Air Products GASGUARD TE10, Инструкция по установке, эксплуатации и обслуживанию, Страница: 132 / 196

GASGUARD
®
TE10 Distribution System Manual
Air Products and Chemicals, Inc. 8 - 8
8.3 New System Startup Procedure
In NEC Class I, Division II hazardous
locations (applies only in the U.S.A.) or
Explosive Atmospheres (applies only in the
European Community), do not apply power
to the Distribution System controller until
the controller enclosure has been purged for
at least 20 minutes at a pressure at or above
0.1" H2O as monitored by the internal Z
purge pressure switch (hazardous locations
only). Refer to steps 3 and 4 below. This
complies with NFPA 496 and ATEX
regulations regarding electrical equipment
enclosures. Failure to do so could result in
the ignition of any flammable gas which
may be present.
1. Verify that the system is ready for startup by completing the startup checklist
in the installation manual. Check that the GASGUARD Distribution System
and all plant piping have been leak checked with a helium mass spectrometer
in accordance with the customer's specified procedure. Check that the
GASGUARD Distribution System has been functionally checked after
installation.
2. Check that the Distribution System exhaust system and hazardous gas
disposal system (pollution abatement) are operating.
3. Verify that house nitrogen pressure is between 85-95 psig (5.9-6.6 barg).
4. To initiate Z-purge, open the gas flow needle valve one to two turns counter
clockwise from fully closed position. A Z-purge of the controller may not be
required in certain areas.
5. After purging the controller for at least 20 minutes, turn on electrical power to
the controller.
NOTE: The controller is equipped with a Z-purge pressure switch.
The absence of this alarm during Z-purging indicates that the Z-
purge is adequate. If a "Low Z-purge" alarm is present after
power up, increase the flow rate until the alarm can be .