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CT3451 PROGRAMMABLE THERMOSTAT
5 69-1620—1
Fig. 10. Typical single-stage heat pump system
hookup.
5 ADJUST FAN OPERATION
SWITCH
The 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
BATTERIES
The 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
1
POWER 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
S
Y
S
T
E
M
Cool Off Heat
Auto On
FAN
Hold
Select
T
U
E
PM