Quincy Compressor 50093-103 User Manual
Page 66
60
INLET VALVE NOT OPENING OR CLOSING IN RELATION TO SYSTEM DEMAND
PROBABLE CAUSE
CORRECTION
Improper setting of vacuum pressure
switch or faulty switch
Adjust vacuum pressure switch to proper setting or replace
switch, if faulty.
Improper functioning of inlet valve
piston
Check piston and cylinder bore. Repair or replace as
needed.
Jammed air inlet valve assembly
Check air inlet valve bushing and shaft. Check piston and
cylinder bore. Repair or replace as needed.
Faulty differential pilot valve
Repair or replace as necessary.
Broken spring in air inlet valve
Replace spring.
Faulty solenoid valve
Repair or replace as necessary.
Faulty shuttle valve
Repair or replace as necessary.
Loose wiring connections at solenoid
valve/pressure switch
Check and tighten wiring terminals.
Incorrect vacuum switch setting
Adjust pressure switch to proper setting.
Faulty vacuum switch
Replace switch.
Leaks in control lines
Check all control line fittings and tubing.
VACUUM PUMP DOES NOT LOAD WHEN VACUUM LINE PRESSURE RISES
PROBABLE CAUSE
CORRECTION
Faulty vacuum pressure switch
Repair or replace as necessary.
Loose wiring connection
Check and tighten wiring terminals.
Jammed air inlet valve assembly
Check and repair air inlet valve.
Faulty solenoid
Repair or replace as necessary.
Faulty timer
Check and replace timer.
Faulty differential pilot valve
Orifice plugged. Clean or replace as necessary