Wiring
Wiring guide — conventional systems
Shaded areas below apply only to TH5320U/TH5220D or as otherwise noted.
1H/1C System
(1 transformer)
Rc Power [1]
R [R+Rc joined by jumper]
Y Compressor contactor
C
W Heat relay
G Fan relay
Heat-only System
Rc Power [1]
R [R+Rc joined by jumper]
C
W Heat relay
Heat-only System
(Series 20) [5]
Rc [R+Rc joined by jumper]
R [1]
Y
C
W
Heat-only System
(normally open zone valve) [5]
Rc [R+Rc joined by jumper]
R Power [1]
Y Normally open zone valve
C
1H/1C System
(2 transformers)
Rc Power (cooling transformer)
R Power (heating transformer)
Y Compressor contactor
C
W Heat relay
G Fan relay
Heat-only System
with Fan
Rc Power [1]
R [R+Rc joined by jumper]
C
W Heat relay
G Fan relay
Cool-only System
Rc Power [1]
R [R+Rc joined by jumper]
Y Compressor contactor
C
G Fan relay
2H/2C System
(1 transformer) [6]
Rc Power [1]
R [R+Rc joined by jumper]
Y Compressor contactor (stage 1)
C
W Heat relay (stage 1)
G Fan relay
W2 Heat relay (stage 2)
Y2 Compressor contactor (stage 2)
2H/2C System
(2 transformers) [6]
Rc Power (cooling transformer)
R Power (heating transformer)
Y Compressor contactor (stage 1)
C
W Heat relay (stage 1)
G Fan relay
W2 Heat relay (stage 2)
Y2 Compressor contactor (stage 2)
See
[notes] below
NOTES
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.
[4] Common connection must come from
cooling transformer.
[5]
Heat Only.
[6]
2Heat/2Cool Conventional.
O or B.
[8]
2Heat/1Cool Heat Pump.
[9]
2Heat/2Cool Heat Pump.
[10]
.
[11] 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.
[12] Install field jumper between Aux and E if
there is no emergency heat relay.
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