Fujitsu AB*A12, Service Manual

Page: 177 / 322

1. Stop the operation, and turn off the power of all outdoor units.
06-86
1-2. Backup operation when compressor of the slave unit 1 is defective.
[Procedure]
(Example: Three outdoor units are connected.)
2. Fully close the 3-way valve (Liquid, Gas, and Oil) of the slave unit 1.
3. Set up the system as two outdoor units.
4. Set the slave unit 2 as Slave unit 1.
5. Unplug the transmission connector from the slave unit 1's PCB,
or do not turn on the power of the slave unit 1 alone at the stage 6.
6. Turn on the power, and wait for 30 seconds or more.
8. It is ready for Backup operation.
7. Check LEDs of the master unit and the slave unit 2 as follows.
Master unit : If the error is less than level 1, it is ready for Backup operation.
Slave unit 2 : No error display
Set the DIP SW 4-1/ 4-2 (Connected number of slave units) of the master unit
from [ON/OFF] to [OFF/ON].
Set the DIP SW 3-3/ 3-4 (Outdoor unit address setting) of the slave unit 2
from [ON/ OFF] to [OFF/ ON].