Scheme of inserting a circulation pump into a heating system. Proper installation of the circulation pump in the heating system

23.08.202327.05.2017

The circulation pump is a small device that is built into the heating or water supply system. It is designed for forced acceleration of the coolant throughout the heating system. Provides uniform circulation of hot liquid, due to which the room is heated in any room, regardless of where the device is installed. The heating system pump is also designed to save heating costs.

Depending on the contact with water, pumps with a “dry” and “wet” type rotor are distinguished.

What circulation pump to put on heating?

For small private houses, a “wet” pump rotor is suitable, and for huge rooms and multi-storey buildings, a “dry” one. What is their difference? The first type - it is the most economical and silent, but inferior in power, which limits the area of use, which is why it is ideal for a residential building.

Advantages of circulation pumps with a "wet" type rotor:

— lack of noise;

— durability;

- ease of installation;

- saving electricity;

- small size and weight.

Advantages of pumps with a "dry" type rotor:

- high efficiency, which provides uniform heating of large areas.

For heating private houses in the heating system, in 50% of cases, pumps marked 25 * 4 or 25 * 40 are used. The first digit (25) indicates the diameter of the pump connection. The second digit (4 or 40) means the pressure of the circulation pump.

note

Some manufacturers Wilo, Oasis indicate the pressure in meters, other manufacturers Grundfos, Unipump indicate the pressure in decimeters.

Advantages of using heating circulation pumps

Allows heat to be distributed evenly in all rooms.
Rapid system warm-up.
Saving electricity and gas, which is achieved by reducing the cost of starting heating and rapid cooling of the coolant. The system is designed so that the required amount of liquid is first heated, while spending a relatively small amount of energy. The benefit is huge compared to the cost of electricity that runs the equipment.
Durability of use if a properly selected pump is installed specifically for this room.
Universal approach for all heating systems.

In which case is it necessary to install a heating circulation pump if you have a system with natural water circulation.

- Naturally, the question arises if the water in the boiler is already boiling, but the room still does not heat up to the desired temperature.

- If the slope of the heating pipes does not meet the slope standards: 5 mm per 1 linear meter. Instead of destroying walls, installing pipes with the desired slope, you can use a circulation pump, it will be more profitable, more reliable, and without a headache.

- heating pipes in one direction and one pipe passes through the system.

- big savings.

The heating system pump has these wonderful properties.

How much does it cost to install a heating pump?

All this is not so expensive, and even more so, buying a pump more than pays off after a few months of its use, in about a couple of months of the heating season. And then there's the net savings. It is commensurate with the unregulated costs of gas and electricity. A circulation pump for heating a private house can cost from 1,500 rubles. up to 20,000 rubles Installing a circulation pump for heating can cost from 500 rubles. and higher.

Why is a heating pump installed?

Firstly, this will allow the batteries to warm up immediately after being connected to the mains, in contrast to natural circulation, where the heating system takes a long time to warm up.

Secondly, even if the pipes are laid with a negative slope, water circulation with uniform heat distribution is inevitable, due to which the temperature of the heating radiators will even out.

Thirdly, effective disposal of air congestion. Due to the accelerated circulation of the coolant, all air is removed from the heating system in a matter of minutes. But this is often accompanied by the murmur of water in the pipes, which can be annoying.

Fourthly, some configurations of the heating system will not be able to work without a circulation pump due to the high resistance in the pipelines. These are a system of warm walls, a system of warm floors, combined heating systems with heating collectors.

Selecting the right unit

Installing a pump with a high efficiency factor can lead to increased energy consumption, excessive noise, and wear to parts of the device. At the same time, "wet" type pumps are not able to cope with the task of heating large areas, due to the low power of the equipment. In modern heating circulation pumps, there are both manual and automatic modes for controlling the speed of rotation of the motor shaft.

High power factor is achieved at maximum shaft speed. Equip circulation pumps with thermal valves, this will allow you to regulate the heat in the room. When the temperature rises, the valve closes. This leads to an increase in hydraulic resistance and, as a result, an increase in pressure. There is noise, which you can get rid of if you rearrange the equipment at low speeds. But there are pumps with built-in electronics that are able to regulate pressure, depending on the amount of water.

How to install a heating pump?

