5 Circulation mode
10
99640x6xx-mub-de – V08
2016/07
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).
Three different operating modes of the circulation pump are set at the controller
(see controller instructions, menu "Func" / "F02"):
Pulse-controlled operation (depending on the demand / requirements):
The short opening of a hot water tap (tap pulse: ~2 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. The circulation will start 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 operating mode, the circulation only starts if the adjustable minimum temperature
on the circulation temperature sensor is not reached during the chosen period of
operation. The circulation stops after the required temperature has been reached
or after the end of the chosen period of time.
The operating modes can be combined with one another as wished, f. ex. the time- and the
temperature-dependent operating modes. The circulation is only active if the temperature at the
circulation temperature sensor falls below the required value and if the time window is active.
Outside the time window, the circulation pump can be started by a tap pulse if the
pulse-controlled operation mode is additionally activated.
NOTICE
Damage to property!
When the Friwa is delivered, the circulation is not activated (see controller instructions, menu:
"Func" / "F02" set to "OFF"). Once the circulation line mounted, it is mandatory to select and
preset the operating mode. The revolution speed of the circulation pump must be determined
by the PWM signal (factory setting: 40 %).
