Selection Of Heater; 1-Phase Heater; Example For Calculation Of Charging Time - Fronius Ohmpilot Bedienungsanleitung

Selection of heater

1-phase heater

Controlled in a continuously variable manner from 0 to 3 kW
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3-phase heater: Controlled in a continuously variable manner from 0 to 9 kW.
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Example for cal- 500-litre boiler, heater can be fitted at the very bottom of the boiler,
culation of char-
temperature spread 45 - 60 °C = 15 °C;
ging time 4.5 kW heater
Possible stored energy = 500l x 1.16 kWh x 15 °C = 8.7 kWh. If the heater is fully
activated, the heating up takes approx. 2 hours (8.7 kWh / 4.5 kW)
NOTE!
Power adjustment
So that optimal use can be made of the surplus power and the hot water is
reheated quickly, the heater output should be adapted to the output of the pho-
tovoltaic system, e.g. 5 kWp => 4.5 kW heater.
0.3 to 3 kW
Purely resistive load (no electronic temperature limiters, fans, etc.)
0.9 to 9 kW
Equal load distribution on all 3 phases (e.g. 3 x 3 kW).
If a mechanical temperature switch is being used, it must switch all 3 phases
simultaneously.
Purely resistive load (no electronic temperature limiters, fans, etc.)
Neutral conductor must be implemented (this can generally also be retrofit-
ted)
L1 L2 L3
Temperature limitation
A mechanical temperature switch sim-
plifies commissioning and use. If a me-
chanical temperature switch is not
available, a temperature sensor can al-
so be connected to the Ohmpilot to li-
mit the maximum temperature. (See
chapter "Temperature limitation" on
page 2.4)
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