Ct87a,b,j round® thermostat – Honeywell CT87A User Manual
Page 7
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CT87A,B,J ROUND® THERMOSTAT
7
69-0274-6
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
FF
• H
EA
T
FAN
ON
•
A
U
T
O
M20185
POWER
CT87B SUBBASE
TO
SYSTEM
R
H
G
R
C
W
Y
FAN
HEAT
COOL
JUMPER
R
H
TO
R
C
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