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Special cases / useful information
Note about the initiation of the consecutive defrost
Even if the consecutive defrost master does not itself meet the defrost conditions (e.g. defrost termination
temperature already reached) at the time the defrost should be initiated, the defrost of the groups is still
initiated.
Once a defrost has been initiated in master/slave operation, this can only be interrupted if the parameter
“FA-Funktion"ontheslaveissetto“OFF”foraminimumof10secondsandthenresetto“SLAVE”,see
menu2-2-1–Defrost1.Ingeneral,thisprocedureisonlyrecommendedforcommissioningsituations,asan
interruption in defrosting can result in increased icing.
During the consecutive defrost, the safe defrost, wait and drip times for the slave are retained; the
parameters set by the user on the slave are used.
Defrost times dependent on number of groups and their defrost durations
The defrost start times stored in the defrost master must have sufficient time between them. It must not happen
that another defrost is initiated in the defrost master while the previous defrost is still in progress. If, for
example, there are 3 consecutive defrost groups each with a safe defrost time of 60 minutes for the slaves,
then the time period between two defrost start times on the consecutive defrost master must be at least 3
hours. If a consecutive defrost wait time between the groups has been configured, this time is extended
accordingly (for n defrost groups (n-1) wait times).
Combination with the Master/Slave function
A consecutive defrost slave can also function simultaneously as master in a master / slave defrost via CAN bus
defrost.
Alarms and messages
Thealarm“125 No Defrost” can also indicate that a consecutive defrost has not been correctly configured.
When triggering the consecutive defrost via an external defrost timer, the external 230 V signal, as
usual, may only be present for the duration of the defrost of the controller, i.e. in the case of the master
controller. The other groups can not start their defrost until the defrost of the master ends, by removing
the external signal!
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