Honeywell Round CT87A Installation Instructions Manual page 8

CT87A,B,J ROUND® THERMOSTAT
Fig. 11. CT87B for a 5-wire heating/cooling system.
Fig. 12. CT87J for a 4-wire single stage heat pump.
Fig. 13. CT87J for 4-wire single stage heat pump.
69-0274-6
R G
H
R
C
Y
W
W G
Y
P
R
B
JUMPER W TO Y
W G
Y
1
P
R
B
1
IF WIRES ARE ATTACHED TO Y OR W, AND P ON YOUR OLD
THERMOSTAT, CONTACT YOUR LOCAL CONTRACTOR FOR
FURTHER ASSISTANCE.
8
CT87B SUBBASE
HEATING
POWER
COOLING
POWER
CT87J SUBBASE
POWER
O
REVERSING VALVE
REVERSING VALVE
DO NOT ATTACH WIRES
TO BOTH B AND O
CT87J SUBBASE
REVERSING
REVERSING
O
HEAT PUMP
COMPRESSOR
DO NOT ATTACH WIRES
TO BOTH B AND O
TO
FAN
SYSTEM
TO
SYSTEM
COOL
HEAT
M20225
HEAT
TO
FAN
SYSTEM
COOL
HEAT
M20186
FAN
POWER
HEAT
VALVE
COOL
TO
SYSTEM
VALVE
M20228