Idiots pull out a micron gauge for a vac. test. Unless your pumping down a 20 ton system that a compressor blew up on.
A ductless..put a 7cfm vac. pump on it and it will be good in .2 mins.
I use a dig. gauge set that has micron on it.
Like i said idk what install you have. If your running max. lengths compute the difference, weigh in charge.
If your system dosnt have a min/max designed rate...distance=
"lenient"
Pump down syst. brake the vacuum with liquid 410a bringing to 10psi.
And open the valves on the condenser.
Turn the thing on...
If this dosnt make sense idk what to tell you. But if i started this system up for you and you asked me for the stuff you said, id walk away.
And yes i own a commercial company, but would treat you fair.
These go installed 2500-3000 a head here
Not needed but i usually 2x evac a multi head system. This is not needed though.
With everything ive said, me/ my guys have installed 2000+ of these systems a year. And ive done 3 commercial systems this year with 20 indoor units a system.
Just tying to help. as you give no info,
idiots pull out a micron gauge? Every single shred of evidence regarding these, including the training course I took at LG, said using a micron gauge for vac is important....
Also what did I ask for?
I don't want to deal with any of this to be honest, I just want to hire someone that is honest and does it the correct way and pay them a fair price.
Yes I pissed off the hvac contractors, but what else am I supposed to do, let them screw it up? I want to hire someone long term. Can't just let them do their thing with no oversite on the first one. You may be the worlds best hvac company, but I don't know that until I see your work.
Worst one was the guy told me I should just use the flares on the linesets. I kept saying that is a bad plan, and we should use the ones that come from LG and reflare them. I listened to him because he's the "expert". I would say about half of the connections leaked from this.
Why I think a micron is important. About 5 out of the 80 connections held the nitrogen with no noticeable loss in pressure and passed the bubble test. When I pulled the VAC, (I did 20 in 1 day) I was able to locate these bad connections just because of the micron gauge. The ones that had no leaks would pull down to 50 microns within 5 minutes, and then level off. I had 5 units that no matter what I did, the micron reading would not level off, found leak. These are leaks that were so small it'd probably take atleast a year for the system to show signs of not working.
Another hvac issue - had my trusted tech, who is no doubt an experienced pro, who I've been working with for a long time, go to repair a 20 ton system because I received a call the AC wasn't working. He said it was low and he put refridgerant in. I get a call 2 months later from the tenant that it's 95 degrees out and the air conditioner can't keep up. I call up the hvac tech, and you know what he tells me, I emptied what I had in the truck but didn't have time to go get more! He thought that was no big deal!
How much money did I lose in electric because that thing was low on refrigerant and could not keep up? It probably ran constantly! What if it had gone on like this for years? I think it just evolves into common practice over the years to simply ensure the system is working, and there is very little emphasis on efficiency since the person who is paying for the utilities will likely never know and be just as happy. I mean you do thousands of hvac installs, and everybody is satisfied, why the hell would you ensure it's running at peak efficiency....integrity?
