Disconnect ALL power before servicing.
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 block adequate combustion air and a keep
the vent system from operating properly.
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 2 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
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 inspected
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 lubricated. 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 gently cleaning the
flame sensor with steel wool.
NOTE: After cleaning, the microamp signal should be stable and
in the range of 4 to 6 microamps DC.
Flue Passages—Qualified Servicer Only
At the start of each heating season, inspect and, if necessary,
clean the unit flue passage.
Cleaning Flue Passages—Qualified Servicer Only
1. Disconnect the electric power and gas supply to the unit.
2. Remove the burner assembly by disconnecting the gas line
and removing the manifold bracket from the partition 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.
5. Slowly rotate the cable with the drill and insert it into one of
the primary heat exchanger tubes.
6. While reversing the drill, work the cable in and out several
times to obtain sufficient cleaning.
7. Use a large cable for the large tube, and then repeat the
operation with a small cable for the smaller tube. Repeat for
8. When all heat exchanger tubes have been cleaned, replace
the parts in the reverse order in which they were removed.
9. To reduce the chances of repeated fouling of the heat
exchanger, perform the steps listed in "Start-Up, Adjustments
Main Burner Flame—Qualified Servicer Only
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.
A. Flame sensor