Submersible pump for a well. How to choose the right pump and install

A submersible pump is a device for pumping water, which is placed directly in aquatic environment. This equipment is used in wells and wells for organizing water supply at home, as well as in systems autonomous sewerage for pumping liquid household waste. When purchasing such a device, it is important to understand its principle of operation and operation features. After all correct use submersible pump significantly extends the life of the device and reduces the likelihood of unscheduled repairs.

Submersible pumping equipment is classified according to the principle of operation (centrifugal and vibration) and by scope.

At the heart of the design centrifugal pumps there is an electric motor, on the shaft of which the impeller is fixed. In the process of rotation, the impeller blades create centrifugal force, as a result of which the water rises.

The vibration device has a simpler device. Here, an electromagnet with a vibrator is used, due to the reciprocating actions of which a pumping effect is created and water begins to be sucked through the check valves of the device.

Important! The submersible pump can only be used in water. Dry running protection is additionally applied to avoid accidental idling.

Scope of application

Submersible pumps are divided into 4 classes depending on the scope of application:

• Downhole

Given the small diameter of the well casing, such a device has an elongated cylindrical shape with a diameter of about 100 mm. It can be used at a sufficiently large depth, and the water lifting height in some models is 60 m.

• Well

Such a device is used at shallow depths for pumping water with a low degree of pollution. It should not be located close to the bottom because of the risk of sediment rising and rapid clogging of the filter.

• Drainage

As a rule, the use of a submersible drainage pump is associated with emergency and repair work such as pumping out water from flooded premises (basements, cellars), draining ditches, cleaning wells, etc.

• Fecal

A feature of this equipment is the presence of a grinder and a wide arrangement of flow channels for pumping liquid household waste from cesspools without the risk of clogging.

The drainage pump has a wide range of applications

What to look for when operating a submersible pump

The submersible apparatus is used in rather harsh and specific conditions. Therefore, some aspects of its operation should be given Special attention.

Technical specifications

The main indicators in technical terms are the power and performance of the equipment. The passport for the device must indicate the maximum column of water. The maximum immersion depth of the pump depends on this parameter.

Note. The performance of the equipment should not exceed the flow rate of the well or well, otherwise the resource of the source can be exhausted very quickly.

When using a downhole tool, the correct dimensions to prevent the possibility of jamming. To do this, its diameter must be at least 10 mm smaller than the diameter of the well casing.

Mounting Features

Because all submersible pumps use electrical energy, before installing and operating them, it is necessary to carefully check the integrity of the insulation. Particular attention should be paid to the cable and the place of its connection to the device.

When lowering the device to a depth, you should use a reliable reinforced cable that will hold it throughout the entire period of operation and will allow you to get equipment for maintenance or repair at any time. Borehole and well pumps are usually located 1 meter from the bottom, while drainage pumps are lowered directly to the bottom.

Fastening the submersible pump to the wellhead

Scheduled Maintenance

During the course of any technical device it is important to carry out scheduled maintenance, which allows you to ensure a long maintenance-free period of operation. In this regard, submersible pumping equipment is no exception. Frequency of maintenance and list of performed preventive measures indicated in the technical data sheet of the device.

Important! Without technical skills and special tools, it is categorically not recommended to disassemble the device. For these purposes, it is better to invite a specialist.

When using a submersible pump for water supply at home, the owners often have questions that only professionals can answer.

• The well is emptying quickly

Reason: wrong calculation required performance device. Such a problem often arises during self-drilling, when the well flow rate is determined approximately or not determined at all.

Solution: reduce water flow or install a pump with a lower capacity.

• Water comes with sand

Reason: capture of sand particles from the bottom of the impervious layer.

Solution: clean the inlet filter and raise the device by 0.5-1 m.

• Idle protection trips frequently

Reason: water in a well or well falls below the permitted level. One of the most common mistakes made by non-professionals is to install the pump according to a static rather than a dynamic water level.

Solution: install pumping equipment according to the dynamic water level.

• Decreased pump performance

Cause: Internal device failure.

Solution: it is necessary to disassemble and, if necessary, repair the device. Centrifugal pumps have the most common cause a decrease in performance is a breakdown of the impeller, and for vibrating ones, the loss of elasticity of the rubber piston.

