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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 finishes 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 carefully cleaning the
flame sensor with steel wool.
NOTE: After cleaning, the microamp signal should be stable and
in the range of 5-10 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.
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 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.
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, Adjustments,
and Checks".
Burners
The Ultra low NOx models are equipped with premix burner. The
burner box is sealed to achieve safe and reliable operation. The
burner box should not have any blockage near the air-gas mixer
inlet.
For further information on the yearly inspection, consult the User
Manual. It is recommended that a qualified servicer inspect and
service the unit at least once each year.
Turn the unit on at the thermostat. Wait a few minutes, since any
dislodged dust will alter the normal flame appearance. Flames
should be predominantly blue and directed into the tubes. They
should not be yellow. They should extend directly outward from
the burner ports without curling downward, floating or lifting off the
ports.
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