A Guide on How to Install Your New Ductless Mini Split Heat Pump

A Guide on How to Install Your New Hybrid Heat Pump Water Heater

The MRCOOL® DIY® Multi-Zone Series ductless mini-split is the only whole-home mini-split solution that you can install yourself. Maintaining your MRCOOL heat pump is made easy with this 3rd generation model. This system provides simple, easy air comfort in up to four zones. The heat pump features:

  • Easy DIY® Installation
  • Pre-charged DIY®
  • Quick Connect Line Set*
  • Simple to Use
  • Multi-room Comfort
  • Energy Efficient DC Inverter
  • 100% Sealed System
  • Gold Fin® Condenser
  • Eco Safe R-410A Refrigerant
  • Smartphone App Controls
  • Lifetime Technical Support
  • Follow Me® Feature
  • Low Ambient Cooling

Maintaining Your MRCOOL Heat Pump


Power supply must be disconnected before attempting any kind of cleaning or service. Before performing maintenance, turn the power off to the unit and then disconnect the power to the circuit at the breaker. Failure to do this could cause electrical shock. 

  • DO NOT use benzene, thinner, polishing powder, or similar solvents for cleaning. These may cause the plastic to crack and/or deform. 
  • DO NOT clean the unit with excessive amounts of water. 
  • DO NOT touch the metal parts of the unit when removing the filter. Injuries can occur when handling the sharp metal edges. 
  • DO NOT use water to clean inside the air conditioner. Exposure to water can destroy the insulation, leading to possible electric shock. 
  • DO NOT use a chemically treated cloth or duster to clean the unit. 
  • DO NOT touch the air freshening (Plasma) filter for at least 10 minutes after turning off the unit. 
  • DO NOT wash the air filter with water hotter than 104°F (40°C).
  • DO NOT clean the unit with combustible cleaning agents. These could cause fire or deformation. 
  • DO NOT expose the filter to direct sunlight, it may cause it to shrink. Allow it to dry in the shade. 
  • DO NOT apply heat to the filter as it can deform or melt the filter. 

Cleaning the Unit

  • Wipe the unit with a soft dry cloth. If the unit is very dirty, wipe it with a cloth damp with warm water. DO NOT use bleach or abrasives. 

Cleaning the Air Filter and Air Freshener

NOTE: A clogged air filter can greatly reduce heating and cooling efficiency of this unit. It is recommended to clean the unit every 2 weeks. It is recommended to clean the filter every 30 days, or bi-weekly if you have indoor pets.

  1. Open the front by carefully lifting both ends at the same time. As you continue lifting, at a certain angle there will be an audible click and the lid will become self-supporting. Some models are equipped with suspension bars that are required to prop the lid open.
  2. Use the filter tabs to lift the filter slightly upward and then pull it towards you.
  3. Then, extract the filter by gently drawing it downward. Replace as necessary.
  4. Unclip the small air freshening filter from the larger air filter. Replace as necessary. Otherwise, clean it with a vacuum and clip it back into place after cleaning the larger air filter as outlined in step 5.
  5. Clean the large air filter with warm, soapy water. Be sure to use a mild detergent. Rinse with fresh water. Shake off excess water and dry in a cool area. DO NOT use heat as it could melt the filter.
  6. Re-clip air freshening filter into large air filter.
  7. Re-fit air filter back into the unit by reversing steps 2 and 3 – gently pushing top up into the unit and then lowering the bottom into place.
  8. Close the front panel. Make sure that buckles fully fit and the panel is completely closed.

Preparation for Extended non-Operation

If you plan to not run the unit for a long period of time (e.g. from the end of summer to the beginning of the following summer), perform the following:

  1. Clean the indoor unit and filters as previously outlined.
  2. Operate the unit in FAN only mode for at least 8 hours to dry the inside to dry the inside of the unit.
  3. Turn off the unit. Then, turn off the power to the circuit at the breaker. The unit should be the only appliance on the circuit.
  4. Remove the batteries from the remote control.
  5. The outdoor unit also requires periodic maintenance. However, it is highly recommended you contact a qualified service professional to perform this. Please do not attempt to do this on your own.

Pre-Season Inspection

After prolonged non-operation perform the following:

  1. Check for Damaged or Disconnected Wires.
  2. Clean the Indoor Unit and Filters.
  3. Check for Water and Oil Leaks.
  4. Check for Blockages in Airflow Inlet and Outlet.
  5. Replace Batteries in Remote Control.

We hope you found our maintenance guide for the MRCOOL Ductless Mini-Split Heat Pump helpful. Please refer to the MRCOOL Installation & Owner’s Manual for a more detailed guide on maintaining your MRCOOL heat pump.

How to Get Your Home to Net Zero

We’re Here to Help!