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Service
ELECTRICAL SHOCK, FIRE, OR EXPLOSION
HAZARD.
Failure to follow safety warnings exactly could result in
dangerous 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 furnace.
When servicing controls, label all wires prior to
disconnecting. Take care to reconnect wires correctly.
Verify proper operation after servicing.
At the beginning of each heating season, a qualified
technician should check the system as follows:
Blower
Check the blower wheel for debris and clean if necessary.
The blower motors are pre-lubricated for extended bearing
life. No further lubrication is needed.
The blower access panel must be securely in place
when the blower and burners are operating. Gas fumes,
which could contain carbon monoxide, can be drawn
into living space resulting in personal injury or death.
Page 34 of 36
WARNING
WARNING
Filters
Filters are installed external to the unit. Filters should
be inspected monthly. Clean or replace the filters when
necessary to ensure that the furnace operates properly.
Replacement filters must be rated for high velocity airflow.
Table 1 lists recommended filter sizes.
Flue and Chimney
1.
Check flue pipe, chimney and all connections for
tightness and to make sure there is no blockage.
2.
Check unit for proper draft.
Electrical
1. Check all wiring for loose connections.
2.
Check for the correct voltage at the furnace (furnace
operating). Correct voltage is 120VAC ± 10%.
3.
Check amp draw on the blower motor with inner blower
panel in place.
Unit Nameplate___________ Actual_____________
Cleaning the Burners
NOTE: Use papers or protective covering in front of the
furnace during cleaning.
1. Turn off both electrical and gas power supplies to
furnace.
2.
Label the wires from gas valve, rollout switches,
primary limit switch and make-up box then disconnect
them.
3.
Disconnect gas supply piping. Remove the screw
securing the burner box cover and remove cover.
Remove the four screws securing the burner manifold
assembly to the vestibule panel and remove the
assembly from the unit.
4.
To clean burners, run a vacuum cleaner with a soft
brush attachment over the face of burners. Visually
inspect inside the burners and crossovers for any
blockage caused by foreign matter. Remove any
blockage. Figure 37 shows burner detail.
5.
Reinstall burner box, manifold assembly and burner
box cover.
6.
Re-install gas supply and turn on electrical power to
furnace.
Issue 2209
507330-03G / 31-5000662
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