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Wire Reference Table
Possible Wires
R or V or VR
RH and RC Single power for HEAT and COOL
RH or 4
RH Power for HEAT (RH not connected to RC jumper removed)
RC
RC Power for COOL (RH not connected to RC jumper removed)
W / AUX
W Heat control or heat pump auxiliary heat
W2 / AUX2
W2 2nd stage HEAT or 2nd stage of 2 stage auxiliary heat
W3 / AUX3
W3 3rd stage HEAT or 3rd stage of 3 stage auxiliary heat
Y
Y COOL control or 1st stage compression for heat pump
Y2
Y2 2nd stage COOL control or 2nd stage compression for a heat pump
G or F
G FAN control
C or X
C 24VAC power (to power thermostat)
H
H External Humidifier
DH
DH External De-Humidifier
EX
EX external fresh air baffle
B
B Heat pump changeover (cool to heat, powered in heat)
O
O Heat pump changeover (heat to cool, powered in cool)
B and O
products) DO NOT CONNECT B to B terminal, connect B to C
terminal. If not a Trane product tape off B.
E
n/a Emergency heat (do not connect, tape off)
L
n/a System monitor (do not connect, tape off)
T
n/a Outdoor sensor (do not connect, tape off)
What They Control
NOTE: TRANE uses B for this connection
IMPORTANT: If there are both B and O wires (Trane pump
Wire Reference
17
PG
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