Quincy Compressor 50093-103 - Manual (Page 48)

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Stopping the Vacuum Pump - Normal Operation
All that is normally necessary for stopping the vacuum
pump is to push the “stop” button. It is advisable to
install a manual shutoff ahead of the inlet valve and close
it prior to turning the vacuum pump off. If for any reason
the inlet valve did not close tightly, the manual shutoff
valve would prevent fluid from being sucked back into the
vacuum system.
Stopping the Vacuum Pump - Emergency
Push the stop button or turn the power off at the main
disconnect switch or panel.