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Applications (cont), Application considerations, Undersizing – Carrier Packaged Terminal s & Heat Pumps 52P User Manual

Page 4: Oversizing, Air infiltration

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4

APPLICATION

CONSIDERATIONS

Installation instructions are shipped with all PTAC

units. It is important that air conditioning systems be

properly sized and installed for each application in

order to achieve the desired temperature 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 is 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 tem-

perature during very hot days. The result could be

warm and humid or warm and dry conditioned space.

Oversizing

If a PTAC unit is oversized (cooling capacity is greater

than required capacity for the specific application), the

unit will cool the space down to the desired tempera-

ture too quickly.
The unit will cycle on and off, however, dehumidifica-

tion 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 excessively humid, space.

Air Infiltration

Excessive air infiltration can intensify problems asso-

ciated with undersizing or oversizing a PTAC unit.

This can be the cause of insufficient cooling, dehumid-

ification, or heating. Sources of air infiltration include

vents, gaps around windows and doors, and improp-

erly sealed floors, ceilings or wall joints.

APPLICATIONS (cont)