Assessments - 3, GPA: 4.3
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(See Fig. 14,16, and 23.) 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. • DOWNFLOW/HORIZONTAL FURNACES ONLY: Two filters are located in the return-air plenum above the blower (above line-of-sight) resting in the V-shaped channel on top of the furnace. (See Fig. 24.) 1. Thrn OFF electrical supply to the furnace. (See Fig. 19.) 2. Remove blower access doors 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. 24 and 25.) 24 25 A88519 A88520 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 filter. If torn, replace the filter. 7. Wash the filter (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 through the crossmesh binding side. Allow filter to dry. 8. Reinstall the clean filters with the cross-mesh binding side facing the furnace blower. 9. Replace blower door (secure with 2 screws) and turn ON electrical power to your furnace. UPFLOW FURNACE FILTER TABLE FURNACE CASING WIDTH FILTER SIZE FILTER TYPE Side Return Bottom Return 14-3/16 (1) 16x25x1* (1) 14x25x1 Cleanable 17-1/2 (1) 16 x 25 x 1* (1) 16x25x1 Cleanable 21 (1) 16 x 25 x 1 (1) 20 x 25 x 1* Cleanable 24-1/2 (2) 16 x 25 x 1* (2) 12 x 25 x 1 Cleanable DOWNFLOW/HORIZONTAL FURNACE FILTER TABLE FURNACE CASING WIDTH FILTER SIZE FILTER TYPE 14-3/16 (2) 14 x 20 x 1* Cleanable 17-1/2 (2) 14 x 20 x 1* Cleanable 21 (2) 16 x 20 x 1* Cleanable 24-1/2 (2) 16 x 20 x 1* Cleanable *Factory provided with the furnace. Filters may be field modified by cutting and folding the frame as indicated on the filter. Alternate sizes and additional filters may be ordered from your dealer. 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 furnace—call your servicing dealer. Use your flashlight and follow these steps for inspecting the combustion area and vent system of your furnace: 1. Thrn 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. 26) for dirt, rust, or scale. Then, inspect the relief box, flue connection area, and the vent pipe for rust. 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. 7 A WARttiNG 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. 14, 15, and 23.) 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. 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 switch in the HEAT position? □ 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 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 right angles (closed)? NOTE: Before proceeding with the next checks, turn OFF the electrical power supply to the furnace. Remove the access doors. □ Is the control knob 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 startup procedures found on pages 4 and 5 of this booklet. □ If for some reason the vent is blocked, the draft safeguard switch will shut off th...
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