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This will automatically signal the furnace to start. The inducer motor will start, and the hot surface ignitor will energize. When hot, the ignitor will have an orange glow. FFO 4 OFF2 3 1M P ON OFF C ONOFF OR OFF2 3 1M P ON OFF C ONOFF OR ON 13 14 OFF2 3 1M P ON OFF C ONOFF OR 15 16 17 OPEN 18 19 11. After 15 to 70 sec, 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 approximately 45 sec, the furnace blower is switched on. NOTE: If the main burners fail to ignite, the furnace control system will go through 3 more ignition cycles. Then, if burners fail to ignite, the system will lockout. If lockout occurs, or the blower doesn’t come on—shut down your furnace and call your dealer for service. 12. Set your thermostat to the temperature that satisfies your comfort requirements. SUGGESTION: 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 to obtain. 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 cycles on and off, controlled by the thermostat. In the ON position, the furnace blower runs continuously except for a 45-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. 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. 20.) 2. Close the external manual gas valve. (See Fig. 8 on page 4.) 3. Turn OFF the electrical supply 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 5. Turn the control knob or switch on PERFORMING ROUTINE furnace size with the proper filter size. CAUTION! 6 the gas valve to the OFF position. (See Fig. 22 or 23.) 20 21 22 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. ® FFOMAINTENANCE 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: FILTERING OUT TROUBLE 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 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 once a year. If installed with factory specified disposable 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 filter that was originally supplied. Use the Furnace Filter Table and compare your OFF2 3 1M P ON OFF C ONOFF OR 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. 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. ! The air filter for upflow furnaces is normally located in the blower compartment (See Fig. 03.) or in the factory- supplier filter cabinet attached to the side or bottom of the blower cabinet. Filters for the downflow furnaces are normally located in the return-air plenum above the blower. 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: UPFLOW FURNACES ONLY: 1. Turn off electrical supply to furnace. (See Fig. 9) 2. Remove door/access panel. • AIR FILTER(S) LOCATED IN BLOWER COMPARTMENT Remove control and blower access doors. (See Fig. 10 and 11) • AIR FILTER LOCATED IN FILTER CA...
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