Operating instructions Fronius Ohmpilot

In addition to the operating instructions, all applicable local regulations regarding accident prevention and environmental protection must also be followed.

Any safety devices that are not fully functional must be repaired by an authorized specialist before the device is switched on.

Never bypass or disable safety devices.

For the location of the safety and danger notices on the device, refer to the chapter headed "Information on the device" in the operating instructions for your device.

Any equipment malfunctions which impair safety must be remedied before the device is turned on.

In certain cases, even though a device complies with the standard limit values for emissions, it may affect the application area for which it was designed (e.g., when there is equipment that is susceptible to interference at the same location or if the site where the device is installed is close to either radio or television receivers). If this is the case, the operator is obliged to take action to rectify the situation.

Copyright of these operating instructions remains with the manufacturer.

Text and illustrations were accurate at the time of printing, subject to change.
We are grateful for suggestions for improvement and information on any discrepancies in the operating instructions.

The conventions regarding how information is presented in the document, which are set out below, have been defined in order to increase the readability and comprehensibility of the document.

Application notes

IMPORTANT! Indicates application notes and other useful information. It does not indicate a harmful or dangerous situation.

Software

Software functions and elements of a graphical user interface (e.g., buttons, menu items) are highlighted in the text with this mark up.

Example: Click Save.

Instructions for action

The conventions regarding how information is presented in the document, which are set out below, have been defined in order to increase the readability and comprehensibility of the document.

Application notes

IMPORTANT! Indicates application notes and other useful information. It does not indicate a harmful or dangerous situation.

Software

Software functions and elements of a graphical user interface (e.g., buttons, menu items) are highlighted in the text with this mark up.

Example: Click Save.

Instructions for action

The Fronius Ohmpilot is an addition to the Fronius product portfolio in the field of energy management. The device controls the heating of hot water using surplus energy from a photovoltaic system. Any other use is considered improper.

The information contained in these operating instructions is intended only for qualified personnel. An electric shock can be fatal. Do not carry out any actions other than those described in the documentation. This also applies to qualified personnel.

All cables must be secured, undamaged, insulated, and adequately dimensioned. Loose connections, damaged or under-dimensioned cables must be repaired immediately by an authorized specialist company.

Maintenance and repair work must only be carried out by an authorized specialist company.

It is impossible to guarantee that third-party parts are designed and manufactured to meet the demands made on them, or that they satisfy safety requirements. Only use original spare parts.

Do not carry out any alterations, installations, or modifications to the device without first obtaining the manufacturer's permission.

Replace any damaged components or have them replaced immediately.

To operate the Ohmpilot, a Fronius Smart Meter is required to measure the surplus energy. On the user interface of the inverter, it is necessary to set whether the Fronius Smart Meter is installed at the feed-in point or in the consumption branch.

The Ohmpilot uses pulse width modulation to regulate the surplus power from the photovoltaic system for one phase. With one phase, it is possible to control a heating element with a continuously variable output of up to 3 kW, for example. The Ohmpilot has two additional outputs for switching further phases. This means that heating elements with an output of 300 W to 9 kW can be controlled.

For a heating element with 9 kW output, the surplus power of 0-3 kW is controlled in phase 1. If more power is available, the Ohmpilot switches to phase 2. Phase 1 can therefore be continuously adjusted between 3 and 6 kW. If the available power is > 6 kW, the Ohmpilot adds phase 3. Phase 1 is again continuously adjusted between 6 and 9 kW

Other resistive loads such as infrared heaters and towel dryers can also be controlled.

Am Gerät befinden sich technische Daten, Kennzeichnungen, Sicherheitssymbole und Warnhinweise. Diese Informationen müssen in lesbarem Zustand gehalten werden und dürfen nicht entfernt, abgedeckt, überklebt oder übermalt werden. Die Hinweise und Symbole warnen vor Fehlbedienung, woraus schwerwiegende Personen- und Sachschäden resultieren können.

