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Air pressure rises above maximum
and causes safety valve to blow off
Working pressure setpoint incorrect.
Adjust setting.
Air intake throttle valve does not close for some reason.
Check position throttle valve.
Disconnect loading solenoid valve from throttle valve housing
and connect independent compressed-air line to throttle valve
housing. Repeatedly admit air and listen for opening and
closing sound of throttle valve. If sound is not evident, remove
unloader valve assembly, dismantle and inspect. Replace parts
where necessary.
Unloading valve malfunctioning.
Remove and inspect unloading valve and blow-off silencers.
Compressor overheating
Insufficient compressor cooling.
Move unit away from walls; when banked with other units,
leave space between them.
Oil cooler clogged externally.
Clean oil cooler.
Oil cooler clogged internally.
Consult Atlas Copco.
Compressor oil filter clogged.
Replace oil filter.
Compressor oil level too low.
Before checking compressor oil level, wait approx. 10 minutes
after unit has stopped.
Add correct oil, if necessary. Never overfill.
Fan blade broken or fan drive defective.
Check and correct, if necessary.
Working pressure too high.
Adjust setting.
Pressure ratio over compressor element(s) too high.
Consult Atlas Copco.
Electric blow-off valve malfunctioning.
Check interstage pressure. Check functioning of loading
solenoid valve. Replace diaphragm of blow-off valve if
necessary.
Bypass valve of oil cooler remains stuck in open position.
Remove bypass valve, clean and inspect.
Symptom
Possible cause
Corrective action
Summary of Contents for PNS 1250 Cud S3A/T3 APP
Page 1: ...Instruction Manual for Portable Compressors English PNS 1250 Cud S3A T3 APP QSX15 ...
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