Connecting The Low-Loss Header Sensor; Connecting The Dhw Sensor - Viessmann Vitocrossal 300 CU3A 26 Installation Instructions Manual

Control Connections

Connecting the Low-loss Header Sensor

Connecting the DHW Sensor

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Vitocrossal 300 CU3A 26 to 199 Installation
1. Connect the low-loss header sensor (if used) to
terminals X3.4/X3.5 on the boiler control board.
2. Route the sensor to the low loss header and install
into the sensor well.
Connecting DHW sensor
1. Attach the DHW sensor to the quick connect plugs
provided from the boiler control board.
Install DHW tank temperature sensor
as described in the Vitocell Installation
Instructions supplied with the DHW
storage tank.