OPERATING AND MAINTENANCE MANUAL
Chapter 7 - Electronic controller
iC 215 ÷ iC 780
46
The data in this manual are not binding and they can be modified by the manufacturer without notice. Reproduction of this manual is strictly prohibited
ENGLISH
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7.12.2 How to change a parameter value
• Enter programming mode;
• Press + simultaneously for 3 seconds
• Select the desired parameter.
• To change the value press .
• Change the value with or .
• Press to store the new value and to go to the code of the next parameter.
To exit, press + when a parameter is displayed, or wait 240 seconds without pressing any buttons.
The new value you have entered is saved also when you exit the parameter setting function by waiting for it to time out
automatically without pressing .
7.13 Use of the hot-key (function UPL)
7.13.1 Programming the board with the hot-key
With instrument off:
• Insert the key.
• Switch on the instrument.
• Data download now starts from the key to the instrument.
During this stage adjustments are blocked and the lower display shows flashing message “doL”.
At the end of the procedure one of two messages will be shown on the upper display:
•“End” if programming was successful (control starts after 30 seconds).
•“Err” if programming failed.
In the event of an error the instrument must be switched off and switched on again to repeat the operation or start with normal
control (in this case the key must be unplugged when the instrument is off).
7.13.2 Hot-key programming
Important: the hot-key saves the instrument parameters but it does not program them.
With unit switched on:
• Insert the key.
• Enter the functions menu
• Select the function UPL on the lower display
Press to start data download from instrument to key.
During this stage the lower display shows flashing message “UPL”.
At the end of the procedure one of two messages will be shown on the upper display:
•“End” If programming was successful
•“Err” if programming failed.
To exit the UPL function press or wait for the time-out (15 sec) to elapse
7.14 Unit adjustment and control
7.14.1 Compressors control
The electronic controller manages compressor start and stops, observing the minimum run times.
The following section describes the two methods of control and rotation.
7.14.2 Choice of compressors control type
The controller features the facility to choose between two temperature control types:
• Proportional
• Neutral Zone (factory setting)
7.14.3 Proportional control
For chillers, proportional control uses the setpoint temperature value as a reference and a deviation value called the
differential. When the measured temperature increases the system progressively starts the compressors. When the
temperature falls below the differential the compressors are progressively stopped.
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