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These are the best gloves I have ever seen. They are breathable, highly flexible and strong gloves http://www.atg-glovesolutions.com/en/maxiflex-3/maxiflex-ultimate%E2%84%A2-8/34-874-34/ I always got...

I wonder If/When Milwaukee will make those copper swage heads for there ProPex Expander, The Heads and Expander part Look damn near identical in design to me....

Either someone else replaced the blades with the wrong ones a long time ago... Or You can reach around the back of the Evaporator, can you feel the coil all the way up and down the unit? Or is it a...

Great that there using them but bending a 45 and then a 90 would of looked way more professional... Professionalism is being lost in schools and getting it done quick and ugly is being taught...

You would of been better off with a 45 then a 90 instead of that crazy single bend coming out of the condenser, why is there so many joints right there too? Where ya short on pipe?

Also if your testing a system that's been pumped down or a new system with refrigerant in the condenser NEVER go above what the pressure would be in the condenser i.e. Press/Temp of ambient of the...

Your Coil is below freezing your gonna get a little frost. As long as the fans stay on and the box temp is above freezing it will defrost on off cycle. If it's really severe you can add a defrost...

lol yeah it took me awhile to get my previous co workers to understand temp glide. They have several 407c wall mount/pressurization units on some power houses in a refinery and they thought they...

That's the thing with temp glide. Its gonna be different for your low side and high side at the same pressure. Bubble Point on high side and Dew Point on low side.

Does look like a ten degree glide: http://www.certifiedrefrigerant.com/rms_engineering_comparison_report%20r421a.pdf

Are the compressors your using POE? Retrofit sheets say that it's compatible...

Kinda like shaking pop.... CO2 is dissolved in pop. Basically the same has happened with the refrigerant and oil. when you shake something with those conditions it causes it to go through a process...

15% will work but it's not nearly as strong as 45% for steel to copper....

Here's a company that makes portable Induction Heaters for brazing, imagine it would cost a pretty penny for one though. http://www.efd-induction.com/en/Applications/Brazing.aspx

Here's another...

I posted that link earlier...

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Some crankcase heaters work off of single pole contactors.... Also check this out: http://www.achrnews.com/articles/single-pole-and-double-pole-contactors

No You dont stop flowing, you just wait till all the oxygen is out of the pipe to start brazing. We continuously flow Nitrogen though the entire process. At a low flow your not putting any pressure...

The best way to do it If your really concerned about it buy your self a O2 Meter. Or figure up how many CF of pipe you roughly have and then you can figure up how long it will take to "PURGE" the...

http://www.sensorsone.com/series-or-parallel-250-ohm-resistor-to/

Id say use whatever your comfortable with. When it comes down to it we just want something that will prevent copper oxide from forming. whatever inert gas that works and is cost effective you can...

So what does your purity sheet show for Nitrogen from airgas?

So industrial Grade has roughly 16 ppm water vapor in it, while the atmosphere on average has 2500 ppm, And With oxygen the nitrogen bottle has 10 ppm while the atmosphere has on average 209,460 ppm....

http://www.rheem.com/documents/13pjl-consumer-literature :whistle:

http://www.imperialsupplies.com/grp513.shtml
http://www.imperialsupplies.com/item/0936130

If only we could find the 1/4", 3/8", 1/2" Crimp on Fittings for our systems.... There's gotta be a...

I would suggest you buy a couple electronics books and learn basic electricity and how circuits work. R doesn't have to be 24vAC on the newer stats it can be a mVDC to a couple dc batteries if you...