When buying, you should pay attention to the presence, complete with pumping equipment, of threads with different configurations. If not included, you will have to choose them yourself. You will also need cleaning filters, a check valve in accordance with the diameters of the threads. In this case, it will be possible to do without adapters. For work, as a rule, wrenches, sizes of 22-36 or adjustable wrenches, shutoff valves and a bypass are required - a piece of pipe of a small size. And, in accordance with the rules that are in the box of the purchased device, choose a place for installation.

The video shows which keys we use.

Selecting a pump tie-in location

Previously, it was necessary to install equipment only in the return line. It was believed that such a system prolongs the life of the stuffing box system, rotors, bearings. And now, the position of the pump in space does not play a special role: it can be installed both on the supply pipeline and in the return line. This is due to the fact that modern heating system pumps do not suffer from contact with hot water. It is best to install the pump next to the heating manifold.

Installation of the circulation pump in the heating system

Before installation, you must carefully read the attached instructions for the equipment, which will allow you to understand the basic rules. The most important detail during installation is the correct positioning. Namely, the heating system pump must be located horizontally to avoid air pockets, which will leave the parts without lubrication and lead to overheating of the motor. And, accordingly, this can lead to further breakdown of the circulation pump. An arrow is placed on the outside of the equipment, indicating in which direction the coolant should move.

Video about the heating circulation pump in the Viessmann Vitopend 100 boiler.

A filter is installed in front of the pump, which traps contaminants. If they get inside the circulation pump, parts may be destroyed. Use an ordinary dirt filter. The filters are marked with an arrow that indicates the direction of the coolant flow in the heating circuit. Do not ignore the direction of the arrow, otherwise you will have to clean, or change in the event of a breakdown, the sump and pump.

Electrical connection

Some pumps can continue to work after a power outage from the backup source, which usually lasts for a couple of hours. In connection with this purpose, it is recommended to install an uninterruptible power supply, which allows the circulation to continue working, even in the absence of electricity. Usually during this time, electricians establish an electrical system. Continued uninterrupted operation of the pump in the system directly depends on external batteries connected to the backup power source.

Rules for the operation of the circulation pump:

The heating pump must not operate without water in the heating system.

Operation of equipment with zero coolant supply is not allowed.

The allowable flow rate must be observed. The liquid supply must not be too low or high.

If the pump is turned off for a long period of time, it is necessary to turn it on once a month for preventive purposes, at least for 1-15 minutes, in order to avoid oxidation of parts.

In order to avoid precipitation of hardness salts, use a water treatment system when filling the heating system. Or fill the heating system with a special coolant.

Before starting work, make sure that there is no vibration or noise from the heating system pump.

Check that the equipment motor does not become excessively hot.

Check for water leakage in the places where the pump is installed.

Malfunctions of the heating circulation pump:

If sounds are heard during the operation of the heating pump, but the shaft does not rotate. In this case, the root cause is the possible oxidation of parts. In this case, you must turn off the device from the mains. Drain the water by loosening the central screw of the pump. Unscrew the pump housing itself, remove the motor, and the impeller. If the pump is low efficiency, then the shaft can be unlocked by unscrewing it manually.

At the moment, in many private houses, heating systems of the old type - open are still used. In such networks, heated water flows by gravity through pipes due to thermal expansion, which is not very convenient. The radiators farthest from the boiler in such systems heat up worse than the neighbors. As a result, heat is distributed about the house unevenly. The way out of this situation can be a tie-in to the circulation pump system. Such equipment is not too expensive and consumes little electricity. The benefits from it are enormous. pump into the heating system - the operation is simple, and it may well be done by hand.

Device

You can buy a pump at any store specializing in the sale of equipment for various kinds of engineering systems. Its design is quite simple. An electric motor is housed in a stainless steel housing. An impeller is fixed on its shaft. It is she who distills the water through the pipes.

Varieties

There are two types of circulation pumps:

"Dry". This type is most often installed in heating systems of multi-storey buildings. These pumps are very noisy and have a lot of power. They are usually installed in separate rooms.
"Wet". These rotate right in the water. This is not too powerful, "quiet" equipment. In the event that the owners of a country house have come to the decision that installing a circulation pump in the heating system of a private house is a necessary thing, they should think about purchasing just such a model.

