Can I Buy Different Pre-Charged Line Set Lengths for the MRCOOL DIY? - Ask the Expert Episode 149

Hi, this question is asked many ways but each are unique as is the response to each. Can I hire a pro HVAC tech to cut the excess lineset length off? It came with 25ft, we are using about 5ft including what is coming out of the air handler. The manuals do not list any required minimum length for linesets and I've done that with great success with another brand of pre-charged linesets. So, if a pro cuts it and properly solders it at the unions and does not lose the coolant, can this be done without voiding a warranty? Thank you!

This web site rally has all of the informatrion I wanted concerning this subjkect and didn't know who to ask.

I recently installed a MRCool DIY Minisplit. After installation I noticed the precharged line that I bought it too long (I got the 25feet) and there are some shorter lines in the market. The unit is working fine but I was wondering if I can replace the longer lineset with a shorter one to increase its efficiency? I.e, do I lose the refrigerant stored in the compressor and indoor unit if I replace the lineset?

i only need about 5 feet of line set it is said to coil the rest im cool with all that but some say the coiled line set prevents the oil from going back to unit how could this be good

On 2 zones the heat function works fine but the cooling does not. When in cooling mode the lines get white with frost on the 2 zones that do not cool. Is it possible to recharge the lines? I'm running a 36k 4 zone compressor.

Can I install a few mini split DIY models and in 2 years when I get my house vinyl sided, can I then disconnect and reconnect the line sets or will they lose the pre charge. If so what should I consider doing?

When I unscrew the caps on the copper lines coming from the conditioning unit it releases quite a bit of air. Is this a refrigerant or just air released from the factory? Isn't the refrigerant in the base unit that is released into the pipes after you have connected the conditioner pipes to the base unit and turn the screws to release it?

I can add additional linesets but how do I add communication wire as well to get to the condenser?

What is the length of the lines directly connected to the back of the DIY air handler? Do the directly connected lines add to the length of the pre-charged 25' DIY line? Can the directly connected lines coming from the back of the DIY air handler unit be run a few feet horizontally after coming from the back of the unit before being turned down toward the air handler?

What are the different length precharged line sets available at this time? Considering a five zone cpt kit. I would need 50,35,35,35 and 25’ line sets the way i have it planned at this time.

Can I use coupling kit with 2nd generation 18k DIY mini split to lengthen the precharged lineset?

It's cold here in New England. Is there anything I can do to limit the times the df code comes on. Is it possible to mount a mirror above the back that would shine on the back coils? Sounds silly, I know

Can you connect a non pre-charged line set (i found this line set by pioneer which is 10ft). 1) Can it be connected, if so do we evacuate and then charge it and connect? 2) When you say a professional can modify Mr Cool line set, would like to know what are steps involved. Will they have to evacuate/re-charge the line after modifying the length and hook it up to the condenser. SInce the ends are sealed how will the modification be? Cut in the middle and solder it?

Dan, one more for you. Are these line sets normal copper? Or, well, how are they different?

Is it possible to disconnect the Mr. Cool DIY line set and then reconnect it, or will that add air into the system or leak refrigerant?

Can you trim the line set? Would you have to recharge it? Is the charge in the line set or the outdoor unit?

I have a 25' line set on one or out Mr Cool DIY units now and have a coil beside the unit running vertically. Can I buy a pre-charged 16' line set and just swap it out to reduce the coil length? Is there any advantage in doing that? I have read that sags or coil in the line is "bad"

My 2k DIY unit is mounted above a service door with the outside unit on the outside at the same height. I've got 25' lines and only need about 4'. Where should I place the 20' +/- of excess refrigerant lines? A) On top of the outside unit (Horizonally laying) B) Between the wall and outside unit (Vertical hang) C) Along the side of the outside unit (Vertical hang) D) Other ---> please explain your answer.

with the Mr Cool 5 ton unit i believe you can get it in both standard compressor or slim like the ones that come with mini splits. It says its field convertible from 5 ton to 4 ton by changing the dip set switch setting. My question is i believe all mr cool systems are now inverter systems if you go mini or standard handler. But do all handlers do low ambient temp cooling or is that needed to be added ? I am asking this because its for a horticultural room. Where i need a minimum of 3 tons but if i go standard single stage and say only have 2 drop downs in the room it would be blowing like a hurricane. Will an inverter system make up for this high cfm rate of a single stage or no. I would like the 5 ton mr cool but for future expansion. Or if i hire a HVAC pro are their other perhaps cheaper routes , still good manufacturers that offer low ambient temp cooling?? Hopefully i made sense , and not biased to just mr cool. Just to my knowledge, only company that you can do completely diy as long as you know how to do electrical and only one to put the same technology they use in their mini splits into their standard handler cabinet as well. room is 2,240 cubic feet needs to be able to cool to 60 degrees, even on the hottest summer days. i know not efficient but currently having to use 14k dual hose portable unit, even with ambient temps around 40-60 currently and has already spiked to low 70s and once a few weeks back to low 80s. Temperatures in room reaching 85+

Hi I believe my lines leaked, is it possible to buy another recharged line set and hook it back up and it will work fine?

this summer I bought a 24k BTU 2 zone air and heat condenser, In hooking the first zone it worked fine because I need most of the 25', but in trying to hook up the second zone which also came with a 25' line it was way more line than I need. In trying to get the extra coiled up I broke the one line. My question is can I purchase a 16' pre-charged line for this second zone?

Hello, does it matter if my excess line is coiled and placed vertically? Or does it have to be horizontally stored?

If you use the coupler with the diy kit do I also need to buy more pre charged line or do I get an uncharged line to extend the pre charged line it came with?

Thanks, but I think I answered my own question. I took the front cover off and found that these are hard lines with no disconnection point. So, there are no lines to replace. Looks like I'm calling a contractor to braze and recharge. Thanks for your time.

While installing my DIY Mr Cool unit, my lines twisted and broke a couple inches outside the air handler. Should I buy a replacement line set and re-install or repair these lines(solder) and call an HVAC contractor to recharge?

I'm in Arizona usually in summer temperature stay around 110 up to 120 deg f.what is the max operating temperature of your compressor and circuit board for 18000 btu advantage and DIY series. Indoor coil and outdoor coil are copper . Is the compressor DC inverter system. Thanks

Is this not a longer pre charged line you can buy? https://www.totalhomesupply.com/p/mrcool-nv50-3834-50-foot-insulated-line-set-for-universal-series-2-3-ton-system-3-8-x-3-4

I am trying to hide the extra unsightly lines and was wondering can I bury them directly behind the compressor. The units is interior unit is mounted in a basement just above dirt level and the compressor is just behind it. Thank you

Can you connect 2 16 ft sets of line?

I only need 10 feet of line. Since I can not order shorter than 25 feet what is the best way to handle the excess. And 2nd does having more than is needed effect the efficiency? Thank you for your help, Pat