Manual 2100-578L
Page
16 of 42
DUCT WORK
Any heat pump is more critical of proper operating
charge and an adequate duct system than a straight air
conditioning unit. 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 heat pump has provision to attach a
supply air duct to the top of the unit. Duct connection
size is 20" x 24". 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 heat pumps are designed for use with
free return (non-ducted) and either duct free with the
use of IPBDFZ Series Plenum Box (18" or 12") or a
duct supply air system.
The IPBDZ 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, a 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" or can be trimmed to any
height.
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" throw away filters (24 x 30) and two 1" throw
away filters (16 x 25) are supplied with each unit. The
2" filters slide into brackets on both sides for the return
air openings. If a CRV vent option is used, there are
two additional 1" throw away 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-3202
COMPRESSOR
ACCESS
ACCESS TO
WASHABLE
FILTERS
INDOOR
BLOWER
ACCESS
24" X 30" 2"
FILTERS
MIS-3681
SUPPLY DUCT AND
FASTENERS TO BE
FIELD SUPPLIED
BEND THE PROVIDED
SUPPLY FRAME FLANGES
UP FOR DUCT INSTALLATION
24"
19 1/4"
FIGURE 6
Supply Duct Connections
FIGURE 7
Filter Location
VENT & FLOOR MOUNTING
HOLE ACCESS DOOR
