How important is it to braze with Ntirogen and use a vac gauge? Does it even matter?
How important is it to braze with Ntirogen and use a vac gauge?
cswenson701
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How important is it to braze with Ntirogen and use a vac gauge? Does it even matter?
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Do a search for this. There was a thread not long ago debating it quite thoroughly.
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I'm sorry...a micrometer. I haven't used one since tech school and forgot what they were called.
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Surprised I didn't call it a multimeter. Don't use it, you forget what it is. Yes...I will do the search. Thank you.
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I like this analogy
after watching a few videos of with or without nitrogen, I do my best to have nitrogen flowing on every joint.
http://www.youtube.com/watch?v=Bpqxbc9XQ5Y
I have no affiliation with the makers of this vid just think its a good demonstration
http://www.youtube.com/watch?v=Bpqxbc9XQ5Y
I have no affiliation with the makers of this vid just think its a good demonstration
There is one other hvac tech I know that flows nitrogen while brazing and uses a micron guage while vacuuming. Everyone else vacuums through the manifold and when it gets to 30" its good. Most of the guys I know don't even purge their hoses when hooking up to a system. I do the best I know how and that is why I flow nitro and use a micron guage.
30" of vacuum does not exist on this planet-----thus one more reason for a micron thermister type micron measuring device.
If you ask most people around here how they pull a vacuum they say "I hooked my vacuum pump up and my blue gauge pulled right down to negative 30 so its good to go".
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it just makes too much sense to not do it, I've seen the crap that comes out of the lines when not flowing, I've even not done it myself in the old days, kind of feel ashamed at the thought of just how much "stuff" was left inside after a brand new cooler/freezer install, with long line runs and lots of fittings. thank goodness better practices came along and systems have a much better chance to live a long and healthy life !
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For most it probly depends on the situation.
Sometimes you do whatcha gotta do
If im slammed with work , and all I did was fix a leak , the unit will most likely get a 10 minute vac while im packing up , and im outta there
Its better than some guys i know "awe just push the air out by leaving the shrader open on other side while releasing refrig
"
Sometimes you do whatcha gotta do
If im slammed with work , and all I did was fix a leak , the unit will most likely get a 10 minute vac while im packing up , and im outta there
Its better than some guys i know "awe just push the air out by leaving the shrader open on other side while releasing refrig
"
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There is a right way and a wrong way to do things. There's also a lot of little "in between" ways to do things.
I've probably done every one of them over the years. :angel:
We all know what is right and what is wrong. Most of us who have been around for a few years also know what we can "get away with" if we need to.
I've probably done every one of them over the years. :angel:
We all know what is right and what is wrong. Most of us who have been around for a few years also know what we can "get away with" if we need to.
Keep in mind that you can also use argon or CO2 instead of nitrogen for brazing. (They're generally not used since they're more expensive.) In a pinch, air duster can be used for leak finding (though less effective than nitrogen), removing dirt and water from piping, and breaking the vacuum for triple evacuation, but not for brazing.
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