Panasonic U-120ME2U9 Service Manual page 46

11. Backup Operation
11. Backup Operation
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
1
(2) Manual Backup Operation
The manual backup can be used when it is necessary to close the service valve for maintenance, etc.
1
Backup operation procedure
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).
2
Type of outdoor unit
3
SW7 switches to turn ON
4
Type of outdoor unit
SW7 switches to turn ON
5
(3) Close all service valves at the failed outdoor units.
6
(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.
7
8
9
Display (factory present mode)
Non-displayed
U-72ME2U9
U-96ME2U9
INV1 + BACKUP
AC2
INV
AC1
BACKUP
U-72ME2U94
U-96ME2U94
INV1 + BACKUP
INV1 BACKUP
INV2
U-120ME2U9
U-144ME2U9
INV1 + INV2 + BACKUP
ON ON
OFF OFF
INV BACKUP
INV2 / AC
U-120ME2U94
U-144ME2U94
INV1 + INV2 + BACKUP
ON ON
OFF OFF
INV1 BACKUP
INV2
1 - 38
2WAY VRF SYSTEM
2WAY VRF SYSTEM
Control Functions
Control Functions