Can I put more than one single-zone ductless mini split on a single branch circuit?

Question

I’m planning to replace my old central forced air HVAC with mini split systems, but for a number of reasons, it will be more than a single multi-zone compressor. In that regard, am I required to have a dedicated branch circuit to each compressor, or can I run a single (appropriately sized) branch circuit to two or more compressors (assuming each one has its own disconnect)?

The main reason for this is the lack of room left in my breaker panel, and each unit typically requires two poles (the most efficient units are 240 V). It also makes the wiring effort easier.

Even if each unit has a rated maximum service breaker, it seems a disconnect with a breaker in it would address this, right?

Answer 1

All of the mini split system I've worked on have required dedicated circuits. Think about installing a sub panel out by the compressor locations and feeding it from your main panel. From the sub panel you use individual breakers and circuits sized for each compressor.

Answer 2

I cannot say that all mini splits require a dedicated circuit but that is easy to get around.

Using the existing feed, install a small NEMA 3R panel that has 5 breaker positions. If both mini splits are within 50’ and can see the small panel, add a lockout clip for each mini split and you have the required disconnect and dedicated circuit.

I have used this method many times, including my own home. The small “spa” panel having a circuit for each mini and a circuit for the service or convenience receptacle works within code provided you have a 4 wire feeder.