How to choose

When buying a circulation pump, first of all, you should pay attention to such a parameter as the output pressure. It is very easy to define it. To do this, the total length of the water supply must be divided by 10 and multiplied by 0.5. Issued is indicated in the technical passport (in meters).

Where is it installed

Mount the circulation pump in such a way that access to it in the future is free. After all, like any other equipment, it can fail. In this case, it will need to be repaired or replaced.

The pump in an open heating system (as well as in a closed one) is made on the return pipe. In this case, not such a hot coolant will pass through it. This can greatly extend its service life. Only the most modern models made of materials resistant to elevated temperatures can be placed on the supply line.

It is best to mount the pump in an open heating system on the bypass. This scheme is the most convenient. When the system can be simply transferred to the mode of natural circulation.

In closed heating systems, the circulation pump is usually installed in the immediate vicinity of the expansion tank. In the open, you can put it anywhere. But the best option is still considered to be installation next to the boiler.

What else to buy

In addition to the pump itself, the owners of the house will have to buy a coarse filter. This equipment is installed on the bypass directly before the pump itself. It should definitely be cut. Otherwise, the impeller will quickly become clogged with silt or scale. Water even in very clean wells contains all sorts of impurities. In addition, the owners of the house, who decide to carry out such a procedure as an open type, need to purchase:

Stop valve. You will need two high-quality ball valves corresponding to the pump power (3/4 or 1) and one with a diameter equal to the same indicator of the return line.
American, 2 limit switches needed to insert the tap into the line and two for the pump itself.
Tow, mounting clamps for taps, filter nipple.

Installation step by step

Installation in the heating system begins with pumping out the coolant. Further installation is carried out as follows:

A tap is inserted into the return pipe.
The actual operation is performed, such as the assembly of the circulation pump assembly. It must be built into the heating system strictly horizontally (shaft position). Also, during installation, make sure that the terminal box is located on top. To install, they take a ball valve and wind tow on its thread, coat it with paint and screw on the filter.
The nipple and the detachable connection that comes with the pump are wound in series.
The connection is screwed onto the second tap through the tow.
Next, the second parts of the connections are installed on the pump.
After the pumping unit is assembled, you can proceed with its installation in the line. To do this, pipe sections are inserted into the taps located on both sides of it.
The whole structure is attached to the line in such a way that the crane embedded in it is in the middle. Next, marks are made on the pipe, along which holes are cut. In them, and you need to weld bends.
At the final stage, the system is filled with water and pressure tested.

The installation diagram of the circulation pump in the heating system is shown in the figure below.

Expansion tank

This element in the heating system is required. After all, the volume of water pumped into the mains when it is heated and cooled can vary significantly. In systems with natural circulation, open tanks are usually installed. They cost less than membrane ones and do their job quite well. In this regard, the owners of private houses may have a question about whether this element needs to be changed when performing such an operation as installing a circulation pump in a heating system with a natural coolant current.

With a lack of funds, you can leave everything as it is. However, it is better to replace the tank. Membrane structures compared to conventional ones have the following advantages:

They are installed in the immediate vicinity of the boiler, and not in the attic, which, of course, facilitates system maintenance.
When using a tank of this design, contact of the coolant with air is completely excluded. Consequently, the internal parts of the system (boiler, pump, etc.) oxidize less and last longer.
When using a circulation pump, homeowners have the opportunity to create excess pressure in the system. This is done so that air does not accumulate in the radiators. If an open type tank is included in the system diagram, this becomes impossible.

Operating rules

So, the technology for carrying out such a procedure as installing a circulation pump in a heating system with our own hands, we have considered in detail. As you can see, this operation is not too difficult.

However, no matter how carefully the pump is installed, if the operating rules are not followed, it will not last long. To extend its service life, experts advise adhering to the following recommendations:

Do not turn on the device if there is no coolant in the system.
The volume of water in the pipes must be kept within the operating characteristics of the pump.
In the event that the device will be idle for a long time, it should be started from time to time. You need to do this once a month for about fifteen minutes.
It is impossible to allow heating of the coolant above +65 degrees.

