with internal variable speed pump.
Figure 24b: Conventional 3 Heat / 2 Cool Thermostat
Connection to DXM2.5 Control
Comm + A+
Comm - B-
B-
OD
ID
GND
Outdoor
Sensor
(Optional)
Remote Indoor
Sensor
(Optional)
24Vac Common
Gnd
R
C
A+
Figure 8b: Communicating Thermostat Connection
to DXM2.5 Control
Field Wiring
Factory Wiring
Thermostat
Connection to DXM2.5 Control
Compressor
Compressor Stage 2
Reversing Valve
Fan
24Vac Hot
24Vac Common
Fault LED
DXM2.5
Board
Y1
Y2
W
DH
O
G
R
C
L
iGate®2 Communicating
(AWC) Thermostat
Figure 24a: Communicating Thermostat
24Vac Hot
DXM2.5
24V
Dehumidification
NOTES:
Y1
Y2
W
H
O
G
R
C
AL1
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) DXM2.5 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 iGate®2
Communicating (AWC) Thermostat.
4) Only use iGate® 2 Communicating (AWC) Thermostat when using Humidifier (H Input) in
units with internal variable speed pump.
Figure 24b: Conventional 3 Heat / 2 Cool Thermostat
Connection to DXM2.5 Control
Comm + A+
Comm - B-
B-
OD
ID
GND
Outdoor
Sensor
(Optional)
Remote Indoor
Sensor
(Optional)
24Vac Common
Gnd
R
C
A+

climatemaster.com 17
Rooftop (TRT)Series
Rev.: November 21, 2022
THE SMART SOLUTION FOR ENERGY EFFICIENCY
Model Mode Ducted Discharge Octave Band Frequency, Hz. Free Air Inlet Combined With Casing (Cabinet)
Radiated, Octave Band Frequency, Hz.
125 250 500 1000 2000 4000 8000 125 250 500 1000 2000 4000 8000
TRT036
Fan Only 55 50 37 33 34 36 34 64 51 48 48 41 47 40
Cooling: Full Load 61 52 47 47 45 42 38 75 64 58 54 54 54 45
Heating: Full Load 61 52 47 47 45 40 37 75 63 58 55 52 50 47
Cooling: Part Load 53 49 34 34 37 38 36 69 65 55 58 57 54 43
Heating: Part Load 53 46 36 32 30 33 35 69 65 56 53 48 46 44
TRT048
Fan Only 49 41 35 31 28 33 36 61 52 49 45 42 48 42
Cooling: Full Load 59 54 50 47 48 47 42 72 65 62 59 55 56 49
Heating: Full Load 59 53 49 47 46 44 40 72 63 60 56 53 55 48
Cooling: Part Load 52 43 37 33 31 33 35 67 64 57 54 50 49 43
Heating: Part Load 54 44 37 32 28 32 36 67 59 54 46 43 48 41
TRT060
Fan Only 51 40 33 32 31 34 35 60 53 50 53 46 46 40
Cooling: Full Load 60 52 46 40 40 43 38 69 62 58 57 54 54 46
Heating: Full Load 60 51 44 41 40 42 37 69 63 62 57 54 52 45
Cooling: Part Load 52 43 34 33 33 35 35 63 59 53 52 46 47 42
Heating: Part Load 53 44 32 31 30 33 35 63 61 55 52 45 46 42
TRT072
Fan Only 52 40 36 31 30 34 36 62 54 51 50 44 48 42
Cooling: Full Load 64 54 52 46 47 49 49 72 65 68 60 58 61 53
Heating: Full Load 64 54 50 46 46 48 41 72 64 64 60 57 60 51
Cooling: Part Load 53 42 37 31 31 35 35 65 60 56 56 49 53 50
Heating: Part Load 53 40 37 31 30 34 36 65 64 55 56 49 52 49
Tested in accordance with ARI 260
TRT comes standard w/mute construction
TRT Series Octave Band Sound Power Level (dB re 1PW)
Standard 60 Hz Construction – Belt Drive Blower Motor + VFD
Sound Data

ClimateMaster Water-Source Heat Pumps
18
ClimateMaster WATER-SOURCE HEAT PUMPS
Rooftop (TRT)Series
Rev.: November 21, 2022
Model # Voltage
Code Voltage Min/Max Voltage
Blower
Option
Compressor Blower Motor VFD Rated
Current *
Min
Circuit
Amp
SCCR
kA rms
Symetrical
SCCR
Volts
Maximum
Max
Fuse/
HACR
