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

Rapid Exchanger Purging
Setup
1. Fully close the Enclosure Pressure Control Valve
by turning the valve clockwise.
2. Connect the inert gas supply to the system supply
inlet and set the Rapid Exchange Pressure Gauge
to 60 psi.
3. Temporarily connect a 0–5 inch water column
pressure gauge or manometer to the protected
enclosure.
4. Check operation of the Enclosure Protection Vent
as detailed in Important Notes, page 63.
5. Seal enclosure(s) and adjust the Enclosure Pres-
sure Control Valve by turning the valve slowly
counterclockwise to set a safe pressure on the
Enclosure Pressure Gauge.
NOTE: If the pressure setting is difficult to stabilize or
set, see Troubleshooting on page 66.
6. With the aid of an assistant with two 1/2 inch
combination wrenches, place your left hand on the
system mounting plate and pull the Rapid Ex-
change Manual Operator firmly with the right hand
and quickly ensure the Enclosure Protection Vent
opens. If the Enclosure Protection Vent operates
properly, have the other person carefully place the
open end of both wrenches behind the handle to
hold the Manual Operator in the out position tem-
porarily.
NOTE: The Enclosure Pressure Gauge should move
quickly off scale to the right, this is normal for all Rapid
Exchange purging systems.
7. Readjust the regulator to 60 psi minimum, while
inducing Rapid Exchange, the test gauge should
then read approximately 2 inches of pressure and
should not fluctuate. Insufficient enclosure pres-
sure will cause the Enclosure Protection Vent to
"shuttle". Do not exceed 5 inches of pressure
within the protected enclosure.
8. Close the Enclosure Pressure Control Valve or
remove the two 1/2 inch combination wrenches
from behind the handle.
64 309279
X-Purge Option
NOTE: The Rapid Exchange Pressure Gauge may
now indicate a higher set pressure than was originally
set, this is normal for all Rapid Exchange purging
systems.
9. Set the Rapid Exchange Timer for the required
10. Install and tighten the cover of the Electrical Power
11. Depress the On-Off Push Button in normal running
12. Turn the Enclosure Pressure Control Valve slowly
13. Place your left hand on the system mounting plate
14. After ensuring that the Safe Pressure and Timer
15. Follow the Purging Operation procedure on page
exchange time, based on the system exchange
rate of one minute per cubic foot, five minutes
minimum. Refer to the timer settings on page 62.
Control Unit. Ensure that the conduit is sealed with
approved compounds.
mode or power latching mode or turn the Power
Selector Switch to the On position in conditional
bypass mode or unconditional bypass mode. Each
LED should illuminate fully for two seconds (self
test), then all LEDs should turn off except the
Power Off (solid red) and Alarm Active (flashing
red) LEDs.
clockwise to set the Enclosure Pressure Indicator
to 0.25 inch pressure. The Safe Pressure LED
should be on, the Alarm Active LED should turn off.
Check for a 0.10 to 0.15 inch trip point by slowly
stroking the indicator from 0.10 to 0.25 inch read-
ings. The Safe Pressure and Alarm Active LEDs
should turn on and off when the indicator reads
between 0.10 and 0.15 inches.
and pull the Rapid Exchange Manual Operator
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 be on. Check for the trip
point by turning the Electrical Power Control Unit
Power Switch off and on (to reset unit). The Rapid
Exchange and Timer Running LEDs should not
turn on until the valve is more than half open. Allow
the system to run through the Rapid Exchange
timer cycle and watch for the solenoid to disen-
gage. The valve should be able to shut off without
disturbing the status of the Safe Pressure LED.
Running LEDs are functioning properly, you are
done testing. Remove the test equipment.
65 to complete a full startup cycle and ensure that
the system functions normally during all phases of
operation.