Possible problems
It takes too much time before the vent valve closes (the vent valve closes after a few minutes or in extreme
conditions the vent valve does not close at all). This can occur when the unit is connected to an empty vessel
or whenever there is no backpressure.
Solution
Adjust the vent valve by using a precision shim of 0.5 mm (0.02 in) thickness. The stroke of the vent valve
piston may not be larger than 0.5 mm. Check the stroke of the vent valve piston by pulling the shaft with the
two nuts away from the vent valve housing and use the precision shim to measure the distance between the
nuts and the vent valve housing.
If this distance is larger than 0.5 mm, tighten the nuts until the distance becomes 0.5 mm. This will result in
a venting time of 5 to 25 seconds in case of a unit connected to an empty vessel. The smaller the piston stroke,
the smaller the venting flow and venting time.
If the stroke of 0.5 mm is too much for the application, the stroke can be decreased further by tightening the
nuts more until a satisfied venting time is reached. When the stroke is set to less than 0.5 mm, check that the
vent valve still vents enough for the motor to start in under minimal voltage conditions on a pressurized vessel.
Instruction book
2920 7002 03
37
Summary of Contents for 8115410428
Page 1: ...Atlas Copco Oil free air piston compressors LFx 0 7 LFx 1 0 LFx 1 5 LFx 2 0 Instruction book ...
Page 2: ......
Page 18: ...Dimension drawing LFx Complete unit on air receiver Instruction book 16 2920 7002 03 ...
Page 23: ...3 3 Electrical connections Electrical diagrams Single phase Instruction book 2920 7002 03 21 ...
Page 24: ...3 phase 230 V 50 Hz and 230 V 60 Hz Instruction book 22 2920 7002 03 ...
Page 25: ...3 phase 400 V 50 Hz and 440 460 V 60 Hz Instruction book 2920 7002 03 23 ...
Page 26: ...Single phase with CDXF air dryer Instruction book 24 2920 7002 03 ...
Page 27: ...3 phase 230 V 50 Hz and 230 V 60 Hz with CDXF air dryer Instruction book 2920 7002 03 25 ...
Page 28: ...3 phase 400 V 50 Hz and 440 460 V 60 Hz with CDXF air dryer Instruction book 26 2920 7002 03 ...
Page 29: ...Single phase with electronic drain or purge solenoid Instruction book 2920 7002 03 27 ...
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Page 49: ......