Models 14.4 - 26.4, controller pCO
2
Blue Box - Page 78
During idle periods do not disconnect the unit from the power supply (the
compressor crankcase heaters must remain switched on in these intervals).
Disconnect the unit from the power supply only in the event of prolonged
disuse (e.g. seasonal shutdowns). For temporary shutdown of the unit
refer to the guide lines given in paragraph 8.4.
Figure 31
Figure 32
8.3 STARTING THE UNIT
For the start-up procedure refer also to the microprocessor controller manual.
- Close the external enabling contacts
- Press the "ON" button on the microprocessor controller
- If all the controls are enabled the display will show the message "UNIT ON"
After having performed the above procedures the unit will start automatically after a delay of approximately 5
minutes, assuming that the enabling signals of the microprocessor, the flow switches, and the water pumps
continue to be present.
If the unit fails to start: do not change internal electrical connections
on penalty of immediate invalidation of the warranty.
8.4 STOPPING THE UNIT
8.4.1 Temporary stop:
- To stop the unit press the "OFF" button on the front panel.
8.4.2 Seasonal stop:
- Disconnect the power supply
- Drain the system circuit (unless it contains a water/glycol solution)
- When the unit is to be restarted repeat the initial start-up procedure
Warning: do not use the machine main power switch to stop the unit:
this switch must be used to disconnect the electrical supply when no
current is flowing on the circuit, i.e. only when the unit is in OFF status.
Note also that if power is disconnected from the unit, the crankcase
heaters will be switched off with the resulting risk of compressor damage
at the time of restarting.
8.5 EMERGENCY STOP
Emergency stops are obtained by turning the red colour main disconnect switch on the electrical panel to position 0.
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