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Originally Posted by Joe Ross
He wants to know if he can manually turn the compressor on, or can the compressor only come on when the pressure sensor senses low pressure.
Based on my reading of the rules, my first inclination would be to say no based on <R54>. However, why would FIRST give you a second pressure sensor if it couldn't be used for making decisions about the compressor? You should ask in the FIRST Q/A.
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The pressure switch is made to turn on at any pressure below 90psi and off at 120psi. You still need to program it and i think that there is a way to code the switch to have a second state in which if a secondary switch (controlled by you) is on, the pump goes on and shuts off still @ 120psi.