Manual 2100-711F
Page
9 of 45
supply and/or return stub duct may be connected to the
unit supply and return flanges before unit installation to
help with duct connections inside the structure. Supply
and return ducts 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 conserve energy, reduce heat conductivity,
and prevent condensation or moisture damage. Refer to
Maximum External Static Pressure (ESP) of Operation
table on page 41. Design the duct work according to
methods given by the Air Conditioning Contractors
of America (ACCA). When duct work is installed
in unheated spaces, it should be insulated with a
minimum of 1" 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. Ducts through the walls must be insulated
and all joints taped or sealed to prevent air or moisture
from entering the wall cavity.
All model series require a 1/4" clearance to
combustible material for the first 3' of duct attached
to the outlet air frame is required. See instructions
on page 10 and Figures 14 − 18 (pages 13 – 16) for
further details.
A metallic return air grille is required for non-ducted
applications. The spacing between louvers on the grille
shall not be larger than 5/8". It is recommended that a
Bard Return Air Grille Kit is installed that is designed
specifically for the wall mount product. Contact the
local Bard distributor or visit www.bardhvac.com for
ordering information. A field-supplied return grille
that meets the 5/8" louver criteria and does not cause
the unit to exceed the maximum specified external
static pressure (ESP) may be used. If using a return
air filter grille, filters must be of sufficient size to
allow a maximum velocity of 400 fpm. Filter return
air grilles do not filter air being brought into the
structure through ventilation options including fresh air
dampers, ventilators, economizers and energy recovery
ventilators. Be sure to install the return grille with the
louvers pointed downward towards the floor. This will
help ensure return air is drawn upward from the floor
and improve air circulation in the room.
NOTE:
If no return air duct is used, applicable
installation codes may limit this cabinet to
installation only in a single story structure.
Thermostat or Indoor Temperature Sensor Placement
The location and installation of the thermostat or
temperature sensor that monitors indoor temperature is
very important regarding unit operation. Avoid placing
the thermostat in an area exposed to direct sunlight
or air from doorways leading outdoors. Use a piece
of insulating material to close off conduit openings
or holes in the wall surface for wire entry into the
thermostat or temperature sensor. This will help avoid
non-conditioned air from entering the thermostat
and effecting temperature and/or humidity readings.
As common practice, the thermostat or temperature
sensor should measure the temperature of the air
being returned to the unit, and not the conditioned
air being supplied by the unit. Placing the thermostat
or temperature sensor near a return air opening will
normally result in optimal unit performance.
Unit Installation
Make sure to have the proper tools at the work site that
are needed for unit installation. The following steps
are provided to ensure the unit is installed properly to
the wall surface, and that the unit will provide years of
service with minimal service requirements.
Materials/Tools List
Additional hardware and miscellaneous supplies are
needed for installation. These items are field supplied
and must be sourced before installation. This list also
includes tools needed for installation.
• Appropriate safety gear including gloves and safety
glasses
• 5/16" hex bit with drill driver
• Phillips head screwdriver
Fire hazard.
Maintain minimum 1/4" clearance between the
supply air duct and combustible materials in
the first 3' of ducting.
Failure to do so could result in fire causing
damage, injury or death.
!
WARNING
Free Blow Applications
Some installations may not require extensive supply
duct work throughout the structure and are referred
to as free blow applications. A short field-fabricated
supply duct must be used in the wall cavity to
transition between the supply collar on the unit and
the supply louver grille in the room. The duct must
be properly insulated in order to conserve energy,
reduce heat conductivity and prevent condensation or
moisture damage. All joints must be taped or sealed to
prevent air or moisture entering the wall cavity. Follow
all clearances including distances to combustible
materials and all instructions provided in this manual.
A non-restrictive metallic supply air grille with
deflectors is required for free blow applications. Contact
the local Bard distributor or visit www.bardhvac.com for
ordering information.
