Marine A/C R22 conversion

[Captndave1]

I have a 6500 BTU marine A/c in my boat and it uses R22 freon, I would like to convert to newer type freon, but I need to determine if it is feasable. Someone out there have any solutions?

[pesarsten]

From a technical standpoint it can be done, but, you will have to by pay to have the system evacuated, and thoroughly flushed, then any non compatible parts changed out.

For what you will invest, you would be smarter to just replace the unit, and have a new unit with a new warranty.

[Sailmonkey]

You'll spend more doing this than the old unit is worth.


Is there a current leak or other problem with your AC that makes you want to do this?

[Captndave1]

I have the equipment to do the change, but I need to know what I might need besides replacing the oil, dryer, and flushing. I have done some a/c work, but all I have read leaves me unsure if this is possible.

[Sailmonkey]

Originally Posted by Captndave1

I have the equipment to do the change, but I need to know what I might need besides replacing the oil, dryer, and flushing. I have done some a/c work, but all I have read leaves me unsure if this is possible.

But why do it at all?

And it is doable......

http://www.comstarproducts.com/rs-44-refrigerant

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[redsky49]

There are substitute refrigerants available, as noted above, as well as existing R-22 supplies. It seems that more than a few people have a cache of R-22, either recovered or stashed away prior to the end of manufacturing. Ask around.

Have you lost refrigerant in your current system?

[bstreep]

As said, either top off with r-22, or replace. There is no good reason to change, and several bad ones. If you have a leak, fix it.


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[andypapad]

Hello Dave,

I have experience with light commercial and domestic AC maintenance.
There are direct replacements for R22 requiring no change is capillary tubes or expansion valves, dryers, oil etc. a few years ago I Installed R22 based Condensing units and filled them with the replacement refrigerant M099 from Dupont. They are still running 5 years later.
Here is a short marketing blurb from Dupont.

"Freon™ MO99 is the closest match to R-22 of all "no oil change" replacement refrigerants. It is compatible with all traditional and new lubricants. Compare MO99 to other R-22 replacement products. Freon™ MO99 matches R-22 in terms of capacity and efficiency in most systems, but with a significantly lower discharge temperature that may prolong the life of the compressor. MO99 is compatible with mineral oil and POE oil providing a quick, cost-effective R-22 replacement, and can be topped off during service without removing the entire refrigerant charge. For most R-22 systems, when retrofitting to Freon™ MO99, all you need to do is recover the R-22, replace critical seals, charge refrigerant, restart and monitor for leaks, label the system with a Freon™ MO99 retrofit label, and you're done. R-22 replacement can’t get any easier."
I stopped doing AC work but have some left over MO99 you can ave for free!

[motion30]

R407c. is a very popular replacement for R22. Compatible with Your oi. And all existing components

[Captndave1]

Most interesting, where are you, I wouldn't want to try to ship it, but if you are not too far away, i would pick it up.

[andypapad]

Rye Brook, NY

[Captndave1]

Too far to work for me, I will at this point try to find the leak and top up with r22.