Mini split systems and central HVAC systems often get mixed up, but there are a few big differences between the two. Understanding these differences will give you a better idea of which type of system to add to your home. And should you choose to go with a mini split system, you’ll want to study up on our free Multi Zone Mini Splits Buying Guide to find the perfect system for your needs.
If you skim through any AC listing, you’ll notice something called a SEER rating or EER rating. Sometimes, you’ll notice both. These numbers can play a big role in the AC shopping process.
But what are SEER ratings, exactly? What do they mean? What is an EER rating and how is it different? Both of these ratings are crucial to choosing an AC, but there are some key differences between them that are important to know before you purchase a new unit. We’ll talk about what these ratings mean and how to determine which air conditioning efficiency rating is right for your home.
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.
How to Wire a Mini Split System
Follow these steps to wire up your ductless mini split system
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.
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.