Atlas Copco GA 37 VSD, Instruction Book

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Condition Possible cause Remedy
Excessive oil consumption; oil
carry-over through discharge line Incorrect oil causing foam Change to correct oil
Oil level too high Check for overfilling. Release
pressure and drain oil to correct
level.
Oil separator defective Replace oil separator element
Malfunctioning of the scavenge
line Replace non-return valve in the
scavenge line
Faults and remedies, dryer
For all references hereafter, consult section Air dryer .
Condition Fault Remedy
Pressure dew point too high Air inlet temperature too high Check and correct; if necessary, clean the
aftercooler of the compressor
Ambient temperature too high Check and correct; if necessary, draw
cooling air via a duct from a cooler place or
relocate the compressor
Shortage of refrigerant Have circuit checked for leaks and
recharged
Refrigerant compressor does
not run See below
Evaporator pressure too high See below
Condenser pressure too high See below
Condenser pressure too high
or too low Fan control switch out of
order Replace
Fan blades or fan motor out of
order Have checked fan/fan motor, if necessary
replace.
Ambient temperature too high Check and correct; if necessary, draw
cooling air via a duct from a cooler place or
relocate the compressor
Condenser externally clogged Clean condenser
Compressor stops or does not
start Electric power supply to
compressor is interrupted Check and correct as necessary
Thermal protection of
refrigerant compressor motor
has tripped Motor will restart when motor windings have
cooled down
Electronic condensate drain
remains inoperative Electronic drain system
clogged 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.
Condensate trap continuously
discharges air and water Automatic drain out of order Have system checked. If necessary,
replace the automatic drain.
Evaporator pressure is too
high or too low at unload Hot gas bypass valve
incorrectly set or out of order Have hot gas bypass valve adjusted
Instruction book
API480496 107