SANDPIPER RHDB2 Hazardous Duty - Manual (Page 31)

rhdb2dl1sm_haz duty-rev0614 Model RHDB2 Hazardous Duty Page 29
AirVantage Servicing - Poppet Valve
Step #1: Remove the Patch Cable
• Twist the ribbed portion of the patch cable connector in a counterclockwise direction, until it
unthreads from the connector. The cable can either be removed from the intermediate or from the
control module.
Step #2: Remove the AirVantage from the Pump
• Use a ½” socket and remove the four 5/16-18 x 5 ½ cap screws that hold the AirVantage to the
pump. Be sure to support the weight of the AirVantage while removing the last cap screw. After the
AirVantage is removed from the pump, set the unit down on the bottom cover. Inspect the o-ring
between the poppet valve and the adapter plate for damage.
Step #3: Access the Solenoid Valve and Pressure Regulator
• Use a 5/32 hex-key wrench and loosen the four 10-32 x .50 socket head cap screws securing
the top cover on. Lift the cover off, exposing the solenoid valve and pressure regulator. There is a
molded o-ring seal located on the underside of the cap. Make sure the o-ring stays located within the
groove.
• Unplug the connector attached to it. Use a miniature 4-way Phillips screwdriver and remove the two
screws securing the solenoid valve to the plate. The valve and gasket can now be removed and/or
replaced.
• Use slip-joint pliers to unscrew the regulator from the body by turning it in a counterclockwise
direction.
• “AirVantage CAUTION” – Do not loosen or tighten the regulator by turning the knurled
portion of the unit. Place the slip-joint pliers on the smooth area underneath the knurled area
of the regulator. Reinstall the top cover and loosely reinstall the bolts.
Step #4: Access the Power Generation Module
• Turn the assembly over and let it now rest on the top cover.
• Use a 5/32 hex-key wrench and remove the four 10-32 x .50 socket head cap screws securing the
bottom cover on. Lift the bottom cover off, exposing the power generation module. There is a molded
o-ring seal located on the underside of the cap. Make sure the o-ring stays located within the groove.
• Unplug the connector that connects the power generator to the control board. Use a 5/32 hex-key
wrench to loosen the four 10-32 x 2 ¼ socket head cap screws. The power generation module
should now be loose. Carefully lift the power generation module off the rest of the assembly, making
sure that the control board wire and connector slips through the hole in the power generation case.
Step #5: Access the Control Module
• Use a 5/32 hex-key wrench and loosen the two 10-32 x 1.00 socket head cap screws securing the
control module to the poppet assembly. The control module should now be loose. Carefully lift the
control module off the poppet assembly, making sure that the solenoid valve connector wire slips
through the hole in the poppet valve assembly.
• The Poppet valve assembly can now be replaced.
Step #6: Reinstallation
• Install the control module on the poppet valve assembly. Make sure to feed the solenoid valve connector
wire through the hole in the poppet valve assembly. Install the two 10-32 x 1.00 socket head cap screws
and tighten to 30 in-lbs.
• Install the power generation module onto the control module. Make sure to feed the control module wire
through the hole in the power generation case. Install the four 10-32 x 2 ¼ socket head cap screws and
tighten to 60 in-lbs.
• “AirVantage CAUTION” – Be sure to reattach the connector from the power generator to the
control board.
• Install the bottom cover, making sure the o-ring seal is still in the groove. Tighten the four 10-32 screws.
The unit can now be turned over and set on the bottom cover.
• Install the solenoid valve, tighten the screws snug with a miniature 4-way Phillips screwdriver.
• “AirVantage CAUTION” – Be sure to reattach the connector to the solenoid valve.
• “AirVantage CAUTION” – Be sure to reattach the patch cable connector that connects the
AirVantage module to the intermediate.
• If the pressure regulator needs to be replaced, use slip-joint pliers to unscrew the regulator from the body
by turning it in a counterclockwise direction.
• “AirVantage CAUTION” – Do not loosen or tighten the regulator by turning the knurled portion
of the unit. Place the slip-joint pliers on the smooth area underneath the knurled area of the
regulator.
Step #7: Reinstallation
• Reinstall the top cover, making sure the o-ring seal is still in the groove. Tighten the four 10-32 screws.
• Reinstall the AirVantage using the four 5/16-18 x 5 ½ cap screws and torque to 90 in-lbs.
• “AirVantage CAUTION” – Be sure to reattach the patch cable connector that connects the
AirVantage module to the intermediate.
• Refer to Page 28 for Illustration
Note: Ensure all mating faces are free from scores or damage prior to re-assembly.
Check each metallic face joint with a 0.003” feeler gage to ensure all flange
faces are fully closed after assembly. Failure to do so may compromise the
flameproof design of the assembly.
Substitution of
components may
impair intrinsic safety.
WARNING
Do not open when an
explosive atmosphere
may be present.
WARNING