Do-it-yourself dub pumps

In detail: do-it-yourself dub pumps from a real master for the site my.housecope.com.

The circulation pump is often used in individual heating systems in private houses. This equipment makes it possible to efficiently circulate the coolant along the circuit, which ensures a stable temperature throughout the room. The quality of heating depends on the operation of the device.

Circulating pumps serve for a long time and are rarely damaged. However, if malfunctions occur, you can repair the device yourself. An important fact is that pumps of different models have the same operating principle, are subject to the same breakdowns, therefore, the methods for their elimination are the same.

In large rooms, the pipes are long and the water circulates in the system slowly, having time to cool down before returning in a closed loop back to the boiler for reheating. To solve this problem, they resort to the help of circulation pumps, which forcibly force the coolant to move faster along the contour.
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To repair the equipment yourself, you should know its device:

Steel body, elongated horizontally. It contains all the elements of the system. The body can also be made of aluminum alloy or stainless steel.
Electric motor and rotor housed in a housing.
Impeller with blades fixed to the rotor. The blades are curved in the opposite direction from the movement of the wheel. This part is made from durable polymers.

When the pump is turned on, water in the circuit is drawn into the inlet by the rotation of the wheel. In the chamber, centrifugal force acts on the water, pressing it against the walls of the chamber and pushing it out. After that, the pressure drops and water is pumped back into the pump.

Video (click to play).

The device of modern circulation pumps

With such a continuous cycle of operation, the temperature in the heating system is constantly kept at the same level. This saves fuel or energy costs.
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What breakdowns can occur and how to repair the circulation pump with your own hands? Let's figure it out.
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Foreign object in the impeller chamber.
Prolonged downtime of the apparatus led to oxidation of the rotor shaft.
The power supply to the device terminals is interrupted.

In the first case, you can eliminate the malfunctions by carefully removing the device and unscrewing the housing in the impeller area. If there is a foreign object, remove it and turn the shaft by hand. To avoid re-entry of foreign matter, a filter should be installed on the nozzle.

The humming of the pump can also be observed during prolonged downtime and shaft oxidation. It is necessary to thoroughly clean all oxidized areas and lubricate the movable parts of the working unit.

The circulating pump hums even if the power supply fails. First check the voltage with a tester. If the cable is damaged or broken, it should be replaced. If the cable is in order, look at the voltage at the terminals. The infinity icon on the tester indicates a short circuit. A lower voltage means an open winding. In both cases, it is necessary to replace the terminals.
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The pump does not work when there is no mains voltage. The tester checks the voltage, as well as the correct connection of the device to the power supply.

Circulation pump shaft

If there is a fuse in the pump, there is a risk that it will burn out from power surges. If this happens, replace the fuse. It is advisable to install a reliable stabilizer.
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Limescale deposits between the moving parts of the appliance.
Incorrect connection of the pump in the area of the terminals.

The pump can turn on, but also stop immediately if there is scale. Remove limescale and lubricate the joints between stator and rotor.

In the second case, check the tightness of the fuse on the device. It is removed and all clamps are cleaned. All wires must be correctly connected in the terminal box.
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If the pump is noisy, it could indicate the presence of air in the system. It is necessary to bleed the air from the pipes, mount a unit in the upper part of the circuit so that the air is released automatically.

The pump can also make noise due to wear on the impeller bearing... It is required to disassemble the body of the device, and, if necessary, replace the bearing.
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If the activation of the pump is accompanied by vibration and noise, then the reason is insufficient head in a closed circuit. You can solve it by adding water to the pipes or increasing the pressure at the pump inlet.
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With a low pressure or when the pump almost does not pump the coolant, check the direction of rotation of the impeller in the body of the apparatus. If the impeller turns incorrectly, then you made a mistake when connecting the pump to the terminals in phases, if you use a three-phase network.

A decrease in head may result from the high viscosity of the coolant. At the same time, the impeller experiences increased resistance and does not work well, not at full strength. It is necessary to check the mesh filter and clean it. It is also advisable to check the cross-section of the pipes of the holes. After that, you will need to adjust the correct parameters of the pump.
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The pump will not turn on if there is a power problem. It is necessary to check the phases and fuses. If they are in order, then the drive winding has burned out. In this case, you will have to seek help from specialists.

