User Guide | Optyma™ iCO2
16 | BC408445719305en-000101
© Danfoss | Climate Solutions | 2023.01 | LCA012A030
Power supply to CDU
230V AC 1,2m cable for this is included.
Connect Module controller power supply cable to L1 (left terminal) and N (right terminal) of the condensing unit control panel - power
supply terminal block
Caution
: If the cable needs to be replaced, it must either be short-circuit proof or it must be protected by a fuse on the other end.
RS485-1
Modbus interface for connection to the System Manager
RS485-2
Modbus interface for connection to the CDU.
1,8 m cable for this is included.
Connect this RS485-2 Modbus cable to terminal A and B of the condensing unit control panel - Modbus interface terminal block. Do not
connect insulated shield to ground
RS485-3
Modbus interface for connection to the evaporator controllers
3x LED Function explanation
• Blue led is ON when the CDU is connected and polled operation is complete
• Red led is flashing when there is a communication fault with an evaporator controller
• Green led is flashing during communication with an evaporator controller
The green LED next to the 12V power supply terminals indicates "Power OK".
Electric noise
Cables for data communication must be kept separate from other electric cables:
- Use separate cable trays
- Keep a distance between cables of at least 10 cm.
