Wilo circulating pumps. Wilo circulating pumps for heating systems - a guarantee of efficient operation Placement and installation rules

A circulation pump is an integral part of any forced circulation heating system. It is on this small device that the stability of the circulation of the coolant through the pipeline depends.

Pumps from the manufacturer WILO can rightfully be considered one of the best.

Why do you need a circulation pump at all

In some cases, you can completely do without this element when it comes to systems with natural circulation. In this case, the coolant moves through the pipes due to the pressure difference that occurs when the water in the boiler is heated. The coolant expands when heated, part of it is simply squeezed up along the supply pipe, rising to the highest point, the water enters the radiators and, gradually cooling down, moves back to the boiler ().

The only advantage of such an organization of heating housing is absolute independence from electricity. This is important, for example, when heating a country house or summer cottage in a hard-to-reach area. In addition, the absence of moving elements in the system prolongs its service life.

But it is still better to install a circulation pump for heating Vilo before entering the boiler.

As for the advantages, the installation of such a device makes it possible to:

• ensure stable circulation of the coolant through the pipes. Modern models are able to reduce the speed themselves, making the heating of the house not so strong. This quality is especially useful in terms of financial savings;
• the head will not depend on the diameter of the pipe (it is better not to use small diameters in systems with natural circulation);
• installation of the pump does not reduce the durability of the system as a whole; modern models can work for 20-30 years.

Of the shortcomings, it can be noted that the small costs for electricity and noise. But the boiler is usually housed in a separate room, and the price of electricity is not so high as to refuse the pump.

Classification of circulation pumps

As for the principle of operation, all devices of this kind can be divided into 2 types:

• with a "wet" rotor;
• with "dry" rotor.

For heating a relatively small house, options with a "wet" rotor are preferable. They got this name due to the fact that the rotor (the part that rotates) is placed directly in the pumped coolant.

Circulation pumps for heating Wilo of this type have the following features:

• almost completely silent;

Note! In small houses, sometimes it is not possible to move the boiler away from the living quarters, so noiselessness is an important advantage.

• no lubrication is needed - the rotor is in the water, so the coolant itself plays its role;
• for greater reliability, the rotor chamber and the stator are separated by a strong stainless steel sleeve;
• the only and rather significant drawback is low efficiency - about 50%.

Note! A "wet" pump must be installed so that its shaft is always horizontal.

For the operation of a powerful system, it is better to use a "dry" Wilo circulation pump for heating. Unlike the "wet" analogue, its rotor does not contact the coolant at all, and it is possible to achieve a high degree of tightness due to the pumped liquid itself.

During operation, a thin film of liquid permanently seals the microscopic gaps between the rotating surfaces. Over time, the O-rings grind off a little, but the problem is solved by the fact that they are spring-loaded and simply displaced by the amount of wear, the main thing is that the grinding occurs evenly.

The main advantage of "dry" devices is the efficiency of over 80%. And a high noise level can be written down as disadvantages, which is why such pumps are used primarily in powerful systems.

More about modern circulation pumps

One of the main requirements for a modern heating system is flexibility - that is, the ability to adjust its power over a wide range. Circulation pumps for heating systems from Wilo are perfect for this.

In the distant past, circulation pumps were unregulated, that is, they did not know how to reset the rotor speed. This led to the fact that the heating system worked with approximately the same power at any time, even when there was no particular need for it.

Features of variable pumps

In our time, special attention is paid to energy saving issues, so that unregulated devices are practically not installed in new heating systems.

The use of regulated devices allows:

• change the rotor speed at any time, for example, to save energy at night, the device automatically decelerates;
• set any operating mode manually, this is useful if the owner plans to leave home for a couple of days. In this case, the heating can be left at a minimum level.

Note! The German manufacturer Wilo produces models for very harsh conditions. If the lime content is high in the water, then you should pay attention to the Wilo Star models.

As a rule, a circulation pump for Wilo heating can operate in several modes:

• PP1 and PP2 - in this case, the head in the system will change, and the designations correspond to the operating characteristic with the maximum head (PP1) and minimum (PP2);
• CP1 and CP2 - in this case, the head remains unchanged, and the pump adjusts to the coolant flow rate by changing the rotor speed;
• operating modes numbered I, II and III... The unit corresponds to the speed at the minimum operating characteristic, II and III - the speed at the average and maximum speed;
• it is possible to switch between day / night modes.

Placement and installation rules

If it is not possible to invite specialists, then the installation can be done by hand.

