15
Annual Furnace Inspection
1. The duct furnace should be inspected annually by a qualified service agency. The condition of the burners,
heat exchanger, draft inducer, vent system, operating controls and wiring should be determined. Check for
obvious signs of deterioration, accumulation of dirt and debris and any heat or water related damage. Any
damaged or deteriorated parts should be replaced before the unit is put back into service.
2. Clean burners, heat exchanger, induced draft fan and vent ducts as outlined on Page 13.
3. Check Heat Exchanger for cracks. If any are present, replace heat exchanger before putting unit back into
service.
4. Check the attachment point of the duct furnace to the cabinet to verify that they are airtight.
5. Check the automatic gas valve to ensure that the gas valve seat is not leaking
6. Check wiring connections to be sure they are secure and inspect wiring for any deterioration.
7. Label all wires prior to disconnection when servicing unit. Wiring errors can cause improper or dangerous
operation. Verify proper operation after servicing.
Duct Furnace Operation Check
1. Prior to heating season, perform annual inspection and verify proper operation.
2. Turn on power to the unit and set thermostat or heat controller to call for heat, allowing duct furnace to
operate.
3. Check for proper start-up and ignition as outlined in Start-up on Page 11.
4. Check the appearance of the burner flame (See Figure 11A and 11B on Page 13).
5. Be sure circulating air fan is operating and verify proper airflow through duct furnace
6. Return thermostat or heat controller to normal setting.
If any of the original wiring needs to be replaced it must
be replaced with wiring materials suitable for 105
o
C.
CAUTION!
