Hitachi CIW03-H Installation & Maintenance Manual page 40

Rotation procedure
Operation
System1
System2 Standby
Rotation Cycle Time
※1: In fan mode(Thermo-off).
※2: Choose from "9 hours"(default), "24 hours", "48 hours", "72 hours" and "96 hours".
※3: In order to stabilize the operation state, it shall be started before 30 minutes.
2. Backup operation when abnormality occurs
If an abnormality occurs during the rotation operation, the standby refrigerant systems are operated.
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.
A16381TMF2
Standby
Operation
30Mins
3
2
Standby
Operation
30Mins
Operation
Standby
Abnormality occurs
Operation Thermo-off
Standby Operation
Backup operation when
abnormality occurs
22. Backup System Setting
Standby
Operation
1
1
37