Page 14mrcool.com
Unit Installation
Ductwork
This air handler is designed for a complete supply and return ductwork system.
Return ductwork:
Do not dispose of the return 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 installation must include a return air filter for the air handler or externally using a return 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 HNRd series. 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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