Copper pipe connections for fridge / freezer / aircon

[a64pilot]

MAPP looks just like a little propane tank and will burn fine in the same torch, just a yellow bottle and gets much hotter than propane, not oxy acetylene hot, but hot enough for silver solder. I use MAPP even when just soldering plumbing pipes, not needed but it's faster cause it's hotter.


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[Sailmonkey]

Be forewarned though.....the smell of mapp gas is nauseating.


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[SV THIRD DAY]

Originally Posted by ErikFinn

Something like this would be ok?

Bernzomatic TS4000KC Trigger Start Torch Kit-TS4000KC - The Home Depot

That would work fine...

[ErikFinn]

Thanks for replies guys...
how about the filter dryer..?

Originally Posted by ErikFinn

Another thought about brazing: I have a fixed critical orifice system (like Rich would call it) with a thin rolled evaporator plate and no filter dryer.

I believe these cheaper systems without a filter are more prone to contamination during any tampering with the closed system than Rich's top of the line Coolblue with a big filter.

Could I add a filter dryer to my system? Or to any similar system for that matter? If yes, where exactly should it go?

(should pull long vacuum and fill gas to about 95 to 100% plate frost after I reckon)

[SV THIRD DAY]

Originally Posted by ErikFinn

Thanks for replies guys...
how about the filter dryer..?

They just don't add a larger one for cost sake, so you can add a larger filter/drier to your system...its certainly not going to hurt anything.

[ErikFinn]

Originally Posted by SV THIRD DAY

They just don't add a larger one for cost sake, so you can add a larger filter/drier to your system...its certainly not going to hurt anything.

When you say they don't add a LARGER one, does that mean that there is already a small one in there that I just can recognize? Or do you mean there is nothing at all? And..But.. filters only cost a few bucks. right?

Where in the closed circuit should I install one for a fco system?

[SV THIRD DAY]

All systems have filter/driers and if yours already has one I wouldn't mess with adding another one, you are wasting time/energy in my opinion. Ours is larger because is servers a different purpose as a storage space for refrigerant to wait for the TXV to call for it...you don't need anything like that on a Critical Orifice system.

[boatnerd]

Ive used silfos15. Very light on the flux for refrigeration or can contaminate oil. Can be tricky to get the heat just right. Good to do a practice run on a seperate piece.. If it's turned black your too hot. ..

[ErikFinn]

Originally Posted by SV THIRD DAY

All systems have filter/driers and if yours already has one I wouldn't mess with adding another one, you are wasting time/energy in my opinion. Ours is larger because is servers a different purpose as a storage space for refrigerant to wait for the TXV to call for it...you don't need anything like that on a Critical Orifice system.

Oh, for some reason I was under the impression that these cheaper CFO systems do not have filters at all..
In that case my filter must be the finger size copper cylinder looking something like this (I'm not in the boat right so can't take a photo):

RParts.com - Spun Copper Filter-Dryer

I always thought that was something to aid in the condensing pressure/temp.. hehe

[ErikFinn]

Originally Posted by boatnerd

Ive used silfos15. Very light on the flux for refrigeration or can contaminate oil. Can be tricky to get the heat just right. Good to do a practice run on a seperate piece. Acetylene is much easier to control than mapp. If it's turned black your too hot. .
Sounds like you guys are making jewlery.

Thanks for post boatnerd.
I've never done this before and I'd like to do it correct the first time instead of screwing up my system so yea I kinda try to think of it as some kind of a gem...