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6
to the shutdown procedures on the
furnace or see “Shutting Down Your
Furnace” section in this manual, and
call your dealer for service.
12. Set your thermostat to the tem-per-
ature that satisfies your com-fort
requirements.
SUGGESTION: Setting the ther-
mostat back a few degrees and
compensating for the difference
with warmer clothing can make a
big difference in your fuel con-
sumption. The few degrees at the
top of your thermostat “comfort
level’’ are the most costly degrees
to obtain.
When the room temperature drops
below the temperature selected on the
thermostat, the furnace will switch on
automatically. When the room temper-
ature reaches the setting selected on
the thermostat, the furnace will auto-
matically switch off.
Some thermostats have a “FAN’’
switch with 2 selections, AUTO and
ON. When thermostat is set to AUTO,
the furnace blower cycles on and off,
controlled by the thermostat. In ON
position, the furnace blower runs
continuously except for a 77-sec delay
at the “call for heat.’’ This keeps the
temperature level in your home more
evenly balanced. It also continuously
filters the indoor air. When FAN
switch is moved from ON to AUTO, the
furnace blower will continue running
for 90 sec before stopping.
SHUTTING DOWN
YOUR FURNACE
Should you ever suspect a malfunction
in your furnace, you will need to turn
the furnace off. The following proce-
dures must be followed:
1. Set your room thermostat to the
lowest temperature setting.
(See Fig. 20.)
2. Close the manual gas valve that is
located outside of the furnace cab-
inet. (See Fig. 8.)
3. Turn off electrical power to your
furnace. (See Fig. 21.)
4. Remove the control access door on
your furnace. (See Fig. 10 or 11.)
On upflow furnaces, removing the
blower access door is not
required.
5. Turn the control knob or electric
switch on the gas valve to the OFF
position. (See Fig. 22 or 23.)
6. Replace the control access door.
(See Fig. 16 or 17.)
7. If the furnace is being shut down
because of a malfunction, call
your dealer as soon as possible.
20
21
22
23
PERFORMING
ROUTINE
MAINTENANCE
With proper maintenance and care,
your furnace will operate econom-
ically and dependably. Basic
maintenance, which can easily be
accomplished by someone who
follows the directions, is found on
this and the following pages. However,
before beginning maintenance, follow
these safety precautions:
FILTERING OUT
TROUBLE
A dirty filter will cause excessive
stress on the furnace blower motor
and can cause it to overheat and auto-
matically shut down. The furnace
filter should be checked every 3 or 4
weeks and cleaned if necessary.
If installed with factory specified dis-
posable media filter, check or replace
filter before each heating and cooling
season. Replace disposable media filter
at least once a year.
®
F
F
O
WARNING
Turn off electrical power sup-
ply to your furnace before re-
moving the access doors to
service or perform mainte-
nance. A failure to follow this
warning could result in per-
sonal injury or death.
CAUTION
Although special care has
been taken to minimize sharp
edges, be extremely careful
when handling parts or reach-
ing into the furnace.
!
!
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ON
O
F
F
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ON
OFF
OR