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R-134a Nitrogen leak testing

trip-l-jax on Fri May 22, 2009 8:55 PM User is offline

I have a question regarding nitrogen w/trace R-22 leak testing.
I have the EPA Section 609 MVAC certification and EPA Section 608 Type I.
What certication am I required to have to purchase R-22?
I am looking at various nitrogen leak test kits, one with the gauge and regulator, any one specific brand recommended?

Edited: Fri May 22, 2009 at 8:58 PM by trip-l-jax

Dougflas on Fri May 22, 2009 10:50 PM User is offline

If you're planning to use R22 with N2 for automotive leak testing, that is a bad choice. r22 will permemate the hoses thus leak thru them and give you false testing results. Use R134 as a trace gas with N2.

trip-l-jax on Fri May 22, 2009 11:16 PM User is offline

I have read that some prefer just the nitrogen.

Dougflas on Sat May 23, 2009 9:11 AM User is offline

most leak detectors won't pick up N2 only. That is why you would use a trace gas.

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