Draining The Boiler On The Dhw Side; Cleaning The Dhw Storage Tank - Viessmann VITODENS 222-F Service Instructions Manual

Service

Draining the Boiler on the DHW Side

Cleaning the DHW Storage Tank

24
Vitodens 222-F B2TB 19 and 35 Service
1. Connect hose to drain valve and route into a suitable
container or drain outlet.
Note: Ensure adequate ventilation in the DHW pipework.
2. Turn drain valve from lever position A to lever
position B or C as required.
H Lever position B: Drain drinking water circuit in
appliance excluding DHW tank via the cold water
connection.
H Lever position C: Drain potable water circuit
in appliance and DHW tank via the hot water
connection. Cold water connection remains filled.
1. Drain the DHW storage tank.
2. Remove insulation A.
3. Disconnect the DHW piping from the pipe work to
prevent contamination from entering the pipe system.
4. Remove tank clean out cover B.
5. Remove loose deposits with a high pressure cleaner.
Note: When cleaning the inside, only use plastic
cleaning utensils.
6. Use a chemical cleaning agent to remove hard
deposits that cannot be removed by a high pressure
cleaner.
Note: Never use hydrochloric acid based cleaning
agents.
7. Thoroughly flush the DHW tank after cleaning.
8. Reinstall in reverse order.
Note: Visual inspection and (if necessary) cleaning
must be carried out no later than two years after
commissioning and thereafter as required.