ReplyWhite paste flux, and 45% silver.
Regular Guest
Good evening HVAC Guru's,
What is the best method to braze 7/8 and 3/8 HVAC copper line set to brass service valve. Any help will be welcome.
Thanks in advance
Professional Member*
White paste flux, and 45% silver.
Professional Member*
Welcome here by the way, you will get more answers if you post in the tech to tech chat section.
Professional Member
Better yet, I can just move it there...Originally Posted by Chuck
Moved this to tech to tech chat
Professional Member*
Professional Member
Flux coated 45% silver rods work well.
Professional Member*
What everyone said above +
The best method is the one that when done not only meets the manufacturer's specifications, it also doesn't damage the service valves.
Don't forget the nitrogen.
Use the biggest hammer you like, pounding a square peg into a round hole does not equal a proper fit.
Professional Member*
Stay-Silv 15 and white flux.
With your chrome heart shining in the sun, long may you run.
Professional Member*/ARP Committee
It's not brass.
but, for the goodman condenser your installing, dynaflow.
"Better tell the sandman to stay away, because we're gonna be workin on this one all night."
"Dude, you need more than 2 wires to a condenser to run a 2 stage heatpump."
"Just get it done son."
Dad adjusted
Regular Guest
Thanks for the tips. Seems like White paste flux, and 45% silver is the "method of choice"
Yes I'll be using nitrogen.
Professional Member*
5-15% silphos is all you need for connecting the copper line set to the service valve stubs on a condenser if that's what you're doing.
Professional Member*
True
Professional Member*
x3
45% and flux is over kill( that is used for true solid brass/stainless) and 15 stay-silv/silfoss etc etc is all you need NO FLUX but pull valve caps, shroeder cores, a good wet rag over valves plus a good oxy/acet rig with good hot heat go fast and true then pour water over repair area immediately after your done.. check for leaks with Nitro, 250 for 22 and 400 plus for 410, and your golden..
Professional Member*
On copper to copper, no flux is needed with 15% silver solder.
On copper to brass, per manufacturers instructions, 15% silver solder is ok, but flux must be used.
Remember, Air Conditioning begins with AIR.
Professional Member*
You got that right. Dynaflow works just as well (almost identical temperature range) as 15% silphos and at half the price. Thank you very much
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Professional Member*
but a service valve on most resi and light comm units arent solid brass and ive never in 15 years used flux on these connections..i assume thats what he meant..I realize that solid brass and SS would require some 45 or higher stick and ive used the ones with flux built into the rod..
Regular Guest
This is “NEW INFO” From the research I’ve done indicated not to use rods with “PHOSPHORUS” when brazing copper to brass ????.
I’ve already brazed the other sections of copper with Harris stay-silv 15%.
We are installing a Goodman GSX and the service valve stubs looks like BRASS (was not too certain) glad I asked. And the instructions state a minimum of 2% silver and NOT TO USE FLUX.
But if The seasoned vets say its oK to use 15% ( I have that rods) then I’m set.
Thanks again for all the valuable tips
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