Power Options; Wiring; Terminal Designations - Honeywell PRO TH3110D Installation Manual

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