Sicherheitssymbole:
	Gefahr von schwerwiegenden Personen- und Sachschäden durch Fehlbedienung
	Beschriebene Funktionen erst anwenden, wenn folgende Dokumente vollständig gelesen und verstanden wurden: diese Bedienungsanleitung sämtliche Bedienungsanleitungen der Systemkomponenten, insbesondere Sicherheitsvorschriften
	Gefährliche elektrische Spannung
	Vor dem Öffnen des Geräts Entladezeit der Kondensatoren abwarten!
	Heiße Oberfläche

Text der Warnhinweise:

WARNUNG!
Ein elektrischer Schlag kann tödlich sein. Vor dem Öffnen des Geräts dafür sorgen, dass Ein- und Ausgangsseite spannungsfrei sind. Entladezeit der Kondensatoren abwarten (15 Sekunden).

WARNUNG!
Das Gerät darf nicht abgedeckt werden und es darf nichts über das Gerät oder die Kabel gehängt werden.

Controlled in a continuously variable manner from 0.3 to 3 kW

Controlled in a continuously variable manner from 0.3 to 3 kW

Controlled in a continuously variable manner from 0.3 to 9 kW.

Temperature limitation
A mechanical temperature switch simplifies commissioning and use. If no mechanical temperature switch is available, a temperature sensor can also be connected to the Ohmpilot. This limits the maximum temperature (see chapter "Temperature limitation" on page).

500 l boiler, heater is installed at the very bottom of the boiler,
temperature spread 45 - 60 °C = 15 °C
4.5 kW heater

Possible storage energy = 500 l (storage capacity) x 1.16 Wh (energy requirement per liter) x 15 °C (temperature spread) = 8.7 kWh. When the heater is fully activated (4.5 kW), it takes approx. 2 hours to heat the tank.

For optimal use of the excess power and rapid reheating of the hot water, adjust the power of the heater to the power of the photovoltaic system, e.g., 5 kWp system power => 4.5 kW heater

Please note the following criteria when choosing a location for the Ohmpilot:

Install only on a solid surface.
		Max. ambient temperatures: 0 °C / +40 °C
		Relative humidity: 0-99%
		The airflow within the Ohmpilot is from the bottom to the top.
If the Ohmpilot is installed in an enclosed space, forced-air ventilation must be provided to ensure adequate heat dissipation.

Please note the following criteria when choosing a location for the Ohmpilot:

Install only on a solid surface.
		Max. ambient temperatures: 0 °C / +40 °C
		Relative humidity: 0-99%
		The airflow within the Ohmpilot is from the bottom to the top.
If the Ohmpilot is installed in an enclosed space, forced-air ventilation must be provided to ensure adequate heat dissipation.

Please note the following criteria when choosing a location for the Ohmpilot:

Install only on a solid surface.
		Max. ambient temperatures: 0 °C / +40 °C
		Relative humidity: 0-99%
		The airflow within the Ohmpilot is from the bottom to the top.
If the Ohmpilot is installed in an enclosed space, forced-air ventilation must be provided to ensure adequate heat dissipation.

IMPORTANT! The IP 54 protection class only applies if the cover is firmly screwed to the back.

IMPORTANT! The IP 54 protection class only applies if the cover is firmly screwed to the back.

IMPORTANT! Depending on the surface, different mounting materials may be required to mount the Ohmpilot. Fasteners and mounting materials are not included in the scope of supply. The installer is responsible for selecting the proper mounting materials. The system must be set up on a level, stable surface.

Fronius recommends using steel screws with a diameter of 4 - 6 mm for mounting the Ohmpilot in masonry.

IMPORTANT! The electrical connection may only be established by an expert.

IMPORTANT! A neutral conductor must be connected to each heating element.

IMPORTANT! Plug & Play - In this application, no further settings are required after successful connection to the inverter.

The Fronius Smart Meter records the current power at the feed-in point and transmits the data to the inverter. The inverter adjusts the available surplus energy to zero by activating the Ohmpilot (specifically by continuously controlling the heating element connected to the Ohmpilot). The surplus energy is consumed by the heating element (steplessly variable).

If no temperature sensor is installed, a third-party source (e.g., gas boiler) must ensure the minimum temperature.

As an alternative, the Ohmpilot can ensure the minimum temperature. To do this, a temperature sensor must be connected so that the Ohmpilot can measure the temperature. This can result in electricity being drawn from the grid.

