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FocusPRO
TM
TH6110 / TH6220 / TH6320
3
Power options
Keep wires in this
shaded area
Connect C for primary AC power
(optional if batteries are installed).
Insert batteries for primary
or backup power.
Remove factory-
installed jumper
only for two-
transformer
systems.
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.
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 only
G Fan relay
Aux Auxiliary heat relay*
E Emergency heat relay*
L Sends output when set to Em. Heat
C 24VAC common
Wiring
Terminal designations
Shaded areas below apply only to TH6320U/TH6220D or as otherwise noted.
TH6110D
RcYWG RC
TH6110D
RcYG RC
TH6220D
Rc
YWGW2Y2
R
C
RcYGAuxEL RC
TH6220D
TH6320U
Rc
YWGW2Y2
R
C
RcYGAux
E
Y2L RC
TH63 20U
TH6110D
RcYWG RC
TH6110D
RcYG RC
TH6220D
Rc
YWGW2Y2
R
C
RcYGAuxEL RC
TH6220D
TH6320U
Rc
YWGW2Y2
R
C
RcYGAux
E
Y2L RC
TH63 20U
*Aux and E terminals combined on TH6320U only.