QTY RLA LRA QTY FLA HP
TRT036
G 208-1-60 197/254 VFD
Only 1 15.3 83.0 1 11.4 1.0 26.7 30.5 5 600 45
H 208-3-60 197/254 VFD
Only 1 11.6 73.0 1 8.4 1.0 20.0 22.9 5 600 30
F 460-3-60 414/506 VFD
Only 1 5.7 38.0 1 4.1 1.0 9.8 11.2 5 600 15
TRT048
G 208-1-60 197/254 VFD
Only 1 21.2 104.0 1 16.1 1.5 37.3 42.6 5 600 60
H 208-3-60 197/254 VFD
Only 1 14.0 83.1 1 13.0 1.5 27.0 30.5 5 600 40
F 460-3-60 414/506 VFD
Only 1 6.4 41.0 1 6.0 1.5 12.4 14.0 5 600 20
TRT060
G 208-1-60 197/254 VFD
Only 1 27.1 152.9 1 16.1 1.5 43.2 50.0 5 600 70
H 208-3-60 197/254 VFD
Only 1 16.5 110.0 1 13.0 1.5 29.5 33.6 5 600 50
F 460-3-60 414/506 VFD
Only 1 7.2 52.0 1 6.0 1.5 13.2 15.0 5 600 20
TRT072
G 208-1-60 197/254 VFD
Only 1 29.7 179.2 1 16.8 2.0 46.5 53.9 5 600 80
H 208-3-60 197/254 VFD
Only 1 17.6 136.0 1 13.2 2.0 30.8 35.2 5 600 50
F 460-3-60 414/506 VFD
Only 1 8.5 66.1 1 6.9 2.0 15.4 17.5 5 600 25
* Verbiage change from Total FLA to Rated Current
Electrical Data
Electrical Data – Standard
Electrical Data – ClimaDry®II Reheat or Internal Secondary Pump
* Verbiage change from Total FLA to Rated Current
Model
#
Voltage
Code Voltage Min/Max Voltage
Blower
Option
Compressor Blower Motor
VFD Pump
Rated
Current *
Min
Circuit
Amp
SCCR
kA rms
Symetrical
SCCR
Volts
Maximum
Max
Fuse/
HACR
QTY
RLA LRA
QTY
FLA
HP
QTY
FLA
TRT036
G 208-3-60 197/254 VFD
Only 1 15.3 83.0 1 11.4 1.0 1 1.07 26.7 31.6 5 600 45
H 208-3-60 197/254 VFD
Only 1 11.6 73.0 1 8.4 1.0 1 1.07 20.0 24.0 5 600 30
F 460-3-60 414/506 VFD
Only 1 5.7 38.0 1 4.1 1.0 1 1.07 9.8 12.3 5 600 15
TRT048
G 208-3-60 197/254 VFD
Only 1 21.2 104.0 1 16.1 1.5 1 1.07 37.3 43.7 5 600 60
H 208-3-60 197/254 VFD
Only 1 14.0 83.1 1 13.0 1.5 1 1.07 27.0 31.6 5 600 40
F 460-3-60 414/506 VFD
Only 1 6.4 41.0 1 6.0 1.5 1 1.07 12.4 15.1 5 600 20
TRT060
G 208-3-60 197/254 VFD
Only 1 27.1 152.9 1 16.1 1.5 1 1.07 43.2 51.0 5 600 70
H 208-3-60 197/254 VFD
Only 1 16.5 110.0 1 13.0 1.5 1 1.07 29.5 34.7 5 600 50
F 460-3-60 414/506 VFD
Only 1 7.2 52.0 1 6.0 1.5 1 1.07 13.2 16.1 5 600 20
TRT072
G 208-3-60 197/254 VFD
Only 1 29.7 179.2 1 16.8 2.0 1 1.07 46.5 55.0 5 600 80
H 208-3-60 197/254 VFD
Only 1 17.6 136.0 1 13.2 2.0 1 1.07 30.8 36.3 5 600 50
F 460-3-60 414/506 VFD
Only 1 8.5 66.1 1 6.9 2.0 1 1.07 15.4 18.6 5 600 25

climatemaster.com 19
Rooftop (TRT)Series
Rev.: November 21, 2022
THE SMART SOLUTION FOR ENERGY EFFICIENCY
VFD Blower Description
Variable Frequency Drives are controllers that vary electrical
frequency and voltage to the fan motor. Electrical frequency
is directly related to a fan motors speed (RPM’s). The faster
the frequency, the faster the motor will go and vice versa.
VFD’s allow the fan motor to ramp speed (CFM) up or
down to match the load of the space they are satisfying.
This allows theTRT product to deliver variable capacity,
optimizing system efciency and saving owners money.
VFD controllers come factory installed and tested to
provide supply fan motor speed modulation. VFDs on
the supply fan, are quieter, more efcient, and are eligible
for utility rebates. These products are commonly used
in single zone variable air volume (VAV) applications.
