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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
I 1
I
-
U
I I
CONTACTOR
RELAY OR
VALVE COIL
A
POWER SUPPLY. PROVIDE DISCONNECT MEANSAND
M%1*
OVERLOAD PROTECTION
AS
REOUIRED.
8
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