Bleed (Vent) Air From Boiler Heat Exchanger - Viessmann VITODENS 200-W Service Instructions Manual

Start-up and Service

Bleed (Vent) Air from Boiler Heat Exchanger

Legend
BD Boiler Drain
BF Boiler Fill
BR Boiler Return
BS Boiler Supply
GC Gas Connection
PRV Pressure Relief Valve
14
Vitodens 200-W B2HA 19, 28, 35 Service
1. Connect hose to boiler filling tap and other end to
a fresh water supply (or heating medium).
2. Open fresh water supply valve and then the boiler
filling tap slowly (isolation valves must be closed
during fill/bleed process).
3. Flush boiler heat exchanger via boiler supply and
return (for at least 10 minutes.) until all air is
removed from the boiler.
4. When the drain valve begins to bleed water, close
boiler drain valve, then boiler fill valve and open
system isolation valves.
5. a. Close the gas shut-off valve and switch the
control unit ON.
b. Activate venting program (see next steps).
Note: For function and sequence of the venting
program, see page 85.
c. Check the system pressure.
6. Activating the venting program:
Service menu
- Press OK and simultaneously for approximately
4 seconds.
- "Service functions"
- "Venting"
Venting function is enabled.
Ending venting function:
- Press OK or .
7. Check system pressure.
8. Ensure adequate fuel supply exists and open gas
shutoff valve.