Venting The Heating System; Filling The Siphon With Water - Viessmann VITODENS 200-W Service Instructions Manual

Further details regarding the individual steps
3. "Time / Date"

Venting the heating system

1. Close the gas shut-off valve and
switch the control unit ON.
2. Activate venting program (see next
steps).
Note
For function and sequence of the
venting program, see page 127.
3. Check the system pressure.
Activating venting program with
weather-compensated control units:
1. Press OK and å simultaneously
for approx. 4 s.
2. "Service functions"

Filling the siphon with water

A B C
Commissioning, inspection, maintenance
(cont.)
4. Set current time and date.
3. "Venting"
4. Terminating venting program:
Press OK or ä.
Activating venting program with con-
stant temperature control units:
1. Press OK and å simultaneously
for approx. 4 s.
2. Select Ú "5" and confirm with OK.
When the venting program is activa-
ted, "EL on" is shown on the dis-
play.
3. Terminating venting program:
Press ä.
1. Remove retaining clip A and pull out
insert B.
2. Fill siphon C with water and reas-
semble.
Note
Install the supply hose the correct
way round.
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