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34 and 35) 9. Turn on electrical supply to furnace (see Fig 18). NOTE: For upflow models only—if side return ducts are used, 2 filters may be required in some models. The procedure listed above may be used to remove side filters. 27 28 DOWNFLOW/HORIZONTAL FURNACES ONLY: Two filters are located in the return-air plenum above the blower (above lineof- sight) resting in the V-shaped channel on top of the furnace. (See Fig. 27.) 1. Turn OFF electrical supply to the furnace. (See Fig. 21.) 2. Remove blower access door after removing 2 screws. 3. Remove the left-side filter by tipping the filter toward the center— raise it from the V-shaped channel in which it rests. (See Fig. 27 and 28.) 4. Lower filter down along side of the blower and remove from the furnace. 5. To remove the second filter, lift from V-shaped channel and remove the same way as left side filter. 6. Inspect the filters. If torn, replace the filter. 7. Wash the filters (if dirty) in a sink, bathtub, or outside with a garden hose. Always use cold tap water. A mild liquid detergent may be used if necessary. Spray water through the filter in the opposite direction of airflow. Allow filter to dry. 8. Reinstall clean filters. 9. Replace blower door (secure with 2 screws) and turn ON electrical power to your furnace. UPFLOW FURNACE AIR FILTER TABLE AIR FILTER LOCATED IN BLOWER COMPARTMENT FURNACE CASING WIDTH FILTER SIZE (IN.) FILTER TYPESide Return Bottom Return 14-3/16 (1)16x25x1* (1)14x25x1 Cleanable 17-1/2 (1)16x25x1* (1)16x25x1* Cleanable 21 (1)16x25x1 (1)20x25x1* Cleanable 24-1/2 (1 or 2) 16x25x1 (1)24x25x1* Cleanable AIR FILTER LOCATED IN FILTER CABINET FILTER CABINET HEIGHT (IN) FILTER SIZE (IN.) FILTER TYPE 16 (1) 16 x 25 x 1* or (1) 16 x 25 x 4-5/16 Cleanable Disposable 20 (1) 20 x 25 x 1* or (1) 20 x 25 x 4-5/16 Cleanable Disposable 24 (1) 24 x 25 x 1* or (1) 24 x 25 x 4-5/16 Cleanable Disposable DOWNFLOW/HORIZONTAL FURNACE FILTER TABLE FURNACE CASING WIDTH FILTER SIZE FILTER TYPE 14-3/16 (2)16x20x1* Cleanable 17-1/2 (2)16x20x1* Cleanable 21 (2)16x20x1* Cleanable 24-1/2 (2) 16x20x1* Cleanable * Factory provided with the furnace. Filters may be field modified by cutting filter material and support rods (3) in filters. Alternate sizes and additional filters may be ordered from your dealer. CAUTION! Use care when cutting support rods in filters to protect against flying pieces and sharp rod ends. Wear safety glasses, gloves, and appropriate protective clothing. Failure to follow this caution could result in personal injury. COMBUSTION AREA AND VENT SYSTEM 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. If your furnace makes a loud noise when the main burners are ignited, shut down the fur- nace—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 the electrical supply to the furnace and remove the access doors. (See Fig. 9 and 10, or 11.) 2. Carefully inspect the gas burner (see Fig. 29) for dirt, rust, or scale. Then inspect the relief box, flue 7 connection area, and the vent pipe for rust. 29 NOTE: If dirt, rust, soot, or scale accumulations are found, call your servicing dealer. DO NOT OPERATE THE FURNACE. 3. Inspect the vent pipe for a sag, holes, or a disconnection. A horizontal vent pipe must slope upward. If rusty joints or seams, or signs of water leakages are found call your dealer for service. WARNING! 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. A failure to follow this warning could result in personal injury or death. 4. Replace the access doors and restore electrical power to the furnace. Be sure bottom door flange is inside of the furnace casing. (See Fig. 16, 17, and 26.) 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 servicing dealer. 30 31 32 33 35 BEFORE YOU REQUEST A “SERVICE CALL” BEFORE YOU CALL FOR SERVICE, CHECK FOR SEVERAL EASILY SOLVED PROBLEMS: • Check 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, call your servicing dealer. If your furnace isn’t operating at all, check the following list for easily solved problems: • Is your thermostat set above room temperature? Is the HEAT mode selected? • Is 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 board.) Has a circuit breaker tripped? • Is the manual shutoff valve in ...

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