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Old 10-11-2008, 01:29 PM
Matt L Matt L is offline
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Join Date: Oct 2005
Posts: 4,263
If the air is dry and the system has no 134a in it, air probably won't hurt anything. However, you should not introduce any air under pressure in the presence of 134a, as the mixture is flammable at pressures above about 5 psi.

A better test is to use 4 oz of R22 and pressurized nitrogen. Then you can use an electronic leak detector to find the leak if you see a pressure drop. This mixture is legal to vent to the atmosphere. I know, I don't have either of these around here either.
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