Venting The Boiler; Venting The Heating System - Viessmann VITODENS 200-W WB2B Service Instructions For Contractors

Further details regarding the individual steps

Venting the boiler

Venting the heating system

1. Close the gas shut-off valve and
switch ON the control unit ON/OFF
switch.
Commissioning, inspection, maintenance
(cont.)
1. Close shut-off valves A and B.
2. Connect the drain hose to drain
valve C.
Connect the fill hose to boiler fill &
drain valve F (if no longer con-
nected).
3. Close shut-off valve D.
4. Open valve F.
5. Vent the first indirect coil through
shut-off valve E at mains pressure
until no more air noise is audible.
6. Close shut-off valve E and open
shut-off valve D.
7. Vent the second indirect coil
through shut-off valve D at mains
pressure until no more air noise is
audible.
8. Close valves C and F.
9. Open shut-off valve E.
Note
Shut-off valves
open to enable the boiler to oper-
ate.
and must be
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