ST18 & ST22 (U.S.A. & Mexico) Operation & Maintenance Manual 6: Maintenance
88291013-137 R05
Subject to EAR, ECCN EAR99 and related export control restrictions. 37
Table 6-2: Troubleshooting guide lists some compressor
symptoms with their most probable causes and remedies
Table 6-2: Troubleshooting guide
Symptom Possible causes Remedy
High discharge air
temperature
Low fluid level in fluid/air separator Check fluid level. Add fluid if necessary.
Cooler fin dirty Clean cooler fin
Fluid filter clogged and bypass valve
failed
Replace fluid filter element
High ambient temperature Improve ventilation
High resistance in exhaust duct
• Enlarge exhaust duct
• Install fan in the duct
Thermal resistor temperature trans-
ducer RTD failure
Check RTD connector. If the connector
is good, replace RTD.
Fan motor damaged Check and repair fan motor
Air supply pressure
lower than pressure
rating
Air demand higher than air supply
• Reduce air demand
• Check piping for air leaks
Air filter clogged Replace air filter element
Inlet valve does not open completely
Check movement of inlet valve. Check
settings of the pressure relief valve and
pressure regulator.
Pressure transducer fault
Check transducer’s contacts. Replace
transducer if contacts are normal.
Pipeline pressure
higher than unloading
pressure
Pressure transducer fault
Check transducer’s contacts. Replace
transducer if contacts are normal.
Unloading components (e.g. blow-
down valve, inlet regulator valve) are
not working properly
Check if unloading components are
working normally
Solenoid valve unload failure Check solenoid valve
Control pipeline is leaking air Check if control pipeline is leaking air
Fluid consumption too
high
Purge oil return line filter or nozzle
blocked
Clean purge oil return line filter and noz-
zle
Fluid/air separator element damaged
or washer displaced
Check fluid/air separator element and
washer. Replace if necessary.
System piping is leaking fluid Check if system piping is leaking fluid
Fluid level too high Discharge some fluid
Excessive fluid foam Change fluid
Vibration and noise
increased
Isolator damaged Replace isolator
Fan fault Check centrifugal fan
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