45
3.
Connect the tester (up to 5 mA) in series across
tab
B
and earth cable
A
.
■
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 46).
Draining the boiler on the DHW side
Fig. 37
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
A
(opera-
tional) to lever position
B
or
C
as required.
■
Lever position
B
: the DHW circuit in the appli-
ance
excluding
the DHW cylinder is drained via
the cold water connection.
■
Lever position
C
: the DHW circuit in the appli-
ance
and
DHW cylinder are drained via the hot
water connection. The cold water connection
remains filled.
Commissioning, inspection, maintenance
Checking the anode earth current with an anode…
(cont.)
5778741