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Table 1
Unit Filter Size
Unit Model Filter Size Filter Quantity
−24, −30, −36 20 in. X 25 in. 1
−42, −48, −60 16 in. X 25 in. 2
The Healthy Climate
®
PureAir
®
air purification system
(PCO20−28) may be used with 15GCSX units installed in
horizontal air discharge applications only. Installation
hardware kit (Y0629) is required to install the PCO20−28
(X8787) in the packaged unit. The PCO20−28 is designed
for universal voltage, and is ready to operate at 208/230V.
When used, the PCO should be installed before the unit is
set in place and before the duct connections are made.
Supply & Return Duct Connections
The duct system should be designed and sized according
to the methods in Manual Q of the Air Conditioning
Contractors of America (ACCA).
A closed return duct system shall be used. This shall not
preclude use of economizers or outdoor fresh air intake. It
is recommended that supply and return duct connections
at the unit be made with flexible joints.
The supply and return air duct systems should be
designed for the CFM and static requirements of the job.
They should NOT be sized by simply matching the
dimensions of the duct connections on the unit.
CAUTION
When fastening duct system to side duct flanges on
unit, insert screws through duct flanges only. Do not
insert screws through casing. Outdoor duct must be
insulated and waterproofed.
The 15GCSX unit is shipped ready for horizontal air
discharge (side duct connections). If bottom air discharge
is desired, the covers must be removed from the supply
and return air openings on the bottom of the unit and
re−installed to cover the side openings.
The upper return air opening cover must be removed when
the PureAir
®
air purification system (PCO20−28) is being
used. In PCO applications, both upper and lower return air
openings must be covered by the return air plenum to
ensure proper PCO operation. The upper return air
opening is not required in horizontal applications when
the PCO is not used.
Figure 6
Removing Supply and Return
Air Opening Covers
Base
1.Remove screw and lift.
2.Slide cover to free back pin.
1
2