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CAUTION
Every application may require a dierent frequency of
replacement of dirty lters. Filters must be replaced at least
every three (3) months during operating seasons.
Dirty lters 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 lters should be discarded and replaced
with a new, clean lter.
Disposable return air lters are supplied with this unit. See
the unit Specication Sheet or Technical Manual for the
correct size and part number. To remove the lters, remove
the lter access panel on return side of the unit.
Use a ne grade automotive wax on the cabinet nish to
maintain the nish’s original high luster. This is especially
important in installations with extended periods of direct
sunlight.
The coil with the outside air owing over it should be
inspected annually and cleaned as frequently as necessary
to keep the nned areas free of lint, hair and debris. Clean
coil from inside out.
Bearings on the condenser fan motors and the combustion
fan motor are permanently lubricated. No additional oiling
is required.
A drop in the ame current can be caused by a nearly
invisible coating on the ame sensor. This coating, created
by the fuel or combustion air supply, can be removed by
carefully cleaning the ame sensor with steel wool.
At the start of each heating season, inspect and, if
necessary, clean the unit ue passage.
CAUTION
Preventive maintenance is the best way to avoid
unnecessary expense and inconvenience. Have this
system inspected at regular intervals by qualied service
personnel, at least twice a year. Routine maintenance
should cover the following items:
1. Tighten all set screws, and wire connections.
2. Clean evaporator and condenser coils mechanically
or with cold water, if necessary. Usually any fouling
is only matted on the entering air face of the coil and
can be removed by brushing.
3. Replace lters as needed (see Filters section).
4. Check for blockage of condensate drain.
5. Check power and control voltages.
6. Check running amperage.
7. Check operating temperatures and pressures.
8. Check and adjust temperature and pressure controls.
9. Check and adjust damper linkages.
10. Check operation of all safety controls.
11. Examine gas furnaces (see below and the User’s
Information Manual).
12. Check condenser fans and tighten set screws.
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