Viessmann Vitocal 200-A - Page 90

4.5 Vitocal 300-G/350-G, with one heating circuit without mixer, with DHW heating
ID: 4605353_1304_03
Application range
Detached house with underfloor heating circuit
oP
. 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
■ DHW cylinder
Requirements
The minimum flow rate of heat pump
1
must be safeguarded by sec-
ondary pump
6
and overflow valve
oW
. Heating circuit
oP
and over-
flow valve
oW
must be matched up.
Central heating by heat pump
Heat pump
1
, primary pump
5
and secondary pump
6
start if the
actual return temperature is lower than the set temperature selected
at control unit
2
.
Heat pump 1 supplies heating circuit oP with heat. Control unit 2
regulates the flow temperature of heating circuit
oP
. With type BW heat
pumps, secondary pump
6
delivers heating water subject to demand
to heating circuit
oP
, or via circulation pump for cylinder heating
7
to
DHW cylinder
eP
.
With type BWC heat pumps, the integral secondary pump or circulation
pump for cylinder heating
7
delivers heating water either to heating
circuit
oP
or to DHW cylinder
eP
.
Heat pump
1
and primary pump
5
are switched off once the actual
return temperature at the return temperature sensor exceeds the tem-
perature set at control unit
2
.
DHW heating by heat pump
In the delivered condition, DHW heating by heat pump
1
is given
priority over heating circuit
oP
and takes precedence at night.
The heat demand is issued via cylinder temperature sensor
eW
and
control unit
2
, which controls circulation pump for cylinder heating
7
. Control unit
2
raises the flow temperature to the value required
for DHW heating.
A booster heater can back up the DHW heating function. If the set
cylinder temperature selected at control unit
2
is exceeded, control
unit
2
switches circulation pump for cylinder heating
7
off and starts
secondary pump
6
in the case of heat demand from heating circuit
oP
. Heating circuit
oP
is then supplied with heat.
The flow temperature can be raised above 60 °C with instantaneous
heating water heater
4
.
Required parameter settings
ID: 4605353_1304_03
Parameter Value Function
7000 2 With heating circuit A1/HC1, DHW cylinder (delivered condition)
Vitocal 300-G/350-G
(cont.)
System examples
VIESMANN
95
5822 472 GB
4