37
4.6 System Communication
4.6.1 Communication system include:
(1) Communication among outdoor basic modules.
(2) Communication between ODU and IDU.
(3) Communication among IDUs.
(4) Communication between IDU and wired controller.
(5) Connection between IDU and light board receiver.
(6) Communication between different refrigeration systems.
(7) Graphics of general communication connection.
Fig. 44
4.6.2 Communication mode
CAN bus mode is taken for communication between IDU and ODU and communication
among IDUs.
4.6.3 Selection and connection mode of
VRF
communication material
4.6.3.1 Select communication material
NOTICE!
If air conditioners are installed at places where there’s strong electromagnetic
interference, the communication wire of IDU and wired controller must use shielded wire and
Lennox
VRF Unit
