In detail: do-it-yourself Kalpeda pump repair from a real master for the site my.housecope.com.
Calpeda MXV pump design
Calpeda MXV in-line vertical multistage pumps with suction and delivery bells have the same diameter and are located on the same shaft (in-line design). The Calpeda MXV pump is equipped with a thrust bearing as well as a hub connection for use with any standard V1 motor. As a rule, the guide sleeves are lubricated with the pumped liquid and are resistant to corrosion.
Application of pumps
Universal multistage vertical pumps Calpeda MXV are used for pumping hot and cold clean, non-aggressive, non-explosive liquids that do not contain solid, abrasive, fibrous impurities. The design allows these pumps to be mounted both vertically and horizontally. The same diameter of the inlet and discharge pipes, as well as their coaxial arrangement, allows the Calpeda MXV series pumps to be installed in a pipeline rupture.
Calpeda MXV in-line vertical multistage pumps can be used equally for industrial and domestic purposes.
Operational limitations
- Liquid temperature from -15 ° С to + 110 ° С.
VIDEO Motor power designation
The circulation pump is often used in individual heating systems in private houses. This equipment makes it possible to efficiently run the coolant along the circuit, which ensures a stable temperature throughout the room. The quality of heating depends on the operation of the device.
Video (click to play).
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.
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.
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.
What breakdowns can occur and how to repair the circulation pump with your own hands? Let's figure it out.
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.
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.
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.
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.
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.
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 rotates 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.
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.
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.
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 on the modern market, like other models, can be ordered in many online stores.
VIDEO
Among the manufacturers of equipment for pumping or supplying liquids, Calpeda is also one of the first positions. It is an Italian manufacturer of such equipment and pumps. Their products meet international standards and are manufactured using the latest technologies. This ultimately makes it practical, reliable and economical.
Pumps series NC3 from Calpeda are threaded, three-speed circulators. The design of which is based on a multi-row design with the same diameters of the suction and delivery sockets. They are both located on the same shaft.
Brass connections with thread pumps are the main option for their production. But some examples of such pumping equipment provide for their execution from cast iron. At the same time, the body of the NC3 series is bronze. The impeller is made of composite materials. And the shaft is usually ceramic or stainless steel.
Purpose of pumps Calpeda nc3 pump clean liquids. In which there are no abrasive particles at all. They are not designed to work with liquids containing corrosive substances. Therefore, they are used in household systems. They can supply water and ensure its circulation in heating circuits used for heating. Or installed in air conditioning, cooling, sanitary hot water systems.
The set of pumps Calpeda NC3 includes two-pole electric motors with asynchronous rotation of the rotor, single-phase, with a manual rotation switch for three positions. The frequency of which is 50 Hz. However, they are equipped with an IP 44 protection device with H-class insulation.
Distinctive feature of the pumps Calpeda nc3 - high strength characteristics and reliability, along with ease of use and economical operation. But there are also technical recommendations of the manufacturer, which must be observed for the correct use of the equipment.
The pumps must not operate at ambient temperatures over + 40oC. The pumping of liquids with temperatures below +5 oC and more than +110 oC is completely excluded. The pump casing of this type is designed for a final pressure not exceeding 10 bar. Compliance with these rules will ensure long-term use of the pump without replacement or repair.
The Italian company Calpeda, a manufacturer of pumping equipment and pumps, is recognized for its product reliability. Calpeda pumps are characterized by their durability and ease of use. New development of the Calpeda company in the field of domestic circulation pumps - type Calpeda NCE. A distinctive feature is high energy efficiency. Purpose - pumping clean and hot liquids.
The Calpeda NCE pump is a high efficiency design, permanent magnet synchronous motor coordinated by an inverter. This design made it possible to ensure functional parameters in household heating systems. The standard design is brass threaded connections, but cast-iron variations of the product are available on request.
A distinctive feature of the Calpeda Calpeda NCE circulation pumps is a high level of energy efficiency and, despite this, a fairly low level of energy consumption. Among other things, this type of pump has a very compact size, and the noise level during operation is surprisingly low. This functionality has expanded the scope of the pump application.
The design includes a self-cleaning stator chamber. The Calpeda Calpeda NCE pumps are equipped with permanent magnet synchronous motors. The motors have variable speed with a frequency of 50Hz. Also, the motor has a H-class protective insulation and an IP 44 protection device. The liquid temperature, at which the normal functionality of the pumps is guaranteed, varies from 2 to 95 ° C. If the ambient temperature exceeds 40 ° C, the operation of the pumps is not recommended. The maximum allowable pressure inside the pump casing is 6 bar.
With such excellent technical characteristics, high energy efficiency, Calpeda NCE circulation pumps are reliable and safe designs. Taking into account the performance of the motor, the use of electronics, an optimal operating mode has been achieved pumps Calpeda NCE .
