9-5. Outdoor Unit Automatic Backup Operation Outline
Outline
In case of the outdoor unit failure, this product supports automatic backup operation for both header and
follower units.
In system with connection of two or more outdoor units, if the automatic backup operation setting is ON and
the following failure modes occur, the automatic backup operation function allows continuous operation.
• Compressor failure ( short-circuit, or no compressor can be operated.)
• Pressure Sensor (Pd / Ps) / Temperature Sensor ( TD1, TD2, TS1, TS3, TE1, TE2, TE3, TK1, TK2, TL1, TL2,
TL3) failure
If the interface P.C. board or electric circuit system falls, indoor-outdoor unit communication signal trouble (
check code: E**) or setting trouble ( check code:L**) happens, the automatic backup operation cannot function,
and a trouble is confirmed. In this case, do [Outdoor Unit Backup Setting] as described before.
Outdoor Unit Automatic Backup Setting
To Turn ON the automatic backup operation setting, change the outdoor unit check Code 3D to 0.
(The factory setting is ON, to disable the automatic backup operation setting, change the outdoor unit DN
Code 3D to 1)
Check Code (----) Display during Outdoor Unit Automatic Backup Operation
If the outdoor unit is on the automatic backup operation, check code (----) will be displayed on the remote
controller. The check code (----) will be also displayed on the outdoor unit targeted for backup operation, please
contact a service center immediately to repair the failure outdoor unit.
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