The internal surfaces of the pump must be free of rust

When diagnosing equipment, you can use the indicator - a tester of the rotation of the circulation pump shaft. It allows you to make sure that the pump is working without being connected to the mains.
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The temperature of the pump must be the same as the temperature of the pipes of the heating system. If the circulation pump heats up and its temperature is higher than that of the pipes, then there are errors in installation or a problem with operation. Let's consider why the device is heating up.

If installed incorrectly, the pump starts to overheat immediately after switching on. Installation errors are the easiest to spot.
Clogged loop. Rust and various deposits accumulate in the system. This leads to a narrowing of the diameter of the passage for the coolant. The load on the machine increases and the engine overheats. Preventive maintenance of the system will be required.
Rust, debris, limescale in clogged communications can get into the pump and jam the electric motor, causing it to warm up. Disassemble and clean the device, otherwise the motor coils will quickly fail.
The pump is also heating up due to a lack of bearing lubrication. Under these conditions, they wear out much faster, thereby reducing the service life of the entire apparatus. The motor is seized. The pump should be taken to a workshop.
When the mains voltage is below 220 V, the pump overheats and can quickly fail. Determine the voltage in the network as soon as the engine starts to warm up in order to immediately exclude or confirm this problem.

If the circulation pump heats up, you do not need to disassemble it immediately. First, measure the voltage in the network. At normal voltage, the system is washed with caustic soda, leaving it in the pipes for an hour, and then drained. If the pump is still warming up, you will need the help of specialists.
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In order for your pump to serve for a long time and reliably, you should follow the operating rules and carry out regular preventive maintenance. The apparatus should be inspected periodically:

If a leak is detected at the joints, replace the gaskets and seals.
Check the grounding.
Extraneous sounds should not be present when the engine is running.
There should be no strong vibration.
The line pressure is measured.
The pump must be dry and clean.

Every two to three years, the device is cleaned, all of its components. Regarding models that can be disassembled. Pumps with one-piece or pressed-in casing cannot be repaired, and if a breakdown occurs, it is replaced with a new one. How to disassemble a circulation pump yourself?

Testing and repair of the electrical unit of the circulation pump

To do this, you need a hex wrench, a flat screwdriver (slotted) 4 and 8 mm, a Phillips screwdriver.

First, all the water is drained from the system, the pump is dismantled and then they are disassembled.

Using a wrench or a screwdriver, unscrew 4-6 bolts on the body at the point where the pumping part is connected to the shell.
The shell is removed, while the impeller remains on the rotor shaft with the engine.
Drainage holes are found around the perimeter. There should be four of them. With a slotted screwdriver, little by little pry the jacket of the electric motor compartment under the impeller. The shaft with the rotor and the impeller must come out of the grooves and the stator cup.

The disassembly of the unit is now complete. Next, the rotor, impeller, shell are cleaned from scale and plaque without damaging the parts. Do not use coarse abrasives. It is recommended to clean the parts with a hard polymer bristle brush. You can use cleaning agents that contain a weak solution of hydrochloric acid. Sometimes they use fine emery - "zero".

Popular manufacturers of circulation pumps are Webasto, Wilo, Ggrundfos, Dab. Models of these brands are reliable, and damage can occur only if the operating conditions are not followed. If you still have to resort to repairing the circulation pump, then finding and purchasing the corresponding parts on the Internet will not be difficult. A repair kit for the circulating pump u 4814, which is very popular in the modern market, like other models, can be ordered in many online stores.
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Owners of autonomous heating know that a circulation pump is needed for normal circulation of the coolant.

Private houses are mainly located far from service centers or workshops, so it is worthwhile to master the repair of a circulation pump with your own hands.

The pump, like other equipment, needs maintenance. To prevent breakdowns, you must follow these recommendations:

In summer, when the device is not working, it must be turned on at least once a month for 15 minutes. But at the same time, the device should not run dry: if the pipes are currently empty, they simply pump water from one container to another, connecting the unit to them with hoses. This procedure will prevent oxidation of the shaft surface and prolong bearing life.
During the heating season, attention should be paid to the operation of the device from time to time. Has the unit started to make noise, vibrate, or other signs of malfunction? Is the circulation pump not getting too hot? After all, the early stage of the malfunction is much easier to eliminate than the neglected one.
If there is a coarse filter in the heating system in front of the pump, then it is periodically checked for rust or other contaminants.
Do not forget about the lubricant and check its sufficient availability in the provided places.

