34
G e o t h e r m a l H e a t i n g a n d Co o l i n g
Tranquility
®
22 Digital (TZ
)
Series - 60Hz
R e v. : N o v e m b e r 1 8 , 2 0 2 2
Electrical – Thermostat Wiring and Auxiliary Heat
AUXILIARY HEAT INSTALLATION
In both vertical and horizontal configurations, auxiliary
electric heater is installed externally to the unit.
For installation instructions, refer to the Electric Heat IOM,
97B0005N02.
Typical Vertical External Mount Installation
Auxiliary electric heat
power supply knockout
opposite air coil
Electric Heat Assembly
Air Coil
*
Low Voltage control
harness is prewired on
all distributor class units.
Transition bracket between
cabinet top and electric
heater shipped with
TZ036 and 042.
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 due to air infiltration through the
wall cavity. 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” (5 mm) bit. Install supplied anchors and secure plate
to the wall. Thermostat wire must be 18 AWG or larger wire.
Wire the appropriate thermostat as shown in Figures 26a
and 26b to the low voltage terminal strip on the DXM2.5
control board. Practically any heat pump thermostat will
work with these units, provided it has the correct number
of heating and cooling stages. However, using the iGate
®
2
Communicating (AWC) Thermostat is highly recommended
for on-site, easier configuration, monitoring and diagnosis.
Figure 26b: 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 26a: iGate
®
2 Communicating (AWC) 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+
⚠
CAUTION!
⚠
CAUTION!
Refrigerant pressure activated water regulating
valves should never be used with ClimateMaster equipment.
⚠
CAUTION!
⚠
CAUTION!
If communicating thermostat is not installed, a
communicating service tool must be used to configure and
diagnose this system.