Viessmann B2TF - Draining the Boiler on the Heating Water Side

97
Draining the boiler on the heating water side
A
Fig. 51
1. Close the shut-off valves on the heating water side.
2.
Connect hose to air vent valve
A
and route it into
a suitable container or drain outlet.
3. By means of an actuator test, move the 3-way
valve to its centre position.
4.
Open air vent valve
A
and drain the boiler as
much as required.
Troubleshooting
Repairs (cont.)
6151778
Service