Not correct operation usually causes breakdown of pumping equipment

Before using the submersible pump, it is necessary to read the instruction manual, paying special attention to the installation and maintenance sections of the device. In the event of a malfunction, it is better to leave attempts self repair and contact the experts immediately.

A submersible pump is one of the main devices for supplying water to a house. The equipment is selected based on the needs of the user and the parameters of the water supply source. Installation of a submersible pump can be done by professionals and independently. How to mount the equipment on your own, this article will tell.

Types of submersible pumps

By purpose, all submersible pumps can be divided into three large type:

1. . The equipment is capable of lifting water from great depths and transmitting it over long distances;

1. wells. Submersible pumps designed for installation in a well have a lower power, which affects the head and performance issued by the device. Outstanding representatives well pumps are devices of the type Kid and Brook;

1. . Used for pumping contaminated water from pools, basements, drainage wells.

Installing a submersible pump yourself

The installation of a submersible pump depends on the type of equipment, depending on the place of its future placement.

Installing a pump in a well

To install a submersible pump in a well to provide country house drinking water, necessary:

1. lay a water pipe that will connect the equipment in the well with plumbing fixtures located inside the building;

Depth water pipes should be more than the depth of soil freezing in the region.

1. bring a feeder to the well electrical cable, with which the submersible pump will be connected. The wire can be laid on the surface of the earth in a specialized protective sleeve or together with water pipes. In the latter case, the cable will be less susceptible to technical damage;

1. on the upper ring of the well, attach a bracket to hold the pump. If the depth of the water supply source is more than 20 - 30 m, then for the convenience of removing the pump, a special metal formwork can be made. For shallower depths, the simplest bracket is suitable, to which the pump will be fixed with a metal cable;

1. the pump is connected to the plumbing system;

If the equipment is not equipped with a check valve that prevents the passage of liquid in the opposite direction, then it is recommended to mount the device additionally.

1. power supply is connected. It is desirable to attach the cable to the pipes located inside the well with insulating tape. This will avoid any damage that could disable the pump;

1. the prepared system is lowered into the well to the required level and fixed on the holding device;

The first start of the pump must be controlled. At the same time, the correct operation of the device and the tightness of all are checked.

Installing a pump in a well

The pump is installed in the well according to the principle similar to the installation of the pump for the well:

1. at the first stage, water pipes are laid to the well and consumption taps;
2. the pump is connected. A drainage pipeline and a power cable are attached to the equipment. The connection diagram of the submersible pump must be included with the device;

1. all wires and pipes are fixed with insulating tape to prevent damage and entanglement;

1. the prepared structure is lowered into the well to a certain level;
2. the pump is fixed on the head.

The head of the well is not only a holding device for the pump, but also protects the water supply source from various items, leaves, other debris. The caption is also link between the pump and the house's water supply.

1. a drainage system is connected to the head.

The correctness of the work performed and the commissioning of the device are checked. If you have problems installing or connecting the equipment, you can get advice from professionals on how to connect the submersible pump correctly. For this, it is recommended to contact the equipment manufacturer.

You can learn more about the process of installing the pump in the well by watching the video.

Connecting the accumulator

If desired, a hydraulic accumulator can be connected to the pump. Connecting a submersible pump to a hydraulic accumulator will allow:

• prolong pump life. A reservoir of water is created in the accumulator. When the sanitary ware is turned on, water is primarily consumed from the tank and only when the critical liquid level is reached, the pump turns on. One-time activation of the pump satisfies the needs of users and refills the tank. Thus, when using a hydraulic accumulator, the frequency of switching on pumping equipment is reduced, which leads to an increase in the period of operation;
• reduce the number of pressure drops due to the use of several taps at the same time;
• protect the water supply system from hydraulic shocks that can occur when the pump is turned on.

The diagram for connecting the accumulator to the submersible pump is shown in the figure:

The accumulator cannot be installed without a pressure switch, which is triggered when a small liquid level is reached in the tank.

Installing the pump in a well or well is quite simple. The main thing is to choose the right equipment and prepare everything in advance Additional materials in the form of connecting fittings, check valve, additional electrical wires and so on.

To ensure the water supply of summer cottages and household plots, as well as small farms, household electric pumps. The universal submersible pump Malysh is rational to use at facilities with low water consumption. The product lives up to its name compact size and light weight, not exceeding four kilograms. The engine of the unit is able to operate from a home electrical network, the voltage of which is 220 V. Despite the modest power indicators, the equipment provides quite good pressure water, which depends on the height of its supply.

