2WAY VRF SYSTEM
Control Functions
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11. Backup Operation
2WAY VRF SYSTEM
Control Functions
(2) Manual Backup Operation
2-1. Disconnecting the failed outdoor unit
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
Display (factory present mode)
Non-displayed
(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).
(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.
The manual backup can be used when it is necessary to close the service valve for maintenance, etc.
11. Backup Operation
Backup operation procedure
Type of outdoor unit
SW7 switches to turn ON
U-72ME2U9
4
U-96ME2U94
INV1 + BACKUP
U-120ME2U94
U-144ME2U94
INV1 + INV2 + BACKUP
ON
OFF
INV1
BACKUP
INV2
ON
OFF
BACKUP
INV1
INV2
Type of outdoor unit
SW7 switches to turn ON
U-72ME2U9
U-96ME2U9
INV1 + BACKUP
U-120ME2U9
U-144ME2U9
INV1 + INV2 + BACKUP
ON
OFF
INV
BACKUP
AC2
AC1
ON
OFF
BACKUP
INV
INV2 / AC
2WAY VRF SYSTEM
Control Functions
11. Backup Operation
All compressors of outdoor unit number 2 are backed up
Unit No. 1
Main unit
CCU function
Unit No. 2
Sub unit
Unit No. 3
Sub unit
Unit No. 1
Main unit
CCU function
Unit No. 2
Sub unit
Unit No. 3
Sub unit
Main outdoor unit Sub outdoor unit Sub outdoor unit
Number of setting
2
Not necessary
Not necessary
Unit No.
1
2
3
Main outdoor unit Sub outdoor unit Sub outdoor unit
Number of setting
2
Not necessary
Not necessary
Unit No.
1
2
3
All compressors in unit No. 2 are backed up. Therefore the setting No. of outdoor units installed on the main outdoor
PCB is changed to “2” from “3”.
All compressors of main outdoor unit are backed up
All compressors in unit No. 1 are backed up. Therefore the setting No. of outdoor units installed on the main outdoor
PCB is changed to “2” from “3”.
Same setting
Examples:
Combination of 3
outdoor units with
2 compressors
Examples:
Combination of 3
outdoor units with
2 compressors
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).
SW7 switches to turn ON
Type of outdoor unit
In the case of
1st compressor
U-120ME2U9
U-144ME2U9
ON
OFF
BACKUP
INV
INV2 / AC
In the case of
2nd compressor
ON
OFF
BACKUP
INV
INV2 / AC
U-120ME2U94
U-144ME2U94
ON
OFF
BACKUP
INV1
INV2
ON
OFF
BACKUP
INV1
INV2
SM830237-07_北米向け2WAY_VRF.indb 39
18/06/19 18:55:35
