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Frequency circulation pump. Frequency circulation pumps for heating. Power consumption and heating

Many circulation pumps are equipped with an asynchronous motor with a squirrel-cage rotor - the most common and reliable device for the operation of pumping equipment. However, for a long time this type of motor had significant drawbacks: the inability to conveniently control the rotor speed and starting current, which was 5-7 times higher than the rated power.

These features are the cause of large energy losses and lead to mechanical shock loads. All this negatively affects the life of the pump. Therefore, modern models are equipped with electronic frequency controllers that solve all these problems.

The principle of operation and the device of frequency regulators

In pumps for heating and water supply, the regulator is necessary to convert the frequency of alternating current and reduce it by 4-5 times. The design of the converters includes a power part (transistors operating in the mode of electronic keys) and a control part. The latter is a digital microprocessor through which power elements are controlled, and it becomes possible to expand equipment control options.

Regulators are of two types:

• Single-phase are used for pumps up to 7.5 kW. Such regulators have one design feature: at the input there is 1 phase with a voltage of 220 V, and at the output there are 3 phases with the same voltage value. This feature makes it possible to connect three-phase electric motors to the device without the use of capacitors.
• Three-phase regulators are designed for networks with voltage from 380 V, and are used in pumps with power from 0.75 to 630 kW.

Pumps with frequency controllers are the most modern models, providing a wide range of possibilities for controlling the operation of an asynchronous motor.

Benefits of Variable Frequency Pumps

Models of pumps with a private trader allow you to control the drive according to a given algorithm, and also have several other important advantages:

• reduce electricity consumption by up to 50%;
• make it possible to adjust the operation of the pump and change the mode of its operation;
• provide smooth start of the engine;
• allow you to adjust the rotation speed, and, as a result, the intensity of circulation, both manually and automatically, according to signals from peripheral devices;
• allow the drive to be started by a timer.

Thus, equipment with frequency control is more energy efficient and allows you to expand the functionality of the pump. You can get professional advice on the choice of circulation pumps at the official representative office of DAB in Moscow.

Circulation pump LPA 32-60 with frequency regulation belongs to the category of energy-saving equipment. This model is recommended to be purchased in order to organize effective forced circulation of the coolant in domestic hot water supply and heating systems of one-pipe and two-pipe varieties.

Main advantages of LPA series pumps

1. Heating systems with constant or variable flow.

2. Hot water systems, floor heating.

3. Systems, air conditioning.

Circulation pumps of the LPA series have a power unit with frequency regulation on permanent magnets. The frequency control system allows, if desired, to set the most appropriate modes of operation in specific situations. These can be modes of maintaining a constant pressure, proportional or night mode with a limitation on the speed of circulation of the coolant.

The presence in the design of the frequency control unit ensures the coordination in automatic mode of the power of the equipment with the actual pressure drop. This properly increases the energy efficiency of the pump, the price of which is quite acceptable to the consumer.

Advantages of LPA series pumps:

1. Fully automatic operation

2. The most economical circulation pump, with little power consumption.

3. Easy installation, does not require air to be released from the system during installation.

The pump has a practical control panel for use. The unit can operate in automatic mode, which is provided by the factory settings. The automatic mode of operation of the pump adapts to the needs of the heating system in each specific case, and also allows you to work with the equipment without additional configuration procedures.

In addition, the LPA series pumps are favorably distinguished by the minimum noise level and low power consumption.

Deciphering the marking of the pump:

The first two digits indicate the conditional diameter of the inlet and outlet of the pump, the second two digits indicate the maximum head in meters multiplied by ten.

The letter B in the marking of the pump indicates that its body is made of brass.

For example:

LPA 25-40 - pump with bore diameter DN25, maximum head - 4 m, body - cast iron.

LPA 20-60 B - pump with bore diameter DN20, maximum head - 6 m, body - brass.

Mains parameters - 220 ± 5%, V, 50 Hz

Degree of protection - IP42

Insulation heat resistance class - H

Noise level - no more than 43 dB

Specifications:

In heating systems, the coolant moves through pipes and radiators, while trying to overcome the strongest resistance that appears naturally due to the viscosity of water, friction, and simply the desire of the liquid to stop flowing. In gravitational heating systems (by gravity), the driving force is the difference in density and temperature of the coolant at the supply and return, and in closed (forced) heating systems, everything is a little different. To compensate for the resistance, circulation pumps are needed that pump water with a certain effort. But, let's be objective, not all heating systems are the same. Everywhere different resistance, and the volume of heating systems is always different. However, the standard approach with three-speed pumps (manual adjustment) may not always be optimal. Somewhere the pump will consume more electricity, as it will be set to a higher gear, and somewhere it simply will not pump the system, as it is set to economy mode, and is simply unable to do its job. How to find a golden mean, and at the same time get the ideal settings for the heating system, and at the same time not overpay for electricity? The answer is obvious - buy a frequency circulation pump.

It’s worth starting with the fact that the developers of these products have carried out lengthy tests and the collection of information related to the development of the most optimal algorithms for the operation of heating systems. At the same time, weather indicators and time intervals of the day were taken into account, when the heating system least required an increased supply of coolant. As a result, even in standard settings you will already have:

Grundfos AutoAdapt mode. The pump automatically adjusts to the heating system, compares the pressure difference at the pump inlet and outlet, and then independently selects the motor rotor speed by frequency adjustment to the required resistance compensation in the heating system, in a given unit of time. In other words, the pump itself will choose the speed of operation, instead of mindlessly working out a rigidly selected speed.

* simple example. Saving even 0.05 kW / h (50 W) per day gives a total electricity consumption of 1.2 kW. This amount grows up to 36 kW per month.... And our winters are long, and it is not difficult to calculate how much extra energy you pay for the heating season.

The FLOWADAPT mode is also available, which combines the AutoAdapt mode and the FLOW limit mode (flow limitation). You can set proportional pressure adjustment values. Adjust settings for constant pressure, regulate circulation pump for constant temperature. There is an operating mode in accordance with the constant characteristic of hydraulic parameters.
Operating mode according to the minimum or maximum characteristic
Automatic night mode puts the heating system into economy mode, reducing the temperature regimes of the system. Naturally, you now have the ability to adjust the temperature range of the pumped liquid over a wide range.

Naturally, circulation pumps, which are used in heating systems of country houses and cottages, by their design belong to pumps with a wet rotor. This technology allows you to almost completely remove the noise from the running pump. It is also worth noting that such pumps are cooled and lubricated by the pumped coolant.

In our store you can order and buy energy-saving pumps of the following modifications: Unipump LPA; Grundfos Alpha 2 (Grundfos Alpha); Grundfos Magna3 (Grundfos Magna) .