Gree GA Series Product Data page 41

APPLICATION CONSIDERATIONS PACKAGED TERMINAL COOLING UNIT
WITH HEAT PUMP OR ELECTRIC HEATING
Installation instructions are shipped with all PTAC
units. It is important that air conditioning systems be HVAC Guide Specifications
properly sized and installed for each application in
Size Range:
order to achieve the desired temperature and humidity
Cooling: 7,600 to 15,000 Btuh (2051 to 4396 WH)
levels within the space to be conditioned. It is
Electrical Heating:5,600 to 17,100 Btuh (1641 to
strongly recommended that a professional engineer
5015 WH)
match the PTAC units with the building structure and
climate.
Heat Pump: 6,100 to 13,800 Btuh (1876 to 3956
WH)
The following application considerations are all
Model Numbers:
important in choosing the proper PTAC system for
the building structure.
GAE Series, Cooling with Electric Heat
GAA Series, Heat Pump with Electric Heat
Undersizing
If a PTAC unit is undersized (cooling capacity is less
Part 1 — System Description
than required load for an application), the unit
Packaged Terminal Air Conditioners shall be of the
will not be able to cool the space down to the desired
sizes and capacities as shown on the contract drawing
temperature during very hot days. The result could be
schedule and in the specifications.
warm and humid or warm and dry conditioned space.
System shall be tested to insure no water infiltration
Oversizing
into the room, when tested at eight inches of rain per
hour with 40 mph (64.4 KPh) wind.
If a PTAC unit is oversized (cooling capacity is
The complete system shall consist of the following:
greater than required load for the specific application),
A. Packaged Terminal Heat Pump or Heat/Cool
the unit will cool the space down to the desired
Chassis : See section 2 - - Chassis Description
desired temperature too quickly.
B. Power Cord or Hardwire Kit shall provide the
The unit will cycle on and off, however,
dehumidification only takes place when the unit is power connection to the unit.
C. Insulated Polymer Wall Sleeve shall provide
operating. The result of this type of application in a
hot and/or humid climate would be a cool, yet
excellent thermal insulation, be textured to hide
excessively humid, space.
scratches and prevent shine, will have superior
outdoor noise absorption and shall be corrosion
Air Infiltration
free for the life of the product. The Wall Sleeve
must have dimensions of 42" (1067 mm) width x
Excessive air infiltration can intensify problems
associated with undersizing or oversizing a PTAC 16" (406 mm) height x 14- -7/8" (377.8 mm) depth
unit. This can be the cause of insufficient cooling, and be shipped with a rear weather barrier
dehumidification, or heating. Sources of air
installed.
D. Wall Sleeve Molding shall trim the wall sleeve to
infiltration include vents, gaps around windows and
doors, and improperly sealed floors, ceilings or wall
the existing wall, to hide wall imperfections and
joints.
irregularities due to the sleeve opening.
E. Outdoor Polymer Louvered Grille shall resist
corrosion, breakage and match the color specified
on drawing schedule and specifications.
F. Subbase will support the wall sleeve when it
extends into the room more than 4" (101.6 mm).
Subbase must come
pre- -assembled, with a built in receptacle (size as
specified on drawing
specifications).
from the factory
schedule and
Condensate Removal
Gree's GA series has a new condensate (water)
disposal system. The outdoor fan prop has a built in Part 2 — Chassis Description
slinger ring which draws condensate water through a
2.1 General:
suction port built into the outdoor coil shroud. The
water passes though the suction port and is sprayed The chassis shall be
on the warm outdoor coil for evaporation. Thus single- -piece heating and/or cooling unit, that is
simple to install and operate. Just slide the chassis
providing better disposal of excess condensate and
into a wall sleeve, plug it into an outlet, and operate
improving unit operating efficiency.
after installation. The chassis dimensions shall not
It is normal and desirable to have some condensate
exceed 42" (1067 mm) wide and 16" (406 mm) high
water in the ebase pan to boost operating efficiency.
with room cabinet in place. The chassis shall consist
NOTE: This unit will not always evaporate 100%
of the following functional sections and components:
of the unit generated condensate and blown in
A. Certifications:
rain water. If it is necessary to control 100% of
System shall be approved and certified by UL &
the condensate, the Drain Kit (Part No.: DRAIN-
UL, Canada. Chassis shall meet ASHRAE Standard
KIT-4PK) and a building condensate drain
90.1 for minimum energy efficiency.
system is recommended.
B. Operating Characteristics:
Chassis shall be capable of starting and running at
115˚ F (46.1˚ C) ambient outdoor temperature per
maximum load criteria of ARI Standard 310/380.
C. Electrical:
The accessory power cord or hardwire kit for the
unit will be ordered separately. The power cord
accessory will be 58" (1473 mm) for 208/230v
models or 15" (381 mm) for 265v models. The
Hardwire kit accessory will provide 36" (914 mm)
of flexible conduit. The chassis current draw shall
be specified on the chassis nameplate and match
electrical requirements specified on the Contract
drawing schedule and specifications.
The power cord plug configuration shall conform
to NEMA standards and the rating shall support
the current draw of the electric resistance heater.
For 265v installations, UL codes require the use of
an electrical equipped subbase for power cord
usage or hardwire conduit for non- -corded
installations.
D. Safeties:
Compressor shall have automatic reset, over
temperature and over current protection. The fan
motors shall have an inherent, automatic reset
over temperature protection. The electric heater
shall have two over temperature protectors.
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a factory- -assembled,