46
B A
C
Fig. 35
1.
Remove cover
A
(two-part design up to 26 kW).
2.
Remove earth cable
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 magnesium
anode is OK.
■
If the current measures < 0.3 mA or if there is no
current at all, inspect the magnesium anode visu-
ally (see page 47).
Draining the boiler on the DHW side
Fig. 36
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 connection and anode earth…
(cont.)
5789 302 GB
Summary of Contents for B2TB
Page 6: ...6 15 Keyword index 152 Index Index cont 5789 302 GB ...
Page 117: ...117 Parts lists Hydraulics 5789 302 GB Components ...
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