Hussmann Ingersoll Rand User Manual page 221

If the differential oil pressure drops below the cutout pressure for more than 90 seconds, the
output contact opens and stops the compressor. The control may be manually reset after
approximately 3 minutes by pushing the reset button. The control's internal microprocessor also
integrates multiple time periods when low oil pressure is present, and may shut off the
compressor even if 90 continuous seconds has not elapsed.
Mechanical Design 7