Panasonic U-8MF2E8 Service Manual page 54

12. Backup Operation
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.
1
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 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 disable,
and turn ON the "backup" switch.
Outdoor unit
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>
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 (factory preset mode)
Non-displayed
8hp, 10hp
INV + BU
INV AC1 Backup
ON
OFF
ON
OFF
12hp, 14hp, 16hp
INV + AC1 + BU
hp = horsepower
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3WAY SYSTEM
Control Functions