Viessmann VITODENS 222-F Installation Instructions Manual page 18

Boiler Connections
Connections
(continued)
18
Vitodens 222-F, B2TA 19 and 35 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.