General arrangement of the circulation pump

Compliance with all operating rules of the device does not guarantee the uninterrupted operation of the unit. Breakdowns may occur that do not depend on human actions: a filter clogged, voltage drops, etc.

If the engine does not turn on, but the pump does not generate hum or other strange sounds, it is worth checking the fuse. It reacts sharply to power surges and melts when the engine is threatened, thereby opening the electrical circuit. In this case, the fuse will have to be replaced, after which the device will return to normal operation.

If the failure was not in the fuse, check the power cable, the circuit breaker in the junction box, and the electrical wiring. The wire section or switch may need to be replaced.

After checking the wiring, it is worth moving on to the winding of the electric motor. Its serviceability is checked by measuring the resistance. The multimeter should read 10-15 ohms. Some units are equipped with a starting winding with a resistance of 35-40 ohms.

If the multimeter displays "infinity", then the winding is out of order. And when the readings are closer to zero, an inter-turn closure happened. In this case, turning on the device is accompanied by the fuses in the panel blown.

Circulation pump testing

Modern devices have a low noise level, so often the owner of such a unit cannot understand - is it working or not? To diagnose the device, use the indicator tester of the rotation of the circulation pump shaft, which will show without a power supply whether the device is working properly. To do this, you need to bring your indicator to the motor shaft and the scale will show whether the shaft rotates or does not work at all.

When the circulation pump hums, but the shaft with the impeller does not rotate, it is worth immediately turning off the unit, because the motor winding may burn out. There are several reasons for this malfunction:

The shaft does not work due to downtime during the summer. For the same reason, the impeller sticks to the casing. In this case, it is necessary to disassemble the device and manually turn the shaft. Manufacturers took this moment into account, so a notch for a screwdriver is made on the shaft.
The impeller does not rotate due to a foreign object in the chamber. After removing it, the system will resume.

If the device makes unusual noise during operation, it may be trapped air in the system. For removal, it is recommended to install an automatic air vent on the heating circuit. But if it is not there, then the air is vented manually.
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The device temperature must match the temperature of the heating medium pipes. If it rises higher, it means that errors were made during installation, or improper operation takes place. The circulation unit can heat up for the following reasons:

New generation circulation pump device

initially incorrect installation. It is not difficult to determine the problem: the pump heats up at the initial stage, immediately after installation.
blockage in the system. With prolonged operation, deposits and rust accumulate in the pipes, which leads to a decrease in the water passage. The device is overloaded to ensure normal circulation of the heating medium. At the same time, the engine overheats, but unscheduled maintenance can cope with the breakdown.
foreign body. With slagged communications, pieces of rust or plaque break off from pipes and radiators, which, when they get into the device, jam the electric motor. If the device is not disassembled and cleaned in time, the coils of the electric motor may well fail and the device will simply stop turning on.
lack of lubricant for bearings. With an insufficient amount of lubricant, the bearings are poorly lubricated and wear out quickly, which leads to a reduction in the service life of the unit as a whole. If the engine is seized as a result, the pump is dismantled and returned to the service center.
low voltage in the network. At a voltage below 220 V, the electric motor overheats and quickly fails. In the first minutes of overheating, it is worth checking the voltage in the network with a voltmeter, because the problem may not be in the pump.

One of the problems that happens with heating units is the operation of the pump without pumping water. There are four reasons for this condition:

air ingress or water leakage, which is eliminated by repairing holes and cracks in pipes;
incorrect regulation of the heating system.The malfunction is solved by checking the correct position of the taps (primarily to the pump);
no water. It is worth repairing such a malfunction by supplying water to the device.
Blocked or stuck valve. To eliminate it, the valve should be repaired or replaced.

To repair the circulation pump, it must be dismantled and disassembled. Dismantle the device according to the following scheme:

Dismantling the circulation pump

The unit is disconnected from the power supply. In order to disconnect the cable from the terminal box, it is necessary to remove the case from the power supply unit of the device.
Shut off the liquid supply with the side valves and drain the remainder in the system.
The device is unscrewed with a hex screwdriver, but suddenly the bolts have become stuck, they are moistened with a special WD liquid and after 20-30 minutes they try to unscrew again.

After dismantling, the unit cover is removed. Under it is a rotor with a wheel and blades. Basically, the rotor is secured with clamps or bolts. After removing it, access to the inside of the device opens. By carefully examining the pump, malfunctions are detected and eliminated.
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Replacing the repair kit for the circulation device includes:

disassembly of the pumping part of the device;

replacement of components;

checking engine operation;

assembly of the device;

diagnostics of equipment operation.

