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5. Move the switch on the gas valves to the OFF positionand wait 5 minutes before doing any service in the sectionor on the piping. 6. Close the burner section hinged access door. 7. If unit is being shut down because of a malfunction, call your dealer as soon as possible. If unit is being shut down because the heating season hasended, restore electrical power to the unit and reset thescrolling marquee to Run mode to ensure operation of thecooling system during the cooling season. IMPORTANT: Should overheating occur or the gas supplyfail to shut off, shut off the manual gas valve to the unitbefore shutting off the electrical supply. For your safety, keep the gas heating area clear and free ofcombustible materials, gasoline, and other flammable liquidsand vapors. To ensure proper functioning of the unit, flow of combustion and ventilating air must not be obstructed from reachingthe gas heating area. Clearance of at least 4 ft on all sides isrequired. ROUTINE MAINTENANCE AND CARE FOR THE EQUIPMENT OWNER Before proceeding with those things you might want tomaintain yourself, please carefully consider the following: 1. TURN OFF GAS SUPPLY FIRST AND THEN ELECTRICAL POWER TO YOUR UNIT BEFORE SERVICING OR PERFORMING MAINTENANCE. 2. Do not turn off electrical power to this unit withoutfirst turning off the gas supply. 3. When opening access doors or performing maintenance functions inside your unit, be aware of sharpsheet metal parts and screws. Although special carehas been taken to reduce sharp edges to a minimum, be extremely careful when handling parts or reachinginto the unit. Failure to follow these procedures can result in serious fireor personal injury. Air Filters — Air filters should be checked at least every3 or 4 weeks and changed or cleaned whenever they becomedirty. Table 1 indicates the correct filter size for your unit. Openthe hinged filter access door to replace or inspect the filters. Allunits have filter tracks into which the filters slide. Remove the filters by pulling outward from the track. See Fig. 4 for filteraccess door location. Note the direction of flow arrows on the filter frame. If you have difficulty in locating your air filter in the return- air duct system, or if you have questions concerning properfilter maintenance, contact your dealer for instructions. Table 1 — Indoor-Air Filter Data* UNIT SIZE 48Z FILTER TYPE QUANTITY...Size (in.) Disposable Fiberglass (Standard) or Medium Efficiency 30% Pleated (Optional) 8...20 x 25 x 2, 8...20 x 20 x 2 030-050 90% Bag (Optional) with High- Velocity Pre-Filters 6...20 x 24 x 22, 6...20 x 20 x 22, 12...16 x 20 x 2, 3...20 x 24 x 2 Disposable Fiberglass (Standard) or Medium Efficiency 30% Pleated (Optional) 12...20 x 25 x 2, 12...20 x 25 x 2 055-070 90% Bag (Optional) with High- Velocity Pre-Filters 6...24 x 20 x 22, 6...24 x 24 x 22, 6...20 x 24 x 2, 6...24 x 24 x 2 075 Disposable Fiberglass (Standard) or Medium Efficiency 30% Pleated (Optional) 12...20 x 25 x 2, 12...20 x 20 x 2 High Efficiency 65% Pleated (Optional) 12...20 x 25 x 2, 12...20 x 20 x 2 090,105 Disposable Fiberglass (Standard) or Medium Efficiency 30% Pleated (Optional) 12...20 x 25 x 2, 12...20 x 20 x 2 High Efficiency 65% Pleated (Optional) 12...20 x 25 x 2, 12...20 x 20 x 2 Do not use this unit if any part has been under water. Immediately call a qualified service technician to inspect the unit andto replace any part of the control system and gas control thathas been under water. MAINTAINING YOUR UNIT All maintenance should be handl...

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