R-12 to R-134 conversion - ZR-1 Net Registry Forums

mhobtr · 03-31-2021

I don't know about the high pressure switch but the low pressure switch is adjustable by turning a screw between the terminals.

The low pressure cut off is 2 lbs lower for R12 than R134a but the switches are the same. If you buy a new replacement, it will be set for R134a.

I'm still running R12 and I discovered this when I had to replace a faulty LPS.

03-31-2021	#13
mhobtr Join Date: Apr 2016 Location: Birmingham, Alabama Posts: 60	Re: R-12 to R-134 conversion I don't know about the high pressure switch but the low pressure switch is adjustable by turning a screw between the terminals. The low pressure cut off is 2 lbs lower for R12 than R134a but the switches are the same. If you buy a new replacement, it will be set for R134a. I'm still running R12 and I discovered this when I had to replace a faulty LPS.