The maximum temperature must be set on the heating element thermostat. If the heating element does not have a thermostat, the Ohmpilot can also carry out this task as an alternative (see chapter Optional settings on page (→)).

IMPORTANT! A neutral conductor must be connected to each heating element.

IMPORTANT! Plug & Play - In this application, no further settings are required after successful connection to the inverter.

The Fronius Smart Meter records the current power at the feed-in point and transmits the data to the inverter. The inverter adjusts the available surplus energy to zero by activating the Ohmpilot (specifically by continuously controlling the heating element connected to the Ohmpilot). The surplus energy is consumed by the heating element (steplessly variable).

If no temperature sensor is installed, a third-party source (e.g., gas boiler) must ensure the minimum temperature.

As an alternative, the Ohmpilot can ensure the minimum temperature. To do this, a temperature sensor must be connected so that the Ohmpilot can measure the temperature. This can result in electricity being drawn from the grid.

The maximum temperature must be set on the heating element thermostat. If the heating element does not have a thermostat, the Ohmpilot can also carry out this task as an alternative (see chapter Optional settings on page (→)).

IMPORTANT! A neutral conductor must be connected to each heating element.

IMPORTANT! Plug & Play - In this application, no further settings are required after successful connection to the inverter.

The Fronius Smart Meter records the current power at the feed-in point and transmits the data to the inverter. The inverter adjusts the available surplus energy to zero by activating the Ohmpilot (specifically by continuously controlling the heating element connected to the Ohmpilot). This means that the surplus energy is consumed by the heating element (steplessly variable).
Depending on the excess power available, the individual phases are switched on or off and the remaining power is consumed at L1. As a result, the heating element output is divided by three.

If no temperature sensor is installed, a third-party source (e.g., gas boiler) must ensure the minimum temperature.

As an alternative, the Ohmpilot can ensure the minimum temperature. To do this, a temperature sensor must be connected so that the Ohmpilot can measure the temperature. This can result in electricity being drawn from the grid.

The maximum temperature must be set on the heating element thermostat. If the heating element does not have a thermostat, the Ohmpilot can also carry out this task as an alternative (see chapter Optional settings on page (→)).

IMPORTANT! A neutral conductor must be connected to the heating element.

IMPORTANT! A neutral conductor must be connected to each heating element.

IMPORTANT! Plug & Play - In this application, no further settings are required after successful connection to the inverter.

The Fronius Smart Meter records the current power at the feed-in point and transmits the data to the inverter. The inverter adjusts the available surplus energy to zero by activating the Ohmpilot (specifically by continuously controlling the heating element connected to the Ohmpilot). This means that the surplus energy is consumed by the heating element (steplessly variable).
Depending on the excess power available, the individual phases are switched on or off and the remaining power is consumed at L1. As a result, the heating element output is divided by three.

If no temperature sensor is installed, a third-party source (e.g., gas boiler) must ensure the minimum temperature.

As an alternative, the Ohmpilot can ensure the minimum temperature. To do this, a temperature sensor must be connected so that the Ohmpilot can measure the temperature. This can result in electricity being drawn from the grid.

The maximum temperature must be set on the heating element thermostat. If the heating element does not have a thermostat, the Ohmpilot can also carry out this task as an alternative (see chapter Optional settings on page (→)).

IMPORTANT! A neutral conductor must be connected to the heating element.

IMPORTANT! A neutral conductor must be connected to the heating element.

The Fronius Smart Meter records the current power at the feed-in point and transmits the data to the inverter. The inverter adjusts the available surplus energy to zero by activating the Ohmpilot (specifically by continuously controlling the heating element connected to the Ohmpilot and through targeted activation of the heat pump).

In order to be controlled in this way, the heat pump must have a control input (SG Ready or utility release). The heat pump can be switched from normal operation to intensified operation by actuating input 2 of the heat pump with the relay. The heat pump can also be switched to normal operation from a utility lock state by actuating input 1 of the heat pump with the relay. Information on the compatibility of the heat pump with this form of control can be found in the operating instructions of the respective device.

Smaller surpluses are consumed by the heating element (stepless adjustment). From a certain surplus power level, the heat pump should be activated due to the higher efficiency. The average COP (Coefficient Of Performance) for water heating up to 53 °C is 2.5. With 1 kW of electrical energy, 2.5 kW of thermal energy can be generated.