You just need to remember a few simple installation rules:

• it is forbidden to place the pump at the outlet of the boiler - the hot coolant will shorten the service life of the device at times. It is considered optimal to be placed on the pipe section before entering the boiler;
• the arrow on the body shows the direction of movement of the coolant, it should be directed towards the boiler;

• when the pump is already installed and filled with water, air is removed from it;
• the pump is installed so that it can be quickly isolated from the water supply if necessary. For this, a bypass is arranged and a shut-off valve is installed.

The installation instructions for the pump are not particularly complicated, and threaded connections are used, so that if necessary, it can be quickly removed for repair or replaced. Before installation, the boiler must be cut off with shut-off valves. Also, during installation, a check valve is installed (except for open systems) and a filter.

Heating systems in which the coolant circulates in a natural way according to the law of gravity are less and less common, and only where a small area is heated by a single-circuit boiler.

Forced circulation equipment

Wilo circulation pumps will help to ensure high-quality movement of hot water through pipes and batteries. They do their job well in large houses with complex heating systems. To make the right choice of a modern and compact device that will show effective operation, a review of Vilo models and instructions from the manufacturer will help.

All German-made units are distinguished by their reliability, ease of installation and the ability to reduce the diameter of the pipes, which makes it possible to reduce the cost of heating installation.

For the full heating of private houses, two series of Wilo pumps have been specially developed, which differ slightly in technical characteristics.

This range of pumps has a low power and is suitable for use in houses with an area of \u200b\u200b200 - 750 m².

Features:

The main advantage of this series is the wet rotor. It is continuously immersed in the pumped energy carrier, which prevents the graphite bearings from drying out. Another plus of Star-RS is that technical polymer is used here for the production of the rotor wheel.

This material is resistant to high temperatures typical for heating systems, and is not afraid of their sharp drop.

Housing and fasteners

The Vilo circulation pump is connected to the pipeline using a thread, the diameter of which may differ depending on the model. The unit has a cast iron body and a stainless steel shaft.

A comfortable working environment for such a device is water or a water-glycol composition. Star-RS pumps for forced heating systems are practically silent. They quickly pump the coolant and consume little electricity.

Benefits

German equipment of this series has gained great popularity due to the following advantages:

• the body is covered with an anti-corrosion cataphoresis compound;
• turns are regulated by means of a three-stage mechanical switch;
• durable metal-graphite bearings do not wear out under aggressive temperatures;
• low cost.

Working and installation conditions

Devices for heating systems of the Star-RS series can operate in a temperature mode of +10 +110 ° C at a pressure of up to 10 bar, and this makes it possible to use them in air conditioning.

When installing Vilo Star-RS, the manufacturer's instructions must be strictly followed, which states that:

• tie-in is possible after installation and flushing of pipes from chips;
• the terminal box and the motor must be reliably protected from moisture ingress;
• the pump shaft must be perfectly horizontal.

TOP-S series

Models in this series are designed for use in buildings up to 1400 m². These pumps, with one or three-phase connection, guarantee faster pumping of hot water through pipes and radiators.

In their manufacture, materials similar to the previous line from the German company Wilo were used.

Working and installation conditions

The equipment operates at a temperature of +20 + 130 ° C, and for two hours the units can operate without interruption if the maximum temperature rises by 10 ° C. The admissible pressure is 6, 10 or 16 bar (special version). As in the previous case, the speed is regulated by a three-stage switch.

Vilo TOP-S series is produced with increased motor protection and thermal insulating cover. The versatility of Wilo equipment is due to the double-sided cable connection and the configuration with a combined flange of 6/10 bar (for models with an inner diameter of 40 - 65 mm).

Product advantages

Circulation pumps from the German company Wilo successfully compete with similar devices due to the fact that they are made of anti-corrosion materials and can work with various heat carriers.

They are durable and easy to operate, besides they consume electricity economically. Another important factor that affects demand is the compact dimensions of the units with their multi-stage protection.

Signs of the original

Given the popularity of Vilo products for heating systems, there is a risk of acquiring a fake. To avoid any trouble with your purchase, pay attention to the following signs of the original:

• minimum price - 80 USD;
• the presence of a serial number on the case;
• manufacturer's instructions;
• two out of four mounting bolts (for a fake - 4).

Model overview

In order to have an idea of \u200b\u200bthe technical parameters of Vilo products, we suggest that you familiarize yourself with the main parameters of the devices. The table shows the average price of a product that is presented on the Russian sanitary ware market.

Installation and operating instructions

Circulation pumps WILO

Series: RP, P,

DOP, DOS.

Circulating pumps are designed for pumping liquid in a closed pipe system.

Main areas of application:

Water heating systems;

Cooling and air conditioning systems;

Industrial systems.

