Hey guys I need some help. My Compressor runs constantly and when it seems to be full it doesn’t stop, the valve just let’s the air out and it continues to run. I have replaced the pop off valve thinking it was going bad but now I know its not the problem. What should I do?
You say “seems to be full” what is your gauge reading?
When I say seems to be full because it shouldn’t let air out unless it was full? I mean right? I don’t have a gauge hooked up to it, never have. Never had this problem before. I have it hooked up to where my compressor will run ONLY while my key is on and it always has stopped when full until I either blow it or air leaks out. Now it just runs all the time so I took the fuse out so I won’t burn the compressor up until I figure the problem out.
Do you know if you have any leaks? If your compressor is constantly running… It would take a big leak to do that…one that would be easily noticeable.
Sound like to me the pressure switch is bad. Allowing the pump to continue to run till the blow off valve releases and closes back off. And continues the process over and over again. But I could be wrong but I’d check your pressure switch.
I don’t think any “big” leaks just minor. At least not one that is bad enough to allow that to happen. I did think about the pressure switch being bad but wouldn’t that not allow me to blow the horn?
If there’s air in the tank & your solenoid valve works - then the horn should blow.
That’s seperate from the pressure switch.
Since you’re popping the safety valve (and even replaced it) you know there’s too much pressure…so it not a leak.
Since the compressor shuts off when you turn the key off - you know it’s not a stuck relay.
IMO it’s the pressure switch.
I agree with ear2ear. Thats is why I asked about the PSI. My next step would be to test the switch. What switch do you have?
It’s the 40A Viair-165-200 switch with relay. Would you recommend just to buy a new switch? Because I’m not to sure how to just test it?
[LEFT][FONT=Calibri]I’m not real f[FONT=Calibri]amiliar with viair’s switches but this is how you can test it. First I would recommend getting a gauge so you can monitor your tanks PSI. If not, let your compressor run to the point that you think it should shut down. Shut the power down to the compressors including your switch. You will need to be able to get to the terminal connections on the switch and be able to disconnect the two wires that are attached to it. Using a ohm meter contact the red lead to one terminal and the black to the other. With pressure on the switch it should be closed and the meter should read 0 [SIZE=2]indicating the air pressure switch is good. If the switch does not close, the ohm meter will read infinity or “OL” for open. Or yes you could buy a new switch. Good luck…[/FONT][/SIZE][/FONT][/LEFT]
Yeah man I think I’m going to buy another one, not really a big deal. But I have a question, do I still have to use the same pressure switch or can I buy a more updated one such as Premium Hornblasters pressure switch 165-200, or do I have to stick with the 40A one I have now?
You can buy which ever one you want - just get the same shutoff pressure - dual or single unit…
You might just give em a call - if you’re going to buy one anyway.
You can use hornblasters. They can send you whatever you want. I have dual viair 90111 switches and I’m going to get the hornblasters dual relay with single switch for my dual 480c’s.
i dont think its the switch… if everything is wired how its supposed to be and the pressure switch went dead, then your compressors would not turn on at all…
you one def. need a gauge on your tank…
and if your compressor never shut off then there is a leak somewhere… but how long do u allow them to run??
you should buy a gauge and check test it out… that can solve the problem most likely… and def. listen to hissin noises for leaks…
otherwise i think its either ur tank is empty and ur not allowin it enough time to shut off compressors… or u have a leak… but i dont think its the switch just yet…
But he’s blowing his safety valve - even replaced it.
whats his safety valve set to blow at?? his entire system could be messed up…
Yeah, a gauge takes out any doubt.
I agree, you can’t trust a pressure switch to work correctly all the time.
You probably already know this, but just in case: Many of the HB pressure switches have internal relays, so you would remove the old relay too when changing switches.
I agree that if there is a leak the compressor would cycle more, however not continuously run. Not to mention the safety valve is popping off. That would take a massive leak in this scenario. As far as the switch, it is normally closed. It could go bad open or closed. In this case I’m willing to bet if you put a ohm meter on the switch with presser in the tank it will show “infinity or OL” which means the switch is gone bad in the open mode.