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CONTROL HOSE PORT CALL OUTS
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FURNAS SWITCH DESCRIPTION
The Furnas switch is a N.C. electrical switch set to open at 150 PSI and set to close at 115 PSI.
The Furnas switch controls the N.O. regulator solenoid. If service air pressure is under 150 PSI,
the Furnas switch will not trip keeping the N.O. inlet valve open and the compressor making air. If
the service valve is closed or the tool using the air is off, service line pressure will rise over 150
PSI, this will trip the Furnas switch to open. The regulator solenoid will open and send air pres-
sure to the inlet valve to close With the inlet valve closed, the compressor will stop making air. If
the tool is turned on or the service valve is opened, the service line pressure will drop. When the
pressure falls to 115 PSI The Furnas switch will close energizing the N.O. regulator solenoid
closing off the air supply to the inlet valve, this will allow the inlet valve to open and the compres-
sor will start making air to meet the demand.
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