Leak test?

[EliTheIceman]

How do you leak test during an install/repair? The guys I work with call it good if they pull a vacuum down past 500. I just had this fail for me so now I've been valving off the pump and making sure I don't raise past 1000 microns. I'm wondering what others do & what is considered the best way to rest assured there will be no call back.

[BALloyd]

You should be pressure testing the system first with nitrogen to ensure no leaks.

[FrostyBeer]

Run your line set first and all hooked up. Then leave in a pressure test until the rest of the job is finished.

[ibrac54]

Pressure test with nitrogen before pulling vacuum. The nitrogen will also remove some moisture if the system has been open for a while. We try to shoot for 300-400 micron vacuum and let it stand for 30 min or so.

[Achicagoperator]

Pressure test with your inert gas,let stand,pull your vacuum 300 to 500 microns,let stand,should be ready to charge.

[kls-ccc]

pressure test joints with combo of nitro and refrig, jusst enough the leak detecter could pick it up, pull a vac to below 300, blank off pump and watch to see it it raises above 500 in less than a min. If it does you either have a leak or moisture.

[shaworth1]

i pressure test with nitrogen and make sure it holds then pull vacuum 500 microns make sure it holds and when all good, charge.