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Power options
Keep wires in this
shaded area
Wiring
Terminal designations
Shaded areas below apply only to
Conventional Terminals:
Rc
24VAC power from cooling
transformer
R
24VAC power from heating
transformer
W
Heat relay (stage 1)
W2 Heat relay (stage 2)
Y
Compressor contactor (stage 1)
Y2
Compressor contactor (stage 2)
G
Fan relay
C
24VAC common. For 2 transformer
systems, use common wire from cooling
transformer.
TH6110D
G
W
C
Y
R
Rc
TH6220D
Y2
W2
G
W
C
Y
TH6320U
Y2
W2
G
W
C
Remove factory-
installed jumper
only for two-
transformer
systems.
TH6320U/TH6220D
R
Rc
Y
R
Rc
MCR29437A
Insert batteries for primary
or backup power.
C
Connect
for primary AC power
(optional if batteries are installed).
or as otherwise noted.
Heat Pump Terminals:
Rc
24VAC power from cooling
transformer
R
24VAC power from heating
transformer
O/B Changeover valve
Y
Compressor contactor (stage 1)
Y2
Compressor contactor (stage 2)
-TH6320U
G
Fan relay
Aux/E Auxiliary/Emergency heat relay
L
Sends output when set to Em. Heat
C
24VAC common
TH6110D
G
C
Y
R
TH6220D
L
Aux
G
C
E
TH6320U
L
Y2
Aux
G
E
3
FocusPRO
TH6000 Series
®
MCR29436
only
Rc
Y
R
Rc
C
Y
R
Rc
MCR29438A
69-2695EFS—01
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