Some manufacturers offer a ready-made repair kit for pumping equipment. For example, a repair kit for a circulation pump u4814 with a capacity of 5200 l / h, a voltage of 12/24 V and a branch pipe diameter of 38 mm. Buying such a kit will reduce the waste of time and money.It is worth repairing the circulation device with your own hands only after the expiration of the warranty period or if it is impossible to call a repair specialist. Some pump assemblies are difficult to find on the free market, which is explained by the trade policy of manufacturers.Therefore, in some cases it will be more economical to buy a new device, rather than repair a broken one.Circulation pumps of various types are often used today in country houses and summer cottages, which makes it possible to make the operation of autonomous heating systems more efficient and at the same time save on energy resources. Meanwhile, if such a hydraulic machine fails, the entire heating system ceases to function, which puts its user with a choice: use the services of qualified specialists or repair the heating circulation pump with his own hands.Dismantling the circulation pumpThe reasons for the breakdown of circulation pumps, the types of which differ from each other in certain design features, are associated both with non-compliance with the rules for operating such equipment, and with the quality of the coolant, drops in the power supply network, as well as with a number of other factors. Before deciding on an independent repair of the circulation pump, you should understand well the design and principle of operation of such a device, which will allow you to establish the exact cause of its failure and eliminate it.Without knowing the design of the circulation pump, you will not only be able to repair such a hydraulic machine, if necessary, but also engage in regular maintenance. The design of circulation pumps is:

a body made of stainless steel or non-ferrous alloys;

an electric motor, the shaft of which is connected to the rotor;

directly the rotor itself, on which the wheel with blades is installed - the impeller (its blades, which are constantly in contact with the pumped medium, can be made of metal or polymer materials).

Circulation pump designThe circulation pump operates, regardless of its design, according to the following principle.

After the electric current is supplied, the shaft of the drive motor begins to rotate the rotor on which the impeller is installed.

The heat-transfer fluid entering the inner part of the pump through the suction branch pipe is thrown by the impeller and centrifugal force to the walls of the working chamber.

The liquid, which is subject to centrifugal force, is pushed into the discharge pipe.

As mentioned above, depending on the design features, the circulation pump for heating can be of different types. So, devices with a rotor are distinguished:In private houses, the most commonly used circulation pumps are "wet" typeFor circulation pumps of the first type, which are used mainly for equipping domestic heating systems, the rotor is constantly in a liquid medium. This not only contributes to the lubrication of the moving parts, but also to their efficient cooling. The main advantages of this type of equipment include:

low noise level during operation, since the water, in which all the moving elements of such a device are located, perfectly absorbs vibrations;

ease of installation (such pumps simply cut into the pipeline), maintenance and repair.

Meanwhile, pumps with a "wet" rotor, if we talk about their shortcomings, are not very efficient, can be installed only in a horizontal position and are very critical of the lack of liquid in the heating system.Pumps with "dry" rotor are installed in separate boiler rooms and are used in systems that heat large areasThe drive motor of pumps with a "dry" rotor is placed in a separate unit. Rotation from the motor shaft is transmitted to the impeller by means of a special coupling. Unlike devices with a "wet" rotor, pumps of this type are characterized by a higher efficiency (up to 80%), but also by a more complex design, which somewhat complicates the procedures for their maintenance and repair. Circulation pumps with a "dry" rotor are cut into the pipeline and their body is fixed to the wall, for which a special console is used.In order not to face situations in which the circulation pump installed in the heating system will require repair, it is necessary to strictly follow the rules for operating such equipment, which are as follows.

If there is no water in the pipeline, it is impossible to start the circulation pump.

The value of the generated water pressure must be within the characteristics specified in the technical passport of the circulation pump. If the device produces a reduced or, conversely, increased water pressure, this can lead to its rapid wear and, accordingly, failure.

During the period in which the heating system is not used, the pump must be turned on for circulation at least once a month for a quarter of an hour, which will prevent oxidation and blockage of its moving parts.

It is very important to ensure that the water temperature in the heating system does not exceed 65 °. In water heated to a higher temperature, a precipitate begins to actively form, which, interacting with the moving parts of the hydraulic machine, contributes to their active wear and, accordingly, the failure of the entire device.

