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-   -   brazing in a new coil (http://www.diychatroom.com/f17/brazing-new-coil-144853/)

slash5bmw 05-25-2012 10:20 PM

brazing in a new coil
 
My brother has a coil that is freezing over, rusted and the unit is low on refrigerant.
I have an oxy/acetylene setup so I was going to attempt to braze on a new coil.

The questions I have are the following:
Do I cut the old coil out with a copper pipe cutter and use a union to put the new coil in?

I was going to run nitrogen through the system while I brazed the coil in.

After the coil is brazed, I am going to fill the system with 150lbs of nitrogen and check for leaks. Then the system would need a vacuum pulled and filled with r22.

Does this sound right?

Thx

Slash

biggles 05-26-2012 04:40 AM

just cut the lines as close the the old one clean them up and the couple or slip them into the new coil.new coil might have swedged ends so the exsisting pipes slip in.might want to go with just a turbo torch on the liquid(TXV watch the heat) and stay brite on the suction.it is only 2 connection so you should be tight if you flux and do a nice braze.:wink: pipes aren't that big watch the heat..vac and charge then is the follow up:thumbsup:

COLDIRON 05-26-2012 06:49 AM

Stay Brite #8 that's the ticket, been using it for 45 years no leaks except where I F----- up. Good stuff flows low temps and holds 15000#.

I use it on suction and liquid lines. No extra heat, no nitro, no interior flaking.

slash5bmw 05-26-2012 09:46 AM

Thanks for the replies.
I have a propane torch and an oxy/acetylene setup.
Do you use the SB8 similar to how you would solder/sweat a plumbing pipe? e.g. clean the pipes, flux the copper, connect the copper, heat and pipes and then push the sb8 against the copper so it runs around the copper?

Is it possible to use a propane torch to solder in the coil?
If not, can I use the oxy/acetylene? I could just apply the heat from the oxy/acetylene just enough for the sb8 to melt around the pipe.

1 last thing. Can I heat the old coil and pull it apart or does it need to be cut with one of those small copper pipe cutters?

Thx again.

Slash


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