Fuses; Test Button; Adjustable High Limit - Viessmann Vitotronic 300 Installation And Service Instructions Manual

Additional information
System components
Front panel with heating circuit selector buttons, Part No. 7818 623
Fuse box, Part No. 7820 172
LON communication module, Part No. 7172 173
96
(continued)
A A
C B
A Control unit or Vitocom 300
B Connecting cable for data transfer
between the control units
(accessory)
C Terminal resistor,
Part No. 7143 497
For displaying and selecting the
heating circuit.
The fuse box contains:
Fixed high limit

Adjustable high limit

Fuses

Heating system switch

TEST button

The communication module is
A
inserted in the control unit.
Interruption of communication is
indicated.
1 terminal resistor is inserted on
each of the first and last control
units.
B C
Accessory