1.2 Technical parameters of pumps
1.2.1 Build series

Several types of circulating pumps are produced to meet the technical requirements of various systems. They are combined into the following design series:

- Series RP, P, Max. speed 1400 rpm., 4 speed stages,

- RP -

- P -

- Series RS, S,max. speed 2700 rpm., 4 stages

speed,

- RS -pump with threaded pipe connection,

- S -flanged pump.

- Constructive series DOP, DOS, twin pumps, 4 speed stages,

- DOP -max. speed 1400 rpm, with flange connection,

- DOS -max. speed 2700 rpm, with flange connection.
1.2.2 Key to symbols

The pumped-over medium:

· Heating system water in accordance with VDI 2035;

· Mixture of water and glycol in a ratio of max. 1: 1. The addition of glycol increases the viscosity of the fluid, therefore the hydraulic and power data of the pump should be adjusted based on the percentage of glycol. Use only high quality antifreeze with corrosion protection property, follow the manufacturer's instructions;

· The use of other fluids must be coordinated with WILO;

The admissible temperature of the pumped medium is -10 ° C to + 130 ° C, for a short time up to 140 ° C. The pumps are protected against the penetration of condensation moisture;

Maximum allowable ambient temperature + 40 ° C;

Maximum permissible operating pressure according to the type table;

The minimum pressure at the pump suction connection depends on the pump type and on the water temperature:

DN \u003d Nominal connection diameter
- Supply voltage according to the type table.

Maximum power consumption according to the typical table.

Nominal connection diameter according to type key

Day 25: R 1 (Æi 28)

Day 30: R 1 1/4 (Æi 35)

DN\u003e 32: flange connection (DN ...) with a hole for connecting a pressure measuring device with a diameter of Rp 1/8.
2 Safety precautions
This manual contains all important information that must be observed during installation and operation. Therefore, installers and operators should carefully read these instructions. Observe not only the instructions given here, but also the special safety instructions given in the following instruction articles.

2.1 Special characters

All safety instructions which, if not followed, could result in damage to the pump and pose a risk to human life, are marked with the symbol:

Electrical voltage warning:

Instructions which, if not followed, may result in malfunction of the system or individual parts, are marked with the symbol:

ATTENTION!

2.2 Personnel qualifications

Installation should only be carried out by qualified personnel.
2.3 Consequences of non-observance of the safety instructions

Failure to follow the instructions can lead to serious consequences for personnel and damage to the unit. In addition, it may lead to the deprivation of the right to compensation.

In particular, non-observance of the instructions can lead to the following consequences:

Failure of important plant functions;

Danger to human health and life due to electrical or mechanical influences.
2.4 Safety instructions for operation

Observe the safety instructions!

In particular, follow all local regulations and safety regulations.
2.5 Safety instructions for inspection and installation work

It must be ensured that all inspection and installation work is carried out only by qualified personnel and after careful study of this manual.

The pump check can only be carried out in a completely stopped state.
2.6 Unauthorized adjustments and production of spare parts

Any changes to the installation are only permitted with the prior consent of the manufacturer. Genuine spare parts and accessories from the manufacturer guarantee your safety. The use of other spare parts relieves the manufacturer of responsibility for the possible consequences.
2.7 Inadmissible modes of operation

The operational safety of the supplied unit is guaranteed only if it is used only for the conditions and purposes specified in this manual.

In no case should the data specified in the attached passport be exceeded.
3 Transport and storage

ATTENTION!
Protect pumps from moisture and mechanical damage during transportation and storage.
4 Description of pumps and accessories

4.1 Description of wet running pumps

In wet running pumps, all moving parts, including the motor rotor, are washed with liquid. No shaft seal required. The fluid lubricates the sleeve bearings, cools them and the rotor.

Twin pumps are identical and are installed in the same housing. They are equipped with an integrated changeover valve. Each pump can work autonomously, as well as both at the same time. Twin pumps can be used in two different versions:

Working and standby pump (in case of failure of the main pump, the standby pump is put into operation);

Main and peak pump (the latter is switched on additionally at peak loads).

At the same time, both pumps can differ in terms of installed capacities. A twin pump installation can therefore be adjusted to an individual operating situation.

Pump motor:

For single-phase 220 V: special motor for single-phase operation only;

For three-phase 380 V: special motor for three-phase only. The motor cannot be connected according to the Steinmetz scheme.

Engine protection:

Pumps with an inner diameter of 25/30/40 and an impeller up to 80 mm (single-phase and three-phase current) do not need motor protection. Overload current cannot damage the motor and cause it to block.

All other pump motors are equipped with a winding contact protection (WSK). In the event of impermissible overheating of the motor, protection by means of a switch, eg SK 602/622 or C-SK (accessories), switches off the motor. After the engine has cooled down, the pump can be switched on again. A circuit breaker (SK 602, SK 622 or C-SK) is highly recommended for motor protection. When using WILO switching devices for automatic control, there is no need for special switches, since they are already integrated in the switching devices.

