Control Sequence - Viessmann VITOTRONIC 200 Installation And Service Instructions Manual

Cylinder temperature control
The set value range can be extended to 90 °C at cod-
ing address "56" in the "DHW" group.
DHW circulation pump
This delivers hot water to the draw-off points at adjust-
able times.
Four time phases can be selected at the control unit
for every day.
Auxiliary circuits
With extension EA1:

Control sequence

Code "55:0", cylinder heating
The DHW cylinder goes cold (set value
able via coding address "59"):
■ The set boiler water temperature is set 20 K higher
than the set DHW temperature (adjustable via coding
address "60").
Note
The value set in coding address "06" in the "Boiler"
group for the maximum boiler water temperature limit
has no effect.
Pump on:
■
Starting the circulation pump for cylinder heating
–
subject to the boiler water temperature (code
"61:0").
The circulation pump starts when the boiler water
temperature is 7 K higher than the DHW tempera-
ture.
Immediate start of the circulation pump for cylinder
–
heating (code "61:1").
The DHW cylinder is hot (set value +2.5 K):
■ The set boiler water temperature is returned to the
weather-compensated set value.
■ Pump run-on:
The cylinder primary pump runs on after cylinder
heating until the following criteria are met:
– The difference between the boiler water tempera-
ture and the DHW temperature is less than 7 K.
– The weather-compensated set boiler water temper-
ature has been reached.
The set DHW temperature is exceeded by 5 K.
–
The set max. run-on time has been reached (cod-
–
ing address "62").
■ Without pump run-on (code "62:0").
Code "55:1", adaptive cylinder heating
With adaptive cylinder heating, the speed of the tem-
perature rise during DHW heating is taken into
account.
(cont.)
DHW heating can be blocked or enabled by switching
the heating program (see coding address "d5" in the
"Heating circuit..." group).
The DHW circulation pump can be controlled for a
short period via a floating contact. The time is adjusta-
ble via coding address "3d" in the "General" group.
System with solar control unit
A third set DHW temperature can be specified in cod-
ing address "67" in the "DHW" group.
The DHW cylinder is only reheated by the boiler if the
temperature falls below this value.
The DHW cylinder goes cold (set value
able via coding address "59"):
2.5 K, adjust- ■ The set boiler water temperature is set 20 K higher
−
than the set DHW temperature (adjustable via coding
address "60").
Note
The value set in coding address "06" in the "Boiler"
group for the maximum boiler water temperature limit
has no effect.
■ Pump on:
– Starting the circulation pump for cylinder heating
subject to the boiler water temperature (code
"61:0"):
The circulation pump starts when the boiler water
temperature is 7 K higher than the DHW tempera-
ture.
– Immediate start of the circulation pump for cylinder
heating (code "61:1").
The DHW cylinder is hot:
The control unit checks 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 circulation pump shutdown points to prevent the
set DHW temperature being substantially exceeded
after the cylinder has been heated up.
Function description
2.5 K, adjust-
−
83