Manual 2100-752B
Page
18 of 49
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.
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
Indoor Ducted and Non-Ducted
Applications
Air distribution inside the structure being conditioned
plays an important role in making sure the area is
a consistent temperature. Improper air distribution
can result in areas being cooler or warmer, electrical
equipment not receiving sufficient airflow or occupancy
discomfort felt inside an area. Thermostat or indoor
temperature sensor placement inside the area being
conditioned also plays an important role in indoor
climate control.
Indoor Supply Airflow
Indoor installation areas must provide a non-restrictive
path for the conditioned supply air to leave supply
grilles and registers. Inspect the area to ensure that all
indoor portions of the room or rooms will have access
to supply air. Ductwork may be used to ensure proper
air circulation and all provided ductwork guidelines and
clearances must be followed. Non-ducted applications
must use a supply box with supply grilles that installs
on top of the unit. Be sure to adjust supply deflectors
to properly disperse the conditioned supply air to all
parts of the room. Avoid closing sections of the supply
grilles which would cause unneeded supply duct
pressurization.
Indoor Return Airflow
A non-restrictive path for room air returning to the
center section of the unit must be provided inside
the room. Avoid placing objects including furniture,
electronics equipment, equipment racks and cabinets
directly in front of the unit return grilles and registers.
Bard recommends at least 2' between solid objects and
return grilles or registers.
Ducted Applications
Field fabricated supply duct work may be installed
inside the structure being conditioned. A short supply
duct may be connected to the unit supply flanges
before unit installation to help with duct connections
inside the structure. Supply 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 38. 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
Free Blow Applications
Some installations may not require extensive supply
duct work throughout the structure and are referred
to as free blow applications. 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.
A top supply box is required for non-ducted
applications. The spacing between louvers on the grille
shall not be larger than 5/8".
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.
