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
