the compressor runs until the relief pops on the unit.

My work compressor runs until it pops the relief valve on the unit. How do you adjust the pressure switch? there are 2 springs with a nut on each, 1 tall, 1 short, which is which?


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Bill says....

Regardless of which is high pressure cut out and which is low pressure cut in the issue is, unless you modified one of them, your compressor should cut out at the normal pressure level.

If it is not doing that, and power continues to run to the motor when the pressure gets past the normal cut out pressure setting (which means that the pressure switch has not tripped off the power) then you need to replace the pressure switch, not adjust the cut out levels.

Cheers,

Bill

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compressor does not cut out on set point

by Jacob Nyoka
(Africa Botswana)

trying to adjust pressure on a Zseries compressors model 225A

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Bill says....

Hello Jacob.

How come you are trying to adjust the cut in and/or cut out pressure setting on your air compressor?

If the pressure switch that came with it is factory, then it's set properly for your air compressor.

If you are trying to boost the cut out (high pressure) setting to get more air out of it, I think you will have a problem with that.

If it just that the compressor keeps running past the high pressure cut out point, and runs until the PRV lets go, then, my friend, you need a new pressure switch.

Cheers,

Bill

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Pressure Switch

by Pfunk
(Harrisburg, Pa)


This morning I notice that below the pressure switch there was a small air leak. There is a small tube from the compressor to the switch. The leak is at the connection point where the tube is connected to the pressure switch. There is an adaptor that has a manufactured hole in it. I can easily plug the hole up with my finger but it bleeds somewhere else on the adptor piece. Could i just replace it?

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Bill says...

Pfunk, while the leak is at the unloader valve, I suspect first that it's your check valve that may not be seating properly.

When the compressor is stopped, the path from the pump to the tank, and from the tank to the unloader valve is open to atmosphere, to allow the air to bleed off from over the piston.

The only thing that keeps the compressed air in the tank is the check valve, normally located whee the line from the pump and to the pressure switch connect at the tank.

If the check valve doesn't seat properly, air will bleed out continuously.

Cheers,

Bill

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