Quincy Compressor QSB Series Instruction Manual page 65

Symptom/Probable Causes:
Compressor Does Not Unload When There Is No
Air Demand:
I
NCORRECT AIR PRESSURE SWITCH SETTING
F
AULTY AIR PRESSURE SWITCH
F
AULTY BLOWDOWN VALVE
F
AULTY SOLENOID VALVE
F
AULTY DIFFERENTIAL PILOT VALVE
L
EAKS IN CONTROL LINES
L
EAKS IN SERVICE LINES
Compressor Does Not Revert To Load When
Service Line Pressure Drops To Reset Pressure:
F
AULTY AIR PRESSURE SWITCH
L
OOSE WIRING CONNECTION
J
AMMED AIR INLET VALVE ASSEMBLY
F
AULTY SOLENOID
F
AULTY TIMER
F
AULTY DIFFERENTIAL PILOT VALVE
Compressor Will Not Time-out Or Shut Down
When Unloaded (Auto/Dual Only):
F
AULTY TIMER
L
EAKS IN CONTROL LINES
L
EAKS IN SERVICE LINES
F
AULTY AIR PRESSURE SWITCH
F
AULTY AIR PRESSURE SENSORS
Corrective Action:
A
DJUST TO PROPER SETTING
R
EPLACE SWITCH
R
EPAIR OR REPLACE AS NECESSARY
R
EPAIR OR REPLACE AS NECESSARY
R
EPAIR OR REPLACE AS NECESSARY
C
HECK ALL CONTROL LINE FITTINGS AND TUBING
C
HECK LINES BEFORE
R
EPAIR OR REPLACE AS NECESSARY
C
HECK AND TIGHTEN WIRING TERMINALS
C
HECK AND REPAIR AIR INLET VALVE
R
EPAIR OR REPLACE AS NECESSARY
C
HECK AND REPLACE TIMER
O
RIFICE PLUGGED
NECESSARY
C
HECK AND REPLACE AS NECESSARY
C
HECK AND REPAIR ANY LEAKS
C
HECK PLANT AIR DISTRIBUTION SYSTEM FOR
.
LEAKS
R
EPAIR OR REPLACE AS NECESSARY
R
EPLACE AS NECESSARY
®
Quincy Compressor - QSB/T
Section VIII - Troubleshooting
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VALVE
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LEAN OR REPLACE AS
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