Pump Inspection

Installing a circulation pump in the heating system (photos of the most suitable equipment and the process of inserting it are presented on the page), thus - a procedure that can be performed independently. With strict adherence to the installation technology, the coolant pumping device will operate smoothly. But only in the case of its periodic inspections. Moreover, this operation should be carried out at least once a month. The procedure for inspecting the pump is as follows:

The device is connected to the network and checked for extraneous noise.
The pressure of the coolant is checked.
The pump heating temperature is checked.
Threaded flanges are inspected and, if necessary, lubricated.
Check for grounding between the case and the terminal.
The pump is inspected for leaks.
The terminal box is inspected.

Proper installation of the circulation pump in the heating system and compliance by the owners with all the rules for its operation is a guarantee that it will serve faithfully for many years, and life in the house will be comfortable, including in winter.

The circulation pump increases the efficiency of the autonomous heating system, allows 100% use of all heating circuits.

Professional installation of the pump for heating guarantees high performance, reduces noise and reduces maintenance and repair costs. Installation of the device does not cause any particular difficulties, but there are a number of nuances that are important to consider.

We will tell you how to choose a circulation pump, help you decide on the optimal scheme for inserting equipment into the system, outline installation requirements, and also provide step-by-step instructions for installing the device.

Previously, circulation pumps were used only in central heating systems, and for private housing construction, the natural movement of the coolant caused by the temperature difference was the norm.

Now forced circulation is used everywhere due to the emergence of compact and inexpensive models designed to service the heating networks of small houses and cottages.

With the advent of circulation pumps, the number of circuit solutions has expanded. It became possible to lay long highways of varying complexity, while the dependence on the slope has practically disappeared

Due to the increase in the speed of the coolant in the pipeline, thermal energy flows faster to the heating radiators, respectively, the premises warm up faster. The load on the boiler has decreased because the heating of water has also become faster.

The need to install bulky and inconvenient large-diameter pipelines has disappeared, it has become easier to mask the contours under the floor covering or deepen into the walls.

It became possible to install a “warm floor” system on any floor of a private house, which effectively operates only at a certain pressure in the network

The main disadvantage of pumps for heating systems is their dependence on electricity. If the power is intermittent or there is a risk of a complete blackout for some period, it is necessary to install a backup power generator or at least an uninterruptible power supply.

The remaining disadvantages relate to the designs and functionality of devices of various types. For example, monoblock units and devices with a dry rotor are noisier and require constant maintenance, while a wet rotor pump is demanding on the quality of the coolant and has a head limit.

Criteria for a competent choice of equipment

All installation efforts will be reduced to zero if you choose the wrong equipment. In order not to be mistaken, it is necessary to first analyze all aspects of a particular heating system and make the necessary calculations.

The main types of pumps

According to the design features, all devices are divided into 2 categories: with a wet and dry rotor.

Wet pumps. This option is suitable for private houses. The unit is compact, almost silent and has a modular structure that is convenient for maintenance and repair.

But, unfortunately, it does not have high performance - the maximum efficiency of modern models reaches 52-54%.

Circulation devices for heating networks should not be confused with similar devices for hot water supply. The heating pump does not need an anti-corrosion housing made of bronze or stainless steel and additional protection against scale - respectively, and is cheaper

Dry rotor pumps productive, unpretentious to the quality of the coolant, able to work under high pressure and do not require a strictly horizontal location on the pipe. However, they are noisier, and their operation is accompanied by vibration. Many models are mounted on a foundation or metal support frame.

For installation of console, monoblock or "In-line" models, it is necessary. It is advisable to use them when a flow rate of more than 100 m³ / h is required, that is, for servicing groups of cottages or apartment buildings.

Specifications at a Glance

When choosing a pump, be sure to study the technical specifications and compare them with the requirements of the heating system.

Important indicators are:

pressure, which covers the loss of hydraulics in the circuit;
performance- the volume of water or supply for a certain time interval;
coolant operating temperature, max and min - for modern models, on average +2 ºС ... +110 ºС;
power- taking into account hydraulic losses, mechanical power prevails over useful power.

Structural details are also important, for example, the inlet / outlet diameter of the nozzles. For heating systems, the average parameters are 25 mm and 32 mm.