Scopes of the submersible pump Malysh

Inhabitants countryside and summer residents use Kid's water pump various purposes, namely:

• provide water to both residential and non-residential facilities;
• supply water to gardens and summer cottages;
• include in automatic systems watering, facilitating the care of horticultural crops;
• provide spraying of shrubs and plantings using spray nozzles;
• pump out water.

Important! These models of pumps should not be used for pumping heavily polluted water, as they are subject to rapid wear of the parts of their structures, which leads to a decrease in the service life.

This pumping equipment, manufactured Russian manufacturers, has become widespread due to its reliability, affordable cost and unpretentiousness in operation. The lack of editing also played a role in this. After all, the pump is ready for operation immediately after immersion of its body in water.

Main technical characteristics

• pump performance Kid is 432 l / min without lifting water;
• cable length varies from 10 to 40 meters;
• the diameter of the intake pipe must be at least 80 mm;
• water intake depending on specific model may be upper or lower;
• rise in water pressure to a height of up to 40 meters;
• motor power is not more than 250 watts.

Important! This pump is capable of pumping and lifting water not only from wells with a diameter of more than 80 mm, but also from open reservoirs and wells.

Installation of a household submersible electric pump Malysh

The figure shows schematically how the Malysh deep-well pump should be placed: in a well and in a well with a filtration casing.

Scheme of installation of a vibration submersible pump Malysh in a well or in a well

The principle of the device and basic repair

The device of the Malysh pump is based on the properties of electromagnetic oscillations, which are transmitted to the float valve, forcing the membrane to oscillate and thereby push water through. Via automatic device control of the engine operation is provided, which is turned off when overheated, as well as after pumping the entire volume of water.

Pump models may differ in the location of the suction holes. or after pumping all the water. It is preferable to purchase a Baby pump with an upper intake, since in this equipment the electric motor is located below, and therefore it cools better. The suction hole, located on top, does not capture silt deposits and other impurities from the bottom of the water intake. Such equipment can work without problems in the immersed state for a long time at a water level below the suction holes.

A similar situation will not be tolerated by models with a lower water intake. Therefore, their work must be monitored, not leaving the switched-on equipment unattended for a long time. When buying, it is advisable to choose models with thermal protection that prevents the engine from overheating. It is possible to repair the Baby pump with your own hands in case of replacing leaky valves and other minor breakdowns. It is necessary to resort to the help of specialists if the product has not expired the warranty period, as well as when replacing a burned-out engine.

Submersible pump Kid with top water intake and thermal protection

Properly selected power, careful operation and compliance with the recommendations given by the manufacturer allow you to prevent breakdown of the purchased pumping equipment.

Customers who are attentive to the operation of the pump are satisfied with its performance and give the most positive reviews. Pick up suitable model pump can be with the help of specialists who will help to install and connect it.

Life outside the city or in the private sector has its own characteristics. Sometimes you have to deal with a shortage of water, and in some periods it becomes too much. A spring flood can play a trick on a basement by turning it into a reservoir. A pool, well or well also needs to be regularly cleaned of debris and pollution. Using the drain pump - effective way solving a number of "water" problems. The main thing is the correct operation of the equipment.

The principle of operation of pumps of this type lies in the name itself: to drain, that is, to extract excess moisture. In wetlands, near bodies of water or in climatic zones, where heavy rainfall regularly falls, to drain the soil, they construct drainage systems.

The pump is the final link. The task of the equipment is, if necessary, to pump out water if it does not drain naturally into storm sewer. At home and Everyday life drainage equipment is used:

• when eliminating the consequences of accidents in utility and house networks in the private sector;
• accumulation of flood, ground or rain water in basements and basements;
• for cleaning natural and artificial water reservoirs;
• when arranging fountains, the equipment is used to supply water.

The question often arises whether it is possible to use drainage pump for watering. In some cases, a combination of functions is possible. For example, if there is a reservoir at a distance of several tens of meters or right on the site.

IMPORTANT TO KNOW: A feature of the drainage pump is the presence of crushers of solid particles and impurities of various diameters (up to 120 mm) depending on the power and characteristics of the equipment.

An example of the placement of a submersible drainage pump. The equipment is attached with a cable

Where are sump pumps used?

