Ductless Mini Split Electrical Requirements

January 8, 2009 by Shawn Mack  
Filed under Installation Guide, Technical Guide

“Before purchase of a mini split air conditioner make sure you have an available circuit breaker in your electrical box.”

Installation of mini split air conditioners requires the ability to work with both refrigerants and electricity.  When purchasing any ductless air conditioner be aware of the voltage requirements in the manufacturer specifications.  The most common electrical specifications will require either 110 volt or 220 volt wiring. 

When searching for mini split air conditioners remember that 110 volt systems are generally only used on units 12,000 btu. or less.  Anything above 12,000 btu. will be manufactured 220 volt.

Unlike window air conditioners that plug into electrical receptacles, most mini split air conditioners are hard wired from the electrical fuse box.

Generally, mini split outdoor condensers receive power from the electrical fuse box through an outdoor disconnect box for safety.  Always use a disconnect box when wiring mini split air conditioners. 

Check with the local electrical safety code for the proper distance between the disconnect box and the mini split condenser.  In most cases the disconnect box should be located close enough to pull the power while standing at the outdoor condenser.

The indoor evaporators receive power directly from the outdoor condenser.  Electrical wiring is run alongside the refrigerant line set.

Make sure to check the requirements for proper electrical wiring gauge.  The systems I have worked with used 14 gauge high voltage wiring for the entire system.

Proper breaker size is also very important.  Before purchase of a mini split air conditioner make sure you have an available circuit breaker in your electrical box.  Ductless air conditions require the use of its own circuit breaker. 

A dual pole 20 Amp circuit breaker handles most manufactured mini split systems up to 24,000 btu.  Make sure to check with the manufacture specifications for proper circuit breaker sizing.

Make sure to contact your city hall to obtain the proper permit for the electrical work being performed.

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9 Responses to “Ductless Mini Split Electrical Requirements”
  1. raymond Says:

    Could explain to me how a 24000btu equivalent to 7000 watt/hr requiring
    31.8 amps at 220 volts with a wire no 10 can be fuse with a 20 amp breaker ? Is there something that I missed here ?

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  6. jon Says:

    Are there split units that are powered by the inside air handler therefore
    eliminating the need to hard wire the condensor?

  7. greg Says:

    Dude is out of breakers in panel. Can I run a 1 ton mini off a lighting breaker? 20 amp.

  8. Shawn Says:

    Yes, there are many mini split air conditioners that can be run on a 20 amp dedicated circuit breaker. Make sure to read the ductless air conditioners specification manual to verify its power consumption.

  9. Wayne Says:

    I have little experience with the Mistubishi Mr slim mini split. I came across a unit that was blowing 67 degrees at the indoor evaporator and it was calling for 59 degrees. the condensing unit was getting 180 volts from the disconnect.

    Any suggestions?

    Thanks


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