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Contact your dealer for any required service. Electrical Controls and Wiring — Electrical controls are difficult to check without proper instrumentation; therefore, if there are any discrepancies in the operating cycle, contactyour dealer and request service. Refrigerant Circuit — The refrigerant circuit is difficultto check for leaks without the proper equipment; therefore, if inadequate cooling is suspected, contact your dealer forservice. Combustion Area and Vent System — The combustion area and vent system should be visually inspected before each heating season. The normal accumulation of dirt, soot, rust, and scale can result in loss of efficiency and improper performance if allowed to build up. Accumulation on theburner crossover tube can result in the burners firing out of normal time sequence. This delayed ignition is characterized by anespecially loud sound. If your unit makes an unusual or especially loud noisewhen the main burners are lit, shut down the heatingsection and call your dealer. Bodily injury or unit damagemay result. See Fig. 1 and 5 and proceed as follows to inspect the combustion area and power-venting system of your unit. 1. Turn off gas supply and then electrical power to your unit. 2. Open gas section access door. 3. Using a flashlight, carefully inspect the burner areas fordirt, soot, rust, or scale. If dirt, soot, rust, or scale accumulations are found, call your dealer and do not operate your heating section. Bodily injury or unit damage may result. 4. When you have completed your inspection, follow thestart-up procedures in this manual to restore your unit tooperation. 5. Observe unit heating operation, and watch the burnerflame core to see if it is bright blue. If you observe a suspected malfunction, or if the burner flame cores are notbright blue, call your dealer. See Fig. 6. NOTE: Burner flame cores that have a mixture of orange, yellow, or red flames together with the blue may not beburning gas efficiently. Your dealer may have to adjustthe air/gas mixture. 6. Replace gas section access panel. Unit Panels and Doors — After performing any maintenance or service on the unit, be sure all panels and doors aresecurely fastened in place to prevent rain from enteringunit cabinet and to prevent disruption of the correct unit airflow pattern. Fig. 5 — Typical Location of Access Panel Fig. 6 — Proper Flame Appearance 7 REGULAR DEALER MAINTENANCE In addition to the type of routine maintenance you might bewilling to perform, your unit should be inspected regularly by aproperly trained service technician. An inspection (preferablyeach year, but at least every other year) should include thefollowing: 1. Inspection of all flue product passages — including theburners, heat exchanger, flue collector box, and vent pipe. 2. Inspection of all combustion-air and ventilation-air passages and openings. 3. Close inspection of all gas pipes leading to and insideyour unit. 4. Adjustment of the air/gas mixture if the burner flames arenot bright blue. (See Fig. 5 and 6 for location of accesspanel and proper flame appearance.) 5. Inspection, and if required, cleaning of the condenser andevaporator coils. 6. Inspection, and if required, cleaning of the evaporatordrain pan. 7. Inspection, cleaning, and lubrication of blower wheelhousing and motor. 8. Inspection of all supply-air and return-air ducts for leaks, obstructions, and insulation integrity. Any problems found should be resolved at this time. 9. Inspection of the unit base to ensure that no cracks, gap...

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