Installation Manual

2
Power options
Wiring terminal designations
KEEP WIRES IN
THIS SHADED AREA
REMOVE FACOTRY-
INSTALLED JUMPER
ONLY FOR TWO-
TRANSFORMER
SYSTEMS
INSERT BATTERIES FOR
PRIMARY OR BACKUP POWER
CONNECT C FOR PRIMARY
AC POWER (OPTIONAL IF
BATTERIES ARE INSTALLED)
TH4110D TERMINAL
BLOCK SHOWN
TH4110D
C 24 Vac common. For 2-transformer
systems, use common wire from
cooling transformer.
B Changeover valve energized in heating
R 24 Vac power from heating transformer
Rc 24 Vac power from cooling transformer
O Changeover valve energized in cooling
G Fan relay
Y Compressor contactor
W Heat relay
CROGY
WB
Rc
CROGY
E
BAux L
TH4210D
C 24 Vac common
B Changeover valve energized in heating
R 24 Vac power
L Sends output when set to Em. Heat
O Changeover valve energized in cooling
G Fan relay
Y Compressor contactor
Aux Auxiliary heat relay
E Emergency heat relay