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
transformer
R
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
cooling transformer.
Heat Pump Terminals:
Rc
transformer
R
transformer
O/B Changeover valve
Y Compressor contactor
Y2 Compressor contactor (stage 2)
-
TH5320U only
G Fan relay
Aux Auxiliary heat relay*
E Emergency heat relay*
L Sends output when set to Em. Heat
C
*Aux and E terminals combined on TH5320U only.
Wiring
Terminal designations
Shaded areas below apply only to TH5320U/TH5220D or as otherwise noted.
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