I have installed a mini split at my house a few years ago. At the time, most of the HVAC forums and videos had their leaks at the flare connection. Seemed like solid advice was to use the flare that comes on the unit rather than the line set and reflare the ends. I used some sort of lubricant on the outside of the flare to help the nut bind against it.
I'm not really concerned about the line set vibrating as much as the flare ends vibrating. Those no kink still look to have a copper flare needed. I would just isolate the line set well and secure it from movement.
I'm not an HVAC guy nor have I even installed mine on my bus, but that's my take..
Originally Posted by ism minerals
The items are rectorseal nokink 66733, there is also one for 1/4 lines.
yes my concern would be the fatigue of the copper lines mainly due to vibrations of the units being mounted under the bus. I will most likely put some dampeners on the bottom of the units to absorb some of the road vibration and will attach the lines as secure as possible if i do not go the n kink route. I think this is also an issue with copper LP lines if I am not mistaken.
If real world experience has shown that 5 or 6 years hard lines are OK, i think i can skip the no kink lines.