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SHUTTING DOWN
YOUR FURNACE
Should you need to shut down your furnace for service or maintenance, you will need to turn the furnace off.
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17
18
The following procedures must be followed:
1.Set your room thermostat to the lowest temperature setting. (See Fig. 17.)
2.Close the external manual gas valve. (See Fig. 7.)
3.Turn off electrical supply to the furnace. (See Fig. 18.)
4.Remove main furnace door. (See Fig. 9.)
5.Turn control switch or knob on the gas valve to OFF position.
(See Fig. 19 or 20.)
6.Replace main furnace door. (See Fig. 14.)
7.If the furnace is being shut down because of a malfunction, call your dealer as soon as possible.
!CAUTION
Furnace is not to be installed, operated, and then turned off and left turned off in an unoc- cupied structure during winter. (See winterizing procedures in maintenance section.)
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OFF 
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6
PERFORMING
ROUTINE
MAINTENANCE
With proper maintenance and care, your furnace will operate economically and dependably. Instructions for basic main- tenance are found on this and the follow- ing pages. However, before beginning maintenance, follow these safety pre- cautions:
!WARNING
Turn off electrical power sup- ply to your furnace before re- moving the main furnace door to service or perform mainte- nance. 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.
FILTERING OUT
TROUBLE
A dirty air filter will cause a loss of airflow in your duct system. When excessive loss of airflow occurs, the furnace may cycle on its safety controls. If this condition is left unattended, the furnace will eventu- ally lock out. It is recommended that the furnace air filter be checked every 3 or 4 weeks and cleaned if necessary.
!CAUTION
Never operate your furnace without the air filter in place. Doing so may damage the fur- nace blower motor. An accu- mulation of dust and lint on internal parts of your furnace can cause a loss of efficiency.
The air filter is normally located in the blower compartment. (See Fig. 2.)
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 electrical supply to the furnace. (See Fig. 18.)
2.Remove main furnace door. (See Fig. 21.)
3.Remove blower access panel. (See Fig. 22.)
