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MAINTENANCE
HIGH VOLTAGE!
Disconnect all power before servicing or
installing this unit. Multiple power sources
may be present. Failure to do so may cause
property damage, personal injury or death.
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 combus-
tion air and a properly operating vent system.
Filter Replacement or Cleaning
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), or 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 necessary
because of local conditions and usage.
Dirty throwaway filters should be discarded and replaced
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.
Cabinet Finish Maintenance
Use a fine grade automotive wax on the cabinet finish to
maintain the finish's original high luster. This is especially
important in installations with extended periods of direct
sunlight.
Clean Outside Coil (Qualified Servicer Only)
The coil with the outside air flowing over it should be in-
spected annually and cleaned as frequently as necessary
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 lubri-
cated. No additional oiling is required.
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.
WARNING
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 neces-
sary, clean the unit flue passage.
Cleaning Flue Passages (Qualified Servicer Only)
1. Shut off electric power and gas supply to the unit.
2. Remove burner assembly by disconnecting the gas
line and removing the manifold bracket from the parti-
tion panel.
3. Remove the flue from the induced draft blower and
the collector box cover from the partition panel.
4. The primary heat exchanger tubes can be cleaned
using a round wire brush attached to a length of high
grade stainless steel cable, such as drain cleanout
cable. Attach a variable speed reversible drill to the
other end of the spring cable. Slowly rotate the cable
with the drill and insert it into one of the primary heat
exchanger tubes. While reversing the drill, work the
cable in and out several times to obtain sufficient
cleaning. Use a large cable for the large tube, and
then repeat the operation with a small cable for the
smaller tube. Repeat for each tube.
5. When all heat exchanger tubes have been cleaned,
replace the parts in the reverse order in which they
were removed.
6. To reduce the chances of repeated fouling of the heat
exchanger, perform the steps listed in "Startup, Adjust-
ments, and Checks".
Main Burner Flame (Qualified Servicer Only)
Flames should be stable, soft and blue (dust may cause or-
ange tips but must not be yellow). The flames must extend
directly outward from the burner without curling, floating or
lifting off.
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.
21
Flame
Sensor
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