AAON V3-A Installation, Operation & Maintenance Instructions Manual page 66

Furnace Inspection
Turn off all electrical power to the unit
before inspection and servicing.
1. The 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 draft inducer and vent ducts with a
soft brush or vacuum.
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 furnace
to the cabinet or ducts to verify that they are
air tight.
5. Check the automatic gas valve to insure
that the gas valve seat is not leaking.
6. Inspect and clean condensate drain trap(s).
7. If condensate neutralizer tube is installed,
recharge per instructions.
8. Inspect and clean secondary coil fins.
9. Check wiring connections to be sure they
are secure and inspect wiring for any
deterioration.
10. Label all wires prior to disconnection
when servicing unit. Wiring errors can cause
improper or dangerous operation. Verify
proper operation after servicing.
66
Furnace Operation Check
1. Turn on power to the unit and set
thermostat or heat controller to call for heat,
allowing furnace to operate.
2. Check for proper start-up and ignition as
outlined in Start-Up section.
3. Check the appearance of the burner flame.
4. Check that the circulating air fan is
operating and verify the proper airflow
through furnace.
5. Verify proper flow of condensate from
drain system.
6. Return thermostat or heat controller to
normal setting.