When applied to single zone VAV applications the system
modulates the indoor fan and stages the compressor
as space temperature changes, for increased part-load
efciency and more precise temperature control with
fan speed varying down to 60% of maximum air ow.
The VFD controls are paired with our intelligent DXM2.5
controls to provide superior service and functionality.
VFD Blower Sequence of Operation
The VFD blower option comes factory programmed with
DXM2.5 controls. The DXM2.5 controls the VFD blower
controller using a 0–10 VDC control signal, and comes
factory programed for Leaving Air Temperature (LAT)
control mode. When the VFD is off, the output should be
set to 0 VDC. For each unit size, there will be a maximum
and minimum operating speed that the VFD can be
operated at for any mode, dened in VFD Operational
Table 3.1.
The VFD blower may be operated in LAT or discrete speed
control modes.
NOTE: VFD output is 50% of last value during
heating or cooling blower off delay times.
LAT Control VFD Operation
The DXM2.5 will come factory congured for LAT control
operation. The VFD speed will be controlled by the
DXM2.5 to maintain the factory default LAT set point, 55°F
for cooling and 105°F for heating. LAT can be adjusted in
the eld. See VFD Operational Table 3.1 for full details.
When a compressor demand is recognized, the VFD
output will be set to the most recent operating speed
of the VFD in the current operating mode (heating or
cooling). If there is no value stored from a previous heating
or cooling cycle, the VFD speed will initially set at 75%
or 8.0 VDC. After the VFD speed is initially set, the VFD
control signal will not be adjusted until after 90 seconds
of compressor operation, and then will be periodically
checked and adjusted every 10 seconds if needed to
maintain the LAT.
If the control switches from the heating mode to cooling, or
cooling to heating without de-activating the compressor,
the VFD control voltage will immediately switch to the
last stored control voltage for the new operating mode,
and then will not be adjusted for the rst 90 seconds of
operation in the new operating mode.
The VFD control voltage is increased or decreased
incrementally based on the magnitude of the differential
between the current LAT and the target LAT dened in
VFD Operational Table 3.2.
Discrete Speed VFD Operation
When the DXM2.5 is congured for discrete speed VFD
operation, the VFD speed will be set to the selected
operating speed (A, B or C) for full load heating or cooling.
Full load operation is dened as second stage or higher
heating or cooling.
When the DXM2.5 is congured for discrete speed VFD
operation, the VFD operating speed may be increased or
decreased by 10%, if the appropriate speed adjustment
ag is set in the VFD conguration ags. If the increase
and decrease ags are both set, there will be no
adjustment from the normal value.
When operating in rst stage heating or cooling, the VFD
speed will be set to the percentage of the selected full
load operating speed (A, B or C, plus or minus adjustment)
listed for each unit size as dened in VFD Operational
Table 3.3.
Blower Motor Variable Frequency Drive (VFD)Controls

ClimateMaster Water-Source Heat Pumps
20
ClimateMaster WATER-SOURCE HEAT PUMPS
Rooftop (TRT)Series
Rev.: November 21, 2022
LAT di󰀨erential
|Actual – Target|
VFD adjust
(VDC)
∆T ≤ 1.0°F 0.0
1.0 < ∆T ≤ 2.0°F 0.1
2.0 < ∆T ≤ 3.0°F 0.2
3.0 < ∆T ≤ 5.0°F 0.3
∆T > 5.0°F 0.4
VFD Operational Table 3.2
HP
Family
Unit
Size
Minimum
VFD
Speed
Maximum
VFD
Speed
VFD
Fixed
Speed A
VFD
Fixed
Speed B
VFD
Fixed
Speed C
Part Load
Multiplier
Default
Fan Speed
TRT
36 3.6 9.9 6.9 5.8 8.9 75% 4.8
48 4.5 9.5 7.5 7 8.5 75% 6
60 4.3 9.8 7.3 6.7 8.8 75% 5.7
72 3.9 9.9 7.2 6.2 8.9 75% 5.2
NOTE: All speed values are voltages from 0-10VDC
VFD Operational Table 3.3
HP
Family
Unit
Size
Minimum
Heat LAT
Maximum
Heat LAT
Default
Heat LAT
Minimum
Cool LAT
Maximum
Cool LAT
Default
Cool LAT
TRT
36 85° 125° 105° 45° 65° 55°
48 85° 125° 105° 45° 65° 55°
60 85° 125° 105° 45° 65° 55°
72 85° 125° 105° 45° 65° 55°
VFD Operational Table 3.1
Blower Motor Variable Frequency Drive (VFD) Controls, Cont’d.