Wiring heat pump systems
Shaded areas below apply only to
1H/1C Heat Pump
System
Rc
Power
[1]
R
[R+Rc joined by jumper]
Y
Compressor contactor
C
24VAC common
O/B
Changeover valve
G
Fan relay
2H/1C Heat Pump
System (TH5220D only)
Rc
Power
[1]
R
[R+Rc joined by jumper]
Y
Compressor contactor
C
24VAC common
O/B
Changeover valve
G
Fan relay
Aux/E
Auxiliary/Emergency heat relay
L
Sends output when set to Em. Heat
2H/1C Heat Pump
System
(TH5320U only)
[8]
Rc
Power
[1]
R
[R+Rc joined by jumper]
Y
Compressor contactor
C
24VAC common
O/B
Changeover valve
G
Fan relay
Aux/E
Auxiliary/Emergency heat relay
L
Sends output when set to Em. Heat
Thermostat mounting
1. Push excess wire back into the
wall opening.
2. Plug wall opening with non-
flammable insulation.
3. Align the 4 tabs on the wallplate
with corresponding slots on the
back of the thermostat.
4. Push gently until the thermostat
snaps in place.
TH5320U/TH5220D
G
C
Y
R
M29381
[3]
[7]
[8]
L
Aux
G
C
Y
R
E
[3]
[7]
[11]
L
Aux
G
C
Y
R
E
[3]
[7]
[11]
2H/2C Heat Pump
System
Rc
(TH5320U only)
Rc
Power
R
[R+Rc joined by jumper]
Y
Compressor contactor (stage 1)
C
24VAC common
O/B
Changeover valve
G
Fan relay
Y2
Compressor contactor (stage 2)
Rc
L
Sends output when set to Em. Heat
3H/2C Heat Pump
System
(TH5320U only)
Rc
Power
R
[R+Rc joined by jumper]
Y
Compressor contactor (stage 1)
C
24VAC common
O/B
Changeover valve
G
Fan relay
Rc
Aux/E
Auxiliary/Emergency heat relay
Y2
Compressor contactor (stage 2)
L
Sends output when set to Em. Heat
See Notes on page 3.
4
or as otherwise noted.
L
Y2
G
[9]
[1]
[3]
[7]
L
Y2
Aux
G
[10]
E
[1]
[3]
[7]
C
Y
R
Rc
[11]
C
Y
R
Rc
[11]
M29386