Panasonic U-72MF2U9 Service Manual page 51

11. Backup Operation
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.
0 Display (factory present mode)
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
12-2-1. 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 disable,
and turn ON the "BACKUP" switch (SW7).
Type of outdoor unit
SW7 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.
12-2-2. Disabling operation of one compressor (Type: 120, 144)
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).
Type of outdoor unit
SW7 switches to turn ON
Non-displayed
72 96
INV1 + BACKUP
ON
OFF
AC2
INV
AC1
BACKUP
In the case of
1st compressor
In the case of
2nd compressor
120 144
INV1 + INV2 + BACKUP
ON
OFF
INV BACKUP
INV2 / AC
120 144
ON
OFF
INV BACKUP
INV2 / AC
ON
OFF
INV BACKUP
INV2 / AC
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2WAY VRF SYSTEM
3WAY VRF SYSTEM
Control Functions
Control Functions
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5
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7
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9