Carrier PREMIER 52P SERIES Architects And Engineers' Manual

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Carrier PREMIER 52P SERIES Architects And Engineers' Manual Manual pdf 4 page image

4APPLICATIONCONSIDERATIONSInstallation instructions are shipped with all PTACunits. It is important that air conditioning systems beproperly sized and installed for each application inorder to achieve the desired temperature and humiditylevels within the space to be conditioned. It is stronglyrecommended that a professional engineer match thePTAC units with the building structure and climate.The following application considerations are allimportant in choosing the proper PTAC system for thebuilding structure.UndersizingIf a PTAC unit is undersized (cooling capacity is lessthan required capacity for an application), the unit willnot be able to cool the space down to the desired tem-perature during very hot days. The result could bewarm and humid or warm and dry conditioned space.OversizingIf a PTAC unit is oversized (cooling capacity is greaterthan required capacity for the specific application), theunit 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. Theresult of this type of application in a hot and/or humidclimate would be a cool, yet excessively humid, space.Air InfiltrationExcessive 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 includevents, gaps around windows and doors, and improp-erly sealed floors, ceilings or wall joints.APPLICATIONS (cont)