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2WAY SYSTEM
Outdoor Unit Repair Procedures
3
3. Backup Operation
This system includes an emergency automatic backup function that allows the A/C 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 Operation for Compressor
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, “ ” flashes on the wired remote controller only to inform the user that operation
is in backup mode. However this is not displayed on any other control devices.
* Backup operation is intended as emergency operation until repairs are made. 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 the item “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
<If the failed outdoor unit is not the No. 1 unit>
• Settings at No. 1 unit (main unit)
Switch on outdoor unit control PCB Action
System address (SW2, SW1) No change
No. of indoor units (SW4, SW3) No change
No. of outdoor units (SW6) Subtract the number of failed units from the current setting.
Outdoor unit No. (SW5) No change
• 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 dis-
connect the wiring between the outdoor units.
SM830253-00_欧州2way7_SM-TRSM.indb 6 16/08/26 19:25:02
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