Service Information; Cooling Backup Operation - Fujitsu Airstage V series Service Manual

6-4 SERVICE INFORMATION

SERVICE INFORMATION
Backup operation
Details :
Backup operation is the operating method of replacing compressor while the system is running.
Compressor can be replaced without stopping the system.
But the backup operation may not be able to continue if total capacity of indoor units
in operation is less than 60000BTU.
The work procedure is as follows.

6-4-1 Cooling backup operation

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