036-33072-001 Rev. A (0601)
Unitary Products Group
11
DUCTWORK
When installing ductwork, adhere to local Codes and sensible
practice. Minimize duct runs and avoid abrupt changes in
direction where possible. Allow ample access space for ser-
vicing of the coils and changing of filters. Perform regular
maintenance on ducts to increase unit life, maintain efficient
operation, and reduce accumulation of explosive dust. Refer
to blower performance charts, and engineer duct runs and
accessory pressure drop so as not to exceed maximum
external static values.
Canvas or other types of flexible collars are recommended for
connecting the air ducts to the unit. The supply air duct collar
can be connected directly to the blower outlet flanges. Return
air may be ducted to the unit, or drawn directly from the con-
ditioned space (5-15 ton models with optional return air grille)
or mechanical room (20 and 25 ton models). If a ducted
return is desired, duct connection flanges may be secured
directly to the air intake opening of the 5 through 15 ton units
-filters are accessible from the right hand side. The filter
frame on 20 and 25 ton models has duct attachment flanges
incorporated into the filter rack.
SUPPLY AIR/RETURN AIR CONFIGURATION
All models are field convertible for multiple supply/return con-
figurations. The 5 through 15 ton models feature a removable
upper fan module that can be rotated 180° for top rear dis-
charge applications. In addition, the blower outlet panel may
be interchanged with the front panel of the fan module. Inter-
changing these two panels allows horizontal fan discharge to
either front or rear of the unit.
The blower outlet panel may also be interchanged on the 20
and 25 ton units to provide horizontal discharge.
FIGURE 6 : SUPPLY AIR/RETURN AIR CONFIGURATION
