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 thepressure adjusts,and thelockingscrewdoes notseemtolock,
removethelockingscrewcompletelyandrefittheotherwayround.
If this is necessary, repeat steps 10 to 12).
(13)The PRV is now set. To release thepressure fromthe 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 applyLoctite542tothethreadandrefittheelbowto
within 1 to 2 turns of the end of the thread.
(16)Reconnect thenuttotheelbowandcable tiethe PRVback inplace.
(17)Resettheairdryer’spressureandairflowasdetailedintheairdryer
test lit.
Needle Valve Refurbishment and Adjustment
WARNING: The airdryer must be switched off and power
removed.
The door must be open.
Testequipmenttomeasureairflowandhumiditywillberequired. 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) Connecttheairflowmetertotheairtubeintheprinthead. Support
the flow meter in a vertical position.
(7) Carefully unscrewtheneedleand set the air flow indicated by the
meter to between 2.0 and 2.2 litres/minute. Remove the meter.
Note: Anyinstabilityintheinkjetshouldbeproperlyinvestigated. Ifthe
air flow rate from the dryer does interfere with the ink jet, reduce
the air flow (screw in the needle) until the interference ceases.
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