Viessmann Vitocal 222-G User Manual page 100

Vitocal 300-G/350-G
4.7 Vitocal 300-G/350-G, two-stage, one heating circuit without mixer, one heating circuit
with mixer, DHW heating, heating water buffer cylinder and active cooling function via
AC-Box (2-pipe version), with cooling convector
Note
Only for 2 heat pumps with the same performance and a total output (stage 1 + stage 2) of up to 17 kW.
ID: 4605355_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. Cooling via a separate cooling
circuit e.g. in conjunction with cooling convectors iW.
Main components
■ Vitocal 300-G/350-G, type BW (up to 8 kW)
■ Vitocal 300-G/350-G, type BWS (up to 8 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
■ AC-Box (active cooling)
■ Separate cooling circuit
Heating water buffer cylinder
The minimum flow rate of heat pump stages 1/9 is safeguarded via
heating water buffer cylinder zP and secondary pumps 6/qP. It is
possible to use differential pressure-dependent heating circuit pumps
uZ and oZ.
Central heating by heat pump
Heat pump stage 1 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 tem-
perature selected at control unit 2.
If the output of stage 1 is insufficient, i.e. the integral derived from the
duration and amount of the deviation between the set and actual val-
ues of the flow temperature exceeds the set value selected at control
unit 2, then heat pump stage 2 9 plus primary pump wT and sec-
ondary pump qP are also started to raise the heating output.
Required parameter settings
ID: 4605355_1304_03
Parameter Value
7000 6
71FE 1
7100 3
7101 4
7103 100
7104 50
7111 4
5030 according to type plate
5130 according to type plate
5112 1
System examples
(cont.)
Function
With heating circuit A1/HC1, M2/HC2, DHW cylinder
Enable active cooling
Active cooling
Cooling via separate cooling circuit
Min. flow temperature cooling (delivered condition)
Influence room temperature hook-up cooling circuit
Cooling curve slope
Rated heating output, heat pump stage 1
Rated heating output, heat pump stage 2
Enable DHW heating, heat pump stage 2
Control unit 2 regulates the heating water flow temperature. Subject
to demand, secondary pumps 6/qP deliver heating water to heating
water buffer cylinder zP, or via circulation pumps for cylinder heating
7/qQ to DHW cylinder eP.
Heating circuit pumps uZ and oZ deliver the required water volume to
the heating circuits. The flow rate in the heating circuit is regulated by
opening or closing the thermostatic radiator valves or the valves of the
underfloor heating distributor.
To balance the difference in water volume between the primary and
secondary circuits, operate the heating water buffer cylinder in parallel
to the heating circuits. Any heat not absorbed by the heating circuits
is stored in the heating water buffer cylinder. In addition, heat pump
1 achieves longer runtimes, and the heating circuits are supplied with
heat from the heating water buffer cylinder during power-OFF peri-
ods.
Both stages 1/9 of the heat pump will restart when the temperature
at temperature sensor zQ in the heating water buffer cylinder falls
below the set value.
DHW heating by heat pump
Subject to demand, DHW can be heated either with only stage 1 1
or with both stages 1/9.
In the delivered condition, DHW heating by the heat pump is given
priority over the heating circuits and takes precedence at night.
The heat demand is issued via cylinder temperature sensor eW and
control unit 2, which controls circulation pumps for cylinder heating
7/qQ. The control unit raises the flow temperature to the value
required for DHW heating.
The flow temperature can be raised above 65 °C with instantaneous
heating water heater 4.
Active cooling function via AC-Box
The building can be cooled with heat pump stages 1/9 in conjunc-
tion with AC-Box iP (accessories). The natural cooling function is
enabled by control unit 2 for the cooling circuit as soon as the thresh-
old temperature (cooling limit temperature) that can be selected at
control unit 2 is exceeded. The valves in the AC-Box are set to natural
cooling. Heat is extracted from the cooling circuit and transferred to
the ground. If the cooling capacity is insufficient, the internal valves in
the AC-Box are set to active cooling and, subject to cooling demand,
the required stages start. This causes heat to be extracted from cooling
circuit iQ, and transferred via heat pump stages 1/9 to consumer
groups eP, zP, uP and oP. If there is no consumer demand, the heat
is transferred to the ground via probe wU.
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VIESMANN
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