- 71 -
Compressor capacity or pressure
below normal
Air consumption exceeds capacity of compressor. Check equipment connected.
Choked air filter element. Remove and inspect air filter element. Clean or replace
element, if necessary.
Working pressure setpoint incorrect. Adjust setting.
Engine not up to max. load speed. Check engine and correct if necessary.
Electric blow-off valve malfunctioning. Check interstage pressure. Check functioning of loading
solenoid valve. Replace diaphragm of blow-off valve if
necessary.
Loading solenoid valve leakage. With unit running at max. load speed, disconnect pipe from
loading solenoid valve. If air leaks, remove and inspect loading
solenoid valve. Replace valve, if necessary.
Compressor element(s) not in order. Check interstage pressure and have compressor element(s)
inspected by Atlas Copco.
Air intake throttle valve remains partially closed. 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.
Compressor capacity or pressure
below normal
Safety valve or relief valve(s) leaking. Remove and inspect safety valve or relief valve(s). Replace
valve(s) if not airtight after reinstallation.
Unloading valve leaking. Remove and inspect unloading valve. Replace valve, if
necessary.
Pipe connections leaking. Check connections and repair if necessary.
Symptom Possible cause Corrective action