It is necessary to inspect the circulation pump and check the correctness of its operation on a monthly basis. Such measures make it possible to identify malfunctions in the operation of equipment at the initial stage and promptly take appropriate measures.Periodic inspection of the circulation pump will significantly reduce the likelihood of its failure during the heating season.Checking the circulation pump for correct operation includes such actions as:

switching on the hydraulic machine to the operating mode and checking the level of noise and vibration generated by it;

checking the pressure (pressure level) of the coolant created in the discharge pipe (as mentioned above, the pressure of the liquid must be within the values given in the technical data sheet);

control of the degree of heating of the engine, which should not be too high;

checking for the presence of grease on the threaded connecting elements of the pump and applying it if it is absent;

checking the presence and correctness of the grounding of the body of the hydraulic machine;

checking for leaks both on the pump casing and in the places where it is connected to the pipeline (if leaks are present in such places, it is necessary to tighten the threaded connections and check the integrity of the installed gaskets);

Inspection of the terminal box and check if the wire is fixed in it (in addition, it is necessary to check whether moisture gets into the terminal box, which is unacceptable).

The main reason for the rapid wear of friction bearings in pumps is considered to be the increased contamination of the coolant.It is possible to single out several of the most typical malfunctions for circulation pumps, which are quite realistic to eliminate with your own hands. Such malfunctions can be identified by their characteristic signs, without even disassembling the pump and without using complex diagnostic equipment.A situation where the pump is noisy but the impeller is stationary is often caused by oxidation of the drive motor shaft. This can happen due to the fact that the hydraulic machine has not been used for a long time. To repair the heating pump with your own hands with such a malfunction, you must perform the following steps:

disconnect the power supply;

drain all water from the pump and the adjacent pipeline;

by unscrewing the corresponding screws, dismantle the drive motor together with the rotor;

resting on the working notch of the rotor with a hand or a screwdriver, turn it by force, moving it off the dead center.

Disassembled circulation pumpThe pump will make noise, but it will not work even if a foreign object gets into its inner part, which blocks the rotation of the impeller. To repair the circulation pump in such a situation, do the following:

turn off the power supply;

drain water from the pump and the adjacent pipeline;

disassemble the pump according to the above scheme;

remove a foreign object;

a strainer is installed on the inlet pipe.

This is how the body of the circulation pump looks from the inside.If the switched on circulation pump does not make noise, but also does not work, there may be problems with the power supply. To identify the cause and eliminate such a malfunction, disassembly of the circulation pump may not be required: using a tester, they check the level and presence of voltage at the terminals of the device. In many cases, to eliminate such a malfunction, it is enough to correctly connect the pump to the power supply.If there is a fuse in the design of the circulating pump, then it could burn out during a voltage drop in the mains, which can also be the reason why the heating pump does not work and does not make noise when it is turned on. To restore pump operation, simply replace the blown fuse.Armed with a tester and a schematic diagram, you can find more serious breakdowns in the electrical part of the pump, for example, burned out windingsIn the event that a layer of lime deposits has formed on the inner surface of the stator, the running pump will periodically stop. To solve this problem, it is necessary to disassemble the pump and clean all its internal parts from lime deposits.The reason for the loud noise of the equipment when pumping liquid can be the presence of a large amount of air in the pipeline. To eliminate such a problem, it is enough to bleed air from the pipes.In order not to face this in the future, you can install a special unit in the upper part of the heating system circuit, which will automatically release air from the pipeline.If the body of the hydraulic machine vibrates strongly when pumping the coolant, this may indicate that the bearing that ensures the rotation of the impeller is badly worn out. Repair of a circulation pump for heating in this case consists in replacing a worn bearing.End graphite bearing of the "Grundfos" pumpAmong the reasons for the discrepancy between the fluid pressure and the standard values at the outlet of the centrifugal pump are the following.

The impeller is rotating in the wrong direction.

The phase conductors in the terminal box are incorrectly connected (with three-phase connection).

The viscosity of the heating medium used is too high.

The filter installed on the suction line is clogged.

The specified issue is corrected according to the cause that caused the issue.The causes of such a malfunction may be incorrect connection of the phase wires in the terminal box, bad or oxidized contacts in the safety assembly of the device.To repair the electronic component of the pump, you will need basic knowledge of electrical engineering.This is another nuisance that occurs quite often during the operation of such equipment. Why is the circulation pump heating up? The reasons may be different, but such a situation always indicates that your equipment is operating under increased load.Thus, many situations in which the circulation pump does not work or does not work correctly can be dealt with on your own, without resorting to the services of qualified specialists and without purchasing expensive spare parts and components for repair.

