Viessmann Vitotronic 11 CC1E, Installation And Service Instructions Manual

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The DHW cylinder goes cold (set value
–
2.5 K, adjust-
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:
Cylinder heating will start early if a lot of hot water is
drawn off. Cylinder heating will terminate early if no hot
water is drawn off.
DHW cylinder goes cold:
■ Set value
–
2.5 K, adjustable via parameter "04"
or
■ Actual DHW temperature at sensor 2 < set DHW
temperature x factor for start time (adjustment at
parameter "0E")
The DHW cylinder is hot:
■ Set value +2.5 K
and
■ Actual DHW temperature at sensor 2 > set DHW
temperature x factor for stop time (adjustment via
parameter "0D")
Parameter "00:3", Tank temperature control, tank
loading system
The DHW cylinder goes cold (set value
–
2.5 K, adjust-
able via parameter "04"):
■ The set boiler water temperature is set 20 K higher
than the set DHW temperature (adjustable via
parameter "06").
■ The primary cylinder loading pump for the cylinder
loading system switches on.
■ The 3-way mixing valve opens and then regulates to
the specified set value.
■ The circulation pump for cylinder heating cycles
(briefly switches on and off) until the set flow temper-
ature has been reached (set DHW temperature). The
circulation pump for cylinder heating then runs con-
tinuously.
If, during heating, the actual value falls below the
required set temperature, the circulation pump for
cylinder heating will temporarily cycle again.
The DHW cylinder is hot:
■ Cylinder temperature sensor 1:
Actual value
≥
set value
and
Cylinder temperature sensor 2:
Actual value > set value
−
1.5 K
■ The set boiler water temperature is returned to the
selected set value.
■ The circulation pump for cylinder heating stops
immediately when the 3-way mixing valve is fully
opened.
or
■ The circulation pump for cylinder heating stops after
expiry of the run-on time that is selected at parame-
ter "08".
Plug-in adaptor for external safety equipment (accessories)
Connecting one plug-in adaptor
The wiring centre is automatically recognised by the
control unit as a KM-BUS subscriber.
The following external safety equipment can be con-
nected to EN 12828:
■
Low water indicator
■
Maximum pressure limiter
■
Minimum pressure limiter
■
Additional high limit safety cut-out
■
External controlled burner shutdown
■
External burner demand (stage 1)
Function description
DHW heating control (cylinder temperature…
(cont.)
5863679
Functions