OPERATION OF CONTROL AND OPERATING UNIT ENGLISH Translation of the Original
34
454522.68.07-01-E
27.06.2012
11 OPERATION
OF
CONTROL
AND
OPERATING
UNIT
The P030 Chiller is switched on by means of power disconnect switch (main switch) which also
doubles as an EMERGENCY STOP switch. The P030 Chiller is now ready for operation, and
control and operating unit takes over the control of the water outlet temperature. It is not possible to
start up the unit for as long as there is an active low water level or dry run protection signal.
11.1 Control and Operating Unit ST 181
No. Function No. Function
1 Display 7
SET call-up of setpoint
S1 (compressor control)
S2 (not used)
2 Alarm status displays
General fault alarm
Temperature alarm
Low water level
Pump
Refrigeration fault
High pressure HP
Low pressure LP
9 HP/LP button
Reading of HP sensor -> HP/LP button
pressed
Reading of LP sensor -> HP/LP +
DOWN button pressed 3 Control modes
1 Control setting 1 On
2 Control setting 2 On
3 Control setting 3 On
4
UP button
to increase setpoint or parameter value
5
DOWN button
to decrease setpoint or parameter value
10 No function
6
Buzzer button
Press 1x: buzzer off
Press 2x: alarm reset
11 No function
Control and Operating Unit ST 181
Actual values
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General