Putting The Control Unit Into The Service Position; Drain Boiler On The Heating Water Side - Viessmann Vitodens 222-F Installation And Service Instructions For Contractors

Troubleshooting
Maintenance
(cont.)

Putting the control unit into the service position

If required for commissioning and servicing, the control
unit can be put in a different position.
Fig. 54

Drain boiler on the heating water side

Fig. 55
1. Close the shut-off valves on the heating water side.
2. Route hose at drain valve
tainer or drain outlet.
90
2.
3.
into a suitable con-
A
1.
3. Open drain valve and drain the boiler the
A
graphic not in this document setas much as
required.