33-00462—05 14
Fig. 28. 3H/2C heat pump with electric aux heat
Fig. 29. Dual fuel 2H/1C heat pump
Whole house humidifier,
dehumidifier, or ventilator wiring
Using U Slider Tab
Fig. 30. Wired to humidifier, dehumidifier, or ventilator
with built-in transformer
M37821B
3H/2C HEAT PUMP WITH
ELECTRIC AUX HEAT.
1
COMMON REQUIRED.
L ONLY CONNECTED IF HEAT PUMP HAS A FAULT TERMINAL.
SOME HEAT PUMPS USE B RATHER THAN O FOR REVERSING VALVE.
DIFFERENT HEAT PUMP MODELS LABEL THE AUXILIARY HEAT TERMINAL
DIFFERENTLY THAN SHOWN. CONSULT HEAT PUMP WIRING GUIDE.
LOCKOUT OF AUX HEAT ON HIGH OUTDOOR TEMPERATURE CAN BE
DONE THROUGH ROUTER/INTERNET CONNECTION AND APP, WIRED
OUTDOOR SENSOR OR WIRELESS OUTDOOR SENSOR.
DO NOT CONNECT ANY WIRE TO W FOR HEAT PUMP APPLICATIONS!
THIS CAN CAUSE HEAT TO RUN CONTINUOUSLY.
MOST HEAT PUMPS SHARE THE SAME SET OF HEAT STRIPS FOR AUX AND
EM HEAT. IN THOSE CASES E ISN’T USED. IF SEPARATE AUX AND E WIRES
ARE USED, WIRE ONE SET OF STRIPS TO E TO BE ENERGIZED IN EM HEAT
AND A DIFFERENT SET OF STRIPS TO AUX TO BE ENERGIZED IN AUX HEAT.
S
S
Y
Y2
G
C
U
U
A
W2
W
K
Rc
R
L/A
E
AUX
HEAT PUMP/
AIR-HANDLER
R/Rc
SWITCH UP
O/B
1
2
3
4
5
6
7
3
4
7
6
5
R
AUX
L
Y
G
O
C
Y2
2
M37565C
DUAL FUEL
2H/1C HEAT PUMP
1
COMMON REQUIRED.
L ONLY CONNECTED IF HEAT PUMP HAS A FAULT TERMINAL.
SOME HEAT PUMPS USE B RATHER THAN O FOR REVERSING VALVE.
THE HEAT PUMP AND FURNACE HAVE SEPARATE BOARDS. WE SHOW
THEM TOGETHER TO SIMPLIFY THE DIAGRAM. W IS FROM THE
FURNACE BOARD.
BALANCE POINT LOCKOUT CAN BE DONE THROUGH ROUTER/
INTERNET CONNECTION AND APP, WIRED OUTDOOR SENSOR
OR WIRELESS OUTDOOR SENSOR.
DO NOT CONNECT ANY WIRE TO W FOR HEAT PUMP APPLICATIONS!
THIS CAN CAUSE HEAT TO RUN CONTINUOUSLY.
S
S
Y
Y2
G
C
U
U
A
W2
W
K
Rc
R
L/A
E
AUX
FURNACE/
HEAT PUMP
R/Rc
SWITCH UP
O/B
1
RW
L
G
C
O
Y
2
3
4
5
6
2
3
4
6
5
Humidifier,
dehumidifier,
or ventilator
M37823
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