21 Functions in the cascade network
54 99E13331xx-mub-en - V07 2021/03
21.1 Circulation
The settings for the circulation menu can only be made and monitored via the client in the
cascade network.
In addition, the circulation pump must be electrically connected via the client.
For further information, see chapter 17.1.
There is always only one circulation pump within the entire cascade. If this function is activated,
it only appears on the client display. The client display is shown as in the display view in
chapter 16.1.
Identically to the single controller, the circulation function provides 3 different operating modes,
which can be combined with each other.
• Temperature control
• Time control
• On demand mode
Circulation sensor
T - cold water- cascade
External sensor
The special characteristic of the temperature control at
the cascade is the selection of a new sensor which is
called
T cold water cascade
. Alternatively, an
External
sensor
can be selected.
T cold water cascade is the highest temperature of the T-CW sensors of all active
modules/domestic hot water modules.
If an external sensor is selected, this sensor must be connected to the client. For a FriwaMini
Cascade, you can select
Sensor 2
and
Sensor 3
. For a FriwaMidi / FriwaMaxi or FriwaMega
Cascade, the
External sensor
must be connected to the input
Sensor 3
and activated in the
menu item
Circulation sensor
.
The menu item
Debug*
offers the possibility for installers to show the specifications of the
circulation in one window. Which operating modes are active, if a sensor error has occurred, if
the controller is within the time window of the time control, how long the withdrawal took, the
remaining duration of the demand mode as well as the current PWM value of the circulation
pump.
*Settings only visible with installer code (see chapter "User code").
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