14
During the cooling season, if the airflow is
reduced due to dirty air filters or any other
reason, the cooling coils can get too cold
which can cause excessive liquid to return to
the compressor. As the liquid concentration
builds up, oil is washed out of the
compressor, leaving it starved for
lubrication.
The compressor life will be seriously
shortened by reduced lubrication and the
pumping of excessive amounts of liquid oil
and refrigerant.
Wiring Diagrams
Unit specific wiring diagrams are affixed
inside the control compartment panel.
Installation
AAON equipment has been designed for
quick and easy installation.
Before startup of the unit, check the supply
blower and remove the foam shipping block
that may be included to support the blower
assembly before installation, or damage may
occur.
Figure 2 - Foam Shipping Block
Locating the Unit
Placement of the unit relative to ductwork,
electrical and plumbing must be carefully
considered. Supply and return air plenum or
duct can be mounted directly to the duct
connection flanges. Use a properly sized
duct transition to connect supply duct to unit
supply air opening. Return duct flanges are
only included on units with the optional 4-
sided filter rack. Use flexible gasket material
to seal the duct to the unit.
Verify ceiling, floor, or foundation can
support the total unit weight, including
accessory weights.
To properly support the horizontal WSHP
unit and reduce sound and vibration, it must
be mounted level in both horizontal
directions. These units are designed to be
suspended via threaded rod (field provided)
through all four hanger brackets using the
four (4) vibration grommets (factory
provided) and 3/8” washers (field provided)
and as shown in Figure 3.
Figure 3 - Mounting Horizontal Units
Vibration grommets are factory provided
and must be field installed on units 6 tons
and larger.
(Field Provided)
3/8” Washer
(Field Provided)
Grommet
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