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Installation Guide
4
Wiring
Wiring guide — conventional systems
Shaded areas below apply only to TH6320U/TH6220D or as otherwise noted.
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 24VAC common connection.
[4] Common connection must come from cool-
ing transformer.
[5] In Installer Setup, set system type to Heat Only.
[6] In Installer Setup, set system type to 2Heat/
2Cool Conventional.
[7] In Installer Setup, set changeover valve to O
or B.
[8] In Installer Setup, set system type to 2Heat/
1Cool Heat Pump.
[9] In Installer Setup, set system type to 2Heat/
2Cool Heat Pump.
[10] In Installer Setup, set system type to 3Heat/
2Cool Heat Pump.
[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.
1H/1C System
(1 transformer)
Rc Power [1]
R [R+Rc joined by jumper]
Y Compressor contactor
C 24VAC common [3]
W Heat relay
G Fan relay
Heat-only System
Rc Power [1]
R [R+Rc joined by jumper]
C 24VAC common [3]
W Heat relay
Heat-only System
(Series 20) [5]
Rc [R+Rc joined by jumper]
R Series 20 valve terminal “R” [1]
Y Series 20 valve terminal “W”
C 24VAC common [3]
W Series 20 valve terminal “B”
Heat-only System
(normally open zone valve) [5]
Rc [R+Rc joined by jumper]
R Power [1]
Y Normally open zone valve
C 24VAC common [3]
1H/1C System
(2 transformers)
Rc Power (cooling transformer) [1, 2]
R Power (heating transformer) [1, 2]
Y Compressor contactor
C 24VAC common [3, 4]
W Heat relay
G Fan relay
Heat-only System
with Fan
Rc Power [1]
R [R+Rc joined by jumper]
C 24VAC common [3]
W Heat relay
G Fan relay
Cool-only System
Rc Power [1]
R [R+Rc joined by jumper]
Y Compressor contactor
C 24VAC common [3]
G Fan relay
2H/2C System
(1 transformer) [6]
Rc Power [1]
R [R+Rc joined by jumper]
Y Compressor contactor (stage 1)
C 24VAC common [3]
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) [1, 2]
R Power (heating transformer) [1, 2]
Y Compressor contactor (stage 1)
C 24VAC common [3, 4]
W Heat relay (stage 1)
G Fan relay
W2 Heat relay (stage 2)
Y2 Compressor contactor (stage 2)
See [notes] below
RcW RC
RcYWGW2Y2 RC
RcYWGW2Y2 RC
Rc
YG
R
C
RcYWG
R
C
RcWG
R
C
RcYWG
R
C
Rc
YW RC
Rc
Y RC
RcW RC
RcYWGW2Y2 RC
RcYWGW2Y2 RC
Rc
YG
R
C
RcYWG
R
C
RcWG
R
C
RcYWG
R
C
Rc
YW RC
Rc
Y RC
RcW RC
RcYWGW2Y2 RC
RcYWGW2Y2 RC
Rc
YG
R
C
RcYWG
R
C
RcWG
R
C
RcYWG
R
C
Rc
YW RC
Rc
Y RC
RcW RC
RcYWGW2Y2 RC
RcYWGW2Y2 RC
Rc
YG
R
C
RcYWG
R
C
RcWG
R
C
RcYWG
R
C
Rc
YW RC
Rc
Y RC
RcW RC
RcYWGW2Y2 RC
RcYWGW2Y2 RC
Rc
YG
R
C
RcYWG
R
C
RcWG
R
C
RcYWG
R
C
Rc
YW RC
Rc
Y RC
RcW RC
RcYWGW2Y2 RC
RcYWGW2Y2 RC
Rc
YG
R
C
RcYWG
R
C
RcWG
R
C
RcYWG
R
C
Rc
YW RC
Rc
Y RC
RcW RC
RcYWGW2Y2 RC
RcYWGW2Y2 RC
Rc
YG
R
C
RcYWG
R
C
RcWG
R
C
RcYWG
R
C
Rc
YW RC
Rc
Y RC
RcW RC
RcYWGW2Y2 RC
RcYWGW2Y2 RC
Rc
YG
R
C
RcYWG
R
C
RcWG
R
C
RcYWG
R
C
Rc
YW RC
Rc
Y RC
RcW RC
RcYWGW2Y2 RC
RcYWGW2Y2 RC
Rc
YG
R
C
RcYWG
R
C
RcWG
R
C
RcYWG
R
C
Rc
YW RC
Rc
Y RC