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Wiring
Wiring guide — heat pump systems
Shaded areas below apply only to TH5220D.
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
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.
G
C
Y
R
Rc
L
E
Aux
G
C
Y
R
Rc
[3]
[7]
L
Aux
G
C
Y
R
Rc
E
L
Y2
G
C
Y
R
Rc
L
Y2
Aux
G
C
Y
R
Rc
E
FocusPRO
2H/1C Heat
Pump System
[8]
Rc
Power
R
[R+Rc joined by jumper]
Y
Compressor contactor
C
24VAC common
O/B
Changeover valve
G
Fan relay
Aux
Auxiliary heat relay
E
Emergency heat relay
L
Sends output when set to Em. Heat
See
[notes]
on page 4.
5
TH5110 / TH50
TM
G
L
E
Aux
G
[1]
[3]
L
Aux
G
E
[7]
[10]
L
Y2
G
[10]
L
Y2
Aux
G
E
C
Y
R
Rc
C
Y
R
Rc
C
Y
R
Rc
C
Y
R
Rc
[9]
C
Y
R
Rc
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