Checking And Replacing The Impressed Current Anode (If Required); Returning The Dhw Cylinder Into Use; Checking The Diaphragm Expansion Vessel And Heating Circuit Pressure - Viessmann VITODENS 343-F WS4A Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps
Checking and replacing the impressed current anode (if
required)
1. Check impressed current anode G
for damage (see page 41).
2. If required, remove impressed cur-
rent anode G from flange lid E
and fit a new electrode.

Returning the DHW cylinder into use

1. Insert new gasket F under flange
lid E (see page 41).
2. Fit flange lid E and tighten the
screws with a maximum torque of
25 Nm.
!
Please note
To safeguard the protective
effect ensure during installa-
tion, that impressed current
anode G has no contact
with the internal indirect coil.
After the installation, check
the resistance between
cable C and anode con-
nection D
must go towards infinity.
Checking the diaphragm expansion vessel and heating cir-
cuit pressure
Note
Carry out this test on a cold system.
42
3. Bend impressed current anode G
in accordance with the pattern of
the old electrode.
3. Push cable C onto anode connec-
tion D.
4. Open the on-site shut-off valve and
check for leaks.
5. Install thermal insulation hood B.
the resistance
1. Drain the system or close the cap
valve on the diaphragm expansion
vessel and reduce the pressure
until the pressure gauge indicates
"0".
(cont.)