Combustion Area and Vent System

!WARNING

UNIT OPERATION HAZARD

Failure to follow this warning could result in personal injury or death.

For proper and safe operation the furnace needs air for combustion and ventilation. Do not block or obstruct air openings on the furnace, air opening to the area in which the furnace is installed, and the space around the furnace.

!WARNING

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in personal injury or death.

If holes are found or if the vent pipe is obstructed or is not connected, toxic fumes can escape into your home. DO NOT OPERATE YOUR FURNACE. Call your dealer for service.

Inspect the combustion area and vent system before each heating season. An accumulation of dirt, soot, or rust can mean a loss of efficiency and improper performance. Buildups on the main burners can cause faulty firing. This “delayed ignition” is characterized by an alarmingly loud sound.

NOTE: If your furnace makes a loud noise when the main burners are ignited, shut down the furnace and call your servicing dealer.

Use your flashlight and follow these steps for inspecting the combustion area and vent system of your furnace:

1.Turn off electrical supply to the furnace and remove the ac- cess door. (See Fig. 6 and 7.)

2.Carefully inspect the gas burner for dirt, rust, or scale. In- spect the elbow, flue connection area, and the vent pipe for rust.

A92330

Fig. 20 - Burner Flame

!WARNING

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in personal injury or death.

If dirt, rust, soot, or scale accumulations are found, call your dealer. Do not operate your furnace.

3.Inspect the vent pipe for a sag, holes, or a disconnection. A horizontal vent pipe must slope upward away from furnace.

If rusty joints or seams, or signs of water leakages are found, call your dealer for service.

4.Restore electrical power to the furnace. (See Fig. 11.)

5.Start the furnace and observe its operation. If possible, watch the burner flames. Are they burning bright blue? If not or if you suspect some other malfunction, call your ser- vicing dealer.

6.Replace the access door. (See Fig. 10.)

BEFORE YOU REQUEST A

“SERVICE CALL”

Before you call for service, check for several easily solved problems:

SCheck for sufficient airflow. Check the air filter for dirt. Check for blocked return-air or supply-air grilles. Be sure they are open and unobstructed. If this isn’t the cause of the problem, call

your servicing dealer. If your furnace isn’t operating at all, check the following list for easily solved problems:

SIs your thermostat set above room temperature? Is the HEAT mode selected?

SIs the electrical power supply switch on? Is the blower access door firmly in place? Are any fuses blown? (There is a fuse on

the furnace control.) Has a circuit breaker tripped?

SIs the manual shut-off valve in the gas supply pipe leading to the furnace open? Does the lever point in the same direction that the pipe runs (open)? Or is it at a right angle to the pipe (closed)? NOTE: Before proceeding with the next checks, turn off the electrical power supply to the furnace. Remove access door.

SIs the switch on the gas valve turned to the ON position? If this or the preceding check shows an interruption in the gas supply, make sure the gas has not been shut off for safety reasons. If nothing else seems to be wrong, follow the start-up procedures found on pages 4 and 5 of this booklet.

!CAUTION

PERSONAL INJURY HAZARD

Failure to follow this caution may result in personal injury.

If for some reason the vent is blocked, the draft safeguard switch will shut off the furnace. (See Page 2 for switch location.) The switch will automatically reset after the furnace cools off. If the furnace fails to operate, contact a qualified service agency.

SCheck the manual reset limit switches located on the ends of the burner enclosure (see Fig. 1 and 2). If the furnace has

experienced a high-temperature condition due to inadequate combustion air, these switches will shut off the furnace. Reset the switches by pushing the button on the switch. If the switch trips a second time, turn off the furnace and call for service.

SIf your furnace still fails to operate, call your servicing dealer for troubleshooting and repairs. Tell your dealer the model and serial numbers for your furnace. (You should have them recorded on page 10 of this booklet.) By knowing exactly which furnace you have, the dealer may be able to offer suggestions over the phone or save valuable time through knowledgeable preparation for the service call.