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5 69-0394—3
AUTO OFF
COOL
HEATON
FAN
W
Y
G
M2413
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
COIL
FAN
RELAY
L1
(HOT)
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
1
RC
RH
L1
(HOT)
L2
1
1
5-WIRE SYSTEM
AUTO OFF
COOL
HEATON
FAN
W
Y
G
M2414
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
COIL
FAN
RELAY
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
1
RC
RH
L1
(HOT)
L2
1
2 INSTALL JUMPER BETWEEN RC AND RH.
2
4-WIRE SYSTEM
TABLE 2—TERMINAL DESIGNATIONS.
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.
AUTO OFF
COOL
HEATON
FAN
B
O
W
Y
R
G
M2415B
P
COMPRESSOR
CONTACTOR
COIL
REVERSING
VALVE
L1
(HOT)
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
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.
SOME HEAT PUMPS USE "B" INSTEAD OF "O".
1
SINGLE STAGE HEAT PUMP
(WITHOUT AUXILIARY HEAT) SYSTEM
2
3
3
2
FAN
RELAY
AUTO OFF
COOL
HEATON
FAN
B
O
W
Y
R
G
M2412A
P
COOLING
CONTACTOR
COIL
HEATING
RELAY OR
VALVE COIL
FAN
RELAY
L1
(HOT)
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
1
1
CENTRAL ELECTRIC SYSTEM
Subbase Terminal Control Function
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.