Page 14mrcool.com
Unit Installation
Ductwork
This air handler is designed for a complete supply and return ductwork system.
Return ductwork:
Do not install and/or position ductwork in an area that can introduce toxic, or objectionable
fumes/odors into the ductwork. The return ductwork is to be introduced into the air handler
bottom (upflow configuration).
Return Air Filters:
Each air handler installation must include a return air filter or external air filter grille.
WARNING
DO NOT operate the unit without all ductwork completed and attached.
• Inadequate ductwork that restricts airflow can result in improper performance and compressor
or heater failure.
• Ductwork is to be constructed in a manner that limits restrictions and maintains suitable air
velocity.
• Ductwork is to be sealed to the unit in a manner that will prevent leakage.
Electric Heater
The air handlers listed in this manual do not have a factory installed electric heater. An electric heat kit is
available as an accessory. The only heater kits that can be used are
MHK**U series listed on the following
page. Please refer to installation instructions provided with heater kit for the correct installation procedure.
WARNING
• The electrical characteristics of the air handler, the electric heater kit, and the supply power
should be identical.
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