lockout. If lockout occurs, or the
blower doesn’t come on—shut down
your furnace and call your dealer for
Set your thermostat to the tempera-
ture that satisfies your comfort re-
Setting the thermostat back a few
degrees—and compensating for the
difference with warmer clothing—
can make a big difference in your
fuel consumption on extremely
cold days. The few degrees at the
top of your thermostat “comfort
level’’ are the most costly degrees
When the room temperature drops
below the temperature selected on
the thermostat, the furnace will be
switched on automatically. When the
room temperature reaches the degree
selected on the thermostat, the furnace
will be switched off automatically.
Some thermostats have a “fan’’ mode
with 2 selections: AUTO or ON. When
set on AUTO, the furnace blower cy-
cles on and off, controlled by the ther-
mostat. In the ON position, the furnace
blower runs continuously except for a
42-sec (62 sec low-stage for 2-stage
furnaces) delay at the “call for heat.’’
This keeps the temperature level in
your home more evenly balanced. It
also continuously filters the indoor air.
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. 14.)
2. Close the external manual gas
valve. (See Fig. 6 on page 4.)
3. Turn OFF the electrical supply to
your furnace. (See Fig. 15.)
Remove the outer door on your fur-
nace. (See Fig. 8.)
5. Turn the control switch on the gas
valve to the OFF position. (See
6. Replace the outer door. (See Fig.
7. If the furnace is being shut down
because of a malfunction, call your
dealer as soon as possible.
With the proper maintenance and care,
your furnace will operate economically
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 mainte-
nance, follow these safety precautions:
A dirty filter will cause excessive stress
on the furnace blower motor and can
cause it to overheat and automatically
shut down. The furnace filter should be
checked every 3 or 4 weeks and cleaned
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.
If your furnace filter needs replacing, be
sure to use the same size and type of fil-
ter that was originally supplied.
The air filter is located in the factory-
supplied filter cabinet attached to the
side or bottom of the blower cabinet.
If air filter has been installed in another
location, contact your dealer for instruc-
tions. To inspect, clean, and/or replace
the air filter(s), follow these steps:
1. Turn off electrical supply to fur-
nace (See Fig. 7.)
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.
been taken to minimize sharp
edges, be extremely careful
when handling parts or reach-
ing into the furnace.
Never operate your furnace
without a filter in place. Doing
so may damage the furnace
blower motor. An accumula-
tion of dust and lint on internal
parts of your furnace can
cause a loss of efficiency.