Domino A-SERIES, Operation And Maintenance Manual

Page: 296 / 337

APPENDIX B : COMPRESSOR DRIVEN AIRDRYER
20950 Issue 1 April 98 B--37
(12) Insert the allen key into the locking screw, and turn clockwise to
lock.
Note: If the pressure adjusts, and the locking screw does not seem to lock,
remove the locking screw completely and refit the other way round.
If this is necessary, repeat steps 10 to 12).
(13) The PRV is now set. To release the pressure from the system, turn
the needle valve anti--clockwise by one turn.
(14) Switch the mains isolator OFF, and set switch SW1 to NORMAL.
(15) Apply Loctite activator to the end of the PRV thread , leave for 10
minutes, then apply Loctite 542 to the thread and refit the elbow to
within 1 to 2 turns of the end of the thread.
(16) Reconnect the nut to the elbow and cable tie the PRV back in place.
(17) Reset the airdryer’s pressure and airflow as detailed in the airdryer
test lit.
Needle Valve Refurbishment and Adjustment
WARNING: The airdryer must be switched off and power
removed.
The door must be open.
Test equipment to measure air flow and humidity will be required. See
Pg. B--44 for details.
(1) Unscrew the needle and withdraw from the valve body.
(2) Check needle is clean. Clean and check the ’O’ring -- replace if
necessary.
(3) Refit the needle into the valve body.
(4) Screw the needle into the valve until the valve is closed. Do not
over--tighten the needle.
(5) Consult the air flow meter chart and determine the meter
graduations corresponding to air flows of 2.0 and 2.2
litres/minute.
(6) Connect the air flowmeter to the air tube in the print head. Support
the flow meter in a vertical position.
(7) Carefully unscrew the needle and set the air flow indicated by the
meter to between 2.0 and 2.2 litres/minute. Remove the meter.
Note: Any instability in the ink jet should be properly investigated. If the
air flow rate from the dryer does interfere with the ink jet, reduce
the air flow (screw in the needle) until the interference ceases.