Viessmann Vitocal 222-G User Manual page 48

Vitocal 200-G
(cont.)
3.2 Vitocal 200-G, with one heating circuit without mixer, with DHW heating
ID: 4605405_1304_03
Application range
Detached house with underfloor heating system.
Main components
■ Vitocal 200-G with Vitotronic 200, type WO1B
■ Heating circuit without mixer
■ DHW cylinder
Central heating with the heat pump
Systems with large volumes, e.g. underfloor heating systems, will not
necessarily require a heating water buffer cylinder. In these heating
systems, install an overflow valve on the underfloor heating system's
heating circuit distributor that is furthest away from the heat pump.
This safeguards a minimum volume of circulating water, even in sealed
heating circuits.
The compressor, primary pump qT and secondary pump 6 or circu-
lation pump for cylinder heating 7 start if the actual temperature cap-
tured by the return temperature sensor in the secondary circuit is lower
than the temperature set at the control unit, or for DHW heating through
the heat pump.
Required parameter settings
ID: 4605405_1304_03
Parameter
7000
System examples
Value Function
2 With heating circuit A1/HC1, DHW cylinder (delivered condition)
Secondary pump 6 transports the heating water to heating cir-
cuit oP. Circulation pump for cylinder heating 7 pumps the heating
water to DHW cylinder eP.
If required, the flow temperature is raised by means of instantaneous
heating water heater 4 (accessories). This covers peak heat loads.
Opening and closing the valves of the underfloor heating distributor
regulates the flow rate within the heating circuit. Provide a bypass
valve (overflow valve) oW at the end of the last heating line to ensure
the constant flow through the heat pump circuit.
Equip underfloor heating circuits with a temperature limiter oE (acces-
sories) to limit the maximum temperature.
Heat pump 1 and primary pump qT are stopped if the temperature
at the return temperature sensor exceeds that set at the control unit.
DHW heating by heat pump
In the delivered condition, DHW heating by heat pump 1 is given
priority over the heating circuit and should ideally take place during the
night.
The heat demand is issued via the cylinder temperature sensor and
control unit, which controls circulation pump for cylinder heating 7.
The heat pump raises the flow temperature to the value required for
DHW heating. DHW heating is terminated when the actual value at the
cylinder temperature sensor exceeds the value selected at the control
unit.
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VIESMANN
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