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

[4020guru]

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?
 

[mecanik69]

leave it r12 r134a sucks.
 

[Tx Jim]

My 4255 cools better on R134a than it ever did on R12.
 

[BushogPapa]

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..
 

[mattwillson]

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.
 

[Bob]

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.
 

[4020guru]

Hey Bob, what is a BUSTARD refrigerant? Do I have to replace the compressor to get all of the oil out ?
 

[4020guru]

Hey Brushhogpapa, how many OZ. are in your 1/2 bottle ?
 

[BushogPapa]

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

I could weigh it..

Ron..