LG PQNFB17C1 Installation And User Manual page 110

Installing ACP BACnet
98
Caution
Installing the ACP BACnet
The ACP BACnet installation work needs the professional technique. Therefore, the installation
described in this chapter should be performed by the certified installation professional.
Consult the service center or the professional installation agency certified by us about any
question or request related to the installation.
Check points during the ACP BACnet installation
The number of PI485 connected to one RS-485 communication line
- ACP BACnet provides 4 RS-485 ports for indoor unit connection. (CH 1~4)
- Up to 16 PI485 for outdoor unit can be connected to one RS-485 port, and up to 31 PI485 for
- SINGLE/ventilation can be connected.
The number of the indoor units that can be connected to one ACP BACnet
- One ACP BACnet can be connected up to 256 indoor units. To one RS-485 port, all of 256
indoor units, which is the maximum number that can be connected to the ACP BACnet, may
be connected.
But, to improve the communication performance of RS-485, it is recommended to be divided
and connected to 4 ports.
RS-485 communication cable connection
- There is a polarity in RS-485 communication cable connection, so be careful not to reverse
the connection of the two cables.
- Do not let the length of RS-485 communication cable exceed total of 1 Km.
- RS-485 communication cable must be connected with BUS type.
IP address of the ACP BACnet
- IP address of the ACP BACnet, address of Gateway, and Net mask must be requested to the
person in charge of the network of the corresponding site.
Caution
RS-485 Connection of the ventilation equipment
To connect ventilation equipment, it is recommended to use the ports other than RS-485
communication ports which are connected to air conditioners.