Corrective Action - Viessmann VITODENS 222-F Service Instructions Manual

Vitodens 222-F B2TB 19 and 35 Service

Corrective Action

Putting control unit in maintenance position
If required for commissioning and servicing, the control
unit can be put in a different position.
Draining the boiler on the heating water side
1. Close the shut-off valves on the heating water side.
2. Connect the drain hose on valve into a suitable
container or drain outlet.
Note: The drain hose is located loosely inside the heat
exchanger compartment. On later models there
will be a factory installed sediment valve A
and the drain hose will be field supplied.
3. Open drain valve with a key and drain the boiler as
much as required.
Note: The key is supplied with the installation fittings.
There is a factory installed sediment valve A
and the key will be required for air bleed (see
page 14).
Troubleshooting
77