Home Improvement Stack Exchange
Home Improvement Stack Exchange

Questions tagged [mini-split]

A mini-split is a smaller HVAC unit with the blower and control unit inside a room, while the condenser unit sits outside. Use with any relevant tags (i.e. [electrical]). Use for questions about DIY installation of these unit.

113 questions
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What type of cable should I run to future-proof an outlet for an air conditioner?

Our new house is still under construction by a standard builder. After the home is finished, I will be installing a small mini split ductless AC system for a home office that will get much warmer than the rest of the house. I received permission…
ehftwelve
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Can I use different wire gauges in quick disconnect and from panel?

Quick disconnect kit came pre installed with 10 gauge wire. The split AC unit calls for a 20 amp double pole (2 hots). So that sounds like 12 gauge. I realize it’s probably okay to do 10 gauge for the whole run, but it’ll be more expensive and…
MZawg
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What should I consider when deciding between a PTAC and a mini-split?

I have built a workshop addition to my garage and both will be insulated. I'm located in Central Indiana, so we get chilly winters (often down to 0°F) and hot, muggy summers (90°F and 80+% humidity). My goal is to keep them heated to at least…
FreeMan
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120v vs 240v Mini Split Efficiency

I am under the impression that, as a general rule, 110v heating and cooling options are inherently not very efficient. So I was surprised to find a 120v mini split shopping around with a fairly decent SEER rating (22). I'm fine hiring an electrician…
grovberg
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How to I eliminate the smell coming from my Mitsubishi mini split units?

I have 2 Mitsubishi mini split units on the 2 additions on my house. One is a Mr. Slim Inverter and the other is an Inverter. During the warmer months when I am running them in A/C mode, they frequently give off a pungent sour milk smell. It seems…
Andrew
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Do I need a disconnect switch for my mini-split air conditioner?

As the title suggests, is a disconnect switch located near the outdoor unit of a mini-split legally mandated or a convenience item? In my case, the breaker panel is about 20' from the outdoor unit, and the mini split is on a dedicated (and labeled)…
Hari
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How do I wire a mini split that requires 208-230V with a 15A breaker, but came only with single pole wiring?

I am installing a Rovsun 12,000 BTU mini-split with heat pump. The voltage range is 208V-230V. The wiring for the unit consists of L1 Black hot wire, L2 White neutral wire, and the green ground wire. How do I wire this system to supply the voltage…
Chris
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Mini split beeping every 34 seconds

My Mitsubishi MSZ-FH09NA mini split head just started beeping. It beeps every 34 seconds whether on, off, or disconnected. This beep sounds slightly different than the on/off/function beep (quieter, a bit higher pitch, and possibly coming from a…
Evan
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Mini split for 14x15 room addition

We have a 14x15.5 family room addition on a slab. For summers we've used a window a/c. The room connects to the kitchen via a small 4.5 x 4.5 foyer. It has a doorway with the door removed. The rest of the house is central air. We're thinking about…
mike_s
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Sizing circuit for mini split heat pump

I'm getting ready to install the Mr Cool DIY 24K Mini Split Heat Pump in my garage. https://www.homedepot.com/p/MRCOOL-DIY-24-000-BTU-2-Ton-Ductless-Mini-Split-Air-Conditioner-and-Heat-Pump-230-Volt-60-Hz-DIY-24-HP-230A/207085061 I'm having trouble…
ubiquibacon
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Mini-split vs gas boiler for heating

I recently had three mini-split heads installed, two downstairs and one upstairs, primarily for A/C. These are Mitsubishi units, rated down to -15C (or perhaps F, but it doesn't really matter for my purposes). I've been considering using them for…
rogerl
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Installing a series of FS140 surge protectors to prevent mini split board burnups

I'm having some issues with my current electrical setup. I had an electrician install a 36k Eaton whole house surge protector about a year ago, and the hvac company installed a gree mini split. Since then, I've had 2 gree minisplit main boards burn…
Anthony Ac
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Couple of questions on the outside unit of a split heat and A/C installation

I have a Viessmann heat and A/C installation where a single large common outside unit located on the roof connects to split units on three separate floors. First question: There is a pair of copper tubing leading to each floor (three floors, six…
Sabuncu
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Wiring for mini split sysytem

My mini split system call for a 12/3 wire on a 30amp circuit. I thought i had to use 10/3 wire on a 30amp circuit. Is it safe to use the 12/3 wire?
Steve Maningas
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Ductless mini-split AC with multiple indoor units for a home with small bedrooms?

Location: US, NYC. I want to improve the air conditioning setup for an apartment in a 2-family house. Current situation: 200 sq ft master bedroom, horrible old through-the-wall AC on a dedicated 20A 120V circuit two 80 sq ft bedrooms, currently…
nyc_relative_newbie
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