Since were talking about compressors I have an old one that the neibor gave me when he moved I had to rewire the cord and replace the hose but heres my question what could be the cause of the compressor not shutting off and at what setting do they normally shut off?I tried to google info about compressors but I must be asking the wrong way becuase I can't find any info.
The compressor should have a pressure sensitive shut off switch which often has a screw adjustment which lets you set the on and off pressure levels.
You can normally identify the switch unit because it will be a unit that has both an air supply from the tank and an electrical supply, usually direct from the mains.
The switch has two settings the on level is the pressure at which the compressor turns on and the off level is the pressure at which it turns off, typically these could be set at 105 psi for the on level and 115 psi for the off level.
The settings for these levels really depends on the operating profile you want from the compressor, having a wide difference between on and off levels will cause the compressor to turn on less often, but when it does it will be for longer periods of time, and before it does you could have a large pressure drop (not a problem if you only use lower pressures) and a narrow band will mean the compressor turns on frequently for short bursts, and you will maintain a higher mean pressure.
If you are finding that during use the compressor is constantly on then its either too small for the job or you have a faulty switch.