Draining The Boiler On The Dhw Side - Viessmann Vitodens 222-F B2TA Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps

Draining the boiler on the DHW side

1. Connect hose to drain valve and
route into a suitable container or drain
outlet.
Note
Ensure adequate ventilation in the
DHW pipework.
58
(cont.)
2. Turn drain valve from lever position
A (operational) to lever position B
or C as required.
■ Lever position B: Drain drinking
water circuit in appliance exclud-
ing DHW cylinder via the cold
water connection.
■ Lever position C: Drain drinking
water circuit in appliance and DHW
cylinder via the DHW connection.
The cold water connection remains
filled.