Questions tagged [mini-split]

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22 views

Leak check mini split AC

I am finishing up a 6 zone mini split DIY installation and before closing up some of the walls I would like to do some leak checks. My set up is that from the condenser it splits into 2 branch boxes ...
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1answer
31 views

Mini split minimal pipe length

Quick question - my LG mini split manual says that I need a minimal of 10’ from the indoor unit to the branch box. My question is do I include the 1-1.5’ piping that comes with the indoor evaporator? ...
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1answer
43 views

Piping gravity fed condensate line down interior wall into crawlspace then through rim joist to outside

Mini split piping and control lines will run up the outside of the house into attic, then to interior Wall units. I can’t run the condensate drain lines on this path without pumps. The idea is to run ...
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28 views

Replacing Central air with a Split system

I'm trying to replace two central Air conditioners (one per each floor. 2-3 ton each) in my home and I'm not sure if I should go with Ductless (because of a much lower cost) or pay higher and replace ...
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1answer
90 views

ON Electrical Code: 240V line from panel to exterior (fused / nonfused subpanel) for AC

I'm a complete newbie to this so I have a few questions... 1) Gauge of wire from panel to exterior subpanel? I know it's two live from a 220V breaker and neutral, also do I need GFCI, or a standard ...
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1answer
37 views

Best tool for cutting a 2" horizonal sloped canal cut through a 11' plaster/lath internal wall

In one room I need to cut groove into a wall to accommodate a condensate drain from a minisplit air handler/evaporator in an adjacent room. I know I could use a pump but I rather rely on old fashion ...
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2answers
102 views

Minisplit ductless communication wire question

Simple question and I am obviously missing something, but the manual calls for 14/4 to be used as the communication/power cable. That is 1 wire for communication, 2 hot wires and lastly one for ...
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0answers
16 views

ductless air handler install

So I am about to embark on an install of a 6 zone ductless system and I have 2 questions around installing the air handlers in each bedroom. I am using a branch distribution box which needs to be ...
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2answers
113 views

110v outlet convert to disconnect?

I have a 110v outlet with a dedicated 20 amp breaker. My question is can I remove outlet and run the same 12/2 wire to the outside wall about 4 feet away from outlet and turn it into a disconnect box ...
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3answers
398 views

My Acacia dining table starting to show some huge splits or cracks

We got this Acacia dining table from costco and noticed after a year or so it started to crack on one end. Initially the crack was pretty tiny and now it's very noticable.I was wondering what are the ...
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2answers
419 views

Mini Split Condenser wall mount on wood exterior wall

We have a wood-frame house with 2x4 studs and half-inch plywood exterior walls. What is the generally accepted best practices for mounting a 80lb mini split condenser on a wall bracket to this type of ...
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1answer
148 views

Mini Split liquid line shaking

I just installed a new Mr. Cool system a few weeks ago. Works great, its quiet and works as expected. I haven't finished the lineset covers since the routing is a bit wonky so I was able to see the ...
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2answers
706 views

New mini split ac on existing Spa disconnect

I'm installing the mini split and wiring it to the disconnect they had for a spa which is now long gone. They wired a 110 gfci off the disconnect which I'm not touching. Coming in from the main ...
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0answers
428 views

Does cabling between a mini-split indoor and outdoor unit need conduit?

I am installing a mini-split AC system where there are multiple indoor units connected to a single outdoor unit. For each indoor unit, there is a separate 4-conductor cable that connects to the ...
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1answer
44 views

AC Condensate Line Location - Outside vs Inside

I'm installing a few mini-split AC units in my house, and I'm trying to determine the best place to run the condensate line. Right now it's either between running it outside with the line set and tray ...
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0answers
45 views

split system air conditioner condensate hose

I need to buy and install a split AC and I have a small issue. The AC has two copper pipes for refrigerant gas to flow through and one hose to eliminate condensation water, and normally, the hose ...
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1answer
74 views

