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Old 12-22-2012, 11:45 PM
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Home A/C a-coil for a air compressor air dryer?

I have been reading it is a good idea to cool the air coming from the pump before it goes to the tank and have a water trap after the cooler. Alot of guys have used an automotive evaporator or condenser to cool the air. I have an old a-coil from home unit and was thinking of using it. I was going to plumb it between the pump and tank and have a water trap before it goes into the tank. Also would add a fan to blow into the a-coil just like your furnace does to dissipate the heat. Of course I would have to eliminate the expansion valve on the a-coil to remove that restriction.
Any thoughts?

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Old 12-23-2012, 08:29 AM
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Quote:
Originally Posted by kevs79 View Post
I have been reading it is a good idea to cool the air coming from the pump before it goes to the tank and have a water trap after the cooler. Alot of guys have used an automotive evaporator or condenser to cool the air. I have an old a-coil from home unit and was thinking of using it. I was going to plumb it between the pump and tank and have a water trap before it goes into the tank. Also would add a fan to blow into the a-coil just like your furnace does to dissipate the heat. Of course I would have to eliminate the expansion valve on the a-coil to remove that restriction.
Any thoughts?
The only things I can think of are 1) be sure the coil is internally clean and 2) what's the tube size? If it's too small, it could be a restriction to flow rate.
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Old 12-23-2012, 08:43 AM
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Is the A coil the condenser or the evaporator? I would think the condenser would be more effective though either would be an improvement. You will also need a catch tank for the water that will condense out as the air cools.

John L

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Old 12-23-2012, 08:50 AM
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As far as restrictions go, it looks to be ok. It has a 3/8(I think) small line going in and that splits off into smaller 1/4(I think) lines an goes into the core.
The a-coil is the evaporator portion that is in the house above the furnace fan. The condensor is the part outside and would be way too big to mount anywhere. I have that unit also and was going to scrap it.
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Old 12-23-2012, 09:38 AM
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Of course you are right. I engaged my typing finger before I put my brain in gear. I was thinking of automotive unit. I would think the home evaporator would work great. You would need to have a small tank to catch the water before it got to your compressor tank but that should not be too hard to find either. This is something I have also wanted to do. I hope you will post your progress along with a few pictures as you go. Good luck.

John L
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Old 12-24-2012, 04:26 PM
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The more I think about it the more i am leaning towards a trans cooler or condensor from a car/truck. The a-coil is so big and takes up alot of room I don't have. I can pick up a trans cooler from the local pick n pull for 10.00 and it would be small enough that it would not take up much room.
I am thinking going up the wall from my compressor to the cooler, then out of the cooler down to a tee w/a leg w/a drain at the end, then back to the tank.
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Old 12-24-2012, 07:17 PM
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Quote:
Originally Posted by kevs79 View Post
The more I think about it the more i am leaning towards a trans cooler or condensor from a car/truck. The a-coil is so big and takes up alot of room I don't have. I can pick up a trans cooler from the local pick n pull for 10.00 and it would be small enough that it would not take up much room.
I am thinking going up the wall from my compressor to the cooler, then out of the cooler down to a tee w/a leg w/a drain at the end, then back to the tank.
That will work but I think you may get more water than you think. I would be tempted to pick up a 10 gallon air tank and run through it to catch the condensation.

Please let us know how it works out.

John L
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Old 12-26-2012, 05:10 AM
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Make sure you wash it out real good, a/c or transcooler. They both have had oil in them.
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Old 12-28-2012, 06:27 AM
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Got a new camera,see if this works.One is the "infamous" Franzinator....with external cooling coil(total loss system,IOWs 1/4" tubing taps into water supply but instead of tying back in,it simply fills a bucket.Only use this when AC is runnin non-stop.....and the water is simply adj to dribble).

The other pic is a copper coil.Its 3/4 that was simply coiled around a big sander drum or sumthing?Anyway its gonna be installed after comp.....

I need to tig up another expansion chamber on comp outlet...then plumb the above coil in....just need the time to do it....duh.

Good luck with your system.
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Old 12-28-2012, 08:45 AM
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Make sure you wash it out real good, a/c or transcooler. They both have had oil in them.
How much pressure is a trans cooler designed to handle?

John L
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Old 12-31-2012, 05:13 PM
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This is what I made, and it seems to work very well.
Yes it has ball valves on every vertical drop.

Very little moisture ever makes it to the water trap.
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Old 01-06-2013, 10:58 AM
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Air

I did one just like yours 66. I can run my blasting cabinate now that I did. It works great at a good cost.
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Old 01-06-2013, 09:28 PM
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Originally Posted by 66GMC View Post

This is what I made, and it seems to work very well.
Yes it has ball valves on every vertical drop.

Very little moisture ever makes it to the water trap.
Is that 1/2 copper tubing? Are there 4 valves on the wall(1 in each "u" and 1 on each drop at each end?
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Old 01-07-2013, 11:23 AM
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Originally Posted by kevs79 View Post
Is that 1/2 copper tubing? Are there 4 valves on the wall(1 in each "u" and 1 on each drop at each end?
Yes, you're correct on both counts.

I used (expensive) ball valves like these ones on each of those 4 locations, and came up with a conglomeration of sweat-on fittings (don't trust compression fittings with 125 PSI) with swivels to allow for dissasembly if needed.
I pretty much cleaned out the local plumbing supply ...












A little later on, I found some sweat-on mini valves and used them for the outlet drops. Yes, every outlet has a drop and a ball valve so that moisture can be ejected.

Maybe I'll take some more pics after I clean up my messy garage. LOL
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Old 01-07-2013, 12:52 PM
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I've just added this, and a few more pics of this to my project journal.
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