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5 Circulation mode
2020/06
99640x5xx-mub-en – V01
13
5
Circulation mode
The domestic hot water modules FriwaMidi and FriwaMaxi are optionally equipped with a
circulation pump.
The FriwaMidi and FriwaMaxi without circulation can be subsequently equipped with a
circulation set (item no. 640412).
For the operation of the circulation pump, three possible operation modes are stored in the
controller (see controller instructions, chapter
Circulation
).
•
Pulse-controlled operation (depending on the demand / requirements):
The short actuation of a hot water tap (tap pulse: below 5 sec.) starts the circulation
pump. The circulation pump will then run for several minutes (adjustable).
•
Time-dependent operation:
The operation of the circulation pump can be set on a week clock within a freely
selectable period of time. In this operation mode, the circulation is activated at the
beginning of the period of time chosen. The circulation will stop after the end of the
chosen period of time.
•
Temperature-dependent operation:
In this operation mode, the circulation is only activated if the adjustable minimum
temperature at the circulation temperature sensor is not reached during the chosen
period of operation. The circulation stops after the required temperature has been
reached.
The operating modes can be combined with each other as wished, f. ex. the time- and the
temperature-dependent operating modes. The circulation is only activated if the temperature at
the circulation temperature sensor falls below the required value and if the time window is
active.
Outside the time slot, the circulation pump can be activated by a tap pulse if the pulse-controlled
operation mode is additionally activated.
ATTENTION
Damage to property!
When the domestic hot water module is delivered, the circulation is not activated (see
controller instructions, chapter
Circulation
). Once the circulation line mounted, it is mandatory
to select and preset the operation mode. The revolution speed of the circulation pump must
be defined by the PWM signal (factory setting: 100 %).