How Long of a Line Set Can I Get For A Mini Split? - Ask the Expert Episode 118

I am trying to design a 6+6+9 3 zone system, and I notice that the 3 heads are in basically a straight line: 6000 BTU C HHHHHH C ---------------------+-------------------------------+ C HHHHHH HHHHHH 9000 BTU 6000 BTU Is it possible to run *one* line pair of coolant lines to all three heads, and Tee off of that one line, (but not the control) and/or Condensate?

Replacing my air handler but new one sets lower for Lin connect ! Can I braze 2 feet to lines.

I bought a multi zone with 3 airflow units. The lineset lengths for each room will be roughly ~20 feet, ~26 feet, and ~36 feet. How can I tell if I need to get additional refrigerant?

The indoor (garage) lineset will be elevated about a foot relative to the head unit, then run horizontally for 30 feet before dropping to ground level. Is that OK? I'm planning on a 18k MRCool for my 600 Sq foot garage.

Hi, If I run the linesets thru the attic space to the head units in 3 bedroom, will I need a condensation pump to handle the vertical climb from the bedrooms to the attic? Are the condensation pumps located at the air handlers?

Hi Dan, my question is, when you look at the varied costs of purchasing a new mini-split, they are broken down by BTU, SEER and indoor units being 6 + 6 or 6 + 9 all the way up to 12 + 12; what do those values represent? Thanks, Jane

Hi Kyle! I am installing a Mr Cool DIY multi zone 27k BTU, with 9k + 18k air handlers. The 9k handler will go in an upstairs / attic space and will require a 40-50 foot connection to the condenser. I see that I have the option to purchase different 'line set' lengths (I'm planning on getting a 16 foot and a 50 foot) however I cannot figure out if the "line set" includes electrical wires? I see some videos online showing electrical wires connecting directly from the back of the Mr Cool DIY Hair Handler unit but cannot find reference to how long these wires are, or if you can get them longer / length to match line set length? Thank you!

We have an attic we are considering finishing into a hang out room. It's currently very old and leaky, but we'll be adding spray foam.The floor dimensions are roughly 20'x25', however the ceiling/walls are one and the same. Think triangle maxing at about 8 ft for the peak. Would the reduced cubic measurement allow me to get away with a 9000 btu?

I have an LG duel system with 2 inside inverters and one condenser outside. One inverter with a 25-ft line set hardly heats as much as the other inverter with a 10-ft. line. Is the refrigerant separate for each line set per inverter ? Wondering if refrigerant is low for one if they are separate.

When installing a mini split, should it require the normal roll of 25 ft of refrigerant line rolled up or can it be cut shorter?

I have a soleus air mini split single zone. This is a heat/ac unit. I have 2 questions. 1 is the indoor fan on these supposed to run all the time. 2. When in cool mode are both copper lines supposed to be cold to the touch, and if not what could be the problem? Keep in mind this is a used unit that was just recently installed by homeowner.

if I have to use a 50ft line, should I get adapters to increase the diameter of the line so that flow resistance is less? thank you

Hey Kyle I love your interesting remarks on this subject. I’m adding a unit in my garage and can’t add the air handler right outside because it’s right by my neighbors door entrance. Just about ten feet to his front door. Maybe twelve feet. Anyway I’d like to add it 15 paces down the house and around to poured slab with plenty of room. Add four feet from existing AC house unit. Just a little of fifty feet. Read that from previous question you had., also need to get nine btu or twelve btu. Said something about getting precharges unit on your post or someone else.,

Been reading all your comments. I want to install a mini-split in my garage. New 2" insulated garage door, R-38 blow-in insulation in the attic. Garage is one block wall and two insulated walls between interior walls. 19X19 garage. I have to put the condenser on the back end of my condo. I estimate about 55 to 60 foot run for the lines. Your thought on the size unit and can I run the lines that long? Thanks for the help. Tom

Do you recommend flaired joints or brazing?

Hey Dan, So, we had a Carrier multi-zone mini split system (5 of them) installed in October 2019. The issue is with cooling, but we had some problems with heating during the winter too. We have been running our AC for about 1 month, and one unit inside is not cooling, except when another unit in an adjacent room is on. Also, the largest unit in a large room doesn't cool as well when it's very hot outside, or other units are on. A service tech came out and identified that 6 of the lines at the valves, on the outside unit (condenser ?), indicated leakage. He believed the outside unit should be replaced, but it was up to Carrier. The office contact person says they contacted Carrier (been 5 days) to see if the entire outside unit can be replaced (it's still under warranty), or if they should just refill with refrigerant, and reseal the valves (scheduled for this Monday, 6/15/20). Also, I have heard that if the outside unit is no longer manufactured, and the outside unit needs replaced, then each unit in the house would also need to be replaced. I have also heard that this self contained systems were not meant to have to be refilled with refrigerant. So, I'm a little suspicious of what is going on. What do you think? Hope this makes sense. Thank you in advance. Gary

so i need a unit that does 2 zones, i don't have a way to make one zone work and the run will be longer than 50 feet, one area is 192 sqft, one is 96 sqft other is about 300 sq ft. the 300sqft is service by a 14x20 return and a 4 x12 output from the main air conditioner for the house, we can seem to get the 300 sqft area cool or warm enough. I am adding the first 2 spaces mentioned first that are in an unconditioned attic that just got flooring and now walls yet

My out door unit and wall unit distance is 30ft do you think This distance reduces or does not affect the cooling power

any advise on sizing a unit? I want to add one to my attic, which is very hot in the summer. Also do the Mr. Cool units come with anything longer than the 25 foot lines that are precharged? Is there any work around if I want to use a Mr. Cool unit but require more than 25 feet?

Good afternoon my question is what is the usual electrical wire gauge used to connect the Mr.Cool to my circuit breaker

Love the sense of humor in answering the question. Thanks

Hi, is there a minimum requirement length for a line set? (Only need 7feet). Wasn’t sure if you need a certain amount of coolent between fhe units.

I'm going to need a 50ft MrCool line set, will it come flared and insulated?

Can I connect two 25 ft precharged line sets to equal 50 ft.

Seriously, can I run a copper line extension to another head on a separate building? These two buildings are adjacent but my easiest and only way right now is to run the line around the entire building and it is about 70 feet total. thanks

I had to cut my line set to 9 feet. Is the unit going to be ok as it is or do I need to remove refrigerant?

Dan, I'd like to install a recessed or ceiling handler (intended use is horizontal) in the vertical position. I'm doing this because floor or wall mounted handlers in this space would be unattractive. Can that be done without damage to the handler or compromising its functionality?