Need vaccum pump and guages, some niotrogen to purge the line and pressure test to 250-300psi......Can be done yourself but it could cost you in the end..
250-300psi? You sure about that? Seems a bit light to me since 410a operates in ranges above that.
its all tools that hvac guys have handy and yess you absoultely need to facum all the helll out of the lines for like 2+ hours and if you got a vaccum pump make sure it holds the vacume or you got leaks purging with nitrogen is a redundant step that we do in hvac just to be sure.
but you doo need to run that vacum pump for a long time and also the vacum gets any mousture out of the lines , which will cause a catastrophic failure in the system if not removed. my pops is a hvac guy and we always talk about ac and shit like that.
You would NEVER purge a mini split line with nitrogen as there is absolutely no need to. The only time you run nitrogen through the lines is while brazing to avoid scaling on the inside of the lines or pressure testing. And since there is no brazing in putting in a mini split you simply wouldn't run nitrogen while tightening compression fittings. You would pressure test with nitrogen though.
As far as the vaccuum comment goes. LMFAO. 2hrs? Your pops pump must be old as dirt. We pump em down 20-30min. What we're lookin for is -30 psi.
For all of you guys doing your own I wish you luck. Fact is there is a lot more to installing these things than mounting them up.
For those of you that did your own did you pull a delta T? Did you make sure you had enough refrigerant for the run of line set? Did you run the condensate right? Is your pad level for the outdoor section? What's your line set look like running out your house or building? Is it cased?
And last but not least your all aware that you have absolutely NO WARRANTY right? Any manufacture in the business requires professional install and maintenance for their warranty. If you did it yourself and it goes to hell your screwed.
And one more point for all the numb skulls calling refrigerant freon. Do you guys know what "freon" is? Apparently not because if you did then you would be very aware that you can't even buy it anymore. Freon was a brand name from DuPont. The real terminology for this type of stuff is "Refrigerants". It has NOTHING to do with FREON. The most widely used refrigerants currently are R-22 and R-410a. So take this as advice. Especially if you want to walk into a hvac shop and act like you know what your talking about. The first sign your an idiot will be calling refrigerant freon. :D
