Draining The Boiler On The Dhw Side - Viessmann Vitodens 242-F Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Testing the anode earth current with an anode...
3. Connect tester (up to 5 mA) in series between tab
C and earth cable B
■ If the current measures
OK.
If the current measures < 0.3 mA or if there is no
■
current at all, inspect the anode visually (see
page 55).

Draining the boiler on the DHW side

Fig. 46
54
.
0.3 mA the anode is
>
(cont.)
1. 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.
2. Turn drain valve from lever position
position or as required.
B C
■ Lever position B : To drain the heating system
but not the cylinder via the cold water connection.
■ Lever position : To drain the heating system
C
and the cylinder via the hot water connection.
Cold water connection remains filled.
to lever
A