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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. 5. 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 — 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. 4 and 5 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, gaps, etc., exist which may cause a hazardous condition. 10. Inspection of the unit casing for signs of deterioration. 11. Inspection of all electrical wiring and components toassure proper connection. 12. Inspection for leaks in the refrigerant circuit. Pressure- check to determine appropriate refrigerant charge. 13. Operational check of the unit to determine working conditions. Repair or adjustment should be made at this time. 14. Your servicing dealer may offer an economical servicecontract that covers seasonal inspections. Ask for furtherdetails. Complete Service Instructions can be found in the base unitControls, Start-Up, Operation, Service and Troubleshootingliterature. BEFORE YOU CALL FOR SERVICE, CHECK FOR SEVERAL EASILY SOLVED PROBLEMS If insufficient heat or cooling is suspected: ( ) Check for sufficient airflow. Check the air filters for dirt. Check for blocked return-air or supply-air grilles. Be sure they are open and unobstructed. Be sure heating and cooling set points are correct. If these checks do not reveal the cause, call your servicing dealer. If your unit is not operating at all, check the following list for easy solutions: ( ) Check to be sure that heating temperature set point is set above the indoor temperature during the heating season, or that cooling temperature set point is below the indoor temperature during the cooling season. Be sure the unit on/off switch is in the ON position and not in the OFF position. Be sure unit has been programmed with the appropriate time schedules and desired operating set points. ( ) Is the electrical supply switch ON? Are any fuses blown, or have any of the circuit breakers tripped? ( ) During the heating season, check the manual shutoff valve. Is this lever parallel with the pipe, indicating that the valve is open? Or is the lever at a right angle, indicating that the valve is closed? If closed, has the gas been shut off for safety reasons? Otherwise, you may open the valve and follow the start-up procedures listed in this manual. NOTE: Before proceeding with the next check, turn OFF the electrical power supply to the unit. Open the control access door. ( ) During the heating season, check the control switch on the gas valve. It is in the ON position? If it is not, be sure it has not been turned off for the purpose of safety. Follow the startup procedures in this manual. ( ) If your unit still fails to operate, call your servicing dealer for troubleshooting and repairs. Specify the model and serial numbers of your unit. (Record them in this manual in the space provided.) If the dealer knows exactly which unit you have, he may be able to offer suggestions over the phone, or save valuable time through knowledgeable preparation for the service call. IN CASE OF TROUBLE If, after performing the above, unit performance is unsatisfactory, shut off the unit and call your dealer. Dealer’s Name _____________________________________ Telephone No. _____________________________________ Unit Model ________________________________________ Unit Serial Number _________________________________ Unit Address _____________________________________...

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