Hitachi PC-ARFG2-Z Installation & Maintenance Manual page 42

22. Backup System Setting
2. Backup operation when abnormality occurs
If an abnormality occurs during the rotation operation, the standby refrigerant systems return back to
operation.
System Example
System 1 System 2
Rotation procedure when abnormality occurs
Operation
System1
System2 Standby
Rotation Cycle Time
※1: When the abnormality is resolved, it returns to the rotation operation.
Backup operation runs for 30 minutes when abnormality occurs.
All standby systems are in backup operation when abnormality occurs.
A16381H9HF
Standby
Operation
30Mins
Abnormality occurs
Operation Thermo-off
Standby Operation
Backup operation when
abnormality occurs
1
1
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