Honeywell CT87A round - Page 7

CT87A,B,J ROUND® THERMOSTAT
7 69-0274-5
Fig. 8–(CT87A for a 2-wire heating only system)
Fig. 9–(CT87A for a 3-wire hot water heating only system)
.
Fig. 10–(CT87B for a 4-wire heating/cooling system)
.
M20183
CT87A WALLPLATE
TO
SYSTEM
R
W
Y
POWER
HEAT
M20184
WIRE LABELS
(LETTERS
ON ORIGINAL
THERMOSTAT
TERMINALS)
CT87A WALLPLATE
3-WIRE
HOT WATER
ZONE VALVE
R
W
Y
R
B
W
C
O
O
L
•
O
F
F
•
H
E
A
T
F
A
N
O
N
•
A
U
T
O
M20185
POWER
CT87B SUBBASE
TO
SYSTEM
R
H G
R
C
W
Y
FAN
HEAT
COOL
JUMPER R
H TO RC