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SCHEDULED MAINTENANCE
Flame Sensor (Qualified Servicer Only)
A drop in the flame current can be caused by a nearly
invisible coating on the flame sensor. This coating, created
by the fuel or combustion air supply, can be removed by
carefully cleaning the flame sensor with steel wool.
NOTE: After cleaning, the microamp signal should be
stable and in the range of 4 - 6 microamps DC.
Flue Passages (Qualified Servicer Only)
At the start of each heating season, inspect and, if
necessary, clean the unit flue passage.
Lubrication
The fan shaft bearings, the supply fan motors, the
condenser fan motors and compressors are permanently
lubricated.
Inspection & Cleaning
All flue product carrying areas of the furnace, its vent
system, and main burners should be examined by a
qualified service agency, and cleaned if necessary, before
the start of each heating season. This examination
is necessary for continued safe operation. Particular
attention should be given to deterioration from corrosion
or other sources. This examination is accomplished in the
following manner.
1. Disconnect power to the unit and remove furnace
section access panel.
2. Remove burner assembly:
A. Disconnect the wires from the gas valve after
noting which wires are connected to each
terminal.
B. Disconnect wires from the flame rod and ignition
electrode.
C. Disconnect the gas piping at the union.
D. The entire burner assembly can now be removed
from the unit.
NOTE: Use all screws that were removed; they are
necessary for safe and proper operation of the unit.
3. Inspect and periodically clean the vent outlet (bird
screen) on the access panel.
NOTE: Periodic observation of the flame and a log of
C0
2
measurements are recommended. This will aid in
determining whether the furnace is operating efficiently
or if the furnace requires cleaning.
Flames should be stable, soft and blue (dust may cause
orange tips but must not be yellow). The flames must
extend directly outward from the burner without curling,
floating or lifting off.
Check the burner flames for:
1. Good adjustment
2. Stable, soft and blue
3. Not curling, floating, or lifting off.
burner flame
WARNING
To avoid personal injury or death due to electric shock,
do not remove any internal compartment covers or
attempt any adjustment. Contact a qualified servicer at
once if an abnormal flame should develop.
At least once a year, prior to or during the heating season,
make a visual check of the burner flames.
NOTE: This will involve removing and reinstalling the heat
exchanger door on the unit, which is held by two screws.
If you are uncertain about your ability to do this, contact
a qualified servicer.
If a strong wind is blowing, it may alter the airflow pattern
within the unit enough that an inspection of the burner
flames is not possible.
Functional Parts
Refer to the unit Parts Catalog for a list of functional parts.
Parts are available from your distributor.
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