The number of electric pumps is selected, focusing on the length of the heating main. If the total length of the circuits is up to 80 m, one device is enough, if more, additional devices will be required

An example of a unit for equipping a residential heating network with an area of 100 m² is a pump Grundfos UPS with pipe connection 32 mm, capacity 62 l/s and weight 3.65 kg. A compact and low-noise cast-iron device is not audible even behind a thin partition, and its power is enough to transport liquid to the 2nd floor.

Pumps with built-in electronics allow you to quickly switch equipment to a more convenient mode, depending on changes in temperature or pressure in the network. Automatic devices are equipped with digital displays that provide maximum information on the operation of the pump: temperature, resistance, pressure, etc.

Additional information on the calculation and selection of a circulation pump for heating is presented in the articles:

Requirements for the installation of a circulation pump

There are a number of norms that regulate the installation of a circulation pump in a heating system at the legislative level. Some of the rules are set out in SNiP 2.04.05 "Heating ...". For example, it talks about priority in heating networks.

Almost all requirements are justified by the efficiency of the system as a whole and the circulation device in particular. For example, the shaft of a device with a wet rotor must be installed on a pipe strictly horizontally in level so that air pockets do not occur inside and the pump parts do not wear out prematurely.

An obligatory element of the system is an expansion tank, which compensates for changes in the volume of the coolant during heating / cooling. Its place in a closed-type system is on the return line, in front of the circulation pump

A filter against dirt and abrasive particles is needed in any case, even when installing monolithic models. Filtered coolant will bring much less damage to pump parts than liquid with sand and suspensions.

The sump is installed with the stopper down in the direction of water movement to reduce resistance and facilitate system maintenance.

Some rules are dictated by manufacturers. For example, it was customary to install old models of certain brands exclusively on the return line, since they could not withstand high temperatures.

Now pumps have become more versatile and can be installed in any suitable place, but subject to power parameters.

Analysis of the installation technology

The installation process itself is fast, so to fix the case, you need to fix two union nuts. This is very convenient for further maintenance and repair work. But before installation, it is necessary to choose the installation site correctly, otherwise the pump will either work intermittently or will soon fail.

Schemes for tapping the pump into the network

When choosing one of the schemes, it is necessary to take into account the type of heating system, boiler model and ease of maintenance.

Option 1. This is the most common solution: the pump is mounted on the "return", through which the cooled coolant returns to the boiler. Warm water is not so aggressive on the parts of the device, so it lasts longer.

Modern devices can easily withstand high temperatures, but there are still experts who reject such a scheme.

The question of why a circulation pump is needed in the heating system of a private house is not so common today. Consumers have long understood that this small device solves many problems associated with the efficient operation of the heating system as a whole.

First, it increases the efficiency. Secondly, there is an opportunity to save on materials and heating elements. All this below.

Features of forced circulation

The circulation pump installed in the system creates a slight pressure inside. At the same time, the coolant moves at a low speed, evenly distributing heat over all radiators.

Can't the natural circulation of the coolant distribute heat energy evenly?

Maybe, but due to the fact that suburban private houses under construction are becoming larger in size, and, accordingly, the layout of pipe lines is becoming more and more complicated, it is becoming increasingly difficult for the coolant to overcome the configuration of pipe circuits. And in such houses, one simply cannot do without a circulation pump.

Advantages

Under the action of the pump, the coolant passes faster through the entire circuit of the heating system, returning to the heating boiler. At the same time, its temperature will not be low. This means that it will be easier to heat a not very cool coolant. Less fuel consumption costs.

For the natural circulation of the coolant, a large volume of it is necessary so that in its mass it can keep the required temperature. Accordingly, for the normal operation of the heating system in a private house, pipes with a large diameter, radiators with wide cavities, and valves to match the pipes will be needed.

For a system in which a pump is installed, there is no need to keep a large volume of coolant. Therefore, you can safely use pipes and valves with a smaller diameter. And this is a reduction in the price of all products and savings on materials.

Flaws

In principle, such heating has only one drawback - it is volatility. The device is powered by electricity. First, it is, albeit small, but the cost. Secondly, when the power supply is turned off, the pump unit stops working.

Of course, the craftsmen, given this situation, install a bypass through which the heating begins to work on the principle of natural circulation of hot water. And this is a decrease in work efficiency, plus a decrease in efficiency.

