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You'd have to purge the line to avoid contamination
which in those small lines would be hell to get out.
Last mini-split I put in (Sanyo 12KHS71) the manual
said to put a little (R410A compatible) refrigerant oil
on the flare connections.
I noticed they didn't do that on the show.
"When we build let us think we build forever. Let it not be for present delight nor for present use alone. Let it be such work that our descendants will thank us for, and let us think, as we lay stone upon stone, that a time is to come when these stones will be held sacred because our hands have touched them, and that men will say, as they look upon the labor and wrought substance of them, "See! This our fathers did for us."
John Ruskin (1819 - 1900)
We have installed 30+ Fujitsu mini splits, pipe cut square, reamed with tuning end facing the ground so pieces can't get into system. Properly flared so flare only covers about 3/4 of the flare face of the fitting. Wiped with some ester based oil and properly tightened. I have a set of torque wrenches CPS brand that I ordered at a Fujitsu school. About a C-note if I remember right.
1/4" 150 in lbs
3/8" 300 in lbs
1/2" 500 in lbs
5/8" 650 in lbs
Test the system side with nitrogen @500 psi. Not one leak on any one of these systems. Vac the system down to 1000 micron and your golden.
Proper installation of any thing is the key to no problems.
WE LIVE IN THE LAND OF THE FREE,
ONLY BECAUSE OF THE BRAVE
this is kinda off topic
but flare fittings are used on 3000 psi hydraulics, called JIC fittings, there 37 degree.
so the fitting is not necessary a low psi fitting,
I think the question may be is there better connections, and I do think there is.
Push sticks/blocks Save Fingers
"The true measure of a man is how he treats someone who can do him absolutely no good."
attributed to Samuel Johnson
PUBLIC NOTICE: Due to recent budget cuts, the rising cost of electricity, gas, and oil...plus the current state of the economy............the light at the end of the tunnel, has been turned off.
Thanks James. I don't want to beat it to death but want to make sure I get it.
The same lines doing the same thing on other systems can be connected with flared fittings?
Example: 2 Ton Trane Residential HVAC unit that sits outside on a pad.
The short answer is Yes.
For me a brazed connection is more desirable, but there are situations where a mechanical fitting is more suited. If you ever worked on larger tonnage compressors you would learn to appreciate mechanical connections like the Rotolock.
I've ran across many split systems that the connections were soft soldered together. Usually by plumbers who do hvac also or the local yokel handymen types who can only drop a bird turd with silfos.