Backup Operation - Panasonic U-120ME2U9 Service Manual

3. Backup Operation

3. Backup Operation
This system includes an emergency automatic backup function that allows the air conditioner to operate during the
period after trouble occurs until repairs are made. However, during repair and at other times, use manual backup
operation.
3-1. Automatic Backup
For details, see the item "11. Backup Operation" under the section 1.
After the alarm details are sent to the control device, control for automatic backup operation begins when the
ON/OFF button of the wired remote controller is pressed again (operation is started after the alarm is cleared).
During this operating mode, "
is in backup mode. However this is not displayed on any other control devices.
In order to cancel automatic backup mode, it is necessary to reset the power of all the outdoor units in the system.
If the power is not reset on the control PCB of the No. 1 outdoor unit (main unit),
CAUTION
backup mode operation will continue after the repairs are completed.
Backup operation is intended as emergency operation until repairs are completed.
Have repairs made as soon as possible.
3-2. Manual Backup
This backup operation is the conventional method of backup operation. It involves disconnecting the failed outdoor
unit from the system, and operating only the normal outdoor units.
For details, see "(2) Manual Backup Operation" of "11. Backup Operation" under the section 1.
3-2-1. Backup operation by disconnecting the outdoor unit
(1) Changing the outdoor unit control PCB settings
Settings at No. 1 unit (main unit)
Switch on outdoor unit control PCB
System address (SW2, SW1)
No. of indoor units (SW4, SW3)
No. of outdoor units (SW6)
Outdoor unit No. (SW5)
Settings at normal outdoor units other than the No. 1 unit
No particular changes
Settings at the failed outdoor unit
No particular changes
However, close all service valves (gas tubes, liquid tube, and balance tube) at the failed outdoor unit, and
disconnect the communication wiring between the outdoor units.
" blinks on the wired remote controller only to inform the user that operation
No change
No change
Subtract the number of failed units from the current setting.
No change
2 - 7
2WAY VRF SYSTEM
2WAY VRF SYSTEM
Outdoor Unit Repair Procedures
Outdoor Unit Repair Procedures
Action
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