Accessing The Control Unit Connections - Viessmann B2HB 45 Installation Instructions Manual

Boiler Connections
Connections
(continued)
22
Vitodens 200-W B2HB 45, 57 Installation

Accessing the control unit connections

1. Remove both screws from the junction box cover
and set screws aside.
2. Loosen both retaining screws as shown (do not
remove).
3. Pull the external accessory connection box forward
until the retaining screws are clear of the guides (built
into the rails).
4. Swing the external accessory connection box down.