Adjust Fan Operation Switch; Installing And Replacing Batteries; Mount Thermostat To Wallplate - Honeywell CT3451 Owner's Manual

FAN
RELAY
COMPRESSOR
CONTACTOR
1
L1
(HOT)
L2
TRANSFORMER
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2 JUMPER Y TO W.
3
JUMPER R TO Rc.
4
USE EITHER O OR B FOR HEAT PUMP CHANGEOVER.
Fig. 10. Typical single-stage heat pump system
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.
FAN OPERATION (FUEL) SWITCH
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.
T8002 THERMOSTAT
G
Rc
3
R
W
4
B
Y
2
O
COOL
CHANGEOVER
VALVE
HEAT
CHANGEOVER
VALVE
hookup.
E
F
Swing down the thermostat and press the lower edge
of the thermostat onto the wallplate to latch. See Fig.
12.
A
M20512
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.
M20530
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.
5
CT3451 PROGRAMMABLE THERMOSTAT
DASHED LINES INDICATE TABS
ON BACK OF THERMOSTAT
ENGAGE TABS AT TOP OF THERMOSTAT
WITH SLOTS ON WALLPLATE.
H o l d
T U E
S e l e
B
PRESS LOWER EDGE OF
CASE TO LATCH.
c t
M20513
69-1620—1