- Wiring Mini Split Inside Control Wires
- Wiring a Mini Split Electric AC
- Items Needed Disconnect Box
- Types of Wire Gauge for Mini Split
- Wiring a Disconnect Box To Mini Split
- Wiring from Breaker Panel to the Disconnect Box
Wiring up a mini split HVAC unit is not difficult but does require some basic electrical knowledge.
This post gives a basic overview of wiring up a mini split.
The instructions that come with any unit should always be followed.
- Electrical AC Power (Usually labeled L1, L2, and Ground)
- Inside Unit Control Wires (Usually labeled 1, 2, 3)
The breaker will need the correct amps the mini split is rated for and will be displayed on the breaker.
For example, a breaker labeled 15 will be a 15 amp breaker, or 20 will be a 20 amp breaker.
Electrical AC wiring will need to be bought separately from DIY mini split kits and is not included.
The control wires go between the inside and outside units.
Wiring Mini Split Inside Control Wires
- Run the Control Wires
- Match the color of the wires to the labeled numbers
Most Mini Split units will have the inside and outside units marked with numbers 1, 2, 3, and ground which the wires color code will match.
For example, if a red wire is connected to the inside number 1, it will be connected outside to the number labeled 1.
Wiring a Mini Split Electric AC
- Know the Correct Voltage (110-115/220-230)
- Know the Amps
- Use the Right Breaker Size
- Use the Right Wire Gauge
Wiring the AC electrical needs to be thought out with each situation different.
The voltage can be standard 110-115 volts or 220-230 volts.
The amps it draws to run will also be rated.
The unit will need the rated breaker size to run the unit and trip off if there is a problem.
As most know, this is what a breaker does it shuts off, stopping the flow of power if there is a problem.
Items Needed Disconnect Box
Most all mini spits units will need a disconnect box placed close to the unit to turn on and off the power.
A disconnect box is simply a junction that, like a switch, turns on and off the power when needed.
The disconnect is not a breaker but an emergency shut-off and is used by technicians to shut power off when working on the unit.
Example Disconnect Box on Amazon
SIEMENS WN2060U Non-Fused AC Disconnect
Types of Wire Gauge for Mini Split
Wire gauge is how thick the wire is with different sizes for different voltages and amps.
|Lamps / Lights / Some Mini Splits
|Outlets / Some Mini Splits
|Clothes Dryers / Some Mini Splits
|Electric Stoves Furnaces
The wire gauge needed will be in the instructions, with common sizes for mini split units being 10-12 gauge.
While most units will be 10-12 gauge, be sure to read the specifications to get the correct size wire.
For example, what wire gauge does a 12,000 BTU mini split use?
A 12,000 BTU mini split will most often use 12 gauge wire.
Wiring a Disconnect Box To Mini Split
Disconnect Boxes are simple to wire up with power coming in and going out.
Electrical wires will need to be run from the breaker to the disconnect box with an electrical whip making it quick and easy to run to the mini split unit.
Example Electrical Whip on Amazon
Sealproof Power Whip Assembly, 1/2-Inch x 6 Ft
Wiring from Breaker Panel to the Disconnect Box
The location of the panel and the outside mini split location is always different.
The first step is to know the location the Mini Split will sit at.
The next step is to find the electrical panel which holds the breakers.
For example, a 20-foot run will need enough wire to go the entire distance.
Each type works well and is often a personal preference on which to use.
When I install a unit, I almost always use liquid-tight and PVC, with both very flexible and easy to use.
The main goal of the conduit is to protect the wire from the elements.
Most of the time, the conduit is run along a wall but can be buried or run through the walls of some homes.
Whichever conduit is used, for a mini split most all are sized 1/2-Inch.
Liquid Tight Conduit on Amazon
Sealproof 1/2-Inch Flexible Nonmetallic Liquid-Tight Electrical Conduit Type B, UL Listed, 1/2″ Dia, 25 Feet
Wiring the breaker is like any other appliance and will depend on whether the unit is 115 or 220 volts.
Below is a full video for wiring a mini split electrical to a panel along with connecting to a disconnect and breaker.
Wiring up a mini split unit is not difficult if you have some wiring experience, such as hooking up a ceiling fan or electric water heater.
If in doubt, be sure to call a professional.
Each wiring scenario from the breaker to the disconnect will be different.
Sometimes a home’s existing wiring can be tapped into and used depending on the scenario.
The wiring from the disconnect to the outside condensing unit is almost always the same.
This post is meant to give the basics of wiring up a mini split.
With the many mini split air conditioner heat pump available, there is likely to be variations.
Be sure to always follow the instructions that come with your unit.