Viessmann VITODENS 222-F Installation And Service Instructions Manual page 135

Weather-compensated control unit
The DHW is controlled to the specified
temperature via the cylinder temperature
sensor.
The primary cylinder continues to be
heated up after the draw off process has
terminated, until the set DHW tempera-
ture has been reached at the cylinder
temperature sensor.
Boosting DHW heating
The booster heating function is activated
if a switching period is selected for the
fourth time phase.
Function description
(cont.)
The cylinder primary pump and the
three-way diverter valve remain ON for a
further 30 s.
The set temperature value for the heat-
ing boost is adjustable in coding address
"58".
135