Viessmann VITOTRONIC 100 Installation And Service Instructions Manual page 125

Cylinder temperature control
Control sequence
H The cylinder primary pump runs on
after cylinder heating, until
the difference between the boiler
water and the DHW temperature
is less than 7 K or
the weather−compensated set
flow temperature has been
reached or
the actual temperature is 5 K
higher than the set DHW
temperature or
the maximum run−on time
(adjustable via coding
address "62") has been reached.
H Without the cylinder primary pump
running on
(code "62:0")
Code "55:0"
Cylinder heating
DHW cylinder goes cold
(set value 2.5 K, adjustable via
coding address "59")
The set boiler water temperature is
adjusted 20 K higher than the set
DHW temperature (adjustable via
coding address "60").
H Starting the cylinder primary pump
subject to boiler water temperature
(code "61:0"):
The pump starts when the boiler
water temperature is 7 K higher
than the DHW temperature.
H Immediate start of the cylinder
primary pump (code "61:1").
(only for single boiler systems) (cont.)
The DHW cylinder is hot
(set value +2.5 K)
The set boiler water temperature is
returned to the programmed set
value.
Code "55:1":
Adaptive cylinder heating
With adaptive cylinder heating, the
speed of the temperature rise during
DHW heating is taken into account.
Also taken into account is the
question of whether the boiler will
be required to supply heat after the
cylinder has been heated up or
whether residual boiler heat should
be transferred to the DHW cylinder.
Accordingly, the control unit
determines the burner and pump
shutdown points to prevent the set
DHW temperature being
substantially exceeded after the
cylinder has been heated up.
Function description
125