Rapid Exchanger Purging Operation - Graco BDS Instructions-Parts List Manual

Rapid Exchanger Purging
Operation
WARNING
FIRE AND EXPLOSION HAZARD
Do not exceed a "safe" pressure with the
Enclosure Pressure Control Valve.
Operators must follow step-by-step the
sequence on the Startup Instructions
Nameplate on the X-Purge system. Do
not use the bypass modes without first
securing a "Hot Work" permit. Never leave the
system unattended in bypass modes.
With the inert gas supply on, the Rapid Exchange
Timer set properly, and the Electrical Power Control
Unit power and alarm system energized (if used),
follow the steps below to complete a startup cycle.
1. Carefully read the Startup Instruction Nameplate
on the system.
2. Check the operation of the Enclosure Protection
Vent, opening it manually several times. See
Important Notes, page 63.
3. Seal the protected enclosure(s).
4. Depress the On-Off Push Button (normal running
and power latching modes) or turn the Selector
Switch to the On position (conditional bypass and
unconditional bypass modes). Each LED should
illuminate fully for two seconds as a self test, then
all LEDs should turn off except Power Off (solid
red) and Alarm Active (flashing red) LEDs.
X-Purge Option
5. Turn the Enclosure Pressure Control Valve slowly
6. Place your left hand on the system mounting plate
NOTE: If the Safe Pressure or Timer Running LEDs
blink on and off or "flicker" during this cycle, the Electri-
cal Power Control Unit will reset the Rapid Exchange
Timer.
7. Standby until the Electrical Power Control Unit
8. After completion of the Rapid Exchange Timer
9. Ensure the Protection System Enclosure Pressure
10. If "Safe" 0.25 inch pressure is lost, the Electrical
counterclockwise to set the Enclosure Pressure
Indicator to a "safe" 0.25 inch pressure. The Safe
Pressure LED should be on, the Alarm Active LED
should turn off.
and pull the Rapid Exchange Manual Operator
firmly with your right hand, until the solenoid
latches (to hold the valve open automatically) then
quickly ensure the Enclosure Protection Vent
opens. The Rapid Exchange and Timer Active
LEDs should turn on.
Rapid Exchange Timer completes the timing cycle
and energizes enclosure power. The Safe Pres-
sure LED should stay on, Timer Running LED
should turn off and the Power On LED should turn
on.
timing cycle, the Timer Running LED should turn
off and the Power On LED should turn on. At the
same time, the Rapid Exchange Solenoid Valve
should de-energize and the Rapid Exchange LED
should turn off.
Indicator maintains a "safe" 0.25 inch pressure for
one minute. Readjust the Enclosure Pressure
Control Valve if required.
Power Control Unit will de-energize the enclosure
power and activate the alarm system (if used).
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