I like to use Stay Brite and Stay Clean flux. Does a great job, not much heat, will hold pressure well above 700 lbs., flow around compression fitting really well, and do not forget to wash away the flux it will turn the brass and copper alittle green. If the techs would have used hard draw copper the chance of a leak was small, but they used soft draw copper and it is to soft for the compression fitting so you solder.

Good Luck

 

brass rod and a can of flux. heat the brass and copper with most of the heat on the brass or you'll burn holes in the copper. use lots of flux and slowly feed the rod into the flame. its best to just cut the entire fitting out expand the copper pipe ends and install a piece of copper pipe between them. copper to copper is easy to braze.

 

Brass pin holes and leaks. Where did you get that from?

 

Vet

Thanks for the Info, I have tried both methods but I do think now looking back that I had too hot a flame and I heated the copper too much and just burning holes in the copper. If it wasnt on an aluminum carrier coil I would just braze straight into the suction and liquid line inside the coil.

 

Thanks for the Info, I have tried both methods but I do think now looking back that I had too hot a flame and I heated the copper too much and just burning holes in the copper. If it wasnt on an aluminum carrier coil I would just braze straight into the suction and liquid line inside the coil.

Vet use stay brite or better yet is 45% silver solder with acid paste flux (The white stuff) you can use mapp gas. It's melting point is well below brass or sil foss. Around 1100*f.

 

brazing

Thanks for the info hvaclover I have never tried that but Im going to give it a test drive on a seperate peice before i commit myself to ruining the actual part just to get use to its flow and heat rate. again thanks a lot for this Info,you would think after all these years I would have stumbled on this at some time, but Till now I never had so many aluminum coil leaks at compression fittings. Learning some thing new in this industry is a never ending story,people out side this field have no clues at all.

 

Thanks for the info hvaclover I have never tried that but Im going to give it a test drive on a seperate peice before i commit myself to ruining the actual part just to get use to its flow and heat rate. again thanks a lot for this Info,you would think after all these years I would have stumbled on this at some time, but Till now I never had so many aluminum coil leaks at compression fittings. Learning some thing new in this industry is a never ending story,people out side this field have no clues at all.

Got plenty of initiation of copper to steel when I did domestic rerigs.

Think of it like soft soldering, watch that flux. when it boils back off flame and hit it.

Cleanliness is Paramount, sand everything. I even sand the silver solder before use.

 

why dont you apply for a pro membership? plenty of info on topics like this and everything else you may run into during a workday (or night). you got your post count covered for sure.

 

Pro-Mrhorsepower

My E.P.A. card # is my social # and is that safe over the net? I have 32 years in this area starting out as a goffer to lead tech on up to service in 85.I also held Texas contractors license up till last year when I moved back up to my home state and City St. Louis Missouri,Like you and the other pros here ive been certified in everything it seems for residential A/C work you guys know the drill. Thanks for the heads up I did send some Info to the pro section I will just have to waite and see,I understand that they have a good site to protect from those outside the field.Thank you once again and have a great summer.

 

My E.P.A. card # is my social # and is that safe over the net? I have 32 years in this area starting out as a goffer to lead tech on up to service in 85.I also held Texas contractors license up till last year when I moved back up to my home state and City St. Louis Missouri,Like you and the other pros here ive been certified in everything it seems for residential A/C work you guys know the drill. Thanks for the heads up I did send some Info to the pro section I will just have to waite and see,I understand that they have a good site to protect from those outside the field.Thank you once again and have a great summer.

This is a great place for us old guys We get group rates on depends.

Welcome.

 

Vet you will find a lot of great info here. Imho copper to steel should be done with 45% silver. I am 100 miles south of you.

 

brazing tips

actully Im trying to braze copper to brass, those carrier aluminum evap coils with copression fittings that always seem to leak over time. I tried once on an old coil but with no success just melting the copper but I now have some other things to try, thanks to all you other tech's. your never to old to learn this field changes almost every day,if customers only knew that we make it look easy because of our on going traning or just wanting to be good at what we do. Again thank you for the Info and have a great weekend.