Auxiliary Circuits - Viessmann Vitotronic 200 Installation And Service Instructions For Contractors

DHW heating control (cylinder temperature...
Parameter "0B" in the "DHW" group enables the set
value of the programming unit and/or remote controls
to be assigned.
DHW circulation pump
This delivers hot water to the draw-off points at adjust-
able times.
4 time phases can be selected at the control unit for
every day.

Auxiliary circuits

DHW heating in conjunction with the heating circuits
can be disabled or enabled by changing over the oper-
ating program: See parameter "1F" in the "Heating
circuit..." group.
Control sequence
The following parameters in the "DHW" group influ-
ence the controlled sequence.
Tank heating (parameter "00:0")
The DHW cylinder goes cold (set value
able via parameter "04"):
The set boiler water temperature is set 20 K higher
■
than the set DHW temperature (adjustable via
parameter "06").
■ Pump on:
– Starting the circulation pump for cylinder heating
subject to boiler water temperature (parameter
"07:0").
The circulation pump starts when the boiler water
temperature is 7 K higher than the DHW tempera-
ture.
– Starting the circulation pump for cylinder heating
immediately (parameter "07:1").
The DHW cylinder is hot (set value +2.5 K):
The set boiler water temperature is reset to the
■
weather-compensated set value.
■ With pump run-on:
The circulation pump runs on after cylinder heating
until one of the following criteria is met:
– The differential 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 is reached (parameter
"08").
■ Without pump run-on (parameter "08:0").
(cont.)
System with cylinder loading system
The above functions also apply in conjunction with cyl-
inder loading systems.
Set the following parameters:
"00:3" in the "DHW" group; "53:1", "55:2" in the "Gen-
eral" group.
System with solar control unit
A 3rd set DHW temperature can be assigned at
parameter "0C" in the "DHW" group.
The DHW cylinder is only reheated by the boiler if the
temperature falls below this value.
Adaptive cylinder heating enabled (parameter
"00:1")
With adaptive cylinder heating, the speed of the tem-
perature rise during DHW heating is taken into
2.5 K, adjust- account.
–
The DHW cylinder goes cold (set value
able via parameter "04"):
The set boiler water temperature is set 20 K higher
■
than the set DHW temperature (adjustable via
parameter "06").
■ Pump on:
– Starting the circulation pump for cylinder heating
subject to boiler water temperature (parameter
"07:0").
The circulation pump starts when the boiler water
temperature is 7 K higher than the DHW tempera-
ture.
– Starting the circulation pump for cylinder heating
immediately (parameter "07:1").
The DHW cylinder is hot:
■ The control unit checks whether the boiler will still be
required to supply heating energy 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 stop times to prevent the set
DHW temperature being substantially exceeded after
the cylinder has been heated up.
Tank temperature control with 2 temperature sen-
sors (parameter "00:2")
Cylinder temperature sensor 1 enables the circulation
pump for cylinder heating and is evaluated for stop
conditions during the pump run-on time.
Cylinder temperature sensor 2:
Function description
2.5 K, adjust-
–
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