28
HDK-MT350_EN_06
Display
Cause
+20
Upper measuring range limit exceeded
999
Dewpoint sensor defective
sens
Dewpoint sensor not powered
Cable defective
sensor defective
or
–999
SEr.
The
SEr.
display appears after every 8000 operating hours.
(service) is displayed for periods of 1 minute, alternating with
the default display.
Notify the instructed service personnel, as a routine service is
now due.
For instructions on how to eliminate faults, see chapter
LED Economy cycle (4)
The diode lights up when the dryer is switched on and in the standby phase and
no regeneration air is required.
Pressure gauges
Pressure gauges are assigned to both vessels and show the operating
overpressure. The operating overpressure indicates the operating phase of the
relevant vessel:
During adsorption the pressure gauge should indicate the nominal operating
overpressure.
During regeneration the indication of the pressure gauge on the regenerating
vessel
—
should decrease in the expansion phase from operating overpressure to
0 bar overpressure,
—
indicate an overpressure of 0 bar in the dehumidification phase.
If the overpressure does not drop to 0 bar after a vessel has been depressurised,
the vessel contains residual pressure, or “back pressure”. Back pressure can also
cause an increase in noise on the sound absorber.
