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12. After about 17 seconds, the gas valve permits gas to flow to the
main burners where it is ignited. Hot flames begin to warm
the furnace's heat exchanger. After a time delay of approxim-
ately 25−45 seconds the furnace blower is switched on.
NOTE: If the main burners fail to ignite, the furnace control
system will go through three more ignition cycles. Then if burners
fail to ignite, the system will lockout. If lockout occurs or the
blower does not come on, shut down your furnace and call your
dealer for service.
13. Set your thermostat to the temperature that satisfies your
comfort
requirements.
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 to obtain.
When the room temperature drops below the temperature selected
on the thermostat, the furnace will switch on automatically. When
the room temperature reaches the setting selected on the thermostat,
the furnace will be automatically switched off.
Continuous Fan Operation −Some thermostats have a "FAN"
switch with 2 selections: AUTO and ON. When thermostat is set
on AUTO, the furnace blower cycles on and off, controlled by the
thermostat. In ON position, the furnace blower runs continuously
except for a 42−62 sec delay at the "call for heat." Continuous fan
keeps the temperature level in your home more evenly balanced. It
also continuously filters the indoor air.
On all but the WFMR or WFML, the continuous fan blower speed
can be increased or decreased if desired due to change of seasons,
large gatherings in your home, etc. Simply change your "FAN"
switch from "on" to "off" (or "auto" depending on your
thermostat), and then return to "on", within 1 to 3 seconds. The
blower will switch to the next highest speed. There are at least 3
speeds to choose from. If the blower is running on its highest
speed, a request to change will direct the blower to return to its
lowest speed.
SHUTTING DOWN YOUR FURNACE
Should you ever suspect a malfunction in your furnace, you will
need to turn the furnace off. The following procedures must be
followed:
1. Set your room thermostat to the lowest temperature setting.
(See Fig. 3.)
2. Close the external manual gas valve (See Fig. 4).
3. Turn off electrical supply to the furnace. (See Fig. 5.)
4. Remove outer furnace door. (See Fig. 6.)
5. Turn the switch on the gas control to the OFF position. (See
Fig.7.)
6. Replace the outer furnace door. (See Fig. 9.)
7. If the furnace is being shut down because of a malfunction, call
your dealer as soon as possible.
PERFORMING ROUTINE MAINTENANCE
With proper maintenance and care, your furnace will operate
economically and dependably. Instructions for basic maintenance
are found on this and the following pages. However, before
beginning maintenance, follow these safety precautions:
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Turn off electrical power supply to your furnace before
removing the access doors to service or perform
maintenance.
5
SUGGESTION:
Setting
the
Specifications subject to change without notice.
CAUTION
!
CUT HAZARD
Failure to follow this caution may result in personal injury.
Although special care has been taken to minimize sharp
edges, be extremely careful when handling parts or reaching
into the furnace.
Wear safety glasses, gloves, and
appropriate protective clothing.
FILTERING OUT TROUBLE
CAUTION
!
UNIT PERFORMANCE HAZARD
Failure to follow this caution may result in product damage.
Never operate your furnace without a filter in place. Doing
so may damage the furnace blower motor.
accumulation of dust and lint on internal parts of your
furnace can cause a loss of efficiency.
A dirty filter will cause excessive stress on the furnace, heat
exchanger, and blower motor and can cause it to overheat and
automatically shut down. The furnace filter should be checked
every 4 weeks and cleaned or replaced if necessary.
If installed with factory specified disposable media filter, check or
replace filter before each heating and cooling season. Replace
disposable media filter at least twice a year.
If your furnace filter needs replacing, be sure to use the same size
and type of filter that was originally specified.
The air filter for the furnace may be located in a filter cabinet/rack
attached to the side or bottom of the furnace. If air filter has been
installed in another location, contact your dealer for instructions.
To inspect, clean and/or replace the air filter(s), follow these steps:
1. Turn off the electrical supply to the furnace. See Fig. 12.
Fig. 12 − Turn Off Electrical Supply
2. Remove filter cabinet door/rack.
3. Slide air filter out of filter cabinet/rack. Keep dirty side up
(if dirty) to avoid spilling dirt.
4. Inspect the filter. If torn, replace it.
NOTE: If the filter is:
a. a factory specified disposable media filter — Do not
clean. If dirty, replace only with media filter having the
same part number and size. Install with airflow direction
arrow pointing towards blower.
b. an Electronic Air Cleaner (EAC) — Refer to EAC
Owner's Manual for maintenance information.
c. a factory specified disposable filter do not clean, replace
it with a new filter of same size.
An
A92185
441 02 7000 02
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