Sanyo CHDX09663, CHDXR09663 Automatic Backup, Backup operation by disconnecting the outdoor unit

4. Backup Operation

W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures

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 opera- tion.

4-1. Automatic Backup

For details, refer to the control functions section.

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, “CHECK” 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.

•In order to cancel automatic backup mode, it is necessary to reset the power on the control PCB of the outdoor unit where the outdoor unit No. setting (S007) on the control PCB is set to No. 1 (main unit).

(It is also available by resetting power of all the outdoor units.)

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CAUTION

If the power is not reset on the control PCB of the No. 1 outdoor unit (main unit), backup mode operation will continue after the repairs are completed.

Backup operation is intended as emergency operation until repairs are made. Have repairs made as soon as pos- sible.

4-2. 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.

4-2-1. 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 (S003, S002)	No change
No. of indoor units (S005, S004)	No change
No. of outdoor units (S006)	Subtract the number of failed units from the current setting.
Outdoor unit No. (S007)	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.

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