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HVAC question

befuddled on Mon September 08, 2008 10:20 AM User is offline

I know this is a mobile air site, but I wonder if you would indulge an old guy with a HVAC question. I am curious as to what is used to solder the solder joints on the copper lines between the outside unit and the inside unit. It is clearly soldered, and clearly not water pipe solder. Thanks.

Edited: Mon September 08, 2008 at 10:21 AM by befuddled

mk378 on Mon September 08, 2008 11:33 AM User is offline

If the "solder" looks like melted copper, it's brazed with "silphos" an alloy of copper, silver and phosphorus. The silver lowers the melting point to somewhat below that of pure copper (though joints still need to be heated nearly red-hot). The phosphorus makes the alloy "self-fluxing". This material is great for joining copper to copper but it doesn't work for anything else.

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