Tubra –eTherm in Combination with the Ohmpilot
G B R
9 10
1 3 5 7
2 4 6 8
12345
LAN
L2 L2L3 N N L3 N
L1
11
6
RS485
PT1000
D+D- -
R2
R3
NC W NO OUT
2
1
3
N
4
11
12
5
6
8
42,0410,0166,EN 004-08052018
7
12
INPUT - grid supply 1x 230 V Spring
1
balancer 1.5 - 2.5 mm2
NOTE! Phase and neutral conductors must not be mixed up.
Residual current-operated circuit
breaker is triggered.
External source (e.g. gas-red
7
heating)
Tubra-eTherm (9 kW)
8
EN
Functional
Description
OUTPUT - L2 Heating Element
2
OUTPUT - L3 Heating Element
3
OUTPUT up to 3 kW variable max.
4
13 A resistive load
Spring balancer 1.5 - 2.5 mm
Hot water boiler
5
PT1000 temperature sensor
6
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 surplus energy that is available to zero. In detail, this takes place by continuously adjusting
the heating circuit tubra® - eTherm connected to the Ohmpilot.
That means that surplus energy is continuously consumed by the installed tubra®eTherm heating element. Depending on the excess power, the individual phases are
switched on or off and L1 consumes the remaining power.
2
Residual-current circuit breaker
9
Circuit breaker max. B16A
10
Ferrite (included in delivery)
11
Water supply to the boiler for
12
stratication
Tubra®-eTherm heats the water in a pipe system by circulating it, so that the water
can ow into the boiler at the target temperature. Thus, straightforward stratication is
achieved. Even when a low amount of energy is available, the water temperature can be
managed. Further details can be found in the Tubra®-eTherm data sheet.
If no temperature sensor is installed, an external source (e.g. a gas boiler) must provide
the minimum temperature.
As an alternative, the Ohmpilot can also control the minimum temperature. To do this, a
temperature sensor must be connected so that the Ohmpilot can measure the temperature. This may result in electricity being sourced from the grid.
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