5
APPLICATI ON CONSIDERATIONS
Installation instructions are shipped with all PTAC
units. It is important that air conditioning systems be
prop erl y s i zed and in s t al l ed for each app l i cat i on in
orderto achieve the desiredtemperature and humidity
levels within the space to be conditioned. It is
strongly recommended that a professional engineer
match the PTAC units with the building structure and
climate.
The following application considerations are all
important in choosing the proper PTAC system for
the building structure.
Undersizing
If a PTAC unit i s undersized (cooling capacity is less
than required capacity for an application), the unit
will not be able to cool the space down to the desired
temperature during very hot days. The result could be
warm and h um i d o r warm an d d ry co nd it i o ned space.
Oversizing
If a P TAC unit is oversized (cooling capacity is
great er th an req ui red cap aci t y fo r th e sp eci fi c
application), t he unit will cool the space down to the
desired temperature too quickly.
The unit will cycle on and off, however,
dehumidification only takes place when the unit is
operating. The result of this type of application in a
hot and/or humid climate would be a cool, yet
excess i v el y h u m i d, sp ace.
Air Infiltration
Excessive air infiltration can intensify problems
associated with undersizing or oversizing a PTAC
unit. This can be the cause of insufficient cooling,
dehumidification, or heating. Sources of air
infiltration include vents, gaps around windows and
doors, and improperly sealed floors, ceilings or wall
joints.
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