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.

Your combination heating/cooling rooftop unit is equippedwith an automatic direct spark ignition system and induced- draft power combustion blower. WARNING: If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life. — Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. — WHAT TO DO IF YOU SMELL GAS • Do not try to light any appliance. • Do not to

Catalog No. 04-53480045-01 Printed in U.S.A. Form 48Z-5SO Pg 1 7-07 Replaces: 48Z-3SO Book Tab 1a NOTE: High heat consists of sections 1 and 2. Low heat consists NOTE: High heat consists of sections 1-3. Low heat consists of of section 1 only. sections 1 and 2 only. 030-050 SIZES 055-105 SIZES Fig. 1 — Heat Section Details 10. Using the scrolling marquee, enable the unit to run usingthe following procedure: a. Push the is shown. b. Push the lit. c. Push the STOP. d. Push the ESCAPE ENTER ENTER w

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: Sho

Your dealer can help you establish a standard procedure. *See base unit Installation Instructions if field-supplied or optional factory-supplied filters are used. When replacing filters, always use the same type and size originally supplied. 4 When replacing your unit filters, always use the same sizeand type of filter that was originally supplied by the installer. Units with outdoor air capability have a cleanable filter forthe outdoor air. This filter should be checked annually andcleaned as n

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