Daikin E-Series Service Manual page 142

SiAU18-715
1.1.3 Judging and reprogramming in case of redundant BP addresses
The BP unit of this system is provided with specific addresses in its production stage. These
addresses are used to conduct various controls. If by any chance (on 3 out of 260000 units)
these addresses are redundant, the system may get in trouble. When replacing the PCB of the
BP unit too, these addresses may be used repeatedly.
Address redundancy checking flowchart
Reprogramming the PCB addresses of BP unit
Modify the DIP switch (DS2) settings on the BP unit's PCB in the following way.
Test Operation
With the system set up, power on both the
outdoor unit and BP unit.
Give a start command from the indoor unit. Does
the compressor start in 20 minutes? (Test run
cannot be made either.)
No
Set the outdoor unit PCB in the monitor mode
and check the number of indoor units being
connected.
Is the number of connected indoor units correct?
No
Yes
Normal
Yes
The compressor is in a non-startup
condition.
Example: thermostat control off,
alarm being issued, heating with
high outdoor
air temperature, compressor
failure, etc.
BP addresses redundancy.
Reprogram the addresses.
H1P (LED A)
OFF ON
H2P (LED 1)
DS2-1
H3P (LED 2)
DS2-2
DS2-3
H4P (LED 3)
DS2-4
H5P (LED 4)
Test Operation
(Q0517)
(Q0444)
129