MrCool MHK U Series Quick start guide

Please read this manual carefully before installation and keep it for future reference.
Owner & Installation
Manual
Electric Heat Kit
Model: MHK**U
Due to updates and constantly improving performance, the information and instructions within this
manual are subject to change without notice. Please visit www.mrcool.com/documentation to
ensure you have the latest version of this manual.
Copyright © 2022 MRCOOL, LLC
Thank you for choosing MRCOOL. Please read this manual carefully before installation and keep it for future reference.
Version Date: 01-19-22

MRCOOL®Electric Heat Kit
Page 1 mrcool.com
1. Remove the front panel and upper access panel from the air handler by removing the screws
with a screwdriver.
.
2. Remove the screws holding the electrical box in place.

3. Remove the electrical box and move it to the side.
.
MRCOOL®Electric Heat Kit
Page 2mrcool.com
4. Remove the screws holding the access panel in place.

MRCOOL®Electric Heat Kit
Page 3 mrcool.com
5. Slide the electric heat kit into the opening behind the access panel removed in the previous
step. (NOTE: The end of the heat kit has prongs which align with holes on the back wall of the
air handler. Please refer to the images below as a guide.)
.
6. Secure the heat kit to the air handler by installing the mounting screws.

MRCOOL®Electric Heat Kit
Page 4mrcool.com
7. Next, install the breaker. (NOTE: During the installation, you will need to lift up the buckle first.
Then, hold the breaker bracket and put down the buckle to properly secure the breaker).
8. Connect the electric heat kit connector to the air handler wiring harness.

MRCOOL® Electric Heat Kit
Page 1 mrcool.com
MRCOOL® Electric Heat Kit
Page 5 mrcool.com
8. Once the heat kit is securely mounted, refer to the wiring diagram on the electrical box and
the electrical information contained within the air handler installation manual for the proper
wiring instructions and procedures.
9. Once the heat kit has been properly wired, reinstall the electrical box back to its original
position with the screws that were previously removed.
10. Reinstall the front and upper panel to the air handler to complete the installation process.
.
WARNING
All wiring of the installation should ONLY be performed by a qualified electrician.

Electric Heat Kits
MRCOOL®Electric Heat Kit
Page 6mrcool.com
esureldnaHriA.feRnoitpircseD#tiK
1 MHK05U Circuit Breaker,5kW Heat Strip MDUI18024,36
2 MHK08U Circuit Breaker,8kW Heat Strip MDUI18024,36
3 MHK10U Circuit Breaker,10kW Heat Strip MDUI18036
4 MHK15U Circuit Breaker,15kW Heat Strip MDUI18048,60
5 MHK20U Circuit Breaker,20kW Heat Strip MDUI18048,60

Electric Heat Kit
Due to updates and constantly improving performance, the information and instructions within this
manual are subject to change without notice. Please visit www.mrcool.com/documentation to
ensure you have the latest version of this manual.