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4-WIRE SYSTEM
FAN
ON
HEATING
RELAY OR
VALVE COIL
1
L1
(HOT)
L2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2
INSTALL JUMPER BETWEEN RC AND RH.
Subbase Terminal
R or RH
Heating transformer power to control circuit
RX
Cooling transformer power to control circuit
W
Heating relay or valve
Y
Cooling relay
G
Fan relay
B
Heating changeover valve or damper control circuit
O
Cooling changeover valve or damper control circuit
P
Heat pump compressor control circuit.
FOR CT1802 heating/cooling
Connect the wires to matching terminals on the
subbase. Firmly tighten screws.
Push excess wire back into wall, and plug hole in
wall with nonflammable insulation to prevent drafts
from affecting thermostat operation.
CENTRAL ELECTRIC SYSTEM
W
B
R
FAN
ON
AUTO
FAN
COOLING
RELAY
CONTACTOR
COIL
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2
RC
RH
W
G
Y
COOL
AUTO
HEAT
OFF
FAN
COOLING
CONTACTOR
RELAY
COIL
M2414
TABLE 2—TERMINAL DESIGNATIONS.
Y
P
O
G
COOL
HEAT
OFF
HEATING
RELAY OR
VALVE COIL
1
L2
L1
(HOT)
M2412A
5-WIRE SYSTEM
FAN
HEATING
RELAY OR
VALVE COIL
1
L1
(HOT)
L2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Control Function
SINGLE STAGE HEAT PUMP
(WITHOUT AUXILIARY HEAT) SYSTEM
3
B
R
FAN
ON
COMPRESSOR
CONTACTOR
COIL
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2
IF COMPRESSOR IS CONNECTED TO OLD THERMOSTAT'S
"Y" TERMINAL WITH A JUMPER TO "W", USE NEW THERMOSTAT'S
"P" TERMINAL FOR COMPRESSOR. IF OLD THERMOSTAT HAS
ONE WIRE TO "Y" AND ONE TO "W", USE "Y" AND "W" ON NEW
THERMOSTAT; DO NOT USE "P". IMPORTANT– IF OLD
THERMOSTAT USES A W2 (AUXILIARY OR EMERGENCY HEAT)
TERMINAL, THIS THERMOSTAT MAY NOT BE USED. THIS
THERMOSTAT IS NOT DESIGNED TO CONTROL AUXILIARY HEAT.
3
SOME HEAT PUMPS USE "B" INSTEAD OF "O".
5
RC
RH
W
G
Y
COOL
ON
AUTO
HEAT
OFF
FAN
COOLING
RELAY
CONTACTOR
COIL
Y
W
2
P
O
G
COOL
AUTO
HEAT
OFF
FAN
REVERSING
RELAY
VALVE
L2
L1
(HOT)
69-0394—3
1
L1
(HOT)
L2
M2413
M2415B
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