Instrument selection

The crucial moment is to correctly calculate the power of the installed pump. Two indicators are taken into account here:

volume of distilled water mass, m³/h;
pressure measured in meters.

It is very difficult to make the correct calculation if you are a non-specialist in this matter. Here it is necessary to take into account the complexity of the layout of pipe lines, the number of radiators and valves, the power of the heating boiler, the materials from which the pipes and other heating devices are made. Therefore, this stage is best left to the shoulders of a professional.

If, nevertheless, you decide to take responsibility for yourself, then it is best to purchase a pump in which you can switch the speed of movement of the coolant.

The ideal option is with automatic adjustment. Such a device costs several times more than a conventional sample, but you are calm that you can configure it yourself to the necessary parameters of the heating system at home.

Calculation example

Before choosing a pump, the following calculation must be carried out. For example, a heating boiler is installed in the basement. Your house is a two-story building. The heating system is a single-pipe wiring.

That is, it turns out that the highest point of the heating system is the upper edges of the radiators installed on the second floor. This is despite the fact that the house has a closed heating system.

Head calculation

From the return pipe, which enters the boiler (it is this section that is the installation site of the device), it is necessary to measure the distance to the upper edge of the radiator on the second floor. This will be the pressure of the pumping device. Essentially, it will go like this:

2.5 m - basement height;
3 m - the height of the first floor;
two floors - 0.5 m;
the distance from the floor to the upper edge of the radiator is 0.6 m.

The sum is 6.6 m. This means that you need a pump with a head of 7 m.

To do this, you need to know the heated area of a private house. For example, let it be 200 m². In order for a private house to be warm, it is necessary to adhere to the ratio: 1 kW of thermal energy per 10 m². That is, you need 20 kW.

The next indicator is the temperature difference between the supply and return circuits. Experts recommend within 10 ° C. That is, if at the exit from the boiler the temperature of the coolant is +70 °C, then at the entrance it is +60 °C. Now perform this mathematical action: 20:10=2. This is the pump power, measured in m³ / h.

As you can see, choosing a pump is not so difficult. Of course, this is the simplest calculation without taking into account various nuances. But it can be taken as a basis, adding 20% just in case.

Installation

Doing it yourself, if you do not know all the nuances of the installation process, is better not worth it. But you need to get acquainted with the technology and the sequence.

Installation location

The pump is installed on the return line next to the heating boiler. This is done for one single purpose - to reduce the temperature loads on the seals, cuffs and gaskets that are used in the design of the unit itself. Under the influence of high temperatures, they quickly fail.

There are two types of devices: wet rotor and dry. Usually the first option is low-power pumps used for heating small private houses. It is cut directly into the pipeline, connecting on both sides with a thread. The second is a more powerful setup. Such pumps are most often connected using flanges.

Stop valves and filter

The pump is cut off from the pipe by two valves (ball valves), which, if repairs are necessary, are closed.

A bypass must be installed. This is a pipe that connects the pipeline, bypassing the pumping unit. A valve must be installed on the bypass. It blocks the flow of the coolant when the pump is running. And opens when the device stops working or in the process of repair. That is, the bypass works in emergency cases so that the heating does not stop if the pump itself stops.

Today, a coarse filter is often mounted in front of the pump. He is responsible for the quality of the coolant.

Popular manufacturers

The question of how to choose affects not only the technical characteristics of the device. Most often, consumers understand the brand or manufacturer as it. The modern market offers a fairly wide range. Here are foreign analogues, and domestic ones. Here are just a few models.

Italian pump Aquario

His model AC204-130 is one of the most popular. Used for small private houses. Its power is 2.4 m³ / h, head up to 3 m, power consumption 0.64 kW, weight 3.4 kg.

The connection is flanged, has three speed modes.

Italian device DAB VA-VB-VD

It has a wide range of technical characteristics: head up to 6 m at power from 0.5 to 3.3 m³/h.

This sample is equipped with a special thermal relay that turns off the pump if it starts to overheat. Many experts advise choosing this particular model.

The Danish company Grundfos offers pumps of five modifications. In Russia, the UPS model has gained great popularity as the most economical in terms of electricity consumption (0.55 kW).

At the same time, its head is 3 m, and the volume of the pumped coolant is 3 m³ / h.

