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12
INSTALLATION
DUCTED AND NON-DUCTED INDOOR
APPLICATIONS
Air distribution within a conditioned building plays a vital role in
maintaining a constant temperature in the area. Improper air
distribution can cause areas to become cold or warm, electrical
equipment may not receive enough airflow, and the area may
feel uncomfortable. Placing a thermostat or room temperature
sensor within the conditioned area also plays a vital role in indoor
temperature control.
Indoor Supply Air Flow
Indoor Return Air Flow
There must be an unobstructed path through the room to return
room air to the central part of the device. Do not place furniture,
electronics, equipment racks, cabinets, etc., in front of appliance
return grills or registers. At least 2 feet of distance between solid
objects and return grilles or registers is recommended.
Ducts can be used to ensure proper air circulation. All specified
piping guidelines and distances must be adhered to. Return air
louvers installed in the indoor return air openings should be used
for non-ducted applications.
Ducted Applications
Field-fabricated supply and return ducts can be installed within
the conditioned structure. Before installing the unit, supply and/
or return branch ducts can be connected to the supply and return
flanges of the unit to facilitate duct connections within the structure.
Supply and return ducts must be appropriately sized to match the
unit’s airflow design requirements. Air Conditioning Contractors of
America (ACCA) is an excellent guide for proper sizing.
Piping or portions not within the conditioned space must be
adequately insulated to save energy, reduce thermal conductivity,
and prevent damage from condensation and moisture. Pipping
should be designed according to the American Air Conditioning
Contractors (ACCA) method. If the piping is installed in an unheated
space, it must be insulated with at least 1 inch of insulation. Use
insulation with a vapor barrier on the outside of the insulation.
Free Blow Applications
Some installations may not require extensive supply ductwork
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. This field-fabricated duct
must be adequately insulated to conserve energy, reduce heat
conductivity, and prevent condensation or moisture damage. All
joints must be taped or sealed to avoid air or moisture entering
the wall cavity. Follow all clearances, including distances to
combustible materials and instructions in this manual.
A metallic return air grille is required for non-ducted applications.
The spacing between louvers on the grille shall not exceed 5/8”. It
is recommended that a Clima Flex Return Air Grille Kit explicitly
designed for the wall mount product be installed. Contact your local
product distributor 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 (0.4 inWC).
Filter return air grilles do not filter air brought into the structure
through ventilation options, including fresh air dampers, ventilators,
and economizers. 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 are essential for 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.
Indoor installation areas must provide an unobstructed path for the
conditioned supply air to exit the supply air grilles and registers.
Check the area to ensure that air can be supplied to all room areas.
Ducts may be used to ensure proper air circulation. All specified
piping guidelines and distances must be adhered to.
An air supply louver grill installed over the interior air supply
opening should be used for non-ducted applications. Ensure the
supply air deflector is adjusted to distribute the conditioned supply
of air so that the conditioned supply air is properly distributed to all
parts of the room. Avoid closing sections of the supply grille, as this
may unnecessarily pressurize the supply channels.
Flexible joints should be used to connect the ductwork to the
equipment to keep the noise transmission to a minimum. Ducts
through the walls must be insulated, and all joints must 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. See instructions
on page 19, Figure 13.