Viessmann VITOTRONIC 300 GW2 Installation And Service Instructions Manual page 61

Mounting the Front Part of the Control Unit (CM2 only)
1. Position the front part of the housing
and clip hinges to counter-parts on
main housing.
2. Release the stay bar, open it up
and lock in position at point A.
3. Insert the flat cable from the
Optolink into plug "X20".
4. Insert the plug of the programming
unit into socket "X10". Use cable
guides in cover for routing.
5. Engage the stay bar in the front
housing.
6. Close the front of the housing.
7. Secure front housing with supplied
screws.
8. Install control cosmetic cover.
A
Installation
61