Russian models

Among domestic manufacturers, it is necessary to single out pumps of the brand "Khozyain" from Podolsk and "Compass" from the company "Dzhileks". A few technical specifications:

Owner 4.25.180 - head 4.2 m, power 3 m³ / h;
Owner 8.32.180 - head 8 m, power 9.6 m³ / h;
Compasses 25/40 (head 4 m, volume 2.5 m³ / h) - the smallest sample;
Compasses 32/80 (head 8 m, volume 3.2 m³ / h) - the largest.

Both brands produce pumps that are connected to the pipeline with a flange connection.
So, knowing the brands and models offered by manufacturers, you can choose the right pump, taking into account not only its technical characteristics, but also the price.

The construction of a private country house usually involves the construction of an individual autonomous heating system. Such equipment, with proper installation, will be much more economical and efficient than connecting to the main heating. In particular, in an autonomous system, the distance that the coolant passes from the place of heating (heating boiler) to the location of heating devices (radiators) is significantly reduced.

An individual heating system can be built both using the principle of free circulation of the coolant (hot water flows through pipelines by gravity), and using pumping equipment. In the latter case, the owner of the house faces the question: how to install it for heating?

Do we need a pump?

Of course, an individual heating system can work perfectly for many years without the inclusion of pumping equipment in it. However, the use of circulation heating pumps significantly increases the efficiency of heating.

First of all, the inclusion of a pump in the system reduces the inertia of the movement of the coolant. When hot water moves by gravity, the heated coolant can reach distant heating radiators after a considerable time. As a result, the temperature of the liquid in the pipelines has time to decrease, and the radiators do not heat the premises as efficiently. The difference in the time of passage of the coolant can reach an hour or more. Using the pump, all radiators in the house will heat up evenly.
Also, when using a pump, it is possible not to build a piping system with exact observance of the slope angle. Even if in some part of your house the heating pipe goes “uphill”, the coolant under the action of the pump will overcome this section without any problems and air jams will not appear in the system.

But any technical solution can have its drawbacks.

Electricity in our country is not yet free, so a person working in the heating system will eat up money from your budget. The power of pumping devices can be from 55 to 100 watts.
The presence of a pump in the system immediately makes it volatile, so that with any power outage, you will have problems with heating.
Stopping the pump can cause excessive heating of the coolant, which will cause a rupture of the heating circuits or defrosting of remote segments of the heating pipelines.

How is circulating heating pump equipment arranged?

Pumping devices are installed in closed home heating systems. A typical pumping device has a stainless metal casing. The housing contains an electric motor. An impeller is placed on the motor shaft, and it moves the heat carrier through the pipes. The device of pumping equipment for heating systems is generally similar to conventional water pumps.

Varieties of circulation pumping devices

According to the principle of work pumping devices that circulate the coolant in heating systems can be divided into "wet" and "dry".

IN "dry pump" the rotor of the electric motor, located behind the sealing partition, does not come into contact with the heat carrier. During the operation of the “dry pump”, when the sealing rings rotate, a film of water forms between them, which prevents the coolant from penetrating to the motor rotor. Such a pumping device operates with an efficiency of about 80%. The disadvantage of such equipment is increased noise, it is recommended to install it in a separate room.

"Dry" circulation pumping devices can be vertical, horizontal or block type. The type of pumping device affects the technology of its installation and is usually indicated in the technical data sheet of the equipment. In addition, a distinguishing feature of the "dry" type pumping devices is the need to install them in clean rooms, due to the fact that they are very sensitive to the presence of dust. "Dry" pumps should only be started when there is heat transfer fluid in the system, otherwise the O-rings may be destroyed.

In circulation pumping equipment made according to the "wet" technology, rotating elements (an impeller attached to the rotor) are immersed in a liquid heat carrier. Hot water in this case simultaneously acts as a lubricant and coolant. Such pumping devices are more reliable and unpretentious in operation, but have a much lower efficiency - about 50%. Such equipment performs well in domestic heating systems, their efficiency is quite enough to create coolant circulation in a private house.

Choosing a circulating heating pump

The main criterion for choosing a circulation pumping device for heating is its power. It must correspond to the volume of the autonomous piping system. Insufficient power will not allow you to effectively use all the advantages of a forced circulation heating system. Excessive power will be a waste of money.

