electrical installation Posts

Circuitry & Wiring Specifications for Installing Ductless Mini-Splits & HVAC Units

LG Ductless Mini-Split

LG LS120HEV1 12000 BTU Mega Series Single Zone System with Heat Pump

Ductless mini splits are one of the most popular AC choices for homeowners and businesses alike. We sell tons of mini split air conditioners each day on our website, and, on our blog, have previously written about all the benefits of and features to consider when purchasing a mini-split AC of your own.

Installing ductless mini splits requires a high level of electrical knowledge in order for the job to be done safely and without harm to yourself or the unit. For that reason, we do not recommend homeowners try to install the unit themselves. Unless you are an advanced DIYer with extensive experience in electrical work, we strongly advise you hire a professional to get the job done.

But even professionals have to learn the ropes, and so if you are an electrician who simply has not undertaken a mini split installation project before, this post is for you. Here, we offer a step-by-step guide to everything you need to know about the electrical specifications for installing ductless mini splits.

NOTE: These instructions are in regards to electrical specifications only, and do not include line set installation or refrigerant set-up.

 

Step 1 – Mini-Split Shut-off box:

Run a 230/208 volt or 115 volt* dedicated line from the main break box to the area where the shut-off box will be installed next to the unit.

* Voltage depends on the system. The vast majority of mini-split units are 230/208V, but there are some that are 115V.

Step 2 – Mini-Split Wiring:

Mount the shut off box on the outside wall and connect the wires from the break box.

Electrical Shut off box

electrical shutoff box detail
208/230 Volt Shut Off Box

In order to meet code, you must have a shutoff box at the location of the unit. This makes system repairs safer and easier. Wire the two hot leads to the fused connections in the box and the ground to the provided connection. Then, reattach the faceplate and insert the on/off switch. It should be kept in the off position while you continue to work on the unit.