—6—
8. Turn ON the electrical supply to the furnace. (See Fig. 18.)
9. Open the external manual gas valve. (See Fig. 19.)
10. Set the room thermostat to a temperature slightly above the room temperature. This will automatically signal the furnace to start. The
inducer motor will start, and the hot surface igniter will energize. When hot, the igniter will have an orange glow.
11. Thirty to forty seconds after the thermostat is adjusted to signal the furnace to start, the gas valve will permit gas to flow to the main burners
and be ignited. Hot flames begin to warm the furnace’s heat exchanger. After another time delay of approximately 45 sec, the furnace
blower will start to run.
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 temperature 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. 21.)
3. Turn OFF the electrical supply to your furnace. (See Fig. 22.)
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