4
Maintenance
WARNING
ELECTRICAL SHOCK, FIRE, OR EXPLOSION
HAZARD.
Before performing any maintenance, power to unit must
be off at the unit disconnect switch.
IMPORTANT
Use a clean, dry cloth to wipe the wireless remote con-
trol. Never use a damp or wet cloth to clean the wireless
remote control.
Use a clean, dry cloth to wipe the indoor unit. If
necessary, dampened cloth may be used.
Do not use a chemically treated dust cloth on either the
indoor unit or wireless remote control.
Do not use benzene, paint thinner, polishing powder
or similar products to clean the indoor unit or control.
These substances may cause the plastic surface to
crack or become dam aged.
Return Air Filters
Blocked or dirty return air lters affect system oper ation
and efciency. Air lters should be checked monthly in
order to ensure proper air ow to the in door unit. It may be
necessary to check the lter more frequently if the unit is
installed in an area with a large amount of dust.
The lter may be removed and cleaned, or it should be
replaced with a lter of like kind and size if it is impossible
to clean the lter. See “Figure 1. Parts Arrangement” on
page 2 to locate the lter in your indoor unit.
Filters are accessed through the re turn air grille as shown
in the illustration which fol lows.
Typical Filter Removal
Pivot hinged grille downward
Lift filter up and out to remove
it from the unit.
The filter may be cleaned using either a
vacuum cleaner or with clean water.
Filter Cleaning
Filter should be held
with the air entering side
face up when using a
vacuum cleaner.
The filter should be held with
the air entering side face down
when using clean water to wash
the filter.
Filter should be set aside to air
dry after cleaning. Do not
place filter in direct sunlight
or use any type of heat to dry
the filter.
NOTE - If filter is extremely
dirty, it may be necessary to
tergent for cleaning. Filter must
be thoroughly rinsed and dried.
Spigot or
water hose
Vacuum
cleaner
Filter
M22A and M33C Ceiling-Mounted Cassettes
Simultaneously press two
latch relese buttons (M33C)
or slide grille release latches toward
the middle as shown (M22A)
Figure 6. M22A and M33C Typical Filter Removal
and Cleaning
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