Air Products Gasguard 250, Installation Manual

Page: 46 / 68

Gasguard
®
250 VMB System Installation Manual
Air Products and Chemicals, Inc. Page 5 - 2
To operate these valves, the pneumatic supply hookup (Section 3.6 of this manual)
and the electrical power connection (Section 4.2 of this manual) installation must
be completed.
How to Perform Helium Leak Checking in Manual Mode
Operating in Manual Mode can cause the
following hazards which can result in
PERSONAL INJURY OR DEATH.
•
Process gas could be forced into the
purge panel and/or purge gas cylinder.
•
Opening purge panel valves when high
pressure process gas is present.
•
High pressure process gas could be
unintentionally vented.
•
Opening vent valves when high
pressure process gas is present.
No process gas cylinders should be connected
to the upstream supply source for the VMB at
this time. If one is or was connected, do not
continue, as personal injury or death can
result. Contact an Air Products and
Chemicals representative for system
verification.
NOTE: Due to the potential hazards listed above, Manual Mode
operation requires a second or higher level security code. See
Section 3 in the Operation and Maintenance Manual for more
details on the password security system.
NOTE: Prior to shipment, the valve manifold box panel has been
certified to strict cleanliness specifications. Improper operation of
the valves in "Manual Mode" could result in contamination of the
gas panel.
NOTE: A pneumatic supply connected to the controller with 75-95
psig of nitrogen needs to be available to actuate the valves.