Installation Guide and Manual

56
System Maintenance
Regular Maintenance
Drain the Protection System Filter (if utilized) frequently and clean system with non-solvent cleaning agents only.
Long Term Maintenance
Calibrate the enclosure pressure indicator to 0 inches by venting the purge pressure reference port and the protected
enclosure to atmosphere and adjusting the calibration screw in the lower center portion of the indicator’s face.
Fully open the enclosure pressure control valve, to blow out any deposits around the tip of the valve and to ensure that
the enclosure protection vent is operating properly, then carefully readjust system according to the set-up procedure
and operating sequence on pages 50. Replace or tighten stem packing nut as required to prohibit stem packing leakage.
Carefully disassemble the enclosure protection vent by loosening the two bottom hex nuts that hold the unit together.
(DO NOT REMOVE CAP NUTS ON TOP OF VENT BODY)
Carefully clean the flapper valve and vent body seats with warm soap and water, being careful not to extend the vent
valve beyond its normal opening point, and being careful not to exert any stress on the valve hinge.
Examine the entire Protection System and the protected enclosure(s), and replace any defective parts curing routine
shutdown of the protected enclosure(s). Parts are available from Pepperl+Fuchs on immediate notice as required.
Maintenance Schedule
Date
Work Performed
Performed By