Panasonic U-8ME1E8E Service Manual page 44

12. Backup Operation
12-1-2. Start of automatic backup operation
If the above alarms occur, the alarm is displayed on the remote controller etc. Pressing the remote contoller
button again starts automatic backup mode.
12-1-3. Backup operation infomation display
If a wired remote controller is present,
12-2. Manual Backup Operation
The manual backup can be used when it is necessary to close the service valve for maintenance etc.
- Backup operation procedure
[1] Disconnecting the failed outdoor unit
(1) Reduce the number of outdoor units set at outdoor unit No.1 by the number of failed outdoor units.
(2) At the S010 switch on the PCB of the failed outdoor unit, turn ON the switches for all compressor to dis-
able, and turn ON the "backup" switch.
Outdoor unit hp
Switches to turn ON INV+BU INV+AC1+BU
(3) Close all service valves at the failed outdoor units.
(4) Reset the power at outdoor unit No.1.
* The outdoor unit that backed up all compressors is not controlled by CCU (main outdoor unit). Even if all
compressors of the main outdoor unit are backed up, they are not controlled by CCU. However, the CCU
function stays active.
[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.
display blinks during operation.
12 hp . 14 hp . 16 hp
8 hp 10 hp
INV AC1
(A) Compressor 2 backup
(B) Compressor 3 backup
1 - 37
Control Functions-Outdoor Unit
18 hp
INV+AC1+BU INV+AC1+AC2+BU INV+AC1+AC2+BU
AC2 Backup
ON
OFF
ON
OFF
ON
OFF
2WAY SYSTEM
1
20 hp