Viessmann Vitodens 200-W B2HA 112 Installation Instructions Manual page 26

Boiler Connections
Connections
(continued)
24
Vitodens 200-W B2HA 112, 150, 399, 530 Installation
5. Tilt the bottom of the external accessory connection
box cover forward.
6. Pull the cover up to clear the locating pins and out
to remove, then set aside.
7. Slide both sides of the programming unit cover closed.
8. Release the hinged hooks located on both sides of
the control unit.
9. To open hinged cover, lift cover and then fold down
the control unit.
10. Release locking tabs as shown.
11. Remove cover.