It is important to get the proper wiring for the safe, effective operation of a mini split heating and cooling system. Here are some charts that will help you choose the correct wire gauges and circuit breakers for your system. Some of the smaller mini splits operate on 110 volts, while most need 220 volts. Whichever one is used, the connecting cable extends power from the disconnect box to the condenser unit of the mini split.Īll electrical appliances and systems need wires of the correct size (gauge) to safely and efficiently handle the amount of current the system will use. This could either be wire that is approved for outdoor use, or an electrical whip, which is a waterproof tube which looks somewhat like a garden hose through which wires are run. The connecting cable provides electrical power to the entire system. The disconnect box is there so the power may be easily and safely removed from outside the building when the system needs maintenance or repair.Ĥ. It may have another fuse or circuit breaker in it. The disconnect box has either a switch or a removable “plug” that will shut off all power at that point. For example, 12-gauge wire is thicker than 14-gauge wire.ģ. Note – the lower the number of the gauge, the thicker the wire. These wires are to be run all the way from the main panel to a disconnect box on the outside of the building within just a few feet of where the outdoor unit will be located. Wires of the appropriate gauge (thickness) for the mini split to be installed. These breakers act as the surge protector for the mini split.Ģ. A dedicated circuit breaker or breakers in the main service panel of the building. The normal configuration of the electrical connection for a mini split consists of the following:ġ. The size of this wire will be determined by the type and size of the mini split system being installed.
This provides all the power needed to run both components of the system. Electrical wiring and a drain tube are often bundled with them.Īn electrical service line must be run from the main breaker panel in the building to the mini split outdoor unit. Between them is a line set, aka lineset, which includes two insulated copper tubes through which the refrigerant flows.
The evaporator or air handler is the indoor unit. They have similar electrical needs, so the information found here can apply to either type. How a Mini Split WorksĪ mini split system may either be for a/c only, or a heat pump, which will provide both cooling and heating. There are FAQs at the end of the article.
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Easy-to-read charts are included, along with examples of how to use them, which will enable you to quickly find the information you need. This article focuses on the electrical connection that will provide the proper voltage and watts needed to power mini splits of different sizes. Mini splits are powered by electricity, so there is the need to extend an electric service line to the area where the outdoor component will be located. The Mini Split AC/Heat Pump is becoming the method of choice for heating and cooling home additions, workshops, and garages, just to name a few places popular for installation.
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