Viessmann B2TF Installation And Service Instructions Manual page 51

Draining the boiler on the DHW side
Fig. 42
Cleaning the loading cylinder
Note
According to EN 806, a visual inspection and (if neces-
sary) cleaning must be carried out no later than 2
years after commissioning, and as required thereafter.
A C
B
Commissioning, inspection, maintenance
(cont.)
2. Connect the hose to the drain valve and route it
into a suitable container or drain outlet.
Note
Ensure adequate ventilation in the DHW pipework.
3. Turn the drain valve from lever position
tional) to lever position
■ Lever position : The DHW circuit in the appli-
B
ance excluding the DHW cylinder is drained via
the cold water connection.
■ Lever position C : The DHW circuit in the appli-
ance and the DHW cylinder are drained via the
hot water connection.
The cold water connection remains filled.
(opera-
A
or as required.
B C
51