Filtering Out Trouble; Performing Routine Maintenance - Payne PG8UAA Operation And Maintenance Manual

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 switch on the gas valve to the OFF position. (See Fig. 23 or 24.)
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.

PERFORMING ROUTINE MAINTENANCE

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 maintenance, follow
these safety precautions:
! WARNING: Turn off electrical power supply to your furnace before removing the access doors to service or perform
maintenance. A failure to follow this warning could result in personal injury or death.
! CAUTION: Although special care has been taken to minimize sharp edges, be extremely careful when handling parts
or reaching into the furnace.

FILTERING OUT TROUBLE

A dirty filter will cause a loss of airflow in your duct system which may cause the furnace to cycle on the safety controls. If this condition
continues, the furnace will eventually shut down. The furnace filter should be checked every 3 or 4 weeks and cleaned if necessary.
If your furnace filter needs replacing, be sure to use the same size and type of filter that was originally supplied. Use the Furnace Filter Table
and compare your furnace size with the proper filter size.
! CAUTION: Never operate your furnace without a filter in place. Doing so may damage the furnace blower motor. An
accumulation of dust and lint on internal parts of your furnace can cause a loss of efficiency.
The air filter for upflow furnaces is normally located in the blower compartment. Filters for the downflow furnaces are normally located in the
return-air plenum above the blower. If the filters have been installed in another location, contact your dealer for instructions. To inspect, clean,
and/or replace the air filter(s), follow these steps:
•
UPFLOW FURNACES ONLY:
1. Turn OFF the electrical supply to the furnace. (See Fig. 22.)
2. Remove control and blower access doors.
3. Push filter retainer toward the bracket opening to release the filter. (See Fig. 25.)
4. Gently remove the filter and carefully turn the dirty side up (if dirty) to avoid "spilling" dirt from the filter. (See Fig. 26.)
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