Honeywell THE DIGITAL ROUND CT8775A Owner's Manual page 9

Terminal on
Old Connect to Terminals
Thermostat
R R
Rh
(see Note 1)
4
V
Rc —
R
(see Note 1)
W, W , H W
1
Y, Y , M —
1
G, F —
O —
B —
(see Note 3)
C Do not connect.
(see Note 4)
X
(see Note 4)
B
(see Note 3)
W , H Do not continue
2 2
installation. Call 1-800-
Y
2 468-1502.
NOTES:
1. If wires were connected to both Rh and R terminals on the old thermostat, remove jumper between R and Rc on
the new thermostat and connect Rh to R and R to Rc.
2. If wires will be connected to both R and Rc on the new thermostat, remove jumper between R and Rc.
3. Do not connect both O and B when wiring to a single stage heat pump. Connect O to O. Tape off B with electri-
cal tape and do not use.
4. Tape off wire with electrical tape and do not use.
Table 2. Terminal Designations on Old and New Thermostats.
Connect To Terminals
on CT8775A
R
(see Note 2)
Rc
W
Y
G
O
B
(see Note 3)
Do not connect.
Do not continue
installation. Call 1-800-
468-1502.
on CT8775C
Power
Power for cooling
(see Note 2)
Heat
Cooling
Fan
Changeover in cool. (Single stage heat pump
only).
Changeover in heat. (Single stage heat pump
only).
Transformer common
Second stage heat.
Second stage cool.
9
Description
69-1676—1