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Unit Installation
Page 12mrcool.com
3.6 Ductwork
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This coil is designed for a complete supply and return ductwork system. Inadequate ductwork, that restricts
airflow, can affect performance and can lead to compressor or heater failure. Ductwork should be constructed in
a manner that limits restrictions and has the ability to maintain suitable air velocity. The ductwork should be
sealed to the unit in order to prevent leakage. The ductwork should also follow the guidelines below in regards
to the return ductwork and return air filter arrangement.
Return Ductwork:
DO NOT terminate the return ductwork in an area that can introduce toxic or objectionable
fumes/odors into the ductwork. These will be introduced into the coil and dispersed
throughout the ductwork into the indoor areas.
Return Air Filters: Each installation must include a return air filter. This filter may
be located at the coil, or externally with a return air filter grill.
WARNING
DO NOT operate the unit without all of the ductwork completed and installed.
DO NOT operate this product without all of the ductwork attached.
3.7 Unit Installation
The furnace, air handler, and condensing unit should be installed according to the installation instructions
provided with those units before the coil can be installed. Position the cased coil on top of the furnace or air
handler cabinet and secure it using field-provided screws.
NOTE: If the coil is to be installed on an oil furnace, it may be necessary to have a field-installed
transition between the furnace and the coil to prevent an airflow restriction and possible damage to
the coil drain pan. Please refer to the oil furnace installation instructions for further details.
3.8 Sealing Ducts
Ensure that the duct is secured and all joints are properly sealed to the coil cabinet flanges. All indoor cabinets
MUST be taped after installation to seal against any air leaks. System performance and efficiency will be reduced if
any leaks are present.
WARNING
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There must be an airtight seal between the bottom of the furnace and the return air plenum. Use
fiberglass sealing strips, caulking, or an equivalent sealing method between the plenum and the air
handler cabinet to ensure a tight seal.
DO NOT allow the return air to be drawn from a room where the air handler, any gas-fueled
appliance (ex: water heater), or carbon monoxide-producing device (ex: wood fireplace) is
installed.
3.9 Leak Testing, Evacuating, and Charging
Refer to the outdoor unit installation instructions for leak testing, evacuating, and charging procedures. Always
check the entire system for leaks before charging it.
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