Viessmann Vitodens 222-F B2TA series, Installation And Service Instructions Manual, Page: 58 / 196

58
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.
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.
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5773 216 GB