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Installation Guide
4
69-2389—03
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Wiring guide—conventional systems
Wiring
1H/1C System (1 transformer)
R Power [1, 6]
W Heat relay
Y Compressor contactor
G Fan relay
C 24VAC common [2]
S1/S2 Optional outdoor/remote/discharge
sensor
U1/U1 Optional IAQ relay
Heat Only System
R Power [1]
W Heat relay
C 24VAC common [2]
S1/S2 Optional outdoor/remote/discharge
sensor
U1/U1 Optional IAQ relay
Heat Only System (Series 20)
R Series 20 valve terminal “R” [1]
W Series 20 valve terminal “B”
Y Series 20 valve terminal “W”
C 24VAC common [2]
S1/S2 Optional outdoor/remote/discharge
sensor
U1/U1 Optional IAQ relay
2H/2C System (1 transformer)
Y2 Cool relay 2
W2 Heat relay 2
R Power [1, 6]
W Heat relay 1
Y Cool relay 1
G Fan relay
C 24VAC common [2]
S1/S2 Optional outdoor/remote/discharge
sensor
U1/U1 Optional IAQ relay
Heat Only System With Fan
R Power [1, 6]
W Heat relay
G Fan relay
C 24VAC common [2]
S1/S2 Optional outdoor/remote/discharge
sensor
U1/U1 Optional IAQ relay
Cool Only System
R Power [1]
Y Compressor contactor
G Fan relay
C 24VAC common [2]
S1/S2 Optional outdoor/remote/discharge
sensor
U1/U1 Optional IAQ relay
See [notes] below
[1] Power supply. Provide disconnect means and overload protection as required.
[2] Optional 24VAC common connection.
[6] Only works with single transformer systems.