Ametek Thermox 2000 ATEX Series User Manual page 38

3-14 | Thermox Series 2000 WDG-HPII / HPIIC - ATEX
Do not exceed "Safe" pressure with the Enclosure Pressure Control
!
Valve.
WARNING
Operators must follow-step-by-step sequence of the Start-Up
instructions Nameplate on the Protection System.
With the protective gas supply connected, enclosure power deenergized
and alarm system energized (if utilized).
1. Carefully read Start-Up Instruction on system.
2. Check operation of the Enclosure Protection Vent.
3. Seal protected enclosure(s).
4. Unlock T-bar Valve Key from the RECV stem and place in the EPCV
stem, open Enclosure Pressure Control Valve, by turning CCW
(counter-clockwise), to set Enclosure Pressure Gauge at "Safe" pres-
sure, the Pressure Loss Alarm Switch (if utilized) should then activate
to silence the alarm system.
5. Carefully remove T-bar Valve Key from Enclosure Pressure Control
Valve stem. Ensure Enclosure Pressure Gauge "Safe" pressure setting
is stable.
6. Utilizing the T-bar Valve Key supplied with system, open Rapid Ex-
change control Valve fully by turning 90° CCW and quickly ensure the
Enclosure Protection Vent opens. Note: The Enclosure Pressure Gauge
should move quickly off scale to the right, this is normal for all Rapid
Exchange purging systems.
7. Standby for the exchange time (five minutes minimum), then close the
Rapid Exchange Control Valve fully and ensure T-bar Valve Key is firmly
locked in Rapid Exchange Control Valve stem.
8. Wait for the Enclosure Pressure Gauge to return to a "Safe" pressure
and energize the protected enclosures) power via the local disconnect
switch.
9. Ensure the Enclosure Pressure Indicator maintains a "Safe" pressure
before leaving system unattended.