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TM
TH5110 / TH5220 / TH5320
Wiring
Wiring guide — heat pump systems
Shaded areas below apply only to TH5320U/TH5220D or as otherwise noted.
Thermostat mounting
Align the 4 tabs on the wallplate with
slots on the back of the thermostat,
then push gently until the thermostat
snaps in place.
Push excess wire back into
the wall opening.
Plug wall opening with
non-flammable insulation.
1H/1C Heat
Pump System
Rc Power [1]
R [R+Rc joined by jumper]
Y Compressor contactor
C 24VAC common [3]
O/B Changeover valve [7]
G Fan relay
2H/1C Heat
Pump System
(TH5220D only) [8]
Rc Power [1]
R [R+Rc joined by jumper]
Y Compressor contactor
C 24VAC common [3]
O/B Changeover valve [7]
G Fan relay
Aux Auxiliary heat relay [12]
E Emergency heat relay [12]
L Sends output when set to Em. Heat [11]
2H/1C Heat
Pump System
(TH5320U only) [8]
Rc Power [1]
R [R+Rc joined by jumper]
Y Compressor contactor
C 24VAC common [3]
O/B Changeover valve [7]
G Fan relay
Aux/E Auxiliary/Emergency heat relay
L Sends output when set to Em. Heat [11]
2H/2C Heat
Pump System
(TH5320U only) [9]
Rc Power [1]
R [R+Rc joined by jumper]
Y Compressor contactor (stage 1)
C 24VAC common [3]
O/B Changeover valve [7]
G Fan relay
Y2 Compressor contactor (stage 2)
L Sends output when set to Em. Heat [11]
3H/2C Heat
Pump System
(TH5320U only) [10]
Rc Power [1]
R [R+Rc joined by jumper]
Y Compressor contactor (stage 1)
C 24VAC common [3]
O/B Changeover valve [7]
G Fan relay
Aux/E Auxiliary/Emergency heat relay
Y2 Compressor contactor (stage 2)
L Sends output when set to Em. Heat [11]
See [notes] on page 4.
RcYG RC
RcYGAuxEL RC
RcYGAux
E
L RC
RcYGY2
RcYGAux
E
L RC
Y2
L RC
RcYG RC
RcYGAuxEL RC
RcYGAux
E
L RC
RcYGY2
RcYGAux
E
L RC
Y2
L RC
RcYG RC
RcYGAuxEL RC
RcYGAux
E
L RC
RcYGY2
RcYGAux
E
L RC
Y2
L RC
RcYG RC
RcYGAuxEL RC
RcYGAux
E
L RC
RcYGY2
RcYGAux
E
L RC
Y2
L RC
RcYG RC
RcYGAuxEL RC
RcYGAux
E
L RC
RcYGY2
RcYGAux
E
L RC
Y2
L RC