Viessmann WB2B 45 - Page 47

Control Connections
47
Electrical Connections (continued)
Accessing the X3 plug
1. Remove the control unit cover (see
page 23).
2. Remove the X3 plug from the control
board. Attach sensors and/or
KM-BUS and/or accessories and
reinsert the X3 plug. Refer to the
following sensor information.
3. Reinstall the control cover.
Connecting the low-loss header sensor
1. Connect the low-loss header sensor
(if used) to terminals X3.4/X3.5 on
the boiler control board.
5418 909 v1.6
X3
Fig. 41
1.
2.
3.
1234567 4
X3
Fig. 42
1.