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G) Fault Finding
PROBLEM
VISUAL INDICATION
Poor
Moisture content
Dewpoint.
indicator (amber).
Hygrometer (if fitted).
High
Pressure gauges.
pressure
drop.
Differential pressure
indicator in red.
Failure to
No depressurisation.
purge.
Loss of dewpoint.
Excessive
Cables overheating or
Power
overloading
Consumption
and tripping.
(Heat
Regenerative
models only).
PROBABLE
CHECK
CAUSE
Inlet temperature
Check inlet
too high.
temperature.
Contaminated
Check desiccant.
desiccant.
As above.
Check fuses and
calibration of
hygrometer.
Excessive outlet
Check outlet flow.
flow.
Blocked filter.
Filter element.
No signal to
Check signal line.
exhaust valve.
Purge air orifice
Check for purge
closed.
air.
Exhaust silencer
Check condition
blocked.
of silencer.
Excessive purge
Check purge flow
flow.
with rotometer.
36
REMEDY
Reduce inlet
temperature.
Replace desiccant
and eliminate
source of
contamination.
Replace fuses,
re-calibrate and
if necessary
replace.
Regulate.
Replace filter.
Replace signal
line if necessary.
Reset purge air
to suit air
demand.
Replace if
blocked.
Regulate purge
flow accordingly.
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