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I-EEDU (02-21) 150492-A
ADJUSTMENTS—CONTINUED
Burner Air Adjustment (Propane Units Only)—Continued
This duct furnace has individually-formed steel burners with accurately die-formed ports to provide controlled
flame stability with either natural gas or propane without lifting or flashback . The burners are lightweight and are
factory-mounted in an assembly that permits them to be removed as a unit for inspection or service . All burners are
equipped with two flash carryover systems that receive a supply of gas simultaneously with the main burner . Burner
air shutters are not normally required on natural gas furnaces . Air shutters are supplied on propane gas units and
may require adjustment as follows:
1 . Operate heater for about 15 minutes with air shutters open .
NOTE: When making the adjustment, close the air shutters no more than is necessary to eliminate
the problem condition.
2 . Turn slotted screw that moves air shutters and adjusts all burners simultaneously on end manifold bracket—clockwise
to open shutters or counterclockwise to close shutters . Close air shutters and observe flame for yellow-tipping .
NOTE: A limited amount of yellow-tipping is permissible for propane gas. Other fuels should not
display any yellow-tipping.
3 . Open air shutters until yellow disappears .
MAINTENANCE
⚠ WARNING ⚠
If you turn OFF the electrical power supply, turn OFF the gas.
The unit is designed to operate with a minimum of maintenance . However, to ensure long life and satisfactory
performance, routine service is recommended . When servicing, follow standard safety procedures and those specific
instructions and warnings in this manual .
Service Checklist
⚠ CAUTION ⚠
Eye protection is recommended when cleaning unit.
Under normal conditions, inspect furnaces at beginning of each heating season and once every 4 months . If
furnace is located where an unusual amount of dust, soot, or other impurities are contained in the air, more
frequent inspection is recommended .
Clean heat exchanger inside and out (annually at minimum) .
Clean all dirt and grease from combustion air openings (annually at minimum) .
Check combination gas valve to ensure that gas flow is being shut off completely (annually at minimum) .
Check pilot burner and main burners for scale, dust, or lint accumulation and clean as necessary (annually at
minimum) .
Check soundness of vent system and replace parts as necessary (annually at minimum) .
Check wiring for damage and replace as necessary (annually at minimum) .
Maintenance Procedures
⚠ CAUTION ⚠
Use only factory-authorized replacement parts.
