Panasonic U-8ME1E81 Service Manual page 47

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 information display
If a wired remote controller is present,
12-1-4. Check for Blinks When Automatic Backup Setting
When operating the automatic backup by setting the outdoor unit EEPROM, blink check on the remote controller
and centralized control systems is enabled to change for non-displayed.
EEPROM setting in main outdoor unit
CODE: 49
Setting No.
Display (factory preset mode)
0
1
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 only the number of failed outdoor units.
(2) At the SW7 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
(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 SW7 switch on the PCB of the failed outdoor unit, turn ON the switch for the compressor to disable,
and turn ON the "backup" switch.
<SW7 switch>
INV
(A) Compressor 2 backup
• 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.
Non-displayed
8 hp, 10 hp
INV+BU
AC1
AC2 Backup
ON
OFF
(B) Compressor 3 backup
ON
OFF
Control Functions-Outdoor Unit
12 hp, 14 hp, 16 hp
INV+AC1+BU
1 - 39
2WAY SYSTEM
18 hp, 20 hp
INV+AC1+AC2+BU
ON
OFF
1