Viessmann Vitocal 222-G User Manual page 204

Vitocal 300-A/350-A
7.3 Vitocal 300-A, one heating circuit without mixer, two heating circuits with mixer, DHW
heating (as option with solar) and heating water buffer cylinder
ID: 4605094_1304_05
Application range
Detached house with different utilisation patterns. Different sizing of
the heating circuits. Size the DHW cylinder in accordance with current
standards and requirements.
Main components
■ Vitocal 300-A with Vitotronic 200, type WO1B
■ Heating circuit distributor with one heating circuit without mixer and
two heating circuits with mixer
■ Vitocell 100-V DHW cylinder, type CVW, 390 litres
■ Heating water buffer cylinder
Heating water buffer cylinder
The minimum flow rate of the heat pump is safeguarded via heating
water buffer cylinder zP and secondary pump 6. It is possible to use
differential pressure-dependent heating circuit pumps uZ, oZ and q-
Z.
Note
In type AWCI, circulation pump for cylinder heating 5 is replaced by
an internal and fully wired 3-way diverter valve.
Central heating by heat pump
Heat pump 1 starts when the actual temperature captured by buffer
temperature sensor zQ of heating water buffer cylinder zP falls below
the set temperature selected at control unit 2.
Control unit 2 of heat pump 1 regulates the heating water flow tem-
perature. The secondary pump 6 delivers the heating water either to
heating water buffer cylinder zP or to DHW cylinder eP. Heating circuit
pumps uZ, oZ and q-Z deliver the required water volume to the heat-
ing circuits. The flow rate in the heating circuit is regulated by opening
or closing the thermostatic radiator valves or the valves of the under-
floor heating distributor.
Required parameter settings
ID: 4605094_1304_05
Vitotronic 200, type WO1B
Parameter
7000
7A00
ID: 4605094_1304_05
Vitosolic 100, type SD1
Parameter
ANL
"RPM"
System examples
(cont.)
Value Function
10 With heating circuit A1/HC1, M2/HC2, M3/HC3, DHW cylinder
1 With Vitosolic 100, type SD1
Value Function
2 System version
"0" Pump with electronic speed control (delivered condition)
"1" Standard solar circuit pump without separate variable speed control - speed controlled by
pulse pack control
"2" Pump with PWM input (Wilo)
"3" Pump with PWM input (Grundfos)
Any heat not absorbed by the heating circuits is stored in heating water
buffer cylinder zP. This achieves a long runtime for the heat pump.
Heat pump 1 restarts when the temperature at temperature sensor
zQ of heating water buffer cylinder zP falls below the set value.
During the power-OFF period, the heating circuits will be supplied with
heat from heating water buffer cylinder zP.
The heat pump and secondary pump 6 are stopped when the tem-
perature set at the heat pump return is reached.
DHW heating by heat pump
In the delivered condition, DHW heating by heat pump 1 is given
priority over the heating circuit and takes precedence at night.
The heat demand is issued via cylinder temperature sensor eQ and
control unit 2, which controls circulation pump for cylinder heating
5 in conjunction with secondary pump 6. The control unit raises the
flow temperature to the value required for DHW heating.
DHW reheating can be provided by an electric booster heater (e.g.
immersion heater inside the DHW cylinder or instantaneous heating
water heater 4 in the flow). The control unit switches 3-way diverter
valve/pump 5 to the heating circuit when the actual temperature at
cylinder temperature sensor eQ exceeds the set value selected at the
control unit.
Instantaneous heating water heater (accessories)
The flow temperature can be raised with instantaneous heating water
heater 4 (accessories). This serves to cover peak loads, e.g. when
drying buildings or screed, or in mono energetic systems.
DHW heating with solar backup
Heat pump control unit 2 in Vitocal 300-A can be connected via KM
BUS distributor 8 to a Vitosolic 100 (type SD1) rU to achieve DHW
heating with solar backup.
Circulation pump in solar heat exchanger set eO and Solar-Divicon
rW start and DHW cylinder eP is heated up when the temperature
differential between collector temperature sensor rR and cylinder tem-
perature sensor eW exceeds the set value.
The heat pump will be locked out against cylinder heating when the
temperature at cylinder temperature sensor eQ in the DHW cylinder
exceeds the set value selected at the control unit.
The solar thermal system heats the cylinder to the set value selected
at solar control unit rU.
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VIESMANN
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