DIY circular pump repair

In detail: do-it-yourself repair of a circular pump from a real master for the site my.housecope.com.

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 pump

The 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).

Video (click to play).

Circulation pump design

The 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" type

For 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.

Dry rotor pumps are installed in separate boiler rooms and are used in systems that heat large areas

The 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, an 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 fluid pressure 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 body 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 pump

The 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, disassembling the circulation pump may not be required: using a tester, they check the level and presence of voltage at the device terminals. 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 windings

In 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 housing of the hydraulic machine vibrates strongly when pumping the coolant, this may indicate that the bearing, which ensures the rotation of the impeller, is severely worn out. Repair of a circulation pump for heating in this case consists in replacing a worn bearing.

End graphite bearing of the "Grundfos" pump

Among 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.

Before the start of the heating season, in order not to subsequently face the failure of the circulation pump and its repair, it is necessary to properly prepare the device for a long period of intensive work.

It is necessary to check the correctness of the pump insertion into the pipeline, referring to the arrow on the housing and the impeller rotation indicator. When installing a new pipeline for installing a circulating hydraulic machine, it is better to choose a section directly in front of the boiler, where the risk of air congestion is minimized.
Grease must be present on gaskets and pump nozzles to prevent drying out.
Check the condition of the suction strainer and, if clogged, thoroughly clean it.
It is also required to evaluate the correct connection of the pump to the power supply, for which a tester is used.
Check the tightness and reliability of the hydraulic machine connections.
It is necessary to perform a test run, the results of which will show whether your equipment is ready for the heating season.

Before disassembling the circulation pump, if it becomes necessary (for example, during repairs), it is necessary to disconnect it from the power supply and remove it from the pipeline by unscrewing all fastening threaded elements.

After the pump has been dismantled from the heating system, you can start disassembling it:

The cover is removed, which is fixed to the pump body with special bolts.
After removing the cover, the impeller is removed from the inside of the pump.

After that, access to all internal parts of the pump will be provided, they can be inspected, cleaned or replaced with new ones, if necessary.

The sequence of disassembling circulation pumps of various models for repair is very well demonstrated by videos that are easy to find on the net.

Do-it-yourself heating circulation pump repair is a rather difficult task. To do it correctly, you need to understand the design and features of such equipment.Pump circulation devices, often called pumps, are popular among owners of summer cottages, private housing construction, apartments with autonomous heating, and country cottages. The choice of such devices is quite large these days. Circulation pumps differ from each other in technical characteristics. However, their overall design remains unchanged.The device of the circulating pump is as follows: the device has a housing made of carbon steel, stainless steel or strong aluminum-based alloys. The pump is made elongated horizontally. An electric motor with a rotor is installed in the housing. The motor power is quite high. It varies depending on the equipment model. The rotor is equipped with an impeller made of ultra-strong polymer compounds or steel. It is equipped with special blades. They bend in the opposite direction to the rotation of the wheel.An electric motor with a rotor is installed in the pump housingIn some cases, the pumping equipment assemblies are not enclosed in one casing, but in several separate blocks. Such pumps for two- and one-pipe heating systems are called console. There are two types of pumps - wet and dry. The first of these devices are made in the form of a monoblock. They have an affordable cost, they work almost silently. Dry pumps are in most cases made of cantilever type. The electric motor is installed in a separate unit. The rotor of the engine is rotated through a special coupling. Dry pumps are structurally more complex due to the presence of a drive mechanism.The principle of operation of the described devices:

After starting, the electric motor starts to rotate the impeller on the rotor.

The liquid enters the central part of the pump device.

The blades on the impeller throw the used heat carrier (oil, water) to the outside of the housing.

Centrifugal force begins to act on the liquid. Due to this, the coolant enters the outlet pipe.

After all these operations, a drop in pressure is observed in the chamber, due to which the pump receives another portion of the pumped liquid. This ensures the continuity of the pump.Repairing circulation pumps requires dismantling and (usually) disassembling them. Removing the pump is easy. It will be necessary to de-energize the device, close the bypass heating pipe - bypass, if one was installed, and then carefully unscrew all the shut-off valves that fix the pump. Then you can safely dismantle the pump.Disassembling the device will have to tinker a little longer. But this operation is quite feasible. Stock up in advance with a hexagon, a Phillips screwdriver, a liquid wrench - a special aerosol composition that is applied to fasteners that have become stuck during operation and allows you to unscrew the latter without difficulty. If the pump has not been disassembled for a very long time, the use of the specified aerosol is mandatory. How to disassemble a circulation pump?

Follow the instructions below:

1. Unscrew the bolts that secure the mechanism cover. Don't forget to use a liquid key!
2. Remove the cover. The rotor is located under it. Its fastening is most often done with bolts. Less commonly, special clamps are used.
3. Unscrew the bolts (release the locking elements).