The optimal switching times depend on the following factors:

If no temperature sensor is installed, the heat pump must ensure the minimum temperature. As an alternative, the Ohmpilot can also ensure the minimum temperature through activation of the heat pump. This can result in electricity being drawn 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 Optional settings on page (→)).

This function can also be used with a 3-phase heating element.

IMPORTANT! A neutral conductor must be connected to the heating element.

The Fronius Smart Meter records the current power at the feed-in point and transmits the data to the inverter. The inverter adjusts the available surplus energy to zero by activating the Ohmpilot (specifically by continuously controlling the heating element connected to the Ohmpilot and through targeted activation of the heat pump).

In order to be controlled in this way, the heat pump must have a control input (SG Ready or utility release). The heat pump can be switched from normal operation to intensified operation by actuating input 2 of the heat pump with the relay. The heat pump can also be switched to normal operation from a utility lock state by actuating input 1 of the heat pump with the relay. Information on the compatibility of the heat pump with this form of control can be found in the operating instructions of the respective device.

Smaller surpluses are consumed by the heating element (stepless adjustment). From a certain surplus power level, the heat pump should be activated due to the higher efficiency. The average COP (Coefficient Of Performance) for water heating up to 53 °C is 2.5. With 1 kW of electrical energy, 2.5 kW of thermal energy can be generated.

The optimal switching times depend on the following factors:

If no temperature sensor is installed, the heat pump must ensure the minimum temperature. As an alternative, the Ohmpilot can also ensure the minimum temperature through activation of the heat pump. This can result in electricity being drawn 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 Optional settings on page (→)).

This function can also be used with a 3-phase heating element.

General settings, symbolic representation

Example 1: If "Consume" has been selected for the switch-off threshold and 500 W as the power value, the heat pump is switched off as soon as consumption exceeds 500 W.

Example 2: If "Feed-in" has been selected for the switch-off threshold and a power of 500 W has been entered, the heat pump will be switched off as soon as the power being fed in is less than 500 W.

IMPORTANT! A neutral conductor must be connected to each heating element.

The Fronius Smart Meter records the current power at the feed-in point and transmits the data to the inverter. The inverter adjusts the available surplus energy to zero by activating the Ohmpilot (specifically by continuously controlling the heating element connected to the Ohmpilot). The surplus energy is consumed by the heating element (steplessly variable).

The temperature is measured by the Ohmpilot. If the temperature drops below the minimum temperature value, an external source (e.g., gas boiler) is activated until the minimum temperature is reached again, so that the Ohmpilot only uses surplus energy and does not draw any energy from the grid.

The maximum temperature must be set on the heating element thermostat. If the heating element does not have a thermostat, the Ohmpilot can also carry out this task as an alternative (see chapter Optional settings on page (→)).

The heating element is used for the legionella prevention program.

This function can also be used with a 3-phase heating element.

IMPORTANT! A neutral conductor must be connected to each heating element.

The Fronius Smart Meter records the current power at the feed-in point and transmits the data to the inverter. The inverter adjusts the available surplus energy to zero by activating the Ohmpilot (specifically by continuously controlling the heating element connected to the Ohmpilot). The surplus energy is consumed by the heating element (steplessly variable).

The temperature is measured by the Ohmpilot. If the temperature drops below the minimum temperature value, an external source (e.g., gas boiler) is activated until the minimum temperature is reached again, so that the Ohmpilot only uses surplus energy and does not draw any energy from the grid.

The maximum temperature must be set on the heating element thermostat. If the heating element does not have a thermostat, the Ohmpilot can also carry out this task as an alternative (see chapter Optional settings on page (→)).

The heating element is used for the legionella prevention program.

This function can also be used with a 3-phase heating element.

IMPORTANT! A neutral conductor must be connected to each heating element.

Many heating systems consist of a boiler and a buffer, whereby the central heating feeds the buffer and a controller loads the hot water boiler via a pump. As with thermal photovoltaic systems, the Ohmpilot can first heat the hot water boiler and then the buffer, so that the maximum surplus PV energy can be stored.

