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3.5. Operating the System
Set up the system according to the preceding instructions.
1.
For Flush Programs 1 through 4 (hazardous gas environments), purging is required.
2.
a. Seal the pressurized enclosure.
b. Set enclosure pressure to a value above P1.
c. When using the 5500-MAN... manifold, the manifold valve is connected to the SV1
output. When the enclosure pressure is greater than P1, SV1 energizes the solenoid
valve for purging. When using the 7500-MAN... or other manual valves, initiate the
purging valve.
d. Adjust the regulated pressure so that enclosure pressure is above P3 (purging starts).
e. For the 5500-MAN manifold, after purging, the needle valve can be re-adjusted to the
user's preference, but it must be above the P1 value.
3.
For Flush Program 5 (hazardous dust environment), purging is not required.
a. The inside of the enclosure must be cleaned of all combustible dust.
b. The enclosure is sealed.
c. Adjust the enclosure pressure above P1.
4.
If enclosure pressure is above P1, power to the enclosure will be energized.
5.
If enclosure pressure drops below P1, power must be disconnected. If power is to remain on, an
alarm must be initiated and located near an operator.
6.
To energize the pressurized enclosure again, repeat the above sequence.
DAnGer!
All 7500 pressurization systems require EPV-7500...vents for pressure relief.
DAnGer!
When accessing the user-interface display, the area must be free of hazardous gas
and/or combustible dust. The lid to the 7500 housing must be attached and properly
tightened for operation in a hazardous area.
DAnGer!
Explosion hazard—do not open when an explosive atmosphere is present.
Substitution of components may impair suitability for use in hazardous (classified)
areas.
AVerTISSeMenT!
Risque d'explosion—ne pas ouvrir lorsqu'une atmosphère explosive est présent.
La substitution de composants peut rendre ce materiel inacceptable pour les de
utilisation dans des Zones (Classifiées) dangereuses.
Note
At ambient temperatures below -20 °C, the display of the 7500 control unit may not be
visible. However, the unit and LED indicators will still function properly.
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