Disassembly of the pump is complete. All units and individual parts of the circulation device are located under the rotor. It is not necessary to disassemble the pump down to the bolts. First, you should decide which element is out of order, and only then remove the specific part that needs to be replaced or repaired. If the entire pump needs to be replaced, simply dismantle it. It is not necessary to completely disassemble the mechanism. Remove the equipment that has failed. Install a new one in its place.

Pumps from different manufacturers have been shown to have the same design. Therefore, their faults, as a rule, are the same. Many users are faced with the fact that the circulation device starts to hum when starting, but the rotor does not rotate. A similar problem occurs due to:

Incorrect connection of electrical wiring or lack of power on the terminals of the pump. The problem is solved by checking the power supply with the tester and reconnecting (correct!) Cables.
Oxidation of the motor shaft. This phenomenon is most often observed in cases where the pump has not been used for a long (several years) time. Do-it-yourself repair in such a situation will be as follows - turn off the power, drain the water from the pipeline and the pump itself, disassemble the electric motor (remove the cover and rotor). Now the main thing. You need to take a screwdriver and turn the rotor all the way into the working notch. The operation can also be performed by hand if the mechanism rotates without difficulty.
Foreign objects falling into the mechanism. You need to disassemble the cover and rotor. Remove foreign body. After that, be sure to replace the mesh filter. As a rule, a foreign object will disable it.

Circulation device in the heating system

If the pump starts up normally and then stops, it is most likely not properly connected to the terminals. Check it out. Make a proper connection if necessary. Another reason for the described breakdown is the appearance of scale between the rotating units of the mechanism. Disassemble the unit, remove the existing limescale, lubricate the joints of all parts with oil. Sometimes the pump stops due to a loose fuse. It is necessary to dismantle this element and clean the clamps securing it.

A defective fuse is often the reason the pumping equipment will not turn on.

Check the terminals, measure the voltage at the terminals with a multimeter. If the fuse is broken, replace it.Such situations are often encountered due to power surges in the power grid. If you do not want to constantly put a new fuse, connect a stabilizer to the equipment. It will reliably protect the system from voltage surges.

The pump may make a loud noise when starting up. This signals that air has entered the closed circuit of the circulating system. They prevent such a phenomenon by installing specials. node in the pipeline. Such a small element eliminates the possibility of air congestion in the system. If a special assembly has not been installed, you will have to purge the pipeline. Severe noise, as well as perceptible vibration, sometimes occur due to wear on the bearing, which is placed on the impeller wheel. Disassemble the housing of the unit, analyze the condition of the bearing, replace it with a new one if necessary.

Circulation pump repair

When the pump does not provide the required pressure of the coolant, the reason lies in the wrong (in the opposite direction) rotation of the impeller. This problem only occurs when pumping equipment is connected to a 380-volt mains supply. The solution is to connect the wire to the correct phase. Also, the head decreases with an increase in the viscosity of the coolant. In situations like this, the wheel encounters high resistance and cannot fulfill its function. You will need to remove the strainer from the pump, clean it or replace it.

As you can see, it is quite possible to repair the circulation pump with your own hands. Of course, when it comes to common breakdowns. In other cases, it is better to entrust the restoration of the pump to the specialists of the service centers.

Proper handling and regular maintenance of pumping equipment eliminates the need for repairs for many years. Consider the following when operating your pump:

Do not start the pump if the piping is not filled with thermal fluid.
Turn on the circulation equipment at least once a month for 15–20 minutes. Prolonged downtime of the pump is guaranteed to lead to malfunctions of its individual components and mechanisms.
Follow the manufacturer's recommended volume of pumped liquid. If the device is designed for 100 liters of coolant per hour, it is forbidden to pump more water through it.
Before the start of the heating season, check the system for leaks, the correct connection of the circulation unit to the mains. Carry out test runs of the pump to ensure that there is no vibration or abnormal noise.

Regular maintenance of the circulating pump is also of great importance for the stable operation of the circulating pump. You can do this procedure yourself. You need to make sure that the wires leading to the terminals are securely fixed, that there are no leaks in the unit, that there is a ground connection between the terminal and the pump body. You also need to lubricate the threaded flanges every 1–3 months and tighten all the pump bolts. Do not forget about the preventive measures described, and then the circulation unit will serve you without accidents for decades.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 pumpCompliance 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 testingModern 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.
to the menu ↑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 attached, 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.
to the menu ↑

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 (coupling). Dry-type pumps are more efficient, but also have a more complex design. A dry pump can operate without damage and without fluid in the system, but this operation 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 without interruption during 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 branch pipes 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 clamps 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.