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RA250E20 User Manual?

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I finally found a 20 gallon horizontal tank for this compressor head for $50. Between that and the fittings, it cost around $100 bux to get this thing running again. So I “broke even” so far.

Only thing is, it won’t shut off at 100 psi. I forget how to adjust the mechanical relay to get it to shut-off when I want.

Also, the original relay pedestal was mounted directly to the tank with a 1 1/2″ pipe thread opening.

But this one I connected to a reducer street elbow and then 1/2″ copper tubing going into the side of the new tank where the connection is.

So I wonder if that reduction is causing the relay to not shut-off at 100 psi. I don’t ever run my compressors over 100 psi, and usually run them at 90 psi.

Anybody have a User Manual for this DeVilbiss compression head? The Relay is Square-D.

Thanx … Chris


RA250E20 Setting Pressure Relay
by: Anonymous


I found how to set the relay here:


It’s pretty simple.

But I still want to get a User Manual if one exists. Anyone?

Thanx … Chris

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By Bill Wade

About Air Compressors has been helping folks with their Air Compressor Problems since 2002 online. We're a community of DIY and Compressed Air professionals who are keen to support everyone across the globe with their air compressor issues and troubleshooting. Whether you're trying to identify an old air compressor, or troubleshoot an error code on a sophisticated new industrial air compressor - the community at About-Air-Compressors.com is here to help you

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