Devilbiss PRFBC5525vp Blows breaker.

by Cary Honeywell
(Perth, Ontario, Canada)

I picked up a used Devilbiss PRFBC5525vp that likes to pop breakers. It starts up and runs for 2 seconds then crashes.


I replaced the capacitor in the motor hub (150 MF rather than the 135) and had the other capacitor checked at a shop. It was ok.

The motor turns by hand quite freely and even took the main outlet off to make sure there was air being pushed. What am I missing or is it that second capacitor?

_ Cary _
___________________
Hi there Cary...

I tried to find the specs and a photo of your Devilbiss PRFBC5525vp air compressor on line with no luck, so I'm kind of shooting in the dark here.

Often, but not always, the compressor symptoms you describe are related to power supply.

Good that you checked the caps and replaced one. See the page under troubleshooting for how to check the other one if you wish.

As a comment here, tell me about how you are getting power to your air compressor, and the amperage of the breaker your air compressor is plugged into.

Cheers,

Bill

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Aug 16, 2015
Compressor runs like an ape
by: Bill

You checked the capacitors?

By removing the line you removed the load from the pump, and it can run easily, and even with weak caps.

Or, check the tank check valve to see if it's blocked, first.

Aug 15, 2015
Devilbiss blows breaker
by: Anonymous

Hi Bill, I have the same problem as Cary. Your last post you said to remove the line from motor to tank. I did that and it ran like a raped ape. Can you diagnose this for me please?

Oct 15, 2014
Blows breaker
by: Anonymous

There is a check valve to hold the compressed air in the tank while the unloader valve drains the compressed air off the head of the pump. This happens each time the compressor shuts off. If the compressor is not draining off the compressed air from the pump it will try to start against a load and blow your breaker. Also if the check valve is leaking, you would be starting against the tank pressure and blow the breaker. Both are cheap parts to replace.

Jul 07, 2013
Power
by: Cary

My email told me that you posted a comment but I don't see anything new. Must be a mistake.

_Cary_
_______________
I just approved your comment Cary. I have nothing further to add as, when I review the thread, I don't know if you have done all of what was recommended earlier on.

B.

Jul 02, 2013
Power
by: Cary

Uh.. yeah. Sorry. I took the motor off and checked the plate. AO Smith model K56A75B23, 120 V, 15.0 A, 60 Hz, Single phase, 3450 rpm, CW.

It may be possible to just replace the motor but it would be a shame if I couldn't just fix it.

_Cary_

Jul 02, 2013
Power
by: Cary

The motor is 5 HP. My other 5 HP compressor needed 20 amps but had run well at 15. This one blows the 20 amp breaker.

I tried removing the tube and it didn't change the situation. There was air flow from the cylinder outlet so the head itself should be good.

_ Cary _
______________
I am not an electrician, but when I search for the recommended breaker for a 5 HP motor, I keep coming up with 40 amps.

B.

Jun 30, 2013
Power
by: Cary

Thanks Bill. Yes. I couldn't find a picture either. Everything else on the unit works with no leaks. Pressure on/off trips normally. (connected to another working air pump). The power is straight off the panel. I tried 15 amps first then 20. Same result. It doesn't look like it could be wired for 220 either but that shouldn't matter I think.

_ Cary _
__________________
A 20 amp is good for a few HP. What's the HP of your compressor?

Pull the line from the pump to the tank. Start the compressor. Still same problem?

Bill


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devilbiss 432 rotation

on a devilbiss 432 and facing the flywheel which is the correcy rotation

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Devilbiss DF5020 blows the circuit breaker?

by Ninos
(Gilbert, AZ, USA)

Devilbiss air compressor (photo: www.devap.com)

Devilbiss air compressor (photo: www.devap.com)

My air compressor tries to start but ends up blowing the breaker if there is air in the tank. I figured that under 40 - 50 psi it starts the same way as when there is more air but ends up getting full power and runs fine. With anything over 50 psi the motor tries to start and seems to run, but with real low power, but ends up giving up and blowing the circuit breaker. Its a 5 hp 20 gallon devilbiss model# DF5020 compressor. What could this be?
__________________
Ninos, the first thing that comes to mind is whether or not your unloader valve is doing its job.

Please empty the tank of air, close the drain, start the compressor (hoping it does) and let it run up to cut out pressure.

