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Air
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ow
OUTDOOR
GRILLE
FRESH
OUTDOOR
AIR
FRESH
OUTDOOR
AIR
HOT
EXHAUST
AIR
OUTDOOR
WALL
WALL
CASE
RUBBER SEAL PRESSED
TIGHTLY AGAINST METAL
BRACKETS
OUTDOOR
GRILLE
OUTDOOR
WALL
WALL
CASE
RUBBER SEAL NOT
PRESSED AGAINST
METAL BRACKETS
Proper Outdoor Coil Air
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ow
When properly installed in the correct wall case, the rubber seals on the inside of the outdoor grille should
fi
t tightly against the metal brackets on the outdoor coil. This will prevent condenser hot exhaust air from
being recirculated through the coil, and will allow fresh outdoor air to enter from each of the rear sides of
the outdoor grille. The outdoor fan motor and grille work together to provide proper air
fl
ow. The fan motor
draws air in through each side of the outdoor grille, and the air is then blown out through the condenser
coil, and discharged to the outside. When sliding the chassis back into the case, it is very important to slide
the chassis all the way into the case for proper air
fl
ow. It is also important to have the proper outdoor grille
installed on the case.
Improper Outdoor Coil Air
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ow
(Recirculating Hot Exhaust Air)
When improperly installed, the rubber seals on the inside of the outdoor grille do not
fi
t against the metal
brackets on the outdoor coil. This allows hot outdoor coil exhaust air to recirculate across the compressor
and outdoor coil. When this condition occurs, the compressor overheats and eventually cycles off on the
compressor overload protector (compressor shuts off). After the compressor cools, it restarts and the cycle
repeats itself. If this installation problem is not corrected, damage to the compressor can occur.
