CT3451 PROGRAMMABLE THERMOSTAT
5 69-1620—1
Fig. 10. Typical single-stage heat pump system
hookup.
5 ADJUST FAN OPERATION SWITCHThe thermostat fan operation switch, labeled fuel switch
in Fig. 11, is set at the factory in the F (gas/oil fuel)
position. This is the correct setting for most systems. If
you have an electric heat system, set the switch to the E
(electric) position. The E setting allows the fan to turn on
immediately with the heating equipment in a system
where the G terminal is connected.See Fig. 11.
Fig. 11. Fan operation (fuel) switch.
6 MOUNT THERMOSTAT TO WALLPLATE❑Slide System switch to the Off position.
❑Engage the tabs at the top of the thermostat and
wallplate.
❑Swing down the thermostat and press the lower edge
of the thermostat onto the wallplate to latch. See Fig.
12.
Fig. 12. Mounting thermostat to wallplate.
7 INSTALLING AND REPLACING BATTERIESThe thermostat requires three AA alkaline batteries to
operate:
❑Remove the battery door, located on the right side of
the thermostat, by pulling outward from the bottom.
See Fig. 13.
❑Insert three AA alkaline batteries as shown in Fig. 13.
NOTE: The thermostat shows a “bAtLo” message on
the digital display to alert the homeowner one to
two months before the batteries run out com-
pletely.
IMPORTANT
Homeowner should replace the batteries once a
year to prevent leakage and/or the heating/cool-
ing system from shutting down due to lack of
battery power in the thermostat.
L1
(HOT)
L2
M20512
FAN
RELAY
T8002 THERMOSTAT
COMPRESSOR
CONTACTOR
TRANSFORMER
1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
JUMPER Y TO W.
JUMPER R TO Rc.
USE EITHER O OR B FOR HEAT PUMP CHANGEOVER.
2
1
Y
G
Rc
W
3
4
R
B
O
2
HEAT
CHANGEOVER
VALVE
COOL
CHANGEOVER
VALVE
3
4
M20530
FAN OPERATION (FUEL) SWITCH
F
E
M20513
DASHED LINES INDICATE TABS
ON BACK OF THERMOSTAT
ENGAGE TABS AT TOP OF THERMOSTAT
WITH SLOTS ON WALLPLATE.
PRESS LOWER EDGE OF
CASE TO LATCH.
A
B
SYSTEM
Cool Off Heat
Auto On
FAN
Hold
Select
SYSTEM
Cool Off Heat
Auto On
FAN
Hold
Select
TUE
PM