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OLDSUBBASE
TERMINAL
R
or RH
RC
W
Y
G
B
0
P
Push excess wire back into wall. and plug
hole in wall with nonflammable insulation to
prevent drafts from affecting thermostat operation.
CONTROL FUNCTION
Heating transformer power to
control circuit
Cooling transformer power to
control circuit.
Heating relay or valve.
Cooling relay.
Fan relay.
Heating changeover valve or
damper control circuit.
Cooling changeover valve or
damper control circuit.
Heat pump compressor control
For
CT1502
heatinglcooling
CENTRAL ELECTRIC SYSTEM
I1
I-
U
II
CONTACTOR
RELAY
OR
VALVE
COIL
A
POWER
SUPPLY.
PROVIDE
DISCONNECT
MEANSAND
M%1*
OVERLOAD PROTECTION
AS
REOUIRED.
8