Questions tagged [mini-split]

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29 views

AC minisplit (two condenser ((2x 24k) vs one condenser_48K with two branch boxes)

I am trying to install A/C minisplit system with 6 zones. However there is no space for the indoor branch boxes unless huge home improvements is done. I was wondering if to install two condensers in ...
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1answer
42 views

Can't find SEER rating for Bryant Split AC system

I own an older house with a hot water heat system and I am want to get a Split AC system installed. The setup involves 2 9,000 BTU units, one in each 2nd floor bedroom and a 12,000 BTU unit on the ...
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0answers
41 views

Brand new Fujitsu Halcyon split system unable to keep temperature

We had a Fujitsu split system installed, with 4 indoor units. The issue I'm seeing is that the system is behaving in a way that I can only describe as "erratic". We're observing a couple of ...
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0answers
18 views

Diagnosing CH 05 (communications failure) in LG mini-split system?

I installed a mini-split system in my shop (it's the second mini-split I've put in; the first went great). Everything appears fine, except that after a few minutes, the system shuts down and the ...
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0answers
32 views

Mini split whirring sound

I recently had a new cooling only 12K inverter mini split installed in my bedroom which I run 24/7 on low fan speed. The unit is very quiet and I am generally pleased with it. However I have noticed ...
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2answers
79 views

How bad is it to have low spots in a mini-split line set?

I'm about to install a mini-split system in my shop, and several online sources have recommended strongly against coiling extra line set length, because it creates a low spot that traps condensed ...
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1answer
55 views

Mini-spit AC unit consuming electric power when off

I have discovered that my recently installed mini-split is still consuming electric power when it is turned off. This is a 12k btu cooling only TGM mini-split inverter. I noticed that it seemed to ...
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3answers
97 views

Can I use exposed UF instead of THHN in conduit to outdoor AC disconnect?

I'm installing a mini-split and need to run power outside to the disconnect box, then an additional line from the disconnect to the compressor unit. In most installs I've seen, power to the the ...
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0answers
17 views

Extra valves on AC lineset?

I'm installing a mini-split system in my shop, but realize I’ll probably need to move the outdoor unit in 6-12 months. Does it make sense to try to add a pair of valves to each line to allow them to ...
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1answer
37 views

Run mini-split heat pump heads at different temperatures

I vaguely remember the contractor who did maintenance on our ductless heat pumps two summers ago telling us not to set the thermostats of the two small heads that share an outdoor unit to different ...
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1answer
81 views

Reusing old service wires from electric furnace to mini-split

EDIT to answer replies: @3phaseeel 30-amp wires are 6 AWG aluminum, 50-amp wires are 4 AWG aluminum. The sheathed wires run along the garage roof truss overhead (see picture), exposed for about 28 ...
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1answer
77 views

Installing ductless units in my apartment. What am I supposed to do with all these coolant and drain lines?

I'm installing 3 ductless AC units in my apartment. I know the lines are supposed to go outside and connect to the condenser but there are three coolant lines wrapped in insulation and three drain ...
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1answer
36 views

Are the indoor unit's fan suppose to stop when set temperature is reach for Dakin mini splits?

I have a Daikin ductless heat pump with 3 heads. When the set temperature is reached, no heat comes out and the fan stops? Is the indoor fan supposed to stop after reaching the set temperature? I don'...
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1answer
108 views

12/3 to disconnect box for mini split install?

I have an issue with installing a disconnect box for my 24k LG mini split condenser unit. 12/3 is coming from 20 amp double pole breaker to disconnect box with surge protection box(ICM517). I ...
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1answer
86 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
70 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
71 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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34 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
133 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
39 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
699 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
17 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
339 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
2k 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
915 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
247 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
1k 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
746 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
50 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
61 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
93 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
516 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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2answers
1k 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
127 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
384 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
3k 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
222 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
57 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
7k 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
35k 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
55 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
3k 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
621 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
5k 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
920 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
196 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
112 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
8k 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, ...