Viessmann B2HA 80 - Accessing the X3 Plug; Connecting the Low-Loss Header Sensor

Vitodens 200-W B2HA 80 to 100, 285 to 352 Installation
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Accessing the X3 Plug
Control Connections
1. Remove the control unit cover (see page 23).
2. Remove the X3 plug from the control board. Install
the required sensors as per installation instructions.
3. Reinstall the control cover.
1. Connect the low-loss header sensor (if used) to
terminals X3.4/X3.5 on the boiler control board.
Connecting the Low-loss Header Sensor