Two stage fridge compressor build

[Gun Freak]

Wow what a waste

[Fnord]

You could just use the R22 for the first stage, then swap your original first stage compressor to the second stage. Not a perfect scenario but it'll work if you just want the thing running again.

[High-PSI]

Yes, this compressor is an ideal primary stage unit for sure. It is much higher volume.

Matt

[High-PSI]

Hey Guys,

I have some more info for you..........

First, I found that the old style start relays allow the compressor to stall and restart without waiting 60 seconds like the solid state relays do.

Next (and this is something cool I just learned), compressors have an LRA rating. I learned that stands for "Locked Rotor Amps". Most refrigerator compressors are rated at 10 to 16 LRA. Some are above 18. Well, I found a R22 dehumidifier compressor (piston style, not a rotory style) that is rated at 38.6! This is a unit that was given to me last week by a customer of mine. So, I installed it as my secondary and I could not be happier! For one thing, the lower rated compressors would stall out with anything over 40 psi inlet pressure. If I wanted to go above 400 psi output, I had to restrict the inlet pressure to 25 psi. However, with this high LRA rated R22 unit, I can run 80 psi inlet pressure or more without stalling and my fill time is crazy fast now!

I could not be happier.

So, if you are looking at multiple compressors, research the LRA rating and get one with a high number, preferably over 20.

Matt