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8.3 - FAILURE TO REPRESSURISE
VISUAL
INDICATION
Column not
achieving line
pressure before
changeover.
Depressurisation
Dryer fails to
pressurise
Audible noise
loss of gauge
pressure.
No system air
pressure inlet
air only
POSSIBLE
CAUSE
Slow
repressurisation
No air from
exhaust when
dryer
depressurised.
Loss of line
pressure exessive.
Depressurisation
after switching.
Air leaks
Inlet pressure
reading line
pressure, column
gauge reading
zero
Dryer locked off
CHECK
Q.R. valve not opening
Purge valve closed or
blocked
Damaged valve disc
Sticking valve stem
Damaged guide bush
Broken or damaged
exhaust valve disc.
Exhaust valve unable to
close.
Damaged seals/ 'o' rings
gasket failure, Damaged
pipe/tube connections
Both inlet valves closed
Page 35 of 36
REMEDY
Check control signal to
solenoid (black control
pipe)
If OK change valve.
If no signal check output
from controler.
Check and adjust where
necessary.
Check and renew where
necessary.
Check and renew where
necessary.
Change 'o' rings and
gaskets if necessary.
Replace faulty fittings /
seals and soleniods
where necessary.
Remove lockout enter
password protected data
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