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Power options
Keep wires in this
shaded area
TH3110D Terminal block shown
Wiring
Terminal designations
TH3110D:
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
W
Y
G
O
Rc
R
B
MCR29392
Remove factory-
installed jumper
only for two-
transformer
systems.
Connect
(optional if batteries are installed).
C
Insert batteries for primary or backup power
C
for primary AC power
TH3210D:
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
Fan relay
G
Y
Compressor contactor
Aux Auxiliary heat relay
E
Emergency heat relay
Aux
Y
G
O
L
3
PRO TH3000 series
MCR29391
R
B
C
M29393
69-1929EFS—01
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