DIY circulation pump repair

Circulation pumping devices are very popular with private house owners and summer residents.The range of pumping equipment is quite wide, but the general principles of the device are the same. Such equipment can stop from minor breakdowns. Take a broken pump to a service center? It costs money, and in many regions there are simply no service companies. Therefore, the household owner of the house must know how to repair the circulation pump with his own hands.

To understand how to independently disassemble, maintain, repair a circulation pump, you need to know its structure. Such equipment is arranged as follows:

all units and mechanisms are located in the case, which is made of steel (mainly stainless), aluminum and other alloys;
inside the case is located rotor motor;
a wheel with wings is installed on the rotor - impeller, which is usually made from technical polymers.

Circulation pump device

After turning on the electrical circuit, the engine begins to rotate the rotor with the impeller attached to it. Liquid is supplied to the central part of the pump. The blades rotate and throw water or other coolant to the outside of the housing. Under the action of centrifugal forces, the liquid moves and enters the pump outlet.

Circulation pump in the heating system

There are currently two main types of circulating pumping devices on the market.

"Wet type" - in such equipment, the rotor is completely immersed in the pumped liquid. A significant advantage of this configuration is the cooling of the rubbing and heating parts by contact with the liquid. Such equipment works quieter and costs less. When installing it, it is necessary to maintain the position of the housing specified by the manufacturer (usually horizontal), since the rotor must be completely immersed in the liquid. Also, "wet" devices are easier to maintain, but very sensitive to the lack of fluid in the system (running "dry" can quickly damage the pump).
"Dry type" - in such devices, the pump motor is placed in a separate compartment or module, and the transmission of torque to the rotor is carried out through the drive device (clutch). Dry-type pumps are more efficient, but also have a more complex design. A dry pump can operate without damage and no fluid is present in the system, but doing so will result in increased wear on the drive.

Also circulation pumps can be divided into types according to the type of execution:

monoblock;
console, consisting of separate blocks.

In order not to disassemble and repair your equipment once again, it must be properly operated.

Never run the pumping device without liquid in the heating pipes.
Keep the volume of water pumped by the pump within operating specifications. Excess or decrease in the volume of pumped water, in relation to the indicators specified in the technical passport, is unacceptable. If the pump is designed to pump from 5 to 100 liters of water per hour, pumping 3 or 103 liters of water will wear it out a lot.
If your pump has been idle for a long time, turn it on for about a quarter of an hour once a month. This will help prevent oxidation of moving parts and subsequent damage.
Maintain the temperature in the water supply lines no more than 65 degrees. If the temperature of the coolant is exceeded, sediment can damage the moving parts of the pumping device. Water temperature over 65 degrees (for example, 70-80 ° C) contributes to the rapid wear of the equipment.

From time to time, preferably at least once a month, it is necessary to carry out an external examination and check the quality of your circulation pumping device.

Pump device option

Turn on the pump and check that there are no abnormal noises and excessive vibration during operation.
Check the pressure of the heating medium delivered by the pump. It must correspond to the indicators stated in the technical passport.
Make sure there is no excessive heating of the electric motor of the device.
Check the threaded flanges for grease and restore if necessary.
Make sure there is a ground connection between the pump body and the corresponding terminal.
Inspect the pump from all sides and make sure there are no leaks. Typically, such vulnerabilities are the interface between the pipeline and the pump housing. Check the level of tightening of the bolts and the normal condition of the gaskets.
Examine the terminal box. All wires must be securely fixed. The presence of moisture in the unit is unacceptable.

In circulating pumping devices, there are a number of typical malfunctions that you can eliminate yourself. Each block will describe the symptoms of a malfunction, its causes and DIY repair steps.

The reason may be oxidation of the motor shaft during prolonged pump downtime... Troubleshooting instructions.

Turn off the power to the equipment.
We remove water from the pump and pipelines adjacent to it.
Remove the screws securing the housing and the motor.
We dismantle the electric motor complete with the rotor.
We turn the rotor by hand, or with a screwdriver, resting against the working notch.

The next reason for such a malfunction may be ingress of foreign objects.

