i
nstallation
C
onsiderations
IM 1049-9
10 www.DaikinApplied.com
Return air ductwork can be connected to the standard
filter rack. See
Figure 9
(side filter removal shown). The
filter rack can be installed for bottom filter removal or
side filter removal by locating the brackets. For side filter
removal the brackets should be located on the bottom,
left side, and top. For bottom filter removal the brackets
should be mounted on the left side top and right side
with the spring clips supporting the filter.
Do not use sheet metal screws directly into the unit
cabinet for connection of supply or return air ductwork,
especially return air ductwork which can hit the drain pan
or the air coil.
Figure 9: Standard 1"(25mm) Filter rack/return air duct collar
Standard 2" (51mm)
Figure 10: Optional 2"(51mm) Filter rack/return air duct collar
Tool-less Filter Removal
Ventilation Air
Ventilation may require outside air. The temperature of
the ventilation air must be controlled so that mixture of
outside air and return air entering the conditioner does
not exceed conditioner application limits. It is also typical
to close off the ventilation air system during unoccupied
periods (night setback).
The ventilation air system is generally a separate
building subsystem with distribution ductwork. Simple
introduction of the outside air into each return air plenum
chamber reasonably close to the conditioner air inlet is
recommended. Do not duct outside air directly to the
conditioner inlet. Provide sufficient distance for thorough
mixing of outside and return air. See
"Operating Limits"
on page 15
.
