Models 14.4 - 26.4, controller pCO
2
Blue Box - Page 71
8 UNIT WITH pCO
2
MICROPROCESSOR (models from 14.4 to 26.4)
8.1 GENERAL
The pCO
2
electronic microprocessor controller with the DBBB0*P20Z program is designed to manage chiller and
heat pump units, with control of 4 compressors.
The program provides the facility to control water-cooled units with plate heat exchangers and to manage
compressor start and stop times, safety devices and auxiliary functions including condensation control in cooling
mode, heat recovery functions, and other functions described later in this manual.
The necessary hardware is optimised to obtain the maximum advantage from the available inputs and outputs;
the connection between various circuit boards and the user interface terminal is achieved via the pLANE using the
dedicated RS485 serial connector for network connections.
Each unit can also be connected to remote supervision and/or telediagnostics systems by means of an RS485
serial line.
Detailed information on the operation of the above systems is provided in the specific controller manual supplied
with the unit.
8.1.1 Display
The back-lit LCD display comprises 4 lines and 20 columns.
Figure 30
8.1.2 Keypad
In addition to the LCD display, the user interface is equipped with the following function keys:
“Menu” key: press this key from any menu to return to the opening menu.
Maintenance key: press this key to access the maintenance menus.
Print key: this key is currently not used.
"I/O" key: pressing this key opens the menus containing the status of the digital inputs and outputs
together with the values read on the analogue inputs and the value of the analogue outputs
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