Viessmann VITODENS 111-W Installation And Service Instructions Manual page 52

Control unit
Functions and operating conditions in...
The cylinder loading pump is switched ON if the
■
boiler water temperature
■ The burner is switched ON if the boiler water temper-
ature set cylinder temperature, and the cylinder
≤
loading pump is switched ON when the required
boiler water temperature is reached.
52
set cylinder temperature.
≥
(cont.)
DHW is regulated to the set temperature via the outlet
temperature sensor.
After the draw-off process has ended, the loading cyl-
inder continues to be heated up until the set DHW tem-
perature is reached at the cylinder temperature sensor.