Installation Guide
Wiring
Wiring
guide-conventional
systems
Shaded areas below apply
Q.!lbl
to
TH8320/TH8321.
1H/1C
System
(1
transformer)
Rc 3 Power [1]
R [R+Rc
JOined
by jumper]
W Heat relay
Y Compressor contactor
G
Fan
relay
C
24VAC
common
[3]
S1
Optional outdoor/remote sensor
S2 Optional outdoor/remote sensor
Heat
Only
System
Rc 3 Power
[1]
R [R+Rc
JOined
by
jumper]
W Heat relay
C
24VAC
common
[3]
S1
Optional outdoor/remote sensor
S2 Optional outdoor/remote sensor
Heat
Only
System
(Series
20)
Rc 3 [R+Rc joined
by
jumper]
R Senes 20 valve terminal
"R"
[1]
W Series 20 valve terminal
"8"
Y Series 20 valve terminal
"W"
C
24VAC
common [3]
S1
Optional outdoor/remote sensor
S2 Optional outdoor/remote sensor
2H/2C
System
(1
transformer)
Y2
Cool relay 2
W2
Heat relay 2
Power.
[1]
tR+Rc joined
by
jumper]
w
Heat
relay
1
Y
..
Cool relaY 1
Fan relay
c
24VAC
common [3]
S1
...
Qptionaloutdoor/remote sensor
S2
Optional outdoor/remote sensor
See [notes]
below
1H/1C
System
(2
transformers)
Rc Power (cooling transformer) [1,
2]
R Power (heating transformer) [1,
2]
W Heat relay
Y Compressor contactor
G
Fan
relay
C
24VAC
common [3, 4]
S1
Optional outdoor/remote sensor
S2 Optional outdoor/remote sensor
Heat
Only
System
With
Fan
Power
[1]
[R+Rc joined
by
jumper]
W Heat relay
G Fan relay
c
24VAC
common [3]
S1
Optional outdoor/remote sensor
S2
Optional outdoor/remote sensor
Cool
Only
System
Rc
3 Power
[11
R [R+Rc
JOined
by
Jumper]
Y Compressor contactor
G Fan relay
C
24VAC
common
[3]
S1
Optional outdoor/remote sensor
S2
Optional outdoor/remote sensor
2H/2C
System
(2
transformers)
Y2
Cool relay 2
W2
Heat relay 2 .
Rc
Power (cooling transformer) [1, 2]
R Power (heating transformer) [1,
2]
W Heat relay 1
y
C991
relay1
G Fan relay
c.
.
24VAC
common [3,
4]
S1
Optional outdoor/remote sensor
S2
Optional outdoor/remote sensor
[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 cooling transformer.
4
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