In a special group, fecal pumps are used for cleaning drain pits, household sewer installations or country septic tanks. The design does not contain a filter that does not allow solid particles to pass through. The pump is designed to handle liquids and soft solids only.

The body of the device is made of durable materials that are not susceptible to aggressive environments are carefully sealed. For ease of operation, the device is equipped with a special float. Depending on its position, the pump is automatically pumped out or stopped.

Water pumping

Even reliable waterproofing not always able to resist water element. Often to cellars and ground floors groundwater or flood waters. Able to deliver trouble and heavy rainfall.

It is worth being on the alert for property owners in lowland areas, near rivers, lakes, other bodies of water, swamps. Water can come into the house suddenly, and you need to meet it with a prepared drainage pump.

Even low-power equipment of 160 W is capable of pumping almost 5 cubic meters in one hour of operation. m of water and thereby save from a communal disaster and costly repairs.

The presence of a protective float makes the operation of the device more rational and contributes to long-term operation.

Water tank cleaning

Modern backyard or country cottage area often includes a body of water:

• artificial or natural pond, lake;
• swimming pool;
• well;
• well;
• irrigation pit.

Any of them periodically needs to be cleaned using drainage equipment. Lack of systematic care will lead to silting of the bottom, deterioration of water quality.

It is not uncommon for a pond to turn into a small swamp due to the formation of a cushion of sediments, and water flows out of a well filled with sand and clay.

In some situations, a pump is needed to pump out ground water threatening to flood the site.

IMPORTANT TO KNOW: Opinions vary on whether a drainage pump can be used for water supply. There is a high risk of clogging the water treatment system. Repeated filtration of water will be required, which leads to significant costs.

For the installation of an irrigation system using drainage equipment, it is better to use a source that does not contain significant impurities and significant contaminants.

Devices for pumping water are divided into two main categories: submersible and surface. Fecal pumps can be semi-submersible - the choice depends on the expected operating conditions.

Submersible pumps

The equipment is placed in water before use. Depending on the object, the pump is placed on the bottom (reservoir, pit). If a well or well is being cleaned, the mechanism is placed in a "suspended state", raised above the bottom by 0.5-1 m.

Devices differ in the principle of operation:

• centrifugal pumps are equipped with an impeller and vanes. During rotation, pressure is created in the peripheral part of the wheel, as a result, the liquid continuously flows into the pump;
• vibratory pumps pump water at the expense of oscillatory movements liquids, and pressure is created using tubing. The direction of water flow is controlled by a valve system.

Both types of pumps are reliable, but in some cases the use of vibration models is not recommended. Constant fluctuations cause the movement of the soil at the bottom of the well or borehole. Large insoluble particles do not pass through the filter, they settle on the bottom, which leads to silting.

Advantages:

• there is no need for installation;
• noiselessness;
• small dimensions;
• high performance;
• automated system controls and float protection;
• use of a drainage pump for irrigation.

Disadvantages:

• limited level of water rise - no more than 20 m;
• for Maintenance equipment must be brought to the surface.

An example of the operation of a well submersible pump. For the outflow of water, an outlet to the storm sewer is provided.

Surface pumps

The equipment is installed next to the cleaning object. Only a hose of the appropriate length is lowered into the water.

Advantages:

• ease of installation and dismantling;
• equipment is not placed in water, which causes more safe operation;
• float protection and automatic operation;
• ease of use.

Disadvantages:

• loud noise during operation;
• designed to work only with shallow objects and will not be suitable for a well.

Domestic surface pump small power operates from a conventional single-phase socket with a voltage of 220 V. For more powerful equipment, a three-phase connection and a voltage of 380 V are required

Features of operation of the drainage pump

Efficient operation drainage equipment is an important component of comfortable living conditions in the country or in country house. The durability and trouble-free operation of the device depend on how to use the drainage pump. Several simple rules:

• Avoid engine overheating. In submersible pumps, water acts as the coolant. The temperature of surface equipment must be controlled, but it is better to choose a model with a thermal relay.
• Be sure to use float protection. Operation of the pump at a low water level is fraught with failure.

It is also recommended to consider the performance factor. For household needs suitable for equipment with a pumping capacity of up to 180 l/min. This volume is sufficient even with severe flooding or removal of excess groundwater. If the risk of a significant rise in the water level is low, you can limit yourself to a small pump with a pumping volume of about 80-85 l / min.

