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5.4 Controller RDC 2
The controller RDC 2 shows the temperature of the dew point reached by the refrigeration air dryer in
the normal operation. By pressing the UP (▲) button, the outlet temperature of the compressor is
displayed. By pressing the DOWN (▼) button, the condensation temperature is displayed (the
temperature sensor is connected) or the condensation pressure is displayed (the pressure sensor is
connected). In case of fault, an alarm will appear on the display. The alarm automatically turns off
when the dryer is restarted and is operating properly.
a) Sensors used for regulation:
1) T
dew
= Dew point temperature
2) T
comp
= Compressor temperature
3) T
cond
ali p
cond
= Condensation temperature or pressure (4-20 mA)
b) Regulated components:
1) Fan (ON/OFF)
• Fan symbol is displayed when in ON state
2) Compressor (ON/OFF)
• Compressor symbol is displayed when in ON state
3) Drain (ON/OFF)
• Drain symbol is displayed when in ON state
c) Operation of fan and compressor
1) Normal operation:
• The compressor is always running
• The fan is regulated based on measured condensation temperature or pressure
• Dew point temperature is displayed.
2) Alarm operation
• In alarm state the normal operation is overridden.
• If more alarms are activated the last one activated has priority with display and
fan/compressor operation. All other active alarms have to be resolved before
continuing in normal operation.
• Alarm is displayed.
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