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

Troubleshooting

Maintenance

Putting the control unit into the service position

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

Draining the boiler on the heating water side

!
Please note
Risk of scalding
Residual water will escape when the boiler or
one of the following components is fitted or
removed:
■ Water-filled pipework
■ Circulation pumps
Plate heat exchanger
■
Components fitted in the heating water or
■
DHW circuit.
Water ingress can result in damage to other
components.
Protect the following components against
ingress of water:
Control unit (in particular in the service posi-
■
tion)
■ Electrical components
■ Plug-in connections
■ Cables and leads
Only drain the boiler or heating system when the
boiler water or cylinder temperature has drop-
ped below 40 °C.
96
2.
3.
1.