However, the last word when choosing a drainage pump should remain with the professionals. Experts will recommend the most rational scheme of operation, advise how to organize an irrigation system based on drainage equipment.

For example, it is possible to draw water from a reservoir to irrigate a garden. But the correct algorithm of actions is often incomprehensible. Experienced craftsmen will help with a practical solution and the choice of the optimal equipment. You deserve a comfortable and carefree life.

Video: drainage pump for pumping and watering

For the organization of uninterrupted water supply of a country house, it is necessary to select reliable equipment. Depending on how the water intake will take place, a pump is selected. When constructing wells, one should responsibly approach the choice of a submersible pump.

Types of pumps and their features

Submersible pumps

To positive characteristics such pumping equipment include:

• Design features provide ease of installation and operation.
• The device is universal, as it can be used as a device designed for irrigation and water supply at home.
• The resource of the mechanism is designed for long-term trouble-free operation and does not require preventive care and maintenance.
• Reliable protection prevents damage due to power outages or lack of water. When the voltage in the network returns to normal, the pump will automatically turn on.
• Permanent cooling is carried out due to the presence of the equipment in the aquatic environment and the constant movement of water through it.
• Silent operation of the unit.

Installation submersible equipment undesirable near the bottom, covered with silt or sand.

Surface pumps

This class of pumping equipment has the following characteristics:

• Pumps are universal. The main criterion determining the choice of the pump is the diameter of the well.
• The performance and efficiency of the unit are at high level, which exceeds similar indicators of submersible pumps.
• Their use is limited by power and, accordingly, water intake can be carried out from a depth of no more than 6-9 m.
• The housing is not an absolutely hermetic structure, which necessitates the creation of protection against the effects of precipitation. For year-round operation of the equipment, it is necessary to install an insulated caisson or place it in a special room.
• The device has a small weight and compact dimensions.
• Mounting the pump on the surface makes it easier to control its operation, maintenance and repair, if necessary.
• It is possible to quickly dismantle the pump and move it.

Types of pumps and the principle of their operation

Submersible pumps

The purpose of submersible pumping equipment is to organize the rise of water from various reservoirs. It is characterized by the fact that in working condition it is located directly in the water. Constant exposure to moisture makes it necessary to use materials that are not prone to corrosion for its manufacture. Depending on the principle of operation, submersible pumps can be vibration and centrifugal.

Vibratory pumps

This implementation is the most economical. The simplicity of design and ease of maintenance of vibration-type pumps, as well as their affordable cost, make such equipment attractive to the consumer.

The reliability of the mechanism of equipment of this class is ensured by the exclusion of the use of rotating parts and bearings, each of which requires certain maintenance and performance monitoring. In addition, the degree of wear and heating of the equipment is reduced due to the absence of rotating components.

The operation of these pumps is based on the principles of the electromagnetic field. When current passes, a magnetic field is generated that has a variable character. As a result, the core is drawn in, which has a mechanical connection with the rod. The latter is connected to a rubber diaphragm.

As a result of these processes, the diaphragm is bent, which leads to the appearance in the chamber reduced pressure. Due to this, water fills this tank. Since the magnetic field in this case is variable, when the polarity changes, the core is pushed out in the opposite direction, and water enters the pipe, simultaneously blocking the opening of the inlet valve.

Centrifugal pumps

Equipment of this class is characterized by versatility, as it is used for pumping a variety of liquids, including those with aggressive properties. Structurally, the unit includes an engine, on the shaft of which there is an impeller equipped with holes. The presence of holes ensures the supply and outflow of fluid. The energy of rotation of the wheel is transferred to the fluid located in the space between the blades. Through action centrifugal force it is absorbed with the appearance of a pressure difference. The pump works continuously with the supply of water to the outlet pipe.

The design of centrifugal pumps can be self-priming and non-self-priming. Both types of pumping equipment are single-stage or multi-stage. The self-priming type of pumps has horizontal arrangement housings and are put into operation at the moment when the suction pipe is completely filled with air. On the other hand, for a normally self-priming pump to start working, it is necessary to fill the suction pipe with liquid. The difference between multi-stage units and devices with a single stage lies in the possibility of creating high pressure with the same performance.

