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Old 11-27-2006, 10:04 AM   #1
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Leak Test w/compressed air

Yes, I know it's a big no/no to every do a leak test with compressed air or oxygen AND refrigerants.

However for a new install is it OK to leak test just the lineset and coil with compressed air prior to evacuation and opening the HP valves?

I believe coils come with a holding charge of nitrogen. So why would compressed air mixed with nitrogen be a concern?


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Old 11-27-2006, 10:12 AM   #2
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Hi hennyh

I would advise against using compressed air for a leak checking media. There is more in compressed air than just moisture. This does not however mean that you cannot use air. When you introduce the air if it is from a oil type air compressor it will always have a trace amount of oil in the air. The oil that is in your compressor will gum up when it comes in contact with the mineral or poe oils, this will cause problems with the refrigerant metering devices. An oiless compressor would be a safer bet if you are going to use air.

Good luck


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Old 11-27-2006, 04:36 PM   #3
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Nitrogen is the only acceptable medium in a refridgeration system for leak testing. It is inert and will not contaminate the system.
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