If it gets there, monitor the unloader valve to be sure it is working properly. If not, that is likely your Devilbiss air compressor problem.

If that doesn't seem to be the problem, please add a comment here.

Cheers,

Bill

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Oct 20, 2012
Response to Bill
by: Ninos

Bill, first, I'd like to say thank you for your response. I appreciate you taking the time to answer my questions.

I did what you asked: emptied the tank, closed the drain, started the air compressor. It reached its cut out pressure of 125 psi in a little under 2 minutes and after the motor shut off I heard a loud air release sound. The sound was quick and sort of startled me since I was so close to the unit.

The unloader valve does seem to be working properly, I believe.

I also read that it could be the check valve causing the issue, how would I be able to test that? Any other information would be much appreciated.
______________
Nino, the "I heard a loud air release sound" was likely your unloader valve opening and dumping the air over the piston. The unloader valve will stay open until such time as the compressor starts.

To test the check valve you need to unplug your compressor, empty all the air (again:-) and remove the line from the pump head to the tank. Where that line enters the tank is where the check valve usually resides.

A check valve is built so that air flows through it in one direction only. If you blow into the ports on the check valve, that's how you check and see if it's actually working. Yuck, I know, but that's how I do it.

It doesn't hurt to give it a good cleaning even if it seals up properly before reinstalling it.

B.

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Devilbiss compressor hums for about five seconds then trips breaker

by Jerry
(winterhaven fl united states)

Compressor info: Devilbiss Charge Pro Air 60 gal tank. General Electric Motor 5KCP49SN2021Y...MO-3022-1 208-240 volt 15 amp,non reversable, thermal protected.

Compressor History: 7 yrs old and was used 30 hours a week for three yrs.

Since then only about two hrs a week every week. Has worked perfect except, i had to replace pressure switch once about three yrs ago and motor rebuilt about the same time due to a bearing starting to make some noise.

Compressor has now sat untouched for the past year.

Problem: Upon restarting the compressor started right up. Built up pressure untill pressure switch cut it off at correct 135psi setting.

when the pressure drop for switch to cut back on it did but, hummed a few seconds and trip breaker.

Things i have tryed and looked at: Check for water in tank ( even tho i do have an automatic unloader installed) and tank was free of water.

Next i drained the tank of all air pressure and checked oil which was ok. Next with the switch on compressor set to off i fliped breaker that was red, off then on then off then on agin. breaker felt fine with no loose play, so i left it on. Went back to compressor, fliped switch from off to auto on compressor...Same thing, hummed for a few seconds and triped breaker. The motor it self has a reset button but was not being affected. At that point i turned switch on compressor back off,and reset breaker agin. Went back to compressor and removed belt.

Turned switch on and the motor started and ran perfect with no noise. I then turned the flywheel by hand and found no problem. I put belt back on and checked tightness and straightness,was ok then tryed restart..same thing, hummed for a few seconds and triped breaker. The only other thing i can think of is i did was replace the breaker with the same size as old. Same problem. The compressor is and always has been on its on dedicated circuit. Any help would be great. Thanks (hope i havent typed to much for you to read, i'm 70 yr old and do not type to good)Jerry...
__________________
Good typing, and good information to help me help you, Jerry.

What I think you have is a failed start capacitor. See the page on this site about how to check, and let us know as a comment here if that was the problem.

Cheers,

Bill

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Aug 23, 2013
Part number for the capacitor used to fix the problem.
by: Jesse

Hey I'm looking for the part number off the start capacitor on one of these compressors. Got my compressor for free and that's all that is missing.

Feb 24, 2013
Bill your sugestion has fixed compressor
by: Jerry

Hello...I posted this responce once already but i do not know if it got back to you. Anyway the start cap was the problem. It all looked ok but i replaced and all is well here. thanks agin. I had asked if i could contribute to this site. I have found where i can purchase a book that does just that. I will make the purchase to help keep tis great site going, thanks agin for your knowledge, jerry
______________
You are welcome.

Bill

Feb 24, 2013
right on the money bill
by: jerry

Hello and thanks for your knowledge. I removed start cap. and even tho all looked well, it was BAD. I replace it and all is well and compressor works with no problems. Many thanks....(is there a way to make a contribution to help keep your site going?)
_____________
Sure Jerry. See the home page and buy my book.

B.

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