Advertisement
17. Backup Operation
17-2. Manual Backup
If an alarm that does not result in automatic backup occurs frequently, possible causes include failure (such as
refrigerant leakage) of a functional part at an outdoor unit other than the unit where the alarm occurs.
In this case, because the outdoor unit service valve must be closed, backup operation must be performed manually.
(1) Backup operation procedure
[1] Disconnecting the failed outdoor unit
(A) Reduce the number of outdoor units set at outdoor unit No.1 by the number of failed outdoor units. Then
1
turn OFF the power or disconnect the inter-unit communications line at the failed outdoor units.
(B) Close all service valves at the failed outdoor units.
(C) Reset the power at outdoor unit No.1.
[2] Disabling operation of 1 compressor
At the S010 switch on the PCB of the failed outdoor unit, turn ON the switch for the compressor to disable, and
turn ON the "backup" switch.
<S010 switch>
• In order to perform simultaneous backup operation for 2 or more compressors, use a combination of the switch
settings shown above.
INV
AC1
AC2
(A) Compressor 1 backup
(B) Compressor 2 backup
1 - 32
3-WAY ECO-i SYSTEM
Backup
ON
OFF
Control Functions
Advertisement
