Sequence - Viessmann Vitotronic 300 GW6B Installation Instructions Manual

Electrical Connections
Blocking the Boiler Externally/Adding to the Boiler Sequence
Legend
A Blocking the boiler externally
B Start the boiler externally as the last one
in the boiler sequence
Contact Closed
H The boiler is blocked and has been removed
A
aVD.1/aVD.2
H The motorized isolation valve closes and the
H The other boilers provide the required heating.
Note: If all boilers are blocked or there is no
This boiler is moved from the current position
B
in the boiler sequence and started as the last
aVD.2/aVD.3
boiler in the sequence.
40
from the boiler sequence.
boiler circuit pump stops.
other boiler ready for operation, then
there will be no frost protection for the
heating system.
Vitotronic 300, GW6B Installation and Service
Only for lag boilers
Connection on plug aVD
Note: 'Live' contacts lead to short circuits or phase failure.
The external connection must be potential-free.
Open
The boiler is integrated into the current boiler

sequence.

The boiler is integrated into the current boiler
sequence.