If the furnace continues to lock out, a qualified service techni- cian should be called to determine the cause of the problem.
ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in dan- gerous operation, serious injury, death or property damage.
Improper servicing could result in dangerous operation, serious injury, death or property damage.
•Before servicing, disconnect all electrical power to fur- nace.
•When servicing controls, label all wires prior to discon- necting. Reconnect wires correctly.
•Verify proper operation after servicing.
Prior to any of the following maintenance procedures, shut off all power to the unit, to avoid personal injury.
EXPLAIN UNIT FUNCTION
When the system is functioning properly, show the owner the location of all disconnect switches and the thermostat. Explain how to start and stop the unit and how to adjust tem- perature settings within the limitations of the system. Advise that the flue exhaust hood surface and the immediate area will experience high temperatures during the heating cycle, and that all unauthorized personnel and debris must be kept away from this area.
GENERAL MAINTENANCE
In order to insure long and trouble free service from your sys- tem, we recommend periodic inspection, cleaning, lubrication and adjustment by your installing Dealer/Contractor. Be sure to ask about this service. For those who prefer to
Snow or debris should not be allowed to accumulate in or around the unit. Do not permit overhanging structures or shrubs to obstruct outdoor air discharge, combustion air inlets or vent outlets on your unit. These provide air for com-
bustion and ventilation. Adequate air is important to the safe and proper operation of the unit.
HEATING SYSTEM INSPECTION
It is the owner's responsibility to insure that an annual inspec- tion of the entire heating portion of the unit is made by a qual- ified service technician. This should include inspection of the burner, heating element and flue for any corrosion or soot accumulation which may require cleaning and also checking of burner and controls for proper operation.
In addition, at least once during the heating season, the owner shall make a visual inspection of the flue outlet for evi- dence of black soot or blockage of flue outlet by leaves or other debris. If any soot is found, it is recommended a quali- fied service technician be called immediately. If any blockage is found, it must be cleared immediately.
Check for obvious signs of deterioration of the unit. Check that the return and supply ducts attached to the unit are sound and air tight. Check that the unit's physical support, concrete slab or roof curb, is sound and not in need of repair. Make sure there are no gaps between the roof curb and the unit where rain could leak into the building.
Start the furnace. The vent motor should start, the igniter will start to spark and ignite the pilot flame. After a short delay the main burner should ignite. If it does not, contact a qualified ser- vice technician for assistance. Check the appearance of the main burner flame. Adjust burner shutters so no yellow flame is observed in the heat exchanger tubes. (See Figure 3.) If flame adjustment cannot be made, obtain the assistance of a quali- fied service technician and refer to the PILOT CHECKOUT and BURNER AIR SHUTTER ADJUSTMENT sections in the
UNIT INSTALLATION INSTRUCTION.
FIGURE 3 - TYPICAL FLAME APPEARANCE
BURNER AND PILOT CHECK
Periodically (at least annually at the beginning of each heat- ing season) make a visual check of the pilot and main burner flame. If necessary, adjust main burner primary air shutters to give a distinct, sharp blue flame as explained under BURNER AIR SHUTTER ADJUSTMENT. If it is not possible to adjust for the proper flame, the burners may need cleaning.
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