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Tool Talk Discussion Forum

Re: Recharging Refrigerant

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George Marsh

06-24-2014 04:20:16

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The fitting on a can of 134a is different from r12, so you will need to buy an adaptor.

I have 40 year old dehumidifiers that leaked out all the r12. I pulled a vacuum and filled with 134a. They work fine. I also installed an old thermostat from westinghouse a/c on the suction line, so if the suction line frosts up it turns compressor off. I just wish I hadn't pitched so many of the frost controls.

Then I removed all the electrical controls from dehumidifiers and put them under water to look for leaks, found none. So my leaks are extremely small. So far, 6 months later,my 2 dehumidifiers are working just fine.

I look at it this way, anything using r12 is very old so if you get a few more years out of it using 134a I'm not going to worry about the oil. The unit is on borrowed time.

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06-24-2014 07:25:17

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 Re: Recharging Refrigerant in reply to George Marsh, 06-24-2014 04:20:16  
I'm thinking the r12 and 134 would interchange. Since I have a can of 12, might as well find it a good use before the can rusts out!

Next time, if it's still alive, I'll go to 134.

It is probably 40 years old, just hate to junk it, everything else works good. It's mechanical, I can work on it!

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