Ct87a,b,j round® thermostat – Honeywell CT87A User Manual
Page 8
CT87A,B,J ROUND® THERMOSTAT
69-0274-6
8
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.
C
O
O
L
• O
FF
• H
EA
T
FAN
ON
•
A
U
T
O
M20225
HEATING
POWER
CT87B SUBBASE
TO
SYSTEM
TO
SYSTEM
R
H
G
R
C
W
Y
FAN
HEAT
COOLING
POWER
COOL
C
O
O
L
• O
FF
• H
EA
T
FAN
ON
•
A
U
T
O
M20186
HEAT
CT87J SUBBASE
TO
SYSTEM
W G
Y
P
B
R
O
FAN
POWER
DO NOT ATTACH WIRES
TO BOTH B AND O
JUMPER W TO Y
COOL
REVERSING VALVE
HEAT
REVERSING VALVE
C
O
O
L
• O
FF
• H
EA
T
FAN
ON
•
A
U
T
O
M20228
CT87J SUBBASE
TO
SYSTEM
W G
Y
P
B
O
R
POWER
FAN
DO NOT ATTACH WIRES
TO BOTH B AND O
HEAT PUMP
COMPRESSOR
COOL
REVERSING
VALVE
HEAT
REVERSING
VALVE
1
1
IF WIRES ARE ATTACHED TO Y OR W, AND P ON YOUR OLD
THERMOSTAT, CONTACT YOUR LOCAL CONTRACTOR FOR
FURTHER ASSISTANCE.