Quincy Compressor QSI Series, Instruction Manual

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Section IX - Troubleshooting
Probable Causes: Corrective Action:
118
Quincy Compressor-QSI
®
Inlet Valve Not Opening Or Closing In Relation To Air Demand:
Improper setting of air pressure switch or
faulty switch
Excessive moisture in control air line at air
cylinder
Improper functioning of inlet valve piston
Jammed air inlet valve assembly
Faulty solenoid valve
Faulty shuttle valve
Loose wiring connections at solenoid valve/
pressure switch
Broken spring in air inlet valve
Compressor Does Not Unload When There Is No Air Demand:
Incorrect air pressure switch setting
Faulty air pressure switch
Faulty blow down valve
Faulty solenoid valve
Faulty differential pilot valve
Leaks in control lines
Leaks in service lines
Adjust fluid level to recommended fluid level
by draining the reservoir. Use fluid level
gauge as a guide.
Clean scavenger line orifice and tube.
Correct in accordance with the instructions
in “High discharge air temperature” section of
this troubleshooting guide.
Reservoir pressure should not fall below 50
PSIG when running loaded. Check system
CFM requirement and minimum pressure check
valve.
Change air/fluid separator.
Check for leaks and correct.
Replace seal assembly and o-rings.
Use recommended fluids only. See Compressor
Fluid Section.
Use remote air intake mounting.
Use specialized air filter. Contact an Autho -
rized Quincy Distributor.
Adjust air pressure switch to proper setting or
replace switch, if faulty.
Service control air line filter daily.
Check piston and cylinder bore. Repair or
replace as needed.