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Wiring
Wiring guide — 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 [3]
O/B
Changeover valve
G
Fan relay
2H/1C Heat
Pump System
(TH6220D
only)
[8]
Rc
Power
[1]
R
[R+Rc joined by jumper]
Y
Compressor contactor
C
24VAC common [3]
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
(TH6320U
only)
[8]
Rc
Power
[1]
R
[R+Rc joined by jumper]
Y
Compressor contactor
C
24VAC common [3]
O/B
Changeover valve
G
Fan relay
Aux/E Auxiliary/Emergency heat relay
L
Sends output when set to Em. Heat
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.
TH6320U/TH6220D
G
C
Y
R
Rc
MCR29448
[7]
L
Aux
G
C
Y
R
Rc
E
MCR29449A
[7]
[11]
L
Aux
G
C
Y
R
Rc
E
MCR29450
[7]
[11]
or as otherwise noted.
2H/2C Heat
Pump System
(TH6320U
only)
[9]
Rc
Power
[1]
R
[R+Rc joined by jumper]
Y
Compressor contactor (stage 1)
C
24 VAC common [3]
O/B
Changeover
G
Fan relay
Y2
Compressor contactor (stage 2)
L
Sends output when set to Em. Heat
3H/2C Heat
Pump System
(TH6320U
only)
[10]
Rc
Power
[1]
R
[R+Rc joined by jumper]
Y
Compressor contactor (stage 1)
C
24VAC common [3]
O/B
Changeover valve
G
Fan relay
Aux/E Auxiliary/Emergency heat relay
Y2
Compressor contactor (stage 2)
L
Sends output when set to Em. Heat
See
[notes]
on page 4.
5
FocusPRO
TH6000 Series
®
L
Y2
G
C
valve [7]
L
Y2
Aux
G
C
E
[7]
MCR29453
69-2695EFS—01
Y
R
Rc
MCR29451
[11]
Y
R
Rc
MCR29452
[11]
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