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

Further details regarding the individual steps

Venting the boiler

B

Venting the heating system

1. Close the gas shut-off valve and
switch ON the control unit ON/OFF
switch.
2. Activate the venting program via cod-
ing address "2F:1".
Note
To call up code 1 and for setting the
coding address, see page 38.
For function and sequence of the
venting program, see page 99.
Whilst the venting program runs, the
display shows "EL" (constant tem-
perature control unit) or "Entlüf-
tung" (Venting) (weather-compen-
sated control unit).
Commissioning, inspection, maintenance
1. Close the shut-off valves on the heat-
ing water side.
2. Connect the drain hose at the boiler
fill & drain valve B (on the connec-
tion set, accessories or on-site).
3. Open valves A and B and vent
using mains pressure until no more
air noise is audible.
A
4. Close valves A and B and open
the heating water shut-off valves.
3. Check the system pressure.
(cont.)
9