Viessmann B2HB 45 Installation Instructions Manual page 23

Vitodens 200-W B2HB 45, 57 Installation
Connections
(continued)
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.
Boiler Connections
23