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Install with airflow direction arrow pointing towards blower. 25 26 27 29 8 31 32 b) Electronic air cleaner (EAC) – Refer to EAC Owner’s Manual for maintenance information. 5. If washable filter, wash filter (if dirty) in 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 filter in the opposite direction of airflow. Allow filter to dry. 6. Reinstall clean air filter 7. Reinstall filter retainer (for blower compartment locations only) 8. Replace blower access panel and main furnace door (See Fig. 35 and 36.) or filter cabinet door (Fig. 37 and 38.) 9. Turn on electrical supply to furnace. If your furnace air filter needs to be replaced, be sure to use a factory-authorized filter of the same size that was orginally supplied. Use the filter tables and compare your furnace size with the proper filter size. 33 34 35 36 37 38 FURNACE AIR FILTER TABLE AIR FILTER LOCATED IN BLOWER COMPARTMENT FURNACE CASING WIDTH (IN.) FILTER SIZE (IN) FILTER TYPESide Return†* Bottom Return* 17-1/2 (1) 16 x 25 x 1 (1) 16 x 25 x 1 Cleanable 21 (1) 16 x 25 x 1 (1) 20 x 25 x 1 Cleanable 24-1/2 (1 or 2) 16 x 25 x 1 (1) 24 x 25 x 1 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 or Disposable 20 (1) 20 x 25 x 1* or (1) 20 x 25 x 4-5/16 Cleanable or Disposable 24 (1) 24 x 25 x 1* or (1) 24 x 25 x 4-5/16 Cleanable or Disposable * Factory-provided with the furnace. Filters may be field modified by cutting- filter material and support rods (3) in filters. † Upflow only. Alternate sizes and additional filters may be ordered from your dealer. WARNING! PERSONAL INJURY HAZARD Failure to follow this warning could result in personal injury. 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. COMBUSTION AREA AND VENT SYSTEM Visually inspect the combustion area and vent system before each heating season. Make sure that all PVC pipes leading into the combustion area and vent are free from any cracks and sags. WARNING! CARBON MONOXIDE POISONING HAZARD Failure to follow this warning could result in personal injury or death. If holes are found in the pipes or if any portion has become disconnected, toxic fumes can escape into your home. DO NOT OPERATE YOUR FURNACE. Call your dealer for service. 9 Check the combustion-air intake and vent pipe on the outside of your home for blockage. When dirt, soot, scale, or rust is allowed to build up, your furnace can suffer a loss of efficiency and perform improperly. Accumulations on the main burners can result in firing out of normal sequence. This delayed ignition creates an alarmingly loud sound. CAUTION! UNIT OPERATION HAZARD Failure to follow this caution may result in minor property damage. If your furnace makes an especially loud noise when the main burners light, shut down your furnace and call your dealer. To inspect the combustion area and vent system, you will need a flashlight. Refer to Fig. 3 or 4, and proceed as follows: 1. Turn off the gas and electrical supplies to the furnace and remove the main furnace door. (See Fig. 11, 12, and 13.) 2. Remove burner enclosure front. (See Fig. 39 or 40.) Inspect the gas burners, igniter area, and remainder of furnace for dirt, rust, soot, or scale. 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 combustion-air and vent PVC pipes for sags, holes, cracks, water leaks, blockage or disconnections. Horizontal portions of pipes must slope downward toward furnace. HEADING SOUTH FOR THE WINTER? DON’T FORGET YOUR FURNACE! CAUTION! UNIT AND PROPERTY DAMAGE HAZARD Failure to follow this caution may result in damage to the furnace and other property damage. If the furnace is installed in an unconditioned space where the ambient temperatures may be 32°F or lower, freeze protection measures must be taken to prevent minor property or product damage. Since the furnace uses a condensing heat exchanger, some water will accumulate in the unit as a result of the heat transfer process. Therefore, once it has been operated, it cannot be turned off and left off for an extended period of time when temperatures will reach 32°F or lower unless winterized. Follow these procedures to winterize your furnace: 1. Obtain propylene glycol (RV/swimming pool antifreeze or equivalent). CAUTION! UNIT COMPONENT DAMAGE HAZARD Failure to follow this caution may result in damage to the furnace and other property damage. Do not use ethylene glycol (Prestone II antifreeze coolant or equivalent). Failure of plastic components may occur. 2. Turn off electrical supply to the furnace. (See Fig. 22.) 3. Remove main furna...

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