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Conventional 3 Stage Heating, 2 Stage Cooling
Label:
Function:
Y1
Compressor Relay (Stage 1)
Y2
Compressor Relay (Stage 2)
relay
G
Fan Relay*
O/B
Heat Pump Changeover Valve
Rc
24VAC power from cooling transformer
W1
Heat Relay (Stage 1)
W2/AUX
Heat Relay (Stage 2)
C
24VAC Common Wire †
*
Star: W3
Rh
24VAC power from heating transformer ‡
Conventional 1 Stage Heating, 2 Stage Cooling
Label:
Function:
Y1
Compressor Relay (Stage 1)
Y2
Compressor Relay (Stage 2)
relay
G
Fan Relay*
O/B
Heat Pump Changeover Valve
Rc
24VAC power from cooling transformer
W1
Heat Relay (Stage 1)
W2/AUX
Heat Relay (Stage 2) / Auxiliary Heat Relay
C
24VAC Common Wire †
*
Star: W3, E, HUM/DHUM, 3rd-speed fan relay
Rh
24VAC power from heating transformer ‡
, 2nd-speed fan
/ Auxiliary Heat Relay
, E, HUM/DHUM, 3rd-speed fan relay
, 2nd-speed fan
11
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