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Duct System Installation
DUCT SYSTEM INSTALLATION
Proper duct sizing and design is critical to the
performance of the unit. The duct system
should be designed to allow adequate airflow
through the unit during operation. Air flow
through the unit MUST be at or above the
minimum stated airflow for the unit to avoid
equipment damage. Duct systems should
be designed for quiet operation. Refer to
Figure 2 for vertical duct system details. A
flexible connector is recommended for both
discharge and return air duct connections on
metal duct systems to eliminate the transfer
of vibration to the duct system. To maximize
sound attenuation of the unit blower, the
supply and return plenums should include
internal fiberglass duct liner or be
constructed from ductboard for the first few
feet. Application of the unit to uninsulated
ductwork in an unconditioned space is not
recommended as the unit's performance will
be adversely affected.
At least one 90° elbow should be included in
the supply duct to reduce air noise. If air
noise or excessive air flow is a problem, the
blower speed can be changed. For airflow
charts, consult Engineering Design Guide for
the specific unit.
If the unit is connected to existing ductwork, a
previous check should have been made to
insure that the ductwork has the capacity to
handle the airflow required for the unit. If
ducting is too small, as in the replacement of
a heating only system, larger ductwork
should be installed. All existing ductwork
should be checked for leaks and repaired as
necessary.
HTV/HTD/HTH SERIES
DUCT SYSTEM INSTALLATION
6
INSTALLATION
VERTICAL UNIT LOCATION
Units are not designed for outdoor
installation. Locate the unit in an
INDOOR area that allows enough space
for service personnel to perform typical
maintenance or repairs without removing
unit from the mechanical room/closet.
Vertical units are typically installed in a
mechanical room or closet. Never
install units in areas subject to freezing or
where humidity levels could cause
cabinet condensation (such as
unconditioned spaces subject to 100%
outside air). Consideration should be
given to access for easy removal of the
filter and access panels. Provide
sufficient room to make water, electrical,
and duct connection(s).
If the unit is located in a confined space,
such as a closet, provisions must be
made for return air to freely enter the
space by means of a louvered door, etc.
Any access panel screws that would be
difficult to remove after the unit is
installed should be removed prior to
setting the unit. Refer to Figures 1 and
2 for typical installation illustrations.
Refer to Engineering Design Guide for
dimensional data.
1. Install the unit on a piece of rubber,
neoprene or other mounting pad
material for sound isolation. The
pad should be at least 3/8" to 1/2" in
thickness. Extend the pad beyond
all four edges of the unit.
Heat Controller, Inc.
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