Atlas Copco GA 11+ Instruction Book page 125

Instruction book
Condition
Low Load Alarm triggeredon VSD+
units: Compressor running with too
low oil temperature over a longer
period of time
Faults and remedies, dryer
For all references hereafter, consult section
Condition
Pressure dew point too high
Condenser pressure too high
or too low
Compressor stops or does not
start
Electronic condensate drain
remains inoperative
Condensate trap continuously
discharges air and water
Evaporator pressure is too
high or too low at unload
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Fault
Solenoid valve malfunctioning
Extreme low usage of compressor
Air dryer.
Fault
Air inlet temperature too high
Ambient temperature too high Check and correct; if necessary, draw
Shortage of refrigerant
Refrigerant compressor does
not run
Evaporator pressure too high
Condenser pressure too high
Fan control switch out of
order
Fan blades or fan motor out of
order
Ambient temperature too high Check and correct; if necessary, draw
Condenser externally clogged Clean condenser.
Electric power supply to
compressor is interrupted
Thermal protection of
refrigerant compressor motor
has tripped
Electronic drain system
clogged
Automatic drain out of order
Hot gas bypass valve
incorrectly set or out of order
Remedy
Replace valve.
Increase loading profile (longer
and/or more load cycles
required).
If not possible, consult Atlas
Copco.
Remedy
Check and correct; if necessary, clean the
aftercooler of the compressor.
cooling air via a duct from a cooler place or
relocate the compressor.
Have circuit checked for leaks and
recharged.
See below.
See below.
See below.
Replace.
Have checked fan/fan motor, if necessary
replace.
cooling air via a duct from a cooler place or
relocate the compressor.
Check and correct as necessary.
Motor will restart when motor windings have
cooled down.
Have system inspected.
Clean the filter of the automatic drain by
opening the manual drain valve. Check
functioning of the drain by pushing the test
button.
Have system checked. If necessary,
replace the automatic drain.
Have hot gas bypass valve adjusted.
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