Gree GA Series Product Data page 19

FIELD- -INSTALLED ACCESSORIES (CONT.)
APPLICATION CONSIDERATIONS
Installation instructions are shipped with all PTAC
OUTDOOR GRILLE SELECTION
units. It is important that air conditioning systems be
properly sized and installed for each application in
IMPORTANT: If you wish to use a grille not made
order to achieve the desired temperature and humidity
for the Gree GA series contact Gree Application
levels within the space to be conditioned. It is
Engineering.
strongly recommended that a professional engineer
The following guidelines must be followed in the
match the PTAC units with the building structure and
initial selection of any alternate exterior grille or
climate.
louver:
The following application considerations are all
1. The louver must have a minimum of 65% free
important in choosing the proper PTAC system for
area. Free area is the minimum area of the
the building structure.
opening in an air inlet or outlet in which air can
Undersizing
pass. Free Area (%) = X/Y.
2. The louver should be attached to the wall sleeve
If a PTAC unit is undersized (cooling capacity is less
in a manner that will prevent recirculation of
than required load for an application), the unit
condenser discharge air into the inlet. In most
will not be able to cool the space down to the desired
applications, baffles, splitters, and/or gasket
temperature during very hot days. The result could be
will be required between the chassis tube end
warm and humid or warm and dry conditioned space.
sheets and the
Oversizing
recirculation.
The above criteria must be followed, since a louver
If a PTAC unit is oversized (cooling capacity is
that is restrictive or allows re- -circulation will result
greater than required load for the specific application),
in a reduction of the unit's capacity and efficiency
the unit will cool the space down to the desired
and will ultimately shorten the compressor life.
desired temperature too quickly.
The unit will cycle on and off, however,
dehumidification only takes place when the unit is
Hardwire Kit
operating. The result of this type of application in a
hot and/or humid climate would be a cool, yet
Part No.: HARDWIRE-KIT-15A
excessively humid, space.
HARDWIRE-KIT-20A
Air Infiltration
HARDWIRE-KIT-30A
This accessory hardwire kit provides a permanent
Excessive air infiltration can intensify problems
connection to the unit. Electrical hard wiring is
associated with undersizing or oversizing a PTAC
required when NEC (National Electrical Code) or
unit. This can be the cause of insufficient cooling,
local codes restrict the use of power cord and plug
dehumidification, or heating. Sources of air
connections. The hardwire kit easily mounts on the
infiltration include vents, gaps around windows and
front right side of the unit and comes with 36 inches
doors, and improperly sealed floors, ceilings or wall
(914.4 mm) of flexible steel conduit.
joints.
Conduit Interface Kit
Part No.: CONDUIT-KIT-15A
CONDUIT-KIT-20A
CONDUIT-KIT-30A
The conduit interface accessory kit provides an easy
wire connection to the unit to interface to existing
field- -supplied conduit.
louver to prevent air
Condensate Removal
Gree's GA series has a new condensate (water)
disposal system. The outdoor fan prop has a built in
slinger ring which draws condensate water through a
suction port built into the outdoor coil shroud. The
water passes though the suction port and is sprayed
on the warm outdoor coil for evaporation. Thus
providing better disposal of excess condensate and
Y
X
X
improving unit operating efficiency.
Y
It is normal and desirable to have some condensate
water in the ebase pan to boost operating efficiency.
NOTE: This unit will not always evaporate 100%
of the unit generated condensate and blown in
rain water. If it is necessary to control 100% of
Louver Dimensional Reference
the condensate, the Drain Kit (Part No.: DRAIN-
KIT-4PK) and a building condensate drain
Sample Calculations
system is recommended.
Free Area (%) =
x = 1
y = 1.5
1
F.A. (%) =
1.5
Hardwire Kit
Conduit Interface Kit
19
5
X
Y
X
Y
x
x 100
y
x 100 = 66.7%
A07381
A07810