Viessmann FB2B Installation And Service Instructions Manual page 44

Commissioning, inspection, maintenance
Further details regarding the individual steps
1. Remove cover A.
2. Pull earth lead B from tab C.
44
(cont.)
B C A
3. Connect the tester (up to 5 mA) in
series between tab C and earth
cable B.
■ The anode is OK if the indicated
current is > 0.3 mA.
■ Visually inspect the anode if the
current measures < 0.3 mA, or if
there is no current at all (see
page 47).