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Manifold gauge question

70monte on Tue July 29, 2008 12:46 PM User is offline

Country of Origin: United States

I know the preferred thing is to have two seperate manifolds when working with two different refrigerants such as R-12 & R-134a, but I have a set of hoses for both R12 & R134a for my Robinair gauge set. What is the best way to clear the manifold when using both types of refrigerant so that you don't contaminate each type of system? Do I just open the gauge wheels briefly with whatever refrigerant that I'm using at the time. Thanks.

Wayne

iceman2555 on Tue July 29, 2008 2:10 PM User is offlineView users profile

The correct and legal method is to attach the manifold to a recovery machine and recover the base refrigerant.

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The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

iceman2555 on Tue July 29, 2008 2:10 PM User is offlineView users profile

The correct and legal method is to attach the manifold to a recovery machine and recover the base refrigerant.

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The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

70monte on Tue July 29, 2008 3:06 PM User is offline

Thanks for the reply. Since I do not have a recovery machine, is there enough refrigerant left in the manifold to contaminate the different refrigerants to the point where the system will have problems?

For example, if I last used the manifold for R134a and then went to use the same manifold to check my R12 car without clearing out the R134a, will there be enough R134a left to contaminate the R12 to the point where it won't cool correctly?

Wayne

TRB on Tue July 29, 2008 3:38 PM User is offlineView users profile

Vent the hose and don't worry about it. You have people using all sorts of illegal refrigerants. Venting a small amount of legal refrigerant is not an issue.

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Cussboy on Tue July 29, 2008 7:05 PM User is offline

Purge the hoses/manifold with a tiny amount of the refrigerant you will be using next, you'd purge out any air anyway. There'd only be a tiny amount (or none) of any previous refrigerant left anyway. I personally use the same R12 gauge set with adapter hoses and quick-connects when I do R134a. Some refrigerant gets into the atmosphere when one disconnects even quick-connects, that's just the way it is.

70monte on Tue July 29, 2008 7:33 PM User is offline

Thanks guys, that is what I will do.

Wayne

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