In order to calculate the required power of the pumping device, it is necessary to collect the following information:

section of the heating pipeline;
coolant temperature;
heating boiler performance;
throughput of pipelines.

In order not to use complex formulas, the required model of the circulation pumping device can be selected according to the output pressure.

The required pressure is calculated using a very simple formula: 0.5 units (meters) of pumping head \u003d 10 meters of the length of the heating pipeline.

Prices for the circulation pump

circulation pump

Installation options for circulation pumping devices

To the heating system circulation pumping equipment can be installed according to two main schemes: one-pipe and two-pipe.

IN single pipe system there is a constant flow of coolant. The temperature difference in it is not very large.

IN two-pipe system the flow rate of the coolant depends on the mode of operation, and the temperature difference of the liquid in the system can reach large values.

Components of the heating system

Boiler.
Air valve.
Thermostat device.
Heating radiator.
balancing valve.
Expansion tank.
Stop valves.
filtering device.
Circulation pumping device.
A device for measuring pressure in the system.
Safety valve device.

Self-installation of a heat circulation pump

When installing a pumping device, remember that it needs to be serviced from time to time. Therefore, easy access must be provided to its location. The most convenient place for installing pumping equipment will be a section of the return pipeline (return), located in front of the inlet pipe of the heating boiler.

Such a place of installation will ensure the operation of the pump with a relatively cold coolant, which will significantly increase the service life of the device. In addition, the installation of a pump on the return pipe prevents the accumulation of air in the heating boiler tank. This prolongs the life of the equipment and prevents the liquid from being trapped in the storage tank.

Algorithm for installing a pumping device

Step 1. Drain the water from the heating system. If necessary, carry out hydrodynamic cleaning of pipelines and heating radiators.

Step 2 An additional bypass of the pipeline is located at the selected installation site of the pumping device, it is called a bypass. The purpose of the bypass is to ensure the circulation of the coolant in the system when the circulation pump is turned off or broken. The size of the bypass piping must be smaller than that of the main system.

Step 3 Installing a circulation pump. During installation, it is necessary to orient the pump so that the entire working part (shaft and impeller) is covered with the coolant. Remember that running the pumping device dry without load can cause serious damage to the equipment. Also, improper orientation of the pump leads to a decrease in its efficiency. The actual output of the pump can be reduced by 30%. You can find a diagram of the correct orientation of a specific pump model in the instruction manual.

When choosing the location of the pumping device and during its installation, it must also be taken into account that the terminal box must be located at the top of the equipment. Otherwise, even with a small leak or when condensation forms, it can be flooded with water. The result is a short circuit.

Step 4 Ball valves must be installed on the inlet and outlet pipes of the pumping device of the heating system. They facilitate the procedure for dismantling and repairing equipment.

Step 5 Install a water filter in front of the inlet pipe of the pumping device. It will prevent small particles suspended in the coolant from entering the pump. This will significantly delay the repair work.

Step 6 Install a valve assembly on the bypass bypass. It will bleed air pockets, if any, in the system.

Step 7 Seal all joints with silicone sealant. This will prevent leaks from occurring.

Step 8 Fill the heating system with a liquid heat carrier, bleed air pockets from it by opening the central valve device.

Note! Bleeding of air pockets must be done before each switching on of the pumping device.

Maintenance of circulation pumps in heating systems

Typically, circulation pumps in home heating systems do not require regular maintenance. In case of breakdowns, you can contact the specialists of the service centers. But in order for your equipment to work without breakdowns, you must follow some rules.

Do not turn on the pumping device if there is no coolant in the heating system.
Make sure that the pump works with the volume of water and the power for which it is designed according to the passport data.
Do not leave the pump switched off for a long time. Even in summer, perform a preventive start every month. 15 minutes of operation of the equipment will be enough to prevent stagnation of parts of the mechanism.
Make sure that the temperature of the coolant at the installation site of the pumping equipment is not very high. The maximum allowable temperature is 65 degrees. When the heating is exceeded, hard salts precipitate in the liquid heat carrier, which significantly wear out the equipment.

Installation and operation of pumping equipment in heating individual autonomous systems does not cause any particular problems. To learn more about this issue, watch the tutorial video.