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17. Duty Rotation and Backup
The Rotation function is designed for units operating in critical applications (e.g. in server rooms that
require lots of cooling). In this case, the system is equipped with an extra backup unit. Enabling
Rotation then allows for:
● Rotation: because the system is equipped with more units than are required to provide the heating/
cooling load, one of the units will remain inactive during normal operation. After a set time
(i.e. "Rotation cycle time"), the inactive unit will start operating and a previously active unit will
become inactive (i.e. duty rotation). Because the units are alternately allowed to take a break, the
lifespan of the system increases.
● Backup: having a backup unit allows for additional system redundancy. If an active unit goes into
error, Rotation makes sure the inactive one takes over.
BACK-UP
NOTE
● To let the backup unit reach its cooling/heating capacity, an overlap period is included in which
all units are active. (cfr. field setting 1E-7)
● The rotation order depends on the set Unit Number. For instructions on how to change the Unit
Number, contact your local dealer.
● To be able to use the Rotation function, group control is required. For more information, see
Connection diagram"
BRC1E53
–
4P419250-1
2015.10
BACK-UP
ERROR
Duty Rotation and Backup
BACK-UP
Installer reference guide
"22.
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