Ductless AC Initial Charge

I just purchased an LG mini-split set: 18,000 BTU indoor unit https://www.supplyhouse.com/LG-LSN180HSV5-18000-BTU-Ductless-Standard-Multi-F-Air-Conditioner-Inverter-Heat-Pump-w-Built-In-WiFi-Indoor-...
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0answers
2k views

Daikin Mini Split Runs Constantly

We had a Daikin ductless system installed as a replacment for our old system that finally died. We have 4 total units inside the house, with 1 in each of the 3 upstairs bedrooms and a larger 18K BTU ...
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2answers
263 views

Is there harm in using my mini-splits in conjunction with my hot-water baseboard heat?

My new house has a natural gas boiler with three zones of radiant baseboard heat (one per floor). It also has a mini-split system (again one head per floor). The mini-split was advertised as air ...
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1answer
1k views

Condensate pumps for mini-split system within attic; is this the best location?

We had a Gree mini-split system installed in our condo located in the SF Bay Area in 2016. Since the location of the 3 units (both bedrooms and living room) are not mounted on external walls, ...
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2answers
988 views

Possible to drain mini split into clean out opening?

I have a mini split in a bedroom that was set up so the condensed water drains via a plastic hose into 5 gallon bucket in the cellar. There is no proper drainage in the cellar so periodically I have ...
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1answer
105 views

Mini-split HVAC in new build?

Next few weeks I will be in the process of getting quotes for mini-split HVAC system. Curious, if anyone has gone ductless and if so, how is that working out? The house will be a a two story build(...
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1answer
288 views

Fusible plug blew on mini-split A/C, how to fix?

I have a 2005 Mitsubishi mini-split that has been working OK but blew the fusible plug (on the low side just before compressor) this winter while it was in heating mode. Now I'm wondering what to do. ...
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4answers
2k views

Mini Split Condenser in Garage? With ventilation?

I live in a fairly warm and dry environment and due to HOA restrictions am unable to place a window A/C unit, outdoor unit, or a system on the roof. I understand that A/C shouldn't go in attics due to ...
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2answers
99 views

Can ductless air conditioning+heat pumps work well on floors that have doors closed?

Our home is a split level, with 5 floors - basement, den, kitchen, bedroom, master. Each of those floors is mostly open EXCEPT the bedroom floor, which is 4 separate rooms. A HVAC contractor we got a ...
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1answer
54 views

Ductless MiniSplit Install Resources

I'm installing a multizone ductless minisplit in my house. Many of the items I need have already been purchased, I have not purchased: Line Sets Nitrogen Testing Tank 410a Refrigerant I'm ...
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1answer
6k views

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 ...
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5answers
28k views

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-...
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1answer
47 views

Forced hot air and mini heat pump

I recently bought a house and I have forced hot air currently. It works fine, the only issue I have with it is that it constant turns on and off. I've been looking into mini heat pumps and they seem ...
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2answers
2k views

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 ...
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1answer
537 views

Replacing thermostat on Sanyo mini split

I have an old Sanyo KMH 0922 mini split. The air conditioning seems to work OK. Last winter on heat it was either on or off the thermostat wouldn't control the temperature correctly. This ...
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5answers
4k views

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 ...
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1answer
775 views

Best foam for copper wiring insulation in split-unit A/C?

I went to home depot to buy foam insulation for my A/C split unit inverter. It's to cover the copper wire (and other wires) that go from the inside unit (in the room) to the outside unit (in a roof ...
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0answers
170 views

What is causing that buzz when running my mini-split air conditioner?

There is a short buzz noise that emanates randomly while running my GREE mini-split air conditioner. At first I thought it occurs only while running one of the 3 units, but it seems to occur when ...
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1answer
111 views

Ductless Mini Split System for Cooling, Heating, and Dehumidification [closed]

I have a 22x24 foot building that I'd like to heat, cool, and dehumidify in East Texas. I'm specifically interested in purchasing a ductless mini split system to achieve this, but I have the ...
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1answer
7k views

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, ...