16
XII. Maintenance
WARNING
To avoid death or personal injury due to
electrical shock, disconnect electrical
power before performing any mainte-
nance.
Important Note: Touching the ignitor body with bare
fingers, rough handling, or vibration could result in early
ignitor failure. Only a qualified servicer should ever
handle the ignitor.
Have the gas heating section of the unit checked at
least once a year before the heating season begins, to
be sure that the combustion air inlet and flue outlet
hoods are not blocked by debris, which would prevent
adequate combustion air and a properly operating vent
system.
Replacing Or Cleaning Filter
A return air filter is not supplied with this unit; however,
there must be a means of filtering all of the return air.
The filter(s) may be located in the return air duct(s),
return air filter grille(s). Consult with your installing dealer
for the actual location of the return air filter(s) for your
unit.
Dirty filters are the most common cause of inadequate
heating or cooling performance. Filter inspection should
be made at least every two months; more often if nec-
essary because of local conditions and usage.
Dirty throwaway filters should be discarded and re-
placed with a new, clean filter. Dirty permanent filters
should be washed with water, thoroughly dried and
sprayed with a filter adhesive before being reinstalled.
(Filter adhesives may be found at many hardware
stores.) Permanent filters should last several years.
However, should one become torn or uncleanable, it
should be replaced.
Maintaining Cabinet Finish
Use a fine grade automotive wax on the cabinet finish to
maintain the finish’s original high luster. This is espe-
cially important in area’s with high ultraviolet radiation.
Clean Outside Coil (Qualified Servicer
Only)
The coil with the outside air flowing over it should be
inspected annually and cleaned as frequently as neces-
sary to keep the finned areas free of lint, hair and
debris.
Condenser, Evaporator, and Induced Draft
Motors
Bearings on the air circulating blower motor, condenser
motor and the combustion fan motor are permanently
lubricated. No additional oiling is required.
Flame Sensor (Qualified Servicer Only)
A drop in the flame sensing signal can be caused by a
nearly invisible coating on the flame sensor. This coat-
ing, created by the fuel or combustion air supply, can be
removed by carefully cleaning the flame sensor with
emery cloth or steel wool. (Figure 14)
NOTE: After cleaning, the microamp signal should be in
the range listed in Specification Sheet.
Burner
Assembly
Pilot
Tube
Flame Sensor
Ignitor
Figure 14
Ignitor and Flame Sensor
Flue Passages (Qualified Servicer Only)
At the start of each heating session, inspect and, if
necessary, clean the unit flue passage