4.6 Vitocal 300-G/350-G, one heating circuit without mixer, one heating circuit with mixer,
DHW heating and heating water buffer cylinder
ID: 4605354_1304_03
Application range
Detached house and apartment building with two heating circuits with
different design layouts. Size DHW cylinder
eP
in accordance with
current standards and requirements.
Main components
■ Vitocal 300-G/350-G, type BW or BWC, up to 18.7 KW
■ Vitotronic 200, type WO1B
■ Heating circuit distributor with one heating circuit without mixer and
one heating circuit with mixer
■ DHW cylinder
■ Heating water buffer cylinder
Heating water buffer cylinder
The minimum flow rate of heat pump
1
is safeguarded via heating
water buffer cylinder
zP
and secondary pump
6
. It is possible to use
differential pressure-dependent heating circuit pumps
uZ
and
oZ
.
Central heating by heat pump
Heat pump
1
, primary pump
5
and secondary pump
6
start when
the actual temperature captured by cylinder temperature sensor
zQ
of
heating water buffer cylinder
zP
falls below the set temperature selec-
ted at control unit
2
.
Control unit 2 regulates the heating water flow temperature. With
type BW heat pumps, secondary pump
6
delivers heating water sub-
ject to demand to heating water buffer cylinder
zP
, or via circulation
pump for cylinder heating
7
to DHW cylinder
eP
.
With type BWC heat pumps, integral secondary pump
6
or the cir-
culation pump for cylinder heating delivers heating water
7
either to
heating water buffer cylinder
zP
or to DHW cylinder
eP
.
To balance the difference in energy between the primary and secon-
dary circuits, operate heating water buffer cylinder
zP
in parallel to the
heating circuits. Any heat not absorbed by the heating circuits is stored
in heating water buffer cylinder
zP
. In addition, heat pump
1
achieves
longer runtimes, and the heating circuits are supplied with heat from
heating water buffer cylinder
zP
during power-OFF periods.
DHW heating by heat pump
In the delivered condition, DHW heating by heat pump
1
is given
priority over the heating circuits and takes precedence at night.
With BW type heat pumps, the heat demand is issued via cylinder
temperature sensor
eW
and control unit
2
, which controls circulation
pump for cylinder heating
7
. Heat pump
1
raises the flow temper-
ature to the value required for DHW heating.
With type BWC, the demand is issued via cylinder temperature sensor
eW
and control unit
2
, which controls integral circulation pump for
cylinder heating
7
.
The flow temperature can be raised above 60 °C with instantaneous
heating water heater
4
.
Required parameter settings
ID: 4605354_1304_03
Parameter Value Function
7000 6 With heating circuit A1/HC1, M2/HC2, DHW cylinder
Vitocal 300-G/350-G
(cont.)
100
VIESMANN
System examples
4
5822 472 GB
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