Bleed (Vent) Air From Boiler Heat Exchanger; Bleed (Vent) Air From Heating System - Viessmann VITODENS 222-F Service Instructions Manual

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Bleed (Vent) Air from Boiler Heat Exchanger

Bleed (Vent) Air from Heating System

14
Vitodens 222-F B2TA 19 and 35 Service
Note: To prevent equipment damage, do not bleed the
boiler heat exchanger via the pressure relief valve
on the heating water side.
1. Close the shut-off valves (field supplied) on the
heating water side.
2. Remove cover panel A.
3. Connect the drain hose on valve B with a drain.
Note: The drain hose is located loosely inside the heat
exchanger compartment.
4. Open air vent valve B using a key and fill via the
sediment faucet C in the heating return and vent
using mains pressure (flush) until no more air noise
can be heard.
Note: The key is supplied with the installation fittings.
5. Close valve B and fill valve C in the heating return,
and open the shut-off valves on the heating water
side.
6. Activating the venting program:
Service menu
- Press OK and simultaneously for approximately
4 seconds.
- "Service functions"
- "Venting" (bleeding)
Venting function is enabled.
Ending venting function:
- Press OK or .
1. Close the gas shut-off valve and switch the control
unit ON.
2. Activate venting program (see next steps).
- Press OK and simultaneously for approximately
4 seconds.
- "Service functions"
- "Venting"
Venting function is enabled.
Ending venting function:
- Press OK or .
3. Check the system pressure.