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Old 09-03-2011, 09:55 AM   #31
An old Tradesmen
 
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Purge and Deep Vacuum?


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Originally Posted by Doc Holliday View Post
There will always be oxidation as the last braze one can not flow nitrogen through as the opening is now gone as that last connection was where nitrogen was flowing from. Am I right or am I right?


Gotta go, I have a Goodman 4 ton condenser to install this morning that I will not be flowing nitrogen while brazing but I will be taking pics of the procedure I previously explained.
As Marty said, not if you pull the schraders and flow nitrogen that way.

If your worried about how much nitrogen your using. You can use one of these. http://www.google.com/products/catal...d=0CI0BEPMCMAM

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Old 09-03-2011, 10:56 AM   #32
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Purge and Deep Vacuum?


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If your worried about how much nitrogen your using. You can use one of these.
*** What's a good number for the flow?

- JerryK
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Old 09-03-2011, 11:28 AM   #33
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Purge and Deep Vacuum?


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Originally Posted by jerryk1234 View Post
*** What's a good number for the flow?

- JerryK
Just cracked open so the ball barely moves/floats.

Set nitrogen regulator to 50(or less if flow meter's rating is lower), then start out with full flow for a second or 2. Then close regulator, and shut flow valve. Open reg, and then adjust flow valve to barely float ball.

If your actually gonna braze the schrader whee your putting nitrogen in first, and then go inside and braze those joints, then come back out and finish the opposite line, no need to go full flow first.

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