Electrical Thermostat Wiring - ClimateMaster TRE Series Installation Operation & Maintenance

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
Figure 24a: Communicating Thermostat
back plate against the wall so that it appears level and
Connection to DXM2 Control
so the thermostat wires protrude through the middle
iGate Thermostat
®
of the back plate. Mark the position of the back plate
ATC32U03
mounting holes and drill holes with a 3/16" (5mm) bit.
Install supplied anchors and secure plate to the wall.
24Vac Common C Comm +
Thermostat wire must be 18 AWG wire. Representative
24Vac Hot R Comm -
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.
Figure 22a: Conventional 3 Heat / 2 Cool
Figure 24b: Conventional 3 Heat / 2 Cool Thermostat
Thermostat Connection to DXM2 Control
Connection to DXM2 Control
Thermostat
Y1
Compressor
Compressor Stage 2 Y2
Auxiliary Heat W
Dehumidification DH
Reversing Valve O
Fan G
24Vac Hot
R
24Vac Common C
Fault LED L
Notes:
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.
Field Wiring
Factory Wiring
T H E S M A R T S O L U T I O N F O R E N E R G Y E F F I C I E N C Y
DXM2
Gnd
A+
B-
B-
A+
24V
OD Outdoor
Sensor
(Optiona)
GND
Remote Indoor
ID
Sensor
(Optiona)
DXM2
Board
Y1
Y2
W
H
O
G
R
C
AL1
c l i m a t e m a s t e r . c o m
Electrical - Thermostat Wiring
Figure 22b: Communicating Thermostat Connection
Figure 24a: Communicating Thermostat
to DXM2 Control
Connection to DXM2 Control
iGate Thermostat
®
ATC32U03
24Vac Common C Comm +
Comm -
24Vac Hot R
Figure 24b: Conventional 3 Heat / 2 Cool Thermostat
Connection to DXM2 Control
Thermostat
Y1
Compressor
Compressor Stage 2
Y2
Auxiliary Heat W
Dehumidification DH
O
Reversing Valve
Fan G
24Vac Hot
R
24Vac Common C
Fault LED
L
Notes:
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.
Rooftop (TRE) Series
R e v. : O c t o b e r 7 , 2 0 1 9
DXM2
Gnd
A+
B-
B-
A+
24V
OD Outdoor
Sensor
(Optiona)
GND
Remote Indoor
ID
Sensor
(Optiona)
DXM2
Board
Y1
Y2
W
H
O
G
R
C
AL1
19