Mini Split -- Hole Diameter for Line Set

[bimmer1980]

For the guys that have installed their mini splits.

What is the minimum hole size for the line size?

I have some areas of the attic trusses that I want to run some conduit for the line set and want to use an appropriate size. I also have some plate steel brackets that I might run the line set thru, which would require drilling large holes....

I know 3" would be ideal.... but would smaller work? i.e. 2"

 

[SALIV8]

My mini splits have different line set sizing per system. So double check the specs but I used a 2.5" core drill and plastic sleeve per unit. On the bigger linesets 2" would be tight imo.

 

[Jackfre]

To get power, insulated drain and line set in 2” without ripping the insulation, which came lead to condensation inside the wall and without kinking the line-set? Impossible for me at least. Also, in a really tight turn you may create a trap in the drain. It is also fun after you try to bend and form the damned soft copper that it work hardens in the first 1/8 of whatever turn you need. Be happy. Go bigger.

 

[jjrbus]

Take a couple of pieces of lineset foam and drain line put them together and see what you think. Personally I would not want to try much smaller, this is assuming you have 1/4 and 3/8 line.

Another personal opinion for the horizontal drain lines use 3/4 inch PVC with a good slope to it or you will end up with a mess. I did use the thinner wall schedule 40 pipe for my horizontal drain line.

 

[bimmer1980]

I have not ordered a unit yet, so it is hard to just take components and check......

Thanks for the feedback... That confirmed what I was thinking.....