With dewpoint-sensing control (optional)
34
HDK-MT350_EN_04
Monitoring dryer operation
The dryer operates fully automatically. However, you should carry out the regular
checks described in the Chapter
Maintenance and repair of the dryer
Warning against sudden air ejection!
During expansion the pressure is released suddenly through the muffler:
A loud expansion noise is caused which may damage your hearing.
Particles carried in the air flow act like bullets and can injure your
eyes or skin.
Always wear eye and ear protection, therefore, when you are in the
vicinity of the dryer!
With dewpoint-sensing control (optional)
Display of dewpoint
If the dryer is equipped with a dewpoint-sensing control system, the digital display
at the front of the switchbox shows the currently measured dewpoint. The range
of display is –100 °C (-148 °F) to +20 °C (68 °F).
If the set dewpoint is exceeded, the system automatically completes a switchover
between the vessels. The dewpoint at which a switchover is made is preset at the
factory.
► After commissioning or extensive maintenance work, check the dewpoint
display at the dryer.
Under certain circumstances, the desired dewpoint is only reached after
prolonged operation.
Error messages
If the measured dewpoint exceeds the preset alarm limit (5 °C (41 °F) above the
switchover value), the displayed dewpoint value is flashing.
Error codes and their causes:
Display
Cause
+20
Upper measuring range limit exceeded
999
Dewpoint sensor defective
sens
Dewpoint sensor not powered
Cable defective
Sensor defective
or
–999
SEr.
After 8000 operating hours, "
SEr.
" (service) is displayed for
periods of 1 minute, alternating with the default display.
Notify the service personnel of the manufacturer, as a routine
service is now due.