Owners Manual

Page 15
mrcool.com
Unit Installation
IMPORTANT
You must use a compatible heat kit listed in the above chart. Using an incorrectly sized heat kit could
cause the unit to overheat and/or equipment damage.
This air handler is designed for a complete supply and return ductwork system.
Return ductwork:
The return ductwork is to be introduced into the air handler bottom (upflow configuration).
DO NOT dispose of the return ductwork in an area that can introduce toxic or objectionable
fumes and odors into the ductwork.
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 failure of the
compressor or heater.
• 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.
The air handlers listed in this manual do not have a factory installed electric heater. An electric heat kit is
available as an optional accessory. The only heat kits that can be used are the
MHK**U series listed in the
table below. Please refer to installation instructions provided with the heat kit, and in this manual, for the
correct installation procedure.
WARNING
• The electrical characteristics of the air handler, electric heat kit, and the power supply should be
identical. This air handler does not have a factory installed electric heat kit, however, they are
available as an optional accessory. If you plan to install a heat kit, only those in series indicated below
can be used.
DO NOT use an electric heat kit other than those recommended below.
NOTE: When the electric heat kit is turned on, the fan of the air handler must also be on.
MHK05U
MHK08U
5kW heat strip
8kW heat strip
MHK10U 10kW heat strip
Kit # Description
Compatible Heat Kits
2-Ton or 3-Ton
2-Ton or 3-Ton
Tonnage
MHK15U
15kW heat strip
MHK20U 20kW heat strip
4-Ton or 5-Ton
4-Ton or 5-Ton
2-Ton or 3-Ton
Ductwork
Electric Heat Kit Installation (Optional)