Manual 2100-597
Page
16 of 52
DUCT WORK
All duct work must be properly sized for the design
airflow requirement of the equipment. Air Conditioning
Contractors of America (ACCA) is an excellent guide to
proper sizing. All duct work or portions thereof not in
the conditioned space should be properly insulated in
order to both conserve energy and prevent condensation
or moisture damage. When duct runs through unheated
spaces, it should be insulated with a minimum of one
inch of insulation. Use insulation with a vapor barrier
on the outside of the insulation. Flexible joints should
be used to connect the duct work to the equipment in
order to keep the noise transmission to a minimum.
The I-TEC Series models have provision to attach a
supply air duct to the top of the unit. Duct connection
size is 20 inches x 24 inches. The flanges are shipped
flat and must be bent upward using sheet metal flanging
pliers. The duct work is field supplied. See Figure 6 for
suggested attachment method.
Make sure to seal the slots in the bend-up flange at the
time of securing your ductwork to the flange. This can
be accomplished with either foil tape or caulk. Failing
to do so may cause air leakage/whistling of air.
NOTE: Unit cabinet, supply air duct and duct free
plenum are approved for “0” clearance to
combustible material.
The I-TEC Series models are designed for use with free
return (non-ducted) and either duct free with the use of
IPBDF Series Plenum Box (8" or 12") or a duct supply
air system.
The IPBDF Plenum Box mounts on top of the unit and
has both vertically and horizontally adjustable louvers on
the front discharge grille.
When used with a ducted supply, an ICX28 Cabinet
Extension may be used to conceal the ductwork above
the unit to the ceiling. The ICX28 extends 28" above
the unit for a total height of 10'-2" for a floor mounted
install (10'-5" with IRP3 riser & 10'-8" with IRP6 riser).
It can be trimmed in the field for installations that
require less than 10'-2".
The unit is equipped with a variable speed indoor
blower motor which increases in speed with an increase
in duct static pressure. The unit will therefore deliver
proper rated airflow up to the maximum ESP shown in
Table 1A. However, for quiet operation of the air
system, the duct static should be kept as low as
practical, within the guidelines of good duct design.
FILTERS
Two 2-inch throw away filters (24 x 30) and two 1-
inch throw away filters (12 x 20) are supplied with
each unit. The 2-inch filters slide into brackets on
both sides for the return air openings. The 1-inch
filters are in the cabinet doors for the vent (room air)
exhaust. If a CRV or ERV vent option is used, there
are two (2) additional ½" (8 x 17) washable filters
included with that option. See Figure 7 for specific
locations. The filters are serviced from the inside of
the building by opening the cabinet doors, and do not
require any tools to access.
MIS-2959
SUPPLY DUCT AND
FASTENERS TO BE
FIELD SUPPLIED
24"
20"
BEND THE PROVIDED
SUPPLY FRAME FLANGES
UP FOR DUCT INSTALLATION
FIGURE 6
SUPPLY DUCT CONNECTIONS
FIGURE 7
FILTER LOCATION
É
É
É
É
É
É
12" X 20" X 1"
FILTERS
24" X 30" X 2"
FILTERS
ACCESS TO
WASHABLE
FILTERS
COMPRESSOR
ACCESS
INDOOR
BLOWER
ACCESS
VENT
OPTION
ACCESS
