Section VIII - Troubleshooting
Symptom/Probable Causes:
Corrective Action:
Quincy Compressor
®
- QSB/T
™
61
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
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
MPC
VALVE
.
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
. C
LEAN
OR
REPLACE
AS
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
.
Summary of Contents for QSB Series
Page 2: ......
Page 9: ...Section I General Quincy Compressor QSB T 5 MODEL IDENTIFICATION...
Page 21: ...Quincy Compressor QSB T 17 THIS PAGE INTENTIONALLY LEFT BLANK...
Page 27: ...Quincy Compressor QSB T 23 THIS PAGE INTENTIONALLY LEFT BLANK...
Page 71: ...Quincy Compressor QSB T 67 THIS PAGE INTENTIONALLY LEFT BLANK...
Page 72: ...Appendix A Dimensional Drawings 68 Quincy Compressor QSB T QSB 15 50 HP air cooled...
Page 73: ...Appendix A Dimensional Drawings Quincy Compressor QSB T 69 QSB 15 50 HP water cooled...