Vitodens 200-W B2HB 19 to 35, 68 to 125 Installation
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Control Connections
Accessing the X3 Plug
1. Remove the control unit cover (see page 23).
2. Remove the X3 plug from the control board. Install
the required sensors as per instructions. Reinstall the
control cover.
1. Connect the low-loss header sensor (if LLH is used)
to terminals X3.4/X3.5 on the boiler control board.
Connecting the Low-loss Header Sensor