Troubleshooting - Graco BDS Instructions-Parts List Manual

Troubleshooting

The most common X-Purge system problems are covered below. For additional assistance, call Bebco
Industries, Inc. – Customer Service Department at (409) 935–5743. Please have the system project number
(located on green quality control tag attached to back of system mounting plate) available.
Problem or Fault
Enclosure pressure control valve will
not hold a "safe" 0.25 inch pressure.
Enclosure pressure indicator reading
is difficult to stabilize.
Enclosure Protection Vent "shuttles"
or "flutters"
Enclosure Pressure Indicator reads a
"safe" pressure but the Safe Pressure
LED is not illuminated.
Problems persist or the system does
not appear to be operating properly.
66 309279
X-Purge Option
Possible Cause
Leakage around gasketing, cover, seams,
piping and tubing connections, conduit
connections and electrical conduit seals
of the enclosure.
Insufficient enclosure leakage or opening
of the venturi orifice is crimped too small.
Excessive leakage from protected
enclosure.
Insufficient protective gas supply header
pressure.
Conduit seal between Electrical Power
Control Unit (EPCU) and protected
enclosure is not poured or is leaking
pressure back into the EPCU.
EPCU breather drain is clogged.
Safe Pressure Switch is out of calibration.
Persisting problems
Solution
Tighten enclosure latches: where
tightening is not feasible and gasketing
materials are not practical, holes or gaps
can be closed with silicone sealant
applied from inside the protected
enclosure.
Remove the orifice cut off the crimped
end and ream the tube, then recrimp and
reinstall the tube to note effect. As tube is
shortened, reamed, and recrimped,
sensitivity decreases, allowing easier
adjustment of setpoint on the enclosure.
Check all points above and verify a
minimum 60 psi injection pressure
reading on the Rapid Exchange Pressure
Indicator during Rapid Exchange.
With a 0.0–5 inch water column test
gauge installed properly (see page 64)
slowly increase the Rapid Exchange
Injection pressure with the Rapid
Exchange valve engaged until this effect
is eliminated. Do not exceed 3 inches of
pressure within the protected enclosure.
With the area positively known to be
non-hazardous, remove the screw cover
of the EPCU and attempt a complete
startup procedure. If the system works
properly, check enclosure power conduit
seal for leakage and the EPCU breather
drain for blockage. If the system does not
operate properly, calibrate the Safe
Pressure Switch.
Do not attempt to calibrate the
NOTE:
switch until all efforts to make the switch
respond properly have failed.
Calibrate switch by slowly adjusting
counterclockwise to decrease the setpoint
and clockwise to raise the setpoint.
One year warranty on X-Purge system.
Contact Bebco Industries, Inc., Enclosure
Protection Systems Division at
(409) 953–5743.