Viessmann Vitocrossal 300 CU3A Application Manual page 19

Wiring a Mixing Valve Extension Module
Product Information
Comm. Bus
On Boiler
Supply
Sensor
Mixing
Module
Pump
Power
Notes/Comments
1.
When multiple 145 communication
accessories are being installed, 145
cables will need to be run from device to
device. (Daisy Chain)
2. Ensure to set the S1 switch to assign
the mixing valve heating circuit.
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