Question about Air Tools & Compressors
How do i bypass the pressure switch and hook it up direct.
By direct, you most likely mean continuous run where the compressor runs to set pressure then a spill valve or unloader will discharge the rest of the air. This can be done with a pilot valve available thru WWW.Grainger.com or ebay. Make sure that the thread sizes will work on your compressor. You do not have to remove the pressure switch, however the unloader must unload before the pressure switch setting. For an idea on plumbing, take a look at gas powered compressors or an electric RolAir compressor that has that feature installed. Good luck.
Posted on Oct 25, 2012
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Posted on Jan 02, 2017
bad pressure switch or it is wired incorrectly replace switch and check the wiring or could be out of adjustment you compressor is made for max 125psi should be a screw to adjust on the pressure switch near where the wires are connected back out counter clockwise to lower and see if that turns it off
Posted on Feb 26, 2009
hi your problem sounds like the non return valve is either missing or is passing back pressure
the nrv should be on the hose that supplies the tank
Posted on Mar 24, 2009
STOP! Your pressure switch is doing what it is supposed to, but the tank check valve is leaking. This valve is usually at the tank where the line from the compressor head enters the tank. The small tube line from the pressure switch probably also goes to this valve. You'll need to clean or replace it.
Posted on Nov 17, 2009
take the power surply cover off and look down the side on the butten at the contacts, id say it isnot the pressur switch itself, and make sure all bolts are tight and check the reeds
Posted on Jul 30, 2010
This switch is only rated for up to 2 HP at 240 volts and 1-1/2 HP at 120 volts. Using 3 phase power, you can go only up to 3 HP. That would not cause the problem that you discuss, but it is an unsafe condition.
Some Square D switches have a small relief valve so that when the compressor reaches pressure, the motor stops and the relief opens and lets pressure out of the compressor cylinder. Does your switch have that and might that be what is "leaking"? I believe that if the compressor is tight that the leak would stop rather quickly.
Posted on Dec 11, 2010
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