Radio Thermostat CT102 User Manual page 23

Wire Reference Table
Possible Wires
R or V or VR
RH or 4
RC
W
W2
W3
Y
Y2
G or F
C or X
H
DH
EX
B
O
B and O
E
L
T
What They Control
RH and RC Single power for HEAT and COOL
RH Power for HEAT (RH not connected to RC jumper clip
removed)
RC Power for COOL (RH not connected to RC jumper clip
removed)
W Heat control
W2 2nd stage HEAT or heat pump auxiliary heat
W3 3rd stage HEAT or 2nd stage of 2 stage auxiliary heat
Y COOL control or 1st stage compression for heat pump
Y2 2nd stage COOL control or 2nd stage compression for
a heat pump
G FAN control
C 24VAC power (to power thermostat) NOTE: TRANE uses B
for this connection
H External Humidifier
DH External De-Humidifier
EX external fresh air baffle
B Heat pump changeover (cool to heat, powered in heat)
O Heat pump changeover (heat to cool, powered in cool)
IMPORTANT: If there are both B and O wires (Trane pump
products) DO NOT CONNECT B to B terminal. Instead,
connect B to C terminal. If not a Trane product, tape off B.
n/a Emergency heat (do not connect, tape off)
n/a System monitor (do not connect, tape off)
n/a Outdoor sensor (do not connect, tape off)
Installation Guide CT102
Wiring Diagrams
23