13
STOP RUN
CHILLER
REF PUMP
PURGE PUMP
ABS PUMP
STAND BY
DILUTION
SAFETY CIRCUIT
CHILLER ALARM
POWER
STOP RUN
OPERATION
BUZZER STOP LOCAL
REMOTE
SET BACK
1
2
4
6
7
8
9
10
12
5
11
3
Fig. 9 - Typical control board
Legend
1 Operation indication light: The operation indication light is on when the chiller is running.
2 Stop indication light: The stop indication light is on when the chiller is shut down.
3 Alarm indication light: The alarm indication light is on when an alarm occurs.
4 Remote/local select key with LED: To select remote operation or local operation.
5 Operation select key with LED: Key used to run/stop the chiller.
The stop key is also used for alarm rset.
6 Data display (7-segment LED): Shows the temperature, setpoint, etc.
7 Standby indication light: On when the chiller is waiting for the interlock signals form the chilled water and the cooling water pump.
8 Dilution indication light: On during the dilution cycle.
9 Safety circuit indication light: On when power is supplied to the control circuit.
10 Power indication light: On when power is supplied to the control circuit.
11 Data select key: To change the menu and set a new value.
12 Alarm buzzer stop key: To stop the alarm buzzer.
3.2 - Description of keys and their functions