turbo torch tip sizes

pecmsg

POE changed all that, as well as mini splits.
POE is a cleaning solvent, it scrubs the lines clean!
minis do NOT use filters they use screens. That carbon oxide plugs them

ratio

Flowing nitrogen is just plain good to do.

I suppose you can go over the top if you work at it a while, but the A2L protocols require it everywhere now, so giving my guys a choice to do it or not will just confuse them. ALL VRF systems require it for the extended warranty & likely the regular warranty. Flowing nitrogen will flush contaminates & moisture out of the lineset, your vac will pull down faster. You have to have the bottle out anyway for the pressure test.

No down side. Except, I guess, toting the bottles up the ladder to the roof. That's hard.

ChrisJ

https://forum.heatinghelp.com/discussion/comment/1854238#Comment_1854238

What size bottles do your guys use? 60s?

mattmia2

https://forum.heatinghelp.com/discussion/comment/1854238#Comment_1854238

pretty sure the manufacturers of r22 equipment required it too

Big Ed_4

Back in the days , we flushed the lines with R11 …. :)

EBEBRATT-Ed

You can also use Co2. We used that with the small aluminum tanks. It holds a lot more gas than a nitrogen tank and a lot less weight.

ChrisJ

https://forum.heatinghelp.com/discussion/comment/1854257#Comment_1854257

ratio

I use 40 cu ft bottles when I can, 80's when I can't, occasionally 125's, and once a (well, many, sequentially) manifold of 12x 200's.

Not sure about flowing CO₂ during brazing. I'd think that the temperatures may lend themselves to breaking down the CO₂ and then we're back where we started; but I admit to never having actually checked that such is the case. The bottle threads are different, IIRC.

EBEBRATT-Ed

CO2 is an inert gas like nitrogen

ChrisJ

https://forum.heatinghelp.com/discussion/comment/1853520#Comment_1853520

Older thread restart.

What size tank do you use with that A32?

Apparently even my A14 is way too big for a B tanks withdrawal rate?

If following the 1/7 rule you can't go over an A5?

I'm really confused now with everyone I see using MC tanks

I don't get it?

EBEBRATT-Ed

Going from memory I guess the reason for not overdrawing is not to pull the acetone out?

To tell the truth I never heard of checking the withdrawal from a B or MC tank.

Your probably technically right but I am not sure anyone ever worried about it.

I used to carry 2 "B"s and 1 "MC" in my van so I could solder or braze.

I had an A-32 and used it some (not a ton) and never had an issue.

But if we were on a job with tons of soldering (and since acetylene prices are $$$) I had a couple of propane turbotorch set ups at the shop because

Propane was so much cheaper and

If we were out of town or in a remote location with no supply house, you couldn't get acetylene, but you could fill a propane tank at a hardware store or home center or steal a barbecue grill tank. And if you had an aluminum propane tank (I forget the size) they weigh 1/2 of what a "B" tank weighs and you get probably twice the fuel out of it

And you can braze with propane but need the right tip because it is not as hot . Most times I would use Oxy Acetylene for brazing unless it was just a few smaller fittings. Regardless of the withdrawal rater you use a lot more with air/acetylene than oxy/acetylene

mattmia2

it is duty cycle too so it is average drawdown rate.

pecmsg

MC bottles are for one or 2 small joints.
b tanks for install.