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JD AC , how to retrofit r-12 to r134A ?????


 
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4020guru
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PostPosted: Mon Feb 04, 2013 11:17 am    Post subject: JD AC , how to retrofit r-12 to r134A ????? Reply to specific post Reply with quote

I am planning on replacing the r-12 refer to r134a. I have retrofitted home air conditioning and the question is, what is the process with a 4430? I will evacuate the system, will the compressor need to be changed? How about the expansion valve ? Do they have an expansion valve or a capillary tube?
 
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mecanik69
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PostPosted: Mon Feb 04, 2013 1:26 pm    Post subject: Re: JD AC , how to retrofit r-12 to r134A ????? Reply to specific post Reply with quote

leave it r12 r134a sucks.
 
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Tx Jim
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PostPosted: Mon Feb 04, 2013 2:12 pm    Post subject: Re: JD AC , how to retrofit r-12 to r134A ????? Reply to specific post Reply with quote


My 4255 cools better on R134a than it ever did on R12.
 
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BushogPapa
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PostPosted: Mon Feb 04, 2013 4:42 pm    Post subject: Re: JD AC , how to retrofit r-12 to r134A ????? Reply to specific post Reply with quote


I have never done anything but charge with R-134, even if some R-12 was still in there..NO Problem..
R-134 does need to run a higher Low-side pressure and I feel it cools better...
I have 1/2 a BOTTLE of R-12, if anyone wants to buy it...!!

Ron..
 
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mattwillson
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PostPosted: Mon Feb 04, 2013 4:43 pm    Post subject: Re: JD AC , how to retrofit r-12 to r134A ????? Reply to specific post Reply with quote

Just vacuum system really good and load it with r414a, it works well for me.414 isn't much more than r12 and is basically a direct replacement.
 
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Bob
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PostPosted: Mon Feb 04, 2013 7:55 pm    Post subject: Re: JD AC , how to retrofit r-12 to r134A ????? Reply to specific post Reply with quote

A few choices... Keep the original mineral oil refrigeration oil and run a b*u*s*t*a*r*d refrigerant like Freeze 12, or get all the mineral oil you can out of the system and install POE oil and R-134A, or COMPLETELY flush the system of mineral oil, replace the compressor and dryer, and install PAG oil and R-134A. The BEST and Deere-approved method is the latter.

DO NOT mix the original mineral oil and PAG oil. (Can you say "Jello"?)

...Bob, refrigeration tech, certified in mobile and stationary systems.
 
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4020guru
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PostPosted: Tue Feb 05, 2013 2:03 pm    Post subject: Re: JD AC , how to retrofit r-12 to r134A ????? Reply to specific post Reply with quote

Hey Bob, what is a BUSTARD refrigerant? Do I have to replace the compressor to get all of the oil out ?
 
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4020guru
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PostPosted: Tue Feb 05, 2013 2:04 pm    Post subject: Re: JD AC , how to retrofit r-12 to r134A ????? Reply to specific post Reply with quote

Hey Brushhogpapa, how many OZ. are in your 1/2 bottle ?
 
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BushogPapa
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PostPosted: Wed Feb 06, 2013 12:05 pm    Post subject: Re: JD AC , how to retrofit r-12 to r134A ????? Reply to specific post Reply with quote

ell, it was, I think a 20 lb bottle..I am sure it is at least 1/2 full..

I could weigh it..

Ron..
 
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