The Fronius Smart Meter records the current power at the feed-in point and transmits the data to the inverter. The inverter adjusts the available surplus energy to zero by activating the Ohmpilot (specifically by continuously controlling the heating element connected to the Ohmpilot).

For this application, two heating elements are installed, with preference being given to activating the first heating element (5). Only when the maximum temperature in the boiler (3) is reached is the second heating element activated so that the residual energy is stored, for example, in a buffer.

If no temperature sensor is connected to the Ohmpilot, after 30 minutes the Ohmpilot attempts to output energy via the first heating element once again. If a temperature sensor is present, the first heating element is activated again as soon as a temperature difference of 8°C is reached (compared to the temperature measured prior to switchover).

This switching function can also be used for layering in a boiler/buffer, so that the maximum temperature is reached in the top part of the boiler using minimal energy and the remaining energy is stored in the lower part of the boiler. This stratification effect in a storage tank also allows much more energy to be stored, as a minimum temperature is normally maintained in the upper area of the boiler. As a result, the temperature difference and thus the amount of energy is rather small. In the lower area of the boiler, a high temperature difference of, for example, 50 °C can be used.

Both the first and second heating elements can be 1-phase or 3-phase. For two 3-phase heating elements, see Application example 6. If no temperature sensor is installed, a third-party source (e.g., gas boiler) must ensure the minimum temperature.

As an alternative, the Ohmpilot can also ensure the minimum temperature. This can result in electricity being drawn from the grid. The maximum temperature must be set on the heating element thermostat. If heating element 1 (5) does not have a thermostat, the Ohmpilot can alternatively take over this task (see chapter Optional settings on page (→)). However, it is essential that heating element 2 (7) has a thermostat.

IMPORTANT! A neutral conductor must be connected to each heating element.

Many heating systems consist of a boiler and a buffer, whereby the central heating feeds the buffer and a controller loads the hot water boiler via a pump. As with thermal photovoltaic systems, the Ohmpilot can first heat the hot water boiler and then the buffer, so that the maximum surplus PV energy can be stored.

The Fronius Smart Meter records the current power at the feed-in point and transmits the data to the inverter. The inverter adjusts the available surplus energy to zero by activating the Ohmpilot (specifically by continuously controlling the heating element connected to the Ohmpilot).

For this application, two heating elements are installed, with preference being given to activating the first heating element (5). Only when the maximum temperature in the boiler (3) is reached is the second heating element activated so that the residual energy is stored, for example, in a buffer.

If no temperature sensor is connected to the Ohmpilot, after 30 minutes the Ohmpilot attempts to output energy via the first heating element once again. If a temperature sensor is present, the first heating element is activated again as soon as a temperature difference of 8°C is reached (compared to the temperature measured prior to switchover).

This switching function can also be used for layering in a boiler/buffer, so that the maximum temperature is reached in the top part of the boiler using minimal energy and the remaining energy is stored in the lower part of the boiler. This stratification effect in a storage tank also allows much more energy to be stored, as a minimum temperature is normally maintained in the upper area of the boiler. As a result, the temperature difference and thus the amount of energy is rather small. In the lower area of the boiler, a high temperature difference of, for example, 50 °C can be used.

Both the first and second heating elements can be 1-phase or 3-phase. For two 3-phase heating elements, see Application example 6. If no temperature sensor is installed, a third-party source (e.g., gas boiler) must ensure the minimum temperature.

As an alternative, the Ohmpilot can also ensure the minimum temperature. This can result in electricity being drawn from the grid. The maximum temperature must be set on the heating element thermostat. If heating element 1 (5) does not have a thermostat, the Ohmpilot can alternatively take over this task (see chapter Optional settings on page (→)). However, it is essential that heating element 2 (7) has a thermostat.

IMPORTANT! A neutral conductor must be connected to each heating element.

Many heating systems consist of a boiler and a buffer, whereby the central heating feeds the buffer and a controller loads the hot water boiler via a pump. As with thermal photovoltaic systems, the Ohmpilot can first heat the hot water boiler and then the buffer, so that the maximum surplus PV energy can be stored.

The Fronius Smart Meter records the current power at the feed-in point and transmits the data to the inverter. The inverter adjusts the available surplus energy to zero by activating the Ohmpilot (specifically by continuously controlling the heating element connected to the Ohmpilot).

