Fronius PVI1903OHM Operating Instructions Manual page 92

(3)
(4)
(5)
(6)
NOTE!
Relay contacts can oxidize.
The voltage must be at least 15 V and the current at least 2 mA, so that the relay conta-
cts do not oxidise.
(7)
(8)
(9)
(10)
The Fronius Smart Meter records the current power at the feed-in point and transfers the
data to the Datamanager. By controlling the Ohmpilot, the Datamanager adjusts any sur-
plus energy that is available to zero. In detail, this takes place by continuously adjusting
the heating element connected to the Ohmpilot and by targeted switching on of the heat
pump.
For activation, the heat pump must have a control input (e.g. SG Ready or DSO release).
For example, the heat pump can be switched from operating state 2 (normal operation)
to operating state 3 (increased operation) as a result of activation of heat pump input 2
by the relay. The heat pump can also be switched from operating state 1 (blocked time
set by DSO) to operating state 2 (normal operation) as a result of activation of heat pump
input 1 by the relay.
A description and list of SG Ready heat pumps can be found at:
pumpe.de/normen-technik/sg-ready/sg-ready-datenbank/
Relatively small surpluses are consumed using the heating element in a continuously
variable manner. From a certain surplus power, it makes sense to activate the heat
pump, as it is more efficient (e.g. COP (Coefficient of Performance) for hot water prepa-
ration up to 53 °C = 2.5).
The optimal switching thresholds depend on:
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If no temperature sensor is fitted, the heat pump must be used to ensure the minimum
temperature is met. As an alternative, the Ohmpilot can also ensure the minimum tempe-
rature by activating the heat pump. This may result in electricity being sourced from the
grid. The maximum temperature must be set on the heating element thermostat and on
the heat pump. If the heating element does not have a thermostat, the Ohmpilot can also
carry out this task as an alternative (see Chapter
This function can also be combined with a 3-phase heating element..
92
OUTPUT up to 3 kW variable, max. 13 A resistive load, spring balancer 1.5 - 2.5
mm²
Hot water boiler
Temperature sensor PT1000
Heat pump with SG Ready control input
Heating element (max. 3 kW)
Residual current circuit breaker
Automatic circuit breaker max. B16A
Ferrite (included in scope of supply)
Heat pump COP. The higher the temperature to which the hot water is heated, the
lower the COP.
The electrical heat pump output.
Feed-in tariff and the costs for purchasing electricity.
Reduction of the heat pump's start-up cycles = increase in service life of the heat
pump.
Thermal losses from the heat pump and the pipes.
http://www.waerme-
Optional settings on page 112).