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1H/1C Heat Pump System TH4110D [7]
C 24 Vac common [3]
B Changeover valve energized in
heating [5]
R [R+Rc joined by jumper]
Rc Power [1]
O Changeover valve energized in
cooling [5]
G Fan relay
Y Compressor contactor [6]
W [W+Y joined by jumper]
Heat Only System TH4110D
C 24Vac common [3]
R [R+Rc joined by jumper]
Rc Power [1]
W Heat relay
Heat Only System with Fan TH4110D
C 24 Vac common [3]
R [R+Rc joined by jumper]
Rc Power [1]
G Fan relay
W Heat relay
Cool Only System TH4110D
C 24 Vac common [3]
R [R+Rc joined by jumper]
Rc Power [1]
G Fan relay
Y Compressor contactor
2H/1C Heat Pump System TH4210D
C 24 Vac common [3]
B Changeover valve energized in
heating [5]
R Power [1]
L Sends output when set to Em. Heat [8]
O Changeover valve energized in
cooling [5]
G Fan relay
Y Compressor contactor
Aux Auxiliary heat relay [9]
E Emergency heat relay [9]
1H/1C System TH4110D (1 transformer)
C 24 Vac common [3]
R [R+Rc joined by jumper]
Rc Power [1]
G Fan relay
Y Compressor contactor
W Heat relay
1H/1C System TH4110D (2 transformers)
C 24 Vac common [3, 4]
R Power (heating transformer) [1, 2]
Rc Power (cooling transformer) [1, 2]
G Fan relay
Y Compressor contactor
W Heat relay
Wiring conventional and heat pump systems
CROGY
E
BAux L
CROGYW BRc
CROGYW BRc
CROGY
WB
Rc
CROW BRc
CROGW BRc
NOTES
Wire specifications:
Use 18- to 22-gauge thermostat wire.
Shielded cable is not required.
[1] Power supply. Provide disconnect means
and overload protection as required.
[2] Remove jumper for 2-transformer systems.
[3] Optional 24 Vac common connection.
[4] Common connection must come from cool-
ing transformer.
[5] Use either O or B terminals for changeover
valve.
[6] Use a small piece of wire (not supplied) to
connect W and Y terminals.
[7] Set fan operation switch to Heat Pump
(see page 5) and configure system type
for heat pump (see page 6).
[8] L terminal sends a continuous output when
thermostat is set to Em. Heat. Connect
to Honeywell zoning panels to switch the
panel to Emergency Heat.
[9] Install field jumper between Aux and E if
there is no emergency heat relay.
3


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