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Location
Whether designing a new structure or replacing packaged
terminal air conditioning units in an existing building,
Carrier units can meet your needs in the following
locations:
• Hotels and motels
• Nursing homes and assisted living care centers
• Offices
• Apartments
• Single-family dwellings
• Home conversions and residential add-ons
New construction
The Carrier 52V vertical packaged terminal air condition-
ing (PTAC) unit is designed to meet the needs of the archi-
tect, engineer, and contractor. For unit installation,
Carrier’s expert support network will assist in all applicable
aspects of the construction project, from preparing a bud-
get to start-up.
Advantages for new construction
Design flexibility for the architect/engineer:
• Whisper-quiet performance, indoors and out
• No bulky duct system
• No separate equipment room
• No water towers or additional cooling equipment
• No complex match-up of different HVAC components
• Less sensitivity to building orientation (sun, wind, shade)
• Optional architectural grille to permit custom exterior
appearance
Initial cost savings for the building owner:
• No expensive component HVAC system to purchase
• No equipment room or maintenance engineering staff
• Weather-protected wall sleeve that goes in place during
building construction (unit slides in place after construc-
tion is complete)
• No seasonal changeover required for cooling or heating
Lower operating costs and reliable comfort for
the occupant
• Heat pump models offer substantial savings over mod-
els with conventional electric resistance heaters
• Individual units allow tenants to choose the degree of
comfort and operating economy
• Rapid servicing reduces downtime — complete chassis
can be replaced in minutes without disrupting other
occupants.
• Each unit operates independently of other units in the
building. No dependency by building on central HVAC
system.
Sizing
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 cli-
mate. 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 ca-
pacity 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 humid or warm and dry conditioned space.
Oversizing —
If a PTAC unit is oversized (cooling capaci-
ty is greater than required capacity for the specific applica-
tion), the unit will cool the space down to the desired tem-
perature too quickly. The unit will cycle on and off, howev-
er, 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 excessively hu-
mid, space.
Air infiltration —
Excessive air infiltration can intensify
problems associated with undersizing or oversizing a PTAC
unit. This can be the cause of insufficient cooling, dehu-
midification, or heating. Sources of air infiltration include
vents, gaps around windows and doors, and improperly
sealed floors, ceilings or wall joints.
Ventilation
A 4-in. aluminum vent pipe is connected to the condenser
fan venturi and the side of the unit cabinet. A mesh screen
is installed inside the vent pipe. A metal plate on the side of
the cabinet covers the opening of the vent pipe.
Up to 50 cfm of fresh air can be introduced into the
equipment closet by removing the metal cover plate. The
fresh air then mixes with the return air and is pulled
through the evaporator coil and into the supply duct.
The cover plate can be re-installed to partially close the
fresh air opening if less than 50 cfm is desired. An external
source of negative pressure (i.e., bathroom fan) could be
used to introduce more than 50 cfm of fresh air if desired.
VENTILATION
Application data
