Sullair SAR 180 - Page 30

8.2 - FAILURE TO DEPRESSURISE
Page 30 of 34
VISUAL
INDICATION
All pressure gauges
showing line pressure
for longer than 5
minutes
All gauges showing
line pressure
POSSIBLE CAUSE
Loss of power
Cam timer failure
Poor signal pressure to
exhaust cylinder
Sticking exhaust
cylinder
Bypassing exhaust
cylinder
Faulty logic control
Too much air flow from
pneumatic cam timer.
Neon indicator is on
dryer goes through
cycle sequence
CHECK
Power on lamp and
incoming supply
Check free movement
of timer, Check fuse.
Check using pressure
gauge at cylinder
Remove and check
operation manually
Remove non
pressurised side tube,
check for air leak from
fittings
Check function by
bypassing
Check for air leak at
exhaust valve.
Exhaust valve failure
to open
Check operation and
leaks on changeover
valve
REMEDY
Replace fuse check
wiring
Replace motor gearbox.
Replace fuse
Trace leak causing low
pressure
Lubricate if necessary or
replace seals
Replace seals or cylinder
Change if necessary
Change if necessary
Check exhaust valve
operation
Check for air leaks on
control fittings and logic
elements. Replace if
necessary.