Blue Box KAPPA V SR, Installation, Operating And Maintenance Manual

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Blue Box 38
4.15.3 Potential free contacts
The following potential free contacts are available:
- 1 potential free contact for general alarm (terminals 100 - 101 - 102)
- 1 potential free contact for each compressor (option)
- 1 contact for each pair of fans (option)
- 1 contact for each pump (option - ST models)
4.15.4 Circulating pump electrical connections
The external interlocks of unit must close for the unit to operate. The normally open external water circulating
pump contactor terminals must be wired in series with terminals 1 and 2, on the unit control panel, to ensure that
the chiller can only start after the pump is in operation.
In ST units external enabling contacts 1-2 must be jumpered (unless they are required for system functions).
Turn on the pump before the unit starts and stop it after the unit has
stopped (recommended time delay: 60 sec.).
4.15.5 Microprocessor controllers
Chillers and heat pumps KAPPA V SR are equipped with the pCO
2
microprocessor controller.
The pCO
2
electronic microprocessor controller with the DBBB0*P20Z program is designed to manage chiller and
heat pump units, with control of 2 compressors having 2 capacity steps each.
The program configuration manages the total control of the air-cooled unit with plate exchangers including
compressor start/stop times, safety devices and other auxiliary functions such as condensation control in cooling
mode, evaporation control in heat pump mode, free-cooling, heat recovery 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.
4.15.6 RS485 serial interface (optional)
All KAPPA V SR units can be equipped with a serial interface board for supervision or remote
diagnostics functions by means of a computer.
The serial interface board plugs into a dedicated slot on the connection board.
Connection to the supervision or remote diagnostics serial line is executed in compliance with standard RS485
and is achieved by means of the serial interface boards.
When the serial interface board is inserted the following communications protocols are available: Carel, Modbus-
jbus, BacNet. If a connection is to be made with networks that utilise the Lon-Talk protocol, a dedicated board
must be installed. In this case, a conversion gateway is not required.