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12. BACKUP OPERATIONS (EMERGENCY OPERATION)
When a trouble occurs in an outdoor unit or in one of the compressors in an outdoor unit, the malfunctioning
unit or compressor stops and a backup operation (emergency operation) is available through the other function-
ing outdoor units and compressors. A backup operation can be set up following the procedure below.
Before Backup Operation
The method of the backup operation will differ depending on the type of trouble. Refer to the following table.
Trouble contents
When a trouble occurs on the both compressors
in the same unit
Trouble of the compressor coil
(Such as defect of compressor coil)
When a trouble occurs on the refrigerating system
parts, fan system parts, or electric system parts
When a trouble occurs on the temperature sensor
or pressure sensor
Backup operation method
Outdoor unit backup or outdoor unit
backup during cooling season (Note 2)
Setup procedure
To item 3 or item 4
(Note 1) When a trouble of the compressor coil etc has occurred, deterioration of the oil will be high.
Therefore do not perform a backup operation, as other units within the system may be damaged.
(Note 2) Only one outdoor unit within a given system can be subjected to the backup procedure.
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