Daikin BRR9B1V1, Installation Manual

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10 | Troubleshooting
Installation manual
31
BRR9B1V1
Communication box
4P617761-1 – 2020.04
10 Troubleshooting
In this chapter
10.1 Troubleshooting for PCB for indoor unit communication ..................................................................................................... 31
10.2 Troubleshooting for PCB for outdoor unit and capacity up unit communication ................................................................ 31
10.1 Troubleshooting for PCB for indoor unit communication
What to check? How to check? Solution
No Modbus
communication Incorrect Modbus address setting was present at
power ON on the Modbus interface DIII. During power OFF, set DS2 on A1P to
the required Modbus address. See
"8.3 To set the addresses of the
indoor units"
[
4
24]. The ON/OFF
status of the DIP switch is detected
only at the time of power ON of the
PCB.
No Modbus address is set (=DS2: OFF/OFF/OFF/
OFF). Set DS2 on A1P to the required
Modbus address. See
"8.3 To set the
addresses of the indoor units" [
4
24].
10.2 Troubleshooting for PCB for outdoor unit and capacity up unit
communication
What to check? How to check? Solution
Address setting of each
unit Data of each address can be checked on the
monitoring system. Set the addresses of the outdoor
unit and capacity up unit again. See
"8 Configuration" [ 4 22].
Slave address setting DIP switches (DS1, DS2) of the communication
box PCB (A2P). Set the slave address correctly. See
"8.4.2 To configure the
communication box PCB for the
outdoor unit and capacity up
unit"
[
4
26].
Parity setting Parity setting on the monitoring system against
the parity setting on the communication box. Set the parity setting correctly. See
"8.4.2 To configure the
communication box PCB for the
outdoor unit and capacity up
unit"
[
4
26].
Stop bit setting Stop bit setting on the monitoring system against
the stop bit setting on the communication box. Set the stop bit setting correctly. See
"8.4.2 To configure the
communication box PCB for the
outdoor unit and capacity up
unit"
[ 4 26].