100
Brief description
■
The boiler water temperature is regulated by starting
and stopping the burner or through modulation.
■
The set boiler water temperature is determined from
the following parameters:
–
Set flow temperature of heating circuit 1 and the
heating circuits connected via LON
–
External demand
–
Set DHW temperature
■
The set boiler water temperature is subject to the
boiler and the heating/control versions.
The coding card specifies a minimum boiler water
temperature that must be maintained to protect the
boiler.
■
In conjunction with Therm-Control:
If the set temperature at the Therm-Control sensor is
not reached, the set boiler water temperature is
increased.
■
When the DHW cylinder is heated, a set boiler water
temperature is specified that is 20 K higher than the
set DHW temperature (adjustable at parameter "06"
in the
"DHW"
group).
Control functions
Capturing the boiler water temperature:
■
High limit safety cut-out STB (liquid expansion)
■
Temperature controller TR (liquid expansion)
■
Boiler water temperature sensor NTC 10 k
Ω
Upper control range limits
■
High limit safety cut-out STB 110/100 °C
■
Temperature controller TR 95/100/110 °C
■
Electronic maximum temperature limit:
–
Setting range: 20 to 127 °C
–
Changes at parameter "06" in the
"Boiler"
group.
Lower control range limits
■
In standard mode and when frost protection is ena-
bled, the boiler water temperature will be regulated
subject to the respective boiler.
Boiler protection function: Therm-Control (start-up control)
■
For heating systems with distributor installed close to
the boiler
■
Conditions:
The boiler water flow rate must be able to be
reduced by at least 50 % in the start-up phase (e.g.
after a weekend shutdown).
■
Also affects the heating circuits.
Function
Single boiler systems
■
The Therm-Control sensor, installed near the return
connector, captures the return temperature.
■
The burner is ramped up to full load if the factory-
selected set temperature (specified by the coding
card) is not being achieved. The flow rate is reduced
via the mixer.
■
If the set temperature is exceeded, the mixers are
opened. The flow rate is always increased to 100 %.
Multi boiler systems
■
The Therm-Control sensor, installed near the return
connector, captures the return temperature.
■
The burner is ramped up to full load if the factory-
selected set temperature (specified by the coding
card) is not being achieved. The flow rate is reduced
via the butterfly valve. Where the Therm-Control sen-
sor cannot affect the butterfly valves it must, instead,
regulate the downstream heating circuits.
■
If the set temperature is exceeded, the butterfly valve
is opened. The flow rate is always increased to
100 %.
Connection in heating systems without LON
Single boiler system
■
Plug
sÖ
A1 of the Vitotronic is used as a switching
contact for the Therm-Control.
■
Required parameter: "53:2" in the
"General"
group
Function description
Boiler water temperature control
5863679
Functions
Summary of Contents for Vitotronic 11 CC1E
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