Turn off the power to the equipment.
We remove water from the pump and pipelines.
Remove the screws securing the housing and the motor.
We remove the foreign object.
We protect the inlet pipe of the pump with a mesh filter.

Also, the reason for the lack of rotation can be lack of power supply... To do this, we check with a tester that there is power at the terminals in the box and that the electrical wires are connected correctly.

The main reason for such a malfunction can be lack of power supply or insufficient voltage in the network... To eliminate it, it is necessary to check the voltage at the terminals with a tester and, if necessary, the correct connection of the device to the power supply.

Many electric pumps are fitted with a fuse. In case of power surges, it burns out and requires replacement.

This can be caused by limescale deposits between the stator and the rotating rotor. The malfunction is eliminated by dismantling the electric motor and cleaning it from limestone deposits.

The cause of such a malfunction may be the presence of air in the pipeline of the heating system. To eliminate it, it is necessary to release air from the pipes. For automatic venting, it is recommended to install an automatic unit in the upper pipe segment.

If a sharp noise is accompanied by increased vibration, then it is recommended to increase the pressure at the inlet to the pumping device. Insufficient head can be compensated for by an increase in the level of the coolant in the system.

The cause of such a malfunction is usually a strong wear of the bearing that ensures the rotation of the impeller. The malfunction is eliminated by replacing the worn bearing.

The cause of such a defect may be the wrong direction of rotation of the wheel with blades. The reason for this phenomenon is usually an incorrectly connected phase when three-phase equipment is connected.

Also, a decrease in head can be caused by an increased viscosity of the coolant, then the impeller encounters too much resistance. To eliminate it, it is necessary to clean the filter on the inlet pipe from deposits, check the cross-section of the inlet pipeline and set the necessary pump adjustment parameters.

Most likely, the cause of such a malfunction may be the incorrect connection of the wires in phases in the terminal box. The fuse on your pump may not be tight enough. Remove it and clean the clips.

In order for your equipment to work smoothly all the cold season, it is necessary to carry out routine maintenance before the start of the heating season.

Check if the pump is correctly connected to the heating pipe network... The pumping equipment must be installed in such a place of the irrigation network where there is a minimum possibility of air congestion. It is rational to place it on the return line, in front of the heating boiler.
Before using make sure that all network connections remain tight... To prevent the gaskets from drying out, the inlet and outlet nozzles are covered with a preservative lubricant during a break in operation.
Check the condition of the filter in front of the pump inlet... Replace or clean if necessary.
Check if the device is properly connected to the power supply... Not only the tightness of the contacts on the terminal box, the serviceability of the fuse, but also the correctness of the phase connection and the value of the operating voltage in the network are checked. It is best to check these characteristics with a tester.
Before starting to operate the heating circulation pump without fail do a test run, which must confirm the complete tightness of the system and the serviceability of all its components and equipment.

If, during the test run of the equipment, shortcomings of the pumping device are revealed that cannot be eliminated without dismantling and disassembling it, you will have to perform the following operations.

At the preparatory stage, the pumping equipment is de-energized. When installing the pump, a bypass is built into the pipeline system - a bypass heating pipe. It is closed during normal operation. For long-term repairs, it may be necessary to connect an additional pumping device to the system.
Unscrew the shut-off valves securing the pump, remove it.

Dismantling the pump before repair is especially necessary, your heating pipelines are made of metal-plastic. Over-the-air repairs can damage such pipes.

Pumping equipment diagram

With a serious repair of pumping equipment, it is necessary not only to dismantle it, but also to disassemble it. It is performed in the following sequence.

The circulating pump cover is fixed to the body with bolts. These can be Phillips or Allen screws. During operation, the bolts can "stick". This problem can be solved with the help of specialized aerosols, also called "liquid key". It is applied to the bolt and can be easily unscrewed after a few minutes.
Remove the cover. Before us is a rotor with a rotor fixed on it with a wheel with blades. Usually it is held on by clips or bolts. Remove it and you will get access to the "insides" of the pumping equipment.
Inspect the pump, identify the faulty unit and replace it.

It is necessary to carry out self-repair of circulation pumps only after the expiration of the warranty period or if it is impossible to obtain qualified technical assistance. A number of pump assemblies are quite difficult to find commercially. This is usually caused by the trade policy of the manufacturers, so be prepared for the fact that in some cases it is cheaper to purchase new equipment rather than fix broken ones.