Distinctive advantages over similar samples:
A class of energy efficiency.
Reduced energy consumption.
Extensive field of activity.
Curves n in the working area.
Reduced noise level.
The best duty point for the pump to operate is near the point of maximum efficiency shown on the performance graph. It is important to check the suction value against the NPSH graph to avoid cavitation.
Yes, with the following characteristics:
The suction should not exceed the specified value;
There must be a minimum water flow to prevent overheating of the fluid and damage to the mechanical seal and / or other pump components;
The efficiency of the pump in this area of work is poor.
If the liquid has density, viscosity and / or vapor pressure values that differ from the corresponding water parameters, correction factors must be entered to take into account changes in capacity, head and energy consumption. In such cases, you should contact our office.
Yes, if the engine is at the top.
Since the set pressure on the pressure switch exceeds the maximum pressure developed by the pump.
The maximum permissible number of starts per hour, at regular intervals, depends on the power and type of the electric motor. For the exact values, refer to the operating instructions for the specific pump.
The pump parameters exceed the parameters of the water supply system in which it is installed;
Lack of lubrication in moving parts of the pump, such as bearings;
The rotation speed is too high;
Incorrect supply voltage;
Error in adjusting the elastic coupling;
High density of the liquid.
This can happen after a long period of inactivity due to internal oxidation. To unblock small pumps, using a screwdriver, turn the motor shaft, which has a special groove on the fan side. For large pumps, turn the shaft or flexible coupling with any suitable tool.
There is no power in the network;
The power switch is broken or open;
The power cable is damaged or defective;
Fuses are defective;
The capacitor is damaged (for monophase motors).
The relay contacts are damaged;
The fuse has blown;
The pump is blocked or difficult to rotate due to friction;
The pump is running at the duty point with overload.
This can be caused by worn pump components such as impeller or blockage.
There is air in the pump and suction pipe;
The pump does not contain enough water;
Air can be sucked in through the bottom valve, drain / filler plugs or pump socket seals;
The foot valve is not completely submerged in the liquid or the valve is clogged;
The suction lift is too high compared to the pump capacity;
Wrong direction of rotation of the electric motor.
Suction or delivery valve closed;
The bottom or non-return valve is clogged;
Insufficient suction capacity;
Air pockets in the suction line.
The diameter of pipes and pipe fittings is too small, which leads to an excessive drop in pump performance;
The impeller is clogged, its internal channels are clogged;
The impeller is worn out due to corrosion or broken;
The pump casing, impeller or other parts of the pump are damaged due to abrasive wear;
Gas in water or excessive viscosity of the liquid;
The foot valve and / or suction line is clogged;
The pump is too small;
Wrong direction of rotation of the electric motor.
The rotating parts of the pump are unbalanced, for example due to dirt or worn bearings;
The pump and piping are not securely fastened;
The water flow rate is too low for this type of pump;
Cavitation.
The pipeline is leaking;
The bottom valve is not closed;
The pump is not adequately protected against water hammer.
Our branches in Russia
The first Calpeda pumps were manufactured by the company of the same name in Italy in the 50s of the last century. Reliable technical characteristics, quality of products, a variety of areas of its application allowed the company to become one of the leaders in this field of production. Pumping equipment of this brand can be used in various areas of production and everyday life. Their technical characteristics vary in terms of engine power, size, type of housing, installation method. The number of types of pumps produced by the company reaches 2000 and more. Their power ranges from 0.33 to 200 kW. There is a division according to the scope of use, the type of pumped liquid. Calpeda pumps are capable of handling salt water, sand impurities, flammable or viscous (oily) liquids. A separate class of such equipment is used to raise water from wells.
Employees of our company carry out repairs of Calpeda pumps in Moscow. The repair is carried out in compliance with all the necessary quality indicators; original components and reliable materials are used.
The manufacturer supplies the market with samples of high quality goods with a high margin of safety:
body made of corrosion-resistant metal (stainless steel or cast iron, depending on the type of pump);
There are a number of reasons that can lead to a breakdown of such a pump:
its inclusion on the surface (without liquid), the consequence of which is a water hammer;
Our specialists change bearings, stuffing box packing, flange seals, carry out many other activities, up to the restoration of electronic units and control panels for complex pumping stations. The company provides repair of low-power devices and equipment of pumping stations for extinguishing fires, filling large pools.
For the buyer of equipment of this brand, it is important to make the right choice of the required pump model, to ensure its competent installation and maintenance by reliable specialists.
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 circulating 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 device 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 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.
Pumps with "dry" rotor 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, 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 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 casing of the circulation pump looks like 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 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" 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 reasons for 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.
VIDEO
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 tapping 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.
VIDEO
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.
VIDEO
DIY circulating pump repair - step by step instructions
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 starts 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 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.
Glandless pump design
Video (click to play).
To learn more about the technologies for repairing circulation pumps, watch the training video.