Deep pumps

The purpose of deep pumps is to pump water from wells that have a considerable depth. By design, they belong to the centrifugal type of pumps, which have the ability to create high pressure at small sizes devices.

For more convenient placement in the well cavity deep pumps are made in the form of a cylinder with a large length (500-2000 mm) and a small diameter (no more than 100 mm). The material for their manufacture is usually stainless steel. The compact dimensions of the pump do not affect its performance. This was made possible through the use of original technical solutions leading to an increase in the cost of equipment. Installation of devices of this type requires the use of special equipment.

well pumps

This equipment is similar to that used in deep wells, but with the difference that their immersion depth is less. They are used for pumping water from wells, wells with shallow depth and other reservoirs. The device of well pumps makes it possible to pump water containing mechanical impurities.

The diameter of such pumps is larger than that of downhole equipment, which is an obstacle for their operation in narrow wells. Self installation they are not complex and quite accessible for implementation.

Installation of a submersible pump in a well

preliminary stage

Before starting the installation of a submersible pump, you should find out the characteristics of the well where it is planned to be installed, namely:

• its depth and diameter;
• water level: static and dynamic.

The concept of dynamic potential includes the volume of water that a well can pump in a given period of time.

The static water level indicates that minimum height to which the pump can lift liquid.
It is important to determine in advance the intensity of operation of pumping equipment. In the event of a constant need for water, it is recommended to supply electrical power in close proximity to the unit. Otherwise, it is enough to use an extension cord.

The pump requires a significant amount of energy to operate, so when long work the extension cord may overheat and be damaged. This situation is emergency and unsafe for humans.

Rules for installation and commissioning

Before installing a submersible pump in a well, it should be checked inner surface. The casing pipe must not be uneven or be bent or constricted. The presence of such defects not only significantly complicates the installation of equipment, but also reduces its service life.

If the difference between the diameters of the pipe and the pump is too small during operation, all deviations of the well surface will be reflected in the equipment. If the gap is too large, then this will lead to failure of the pump, as the cooling of its engine will be disturbed. Thus, the value allowed values clearance must correspond to the passport data of the equipment.

To suspend the pump, a nylon cord is used, which has a fivefold strength margin. In order to prevent suction of the knot, which serves for fastening, its tying is carried out at a distance of at least 100 mm from the location of the suction holes, and the ends are melted. With a small immersion depth of less than 10 m, it is necessary to provide an additional suspension made of springy material. This will make it possible to dampen the resulting vibration.

The use of metal wire or cable as a suspension is not allowed, as this can lead to breakage of the pump mount.

With the help of an insulating tape, the power cable, suspension and pipe are fastened. The step between the joints should be within 200-1300 mm, and the first of them is located at a distance of 200-300 mm from the branch pipe.

In order to prevent a decrease in the strength characteristics of pipes and reduce the effect of corrosion processes in wiring diagram no pump connection threaded connections. The connection of parts is carried out using flanges.

The upper part of the pipeline is fixed on the base plate, on which the check valve, gate valve, elbow, and pressure gauge are also mounted. In the same place, the equipment is connected to the system that feeds the house with water.

The last step before diving into the well of the pump is to fix the suspension to the crossbar.

The process of lowering the unit must be carried out carefully so that it does not touch the walls. It is recommended to put a protective rubber ring on the housing.

In order to be able to control the water level in the well, a column is installed, consisting of gas pipes. This design should be immersed to a depth that is below the dynamic level.
In order to ensure electrical safety, it is necessary to check the insulation of the motor winding with the cable lowered. For this, a megger is used. If a satisfactory result is obtained, it is allowed to connect the control station to the pump and continue testing under load.

Pump lowering depth

Before lowering the submersible pump into the well, the water level is determined: static and dynamic.

To create normal conditions for cooling the electric motor, immersion pumping equipment carried out at the level minimum value which corresponds to 300 mm relative to the dynamic water level. Practice shows that it is better when the pump is submerged 2-3 m below it. In addition, it is important that there is a margin of 1-2 m to the bottom of the well.

Emergency pump replacement

As a rule, replacement of the submersible pump is required in case of violations during installation work during its installation. The reason for this may be an incorrectly made selection of automatic power supply or an error when choosing a pump.

If the equipment is designed for a shallower depth than it is used, then its failure will inevitably occur in shortest time. This is because the automatic shutdown settings do not correspond to real conditions, and the device has to work non-stop.