For this application, two heating elements are installed, with preference being given to activating the first heating element (5). Only when the maximum temperature in the boiler (3) is reached is the second heating element (7) activated so that the residual energy is stored, for example, in a buffer.

If no temperature sensor is connected to the Ohmpilot, after 30 minutes the Ohmpilot attempts to output energy via the first heating element once again. If a temperature sensor is present, the first heating element is activated again as soon as a temperature difference of 8°C is reached (compared to the temperature measured prior to switchover).

This switching function can also be used for layering in a boiler/buffer, so that the maximum temperature is reached in the top part of the boiler using minimal energy and the remaining energy is stored in the lower part of the boiler. This stratification effect in a storage tank also allows much more energy to be stored, as a minimum temperature is normally maintained in the upper area of the boiler. The temperature difference and thus the amount of energy is rather small. In the lower area of the boiler, a high temperature difference of, for example, 50 °C can be used.

The switchover must be performed by an external contactor. If no temperature sensor is installed, a third-party source (e.g., gas boiler) must ensure the minimum temperature.

As an alternative, the Ohmpilot can also ensure the minimum temperature. This can result in electricity being drawn from the grid.

The maximum temperature must be set on the heating element thermostat. If heating element 1 (5) does not have a thermostat, the Ohmpilot can alternatively take over this task (see chapter Optional settings on page (→)). However, it is essential that heating element 2 (7) has a thermostat.

IMPORTANT! A neutral conductor must be connected to each heating element.

Many heating systems consist of a boiler and a buffer, whereby the central heating feeds the buffer and a controller loads the hot water boiler via a pump. As with thermal photovoltaic systems, the Ohmpilot can first heat the hot water boiler and then the buffer, so that the maximum surplus PV energy can be stored.

The Fronius Smart Meter records the current power at the feed-in point and transmits the data to the inverter. The inverter adjusts the available surplus energy to zero by activating the Ohmpilot (specifically by continuously controlling the heating element connected to the Ohmpilot).

For this application, two heating elements are installed, with preference being given to activating the first heating element (5). Only when the maximum temperature in the boiler (3) is reached is the second heating element (7) activated so that the residual energy is stored, for example, in a buffer.

If no temperature sensor is connected to the Ohmpilot, after 30 minutes the Ohmpilot attempts to output energy via the first heating element once again. If a temperature sensor is present, the first heating element is activated again as soon as a temperature difference of 8°C is reached (compared to the temperature measured prior to switchover).

This switching function can also be used for layering in a boiler/buffer, so that the maximum temperature is reached in the top part of the boiler using minimal energy and the remaining energy is stored in the lower part of the boiler. This stratification effect in a storage tank also allows much more energy to be stored, as a minimum temperature is normally maintained in the upper area of the boiler. The temperature difference and thus the amount of energy is rather small. In the lower area of the boiler, a high temperature difference of, for example, 50 °C can be used.

The switchover must be performed by an external contactor. If no temperature sensor is installed, a third-party source (e.g., gas boiler) must ensure the minimum temperature.

As an alternative, the Ohmpilot can also ensure the minimum temperature. This can result in electricity being drawn from the grid.

The maximum temperature must be set on the heating element thermostat. If heating element 1 (5) does not have a thermostat, the Ohmpilot can alternatively take over this task (see chapter Optional settings on page (→)). However, it is essential that heating element 2 (7) has a thermostat.

IMPORTANT! A neutral conductor must be connected to each heating element.

The Ohmpilot can also control a circulating pump in a heating system in parallel to a heating element via the floating contact of the device controller. This is possible with all circulating pumps that have an auxiliary relay.

The designation of the floating contact on the Ohmpilot is NC W NO. When the contact is activated, the switching rocker (W) switches from the "normally open" (NO) position to "normally closed" (NC).

In heating operation, this contact is activated and the circulating pump runs as Heater 2 in parallel to the heating element, which is operated via the output Heater 1.

To prevent the auxiliary relay of the circulating pump from switching on and off continuously in case of low or fluctuating PV power, the Ohmpilot is equipped with a delay. This has a positive effect on the wear and the service life of the relay and the pump.

