Draining The Boiler On The Dhw Side - Viessmann Vitodens 222-F Installation And Service Instructions For Contractors

Commissioning, inspection, maintenance
Checking the anode connection and anode earth...
Fig. 35
1. Remove cover (two-part design up to 26 kW).
A
2. Remove earth cable
B

Draining the boiler on the DHW side

Fig. 36
46
C
from tab .
C
(cont.)
B A
3. Connect tester (up to 5 mA) in series between tab
and earth cable
C 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).
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
tional) to lever position
Lever position : the DHW circuit in the appli-
■ B
ance excluding the DHW cylinder is drained via
the cold water connection.
■ Lever position : the DHW circuit in the appli-
C
ance and DHW cylinder are drained via the hot
water connection. The cold water connection
remains filled.
.
(opera-
A
or as required.
B C