Venting The Heating System - Viessmann VITODENS 200-W Service Instructions Manual

Further details regarding the individual steps
4. Close valves A and B, remove the
filling equipment and open the shut-
off valves on the heating water side.

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 126.
3. Check the system pressure.
Activating the venting program with
weather-compensated control units:
1. Press OK and å simultaneously
for approx. 4 s.
2. "Service functions"
Commissioning, inspection, maintenance
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 "5" with Ú and confirm with
OK.
When the venting function is active,
"EL on" will be displayed.
3. Terminating venting program:
Press ä.
(cont.)
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