Start no defines the priority of the compressors with a common System no. The unit with the
lowest Start no will be the first to start. Multisab Master must be identical for all units with the
same System no. See section 6.4. Configuration. Multisab Master specifies whether the
Compr. no or the Start no should define which Unisab III will be the system regulator (System
regulator).
System regulator is responsible for the co-ordination of the involved units. The sensor of the
System regulator (e.g. suction pressure input) is used for the regulation. If Multisab Master =
#Compr the unit with the lowest Compr. no will be System regulator except if the Unisab III
unit in question is shut off or otherwise unable to communicate. In this case the unit with the
next Compr. no will take over as System regulator.
If Multisab Master = #Start the unit with the lowest Start no will be System regulator but only
as long as it is available. If it is not available the unit with the next Start no will take over as
System regulator.
A unit is not available if it is shut off, not communicating, not in Remote mode or in shutdown
alarm condition. An alarm condition may be caused by a sensor error resulting in a change of
System regulator and thus of sensor.
In order for a compressor to become part of a Multisab system, the above key parameters
must be set up. Control Mode must be set for Remote. In other words, the user can include
and exclude the compressor from the Multisab system by changing Control Mode. See section
3.1. Compressor regulation set-up.
Set-up
Engineering manual - Unisab III 1.10
001930 en 2014.09
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