18 Installation of the cascade controller
46 99E13331xx-mub-en - V08 2022/07
Reheating Activate the function On, Off Off
Sensor selection Selection of the
sensor
Sensor 2 (only for
FriwaMini), Sensor 3
-
Relay selection Selection of the relay Relay 1, Relay 2 -
18 Installation of the cascade controller
Domestic hot water modules (max. 4) that are connected hydraulically in parallel with each
other are called cascade. The following installation/mounting steps are required to prepare the
modules for the cascade operation.
First connect the domestic hot water modules hydraulically, flush them and fill them
hydraulically.
Then, define which domestic hot water module is called
client.
The term client comes from the Modbus RTU protocol and describes the serial client-server
communication. Via the client, the basic settings are made and also functions are set. Also, the
circulation pump is electrically connected and it is determined which is used for the cascade.
The other controllers are called server 1, server 2 or server 3, depending how many controllers
are available.
Please note: The three-way valve for the stratification is exclusively connected electronically to
the controller of the server 1.
The controllers must be arranged from left to right in the following order: client, server 1,
server 2, server 3.
If additionally, a MB3.10 Modbus RTU module is connected, it should exclusively be connected
with the client via the bus line / communication cable. For further details, please refer to the
separate operation instructions of the MB3.10 (PAW item no. 1339002).
In the following illustration you can see an example of a 4-fold cascade. To connect the two-way
zone valves (cascade valves), the three-way valve for the improved stratification control in the
storage tank (return stratification) as well as the controller via a bus line, follow the steps in
chapter 18.1.
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