Viessmann B2TF Installation And Service Instructions Manual page 50

Commissioning, inspection, maintenance
Checking anode connection and anode earth current with anode tester
Check that the earth cable is connected to the protec-
tive magnesium anode.
Note
We recommend checking the function of the protective
magnesium anode annually. This function test can be
carried out without interrupting operation, by measur-
ing the earth current with an anode tester.
A
Fig. 41
1. Remove cover (two-part design up to 26 kW).
A
2. Remove earth cable
B
Draining the boiler on the DHW side
50
C B
from tab .
C
3. Connect tester (up to 5 mA) in series between tab
C and earth cable B
■ If the current measures > 0.3 mA the protective
magnesium anode is OK.
■ If the current measures < 0.3 mA or if there is no
current at all, inspect the protective magnesium
anode visually (see page 52).
1. Shut off the DHW supply upstream of the appli-
ance.
.