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 B2TB 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 one end of the supplied drain hose to the
boiler heat exchanger air vent valve B and route the
other end to the drain system.
Note: The drain hose is located loosely inside the heat
exchanger compartment.
4. Open air vent valve B using the supplied 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.