change over from r-12 too 401-b

[kc8939]

hi, can anyone give me any problems with 401-b or what too look for in psi changes thanks ken

[R12rules]

http://www.refrigerants.com

HCFC - R401B

Similar to R-401A except higher in R-22 content. This blend has higher capacity at lower temperatures (matches R-12 around -30F), and also provides a closer match to R-500 at air conditioning temperatures.

It sounds like it is a drop in for low temp R-12. That would make it simular to MP-66.

None of my handy dandy PT charts have this gas listed so I cant comment on the pressures. Other than to say since it contains a slightly higher percentage of R-22 than does 401-A, it woudl run a little higher pressure.

But I'm NOT a scientist ... I just fix stuff. That's all.

Visit their site, maybe make a phone call.

MP-66 is easy to use and is very reliable. It is the chosen drop in for low temp R-12.

What ya workin on?

[icemeister]

R401B is in fact MP66, so just go with what R12 said.......he's right, it's the only one to use for LT R12 replacements.