IMPORTANT! A neutral conductor must be connected to each heating element.

The Ohmpilot can also control a circulating pump in a heating system in parallel to a heating element via the floating contact of the device controller. This is possible with all circulating pumps that have an auxiliary relay.

The designation of the floating contact on the Ohmpilot is NC W NO. When the contact is activated, the switching rocker (W) switches from the "normally open" (NO) position to "normally closed" (NC).

In heating operation, this contact is activated and the circulating pump runs as Heater 2 in parallel to the heating element, which is operated via the output Heater 1.

To prevent the auxiliary relay of the circulating pump from switching on and off continuously in case of low or fluctuating PV power, the Ohmpilot is equipped with a delay. This has a positive effect on the wear and the service life of the relay and the pump.

The data connection is required for communication between the inverter and the Ohmpilot. The inverter mainly sends default values to the Ohmpilot. For some applications, it is necessary to make settings via the Ohmpilot user interface.

There are 3 possible communication channels:

The data connection is required for communication between the inverter and the Ohmpilot. The inverter mainly sends default values to the Ohmpilot. For some applications, it is necessary to make settings via the Ohmpilot user interface.

There are 3 possible communication channels:

Each inverter with a Fronius Smart Meter automatically pairs with the Ohmpilot. If there are several inverters with a Fronius Smart Meter in the network, the Ohmpilot must be manually paired under System Information on the user interface of the inverter to be connected.

Guidance on how to access the user interface of the inverter can be found in the operating instructions of the respective device.

DIP switch settings

The Ohmpilot automatically obtains its IP address from the DHCP server.

The inverter automatically searches for the Ohmpilot, and the search process may take up to 5 minutes. If the red LED is unlit and the green LED is flashing, the Ohmpilot is working correctly.

Setting up the network, symbolic representation

In order to set the IP address manually, the option Static must be selected. Then enter the desired IP address.

There are two options for connecting the Ohmpilot to an existing WLAN network:

Setting up the network, symbolic representation

The user interface can be used to set a static IP address for the Ohmpilot.

The Ohmpilot can then be reached at http://ohmpilotW.local or at the fixed IP address assigned. Alternatively, the Ohmpilot can also be searched for in the network using the Fronius Solar.web app.

Boost mode is used to briefly supply loads on output Heater 1 with 100% of the available power. Over a maximum period of 4 hours, the dimming level is activated at 100%, the phases L2 and L3 are switched through. This can result in electricity being drawn from the grid.

Boost mode can be activated and deactivated by pressing the function button on the Ohmpilot (see Indications/controls on the device) or via the user interface.

Boost mode is used to briefly supply loads on output Heater 1 with 100% of the available power. Over a maximum period of 4 hours, the dimming level is activated at 100%, the phases L2 and L3 are switched through. This can result in electricity being drawn from the grid.

Boost mode can be activated and deactivated by pressing the function button on the Ohmpilot (see Indications/controls on the device) or via the user interface.

When the Legionella prevention function is activated, the hot water is heated to 60 °C at the set interval.

This function ensures that the temperature does not fall below a desired value. If there is not enough surplus power, the external source - if activated - is activated or power is drawn from the grid to ensure a minimum temperature.

Up to four time periods and minimum temperatures can be defined. For example, higher hot water temperatures are available in the evening. More potential for the surplus power during the day is then possible by selecting a lower minimum temperature.

If Heater 1 does not have an adjustable thermostat, this function can be used to limit the temperature.

Tests/specifications per EN60730 Section 1 Table 7.2

Tests/specifications per EN60730 Section 1 Table 7.2

Detailed warranty conditions specific to your country can be found at www.fronius.com/solar/garantie .

Detailed warranty conditions specific to your country can be found at www.fronius.com/solar/garantie .

Waste electrical and electronic equipment must be collected separately and recycled in an environmentally sound manner in accordance with the European Directive and national law. Used equipment must be returned to the distributor or through a local authorized collection and disposal system. Proper disposal of the used device promotes sustainable recycling of resources and prevents negative effects on health and the environment.

CE mark
The devices conform to all the requisite and relevant standards and guidelines that form part of the relevant EU directive, and are therefore permitted to display the CE mark.