Pressure Test Mini Split with air instead of Nitrogen?

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Originally Posted by BradC

Err.. unless you plan on raising the temperature of your hoses and lineset to the same as the tank this is not going to work the way you think it will.

What will happen is as you raise the tank pressure gas will immediately start to condense in your hoses and lineset. This will continue until they are completely full of liquid, at which time the overall pressure will start to increase toward your desired test pressure.

You will then need to re-cool the tank below the temperature of your lines and hoses to allow the liquid to migrate back to the tank before disconnecting things.

My intension was only to give a choice for temperary/quick raise of pressure.
That time one could make the soap/foam-test for the system if one feel that is necessary when using those "Helium tight" connectors mentioned earlier.Using propane (BBQ) is not a good way to raise the pressure ,but it is one way when there is a lack of other options.

Instead of N2 ,Argon could be used as well but these have to be purged away afterwards or vacuumed!

When having traditional flare connection ,proper pressure test is a must!And retightening of nuts within forthcoming 5 years!

If the lines purged by propane ,only let the extra pressure leak out (into the well ventilated air) before tightening the nuts .It is not illegal.

Acc. to ARI 700 standard there may be 0,5% condensebles left (other than HFC) in the system , .pdf 19/24

http://www.ahrinet.org/App_Content/a...%20and%202.pdf