Air Products GASGUARD TE10, Installation, Operation And Maintenance Manual

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Section 8: Operating Procedures
Revision – September 2009 8 - 9
NOTE: The GASGUARD TE10 system is supplied with an internal
controller purging means that meets NFPA 496, Type Z purging
requirements for use in NEC Class I, Division II hazardous
location (applicable only in the U.S.A.) The internal Z-purge also
meets the requirements of the Explosive Atmospheres Directive
(ATEX)(applicable in the European Community). Type Z purge
does not meet Class I, Division I NEC requirements.
6. Press to initialize the controller on power up. No alarms should be
present. If alarms are present, do not continue. Follow the troubleshooting
procedures found in Section 9. If needed, contact your Air Products factory
representative for assistance.
7. Check that all automatic
valves indicate closed
position (green or dark
gray). They should
appear as illustrated to
the right.
8. Begin by closing the
regulators (knob rotated
fully counter clockwise).
Adjust each regulator
clockwise 6 turns. This
will ensure an adequate
purge pressure
downstream of the regulators when purging is initiated in step 14.
9. Check that the purge source is connected and delivering 80-90 psig of purge
gas (PT4).
Process gas back-stream hazard can exist if
the purge cylinder pressure drops below 200
psig.
10. Ensure MV4-1, purge gas inlet valve, is open.