An automatic switching device S2R3D is required to control the double pump. The motor protection switch is also integrated in the switching device.
Speed \u200b\u200bchangeover:

All pumps have a 4-stage manual switch (on the terminal box). At the lowest stage, the speed is reduced by 40-70% of the maximum. Electricity consumption will decrease by 50%.

Pumps with single-phase motors as a switch have a rotary knob on the terminal box housing (Fig. 1a, item 1).

Pumps with single-phase motors with power P 2 less than 75 W also have the option of connecting a two-stage automatic switch (S2R-h, timer).

On pumps with a 3-phase current motor, the speed changeover is carried out by switching the 4-stage plug on the terminal box. In addition, it is possible to connect a 2/4-step automatic switch (fig. 1b, item 1).
Automatic control and regulation devices:

Devices for automatic control and regulation of pump power depending on hydraulic needs are available in the WILO program.
4.2 Scope of delivery

Complete pump;

Installation and operating instructions.
4.3 Accessories (optional)

Connecting nuts for pumps with threaded connection;

Full motor protection disconnecting devices SK 602, SK 622, C-SK (the latter is only for 380 V);

Timer SK601, (direct connection only to single-phase pumps with power P2 less than 75 W, for all other pumps only in combination with SK 602 or SK 622);

S2R-h plug module;

Switches S2R2.5, S4R2.5, S2R3D, S4R2.5D;

Stepless control device AS 0.8mP.
5 Assembly and installation

5.1 Installation

Install after the completion of all welding and plumbing works and flushing the pipe system. Contamination can impair the operation of the pumps.

- The pumps must be installed in easily accessible places so that later it can be easily checked or replaced.

It is recommended to install shut-off valves before and after the pump. This eliminates the need to refill the system when replacing the pump. The fittings must be installed in such a way that, in the event of leaks, water does not enter the motor and the terminal box.

Always install the pump in a system with an open expansion vessel downstream of the connection point.

Installation should be done without mechanical stress and only with a horizontal pump shaft; Observe the installation position as shown in Figure 2.

An arrow on the pump housing indicates the direction of flow.

The motor terminal box must not point downwards as water can easily enter it. Rotate the motor housing if necessary.

ATTENTION!
Do not damage gaskets.

ATTENTION!
When insulating the pipes, only the pump casing is insulated. The engine must remain open.

For pumps equipped with a plug-in module, the access of air to the module must be free.

5.2 Electrical connection

WILO pumps can be connected to 220/380 V mains and European 230/400 V.

The electrical connection must be carried out strictly according to the manual with a plug connection or an omnipolar switch with a specified minimum contact distance \u003d 3mm.

To ensure protection against water ingress and to reduce the stress on the packing nut, a cable of sufficient diameter must be used.

When installing pumps in systems with a water temperature of more than 90 ° C, a temperature-resistant cable must be used, which must under no circumstances come into contact with the piping or the pump casing.

Recheck the type of current and voltage in the network and compare with the data in the table on the pump.

- Observe the pump data sheet.

- The mains connection and connection of the SK 602/622 circuit breaker according to the diagrams (Fig. 3a to 3e) are performed (see also 1.22 and 4.1):

3a: 220V, non-blocking motor.

3b: 380V, non-blocking motor.

3c: 220 V, with WSK (motor winding thermal protection contacts).

3d: 380V, with WSK.

3e: When installing a C-SK switch-off plug module, 3d is replaced by 3e.

Carry out grounding.

When using other protective devices, terminals 15 and 10 (WSK) must be connected to the motor control circuit (max. 250 V) in conjunction with the anti-restart device. The pump is then protected in all four stages.

ATTENTION!

- The thermal cut-out must be set according to the corresponding maximum current for the selected speed stage (see type table).

Observe the corresponding installation and operating instructions when connecting the circuit breakers.
6 Commissioning

6.1 System filling and bleeding

Fill the system properly. Air removal from the system occurs independently after a short-term activation of the pump. Short dry running will not damage the pump. If direct bleeding of the pump is required, this can be done as follows:

Switch off the pump;

Close the outlet shut-off valves;

Carefully unscrew the venting screw (fig. 4).

- Carefully push the pump shaft back;

Protect electrical parts from liquid and vapor;

Switch on the pump;

After 15 ... 30 seconds of operation, turn off the pump and tighten the air release screw;

Open the valve again and switch on the pump.

ATTENTION!
If the screw hole is open, depending on the pressure, the pump may block.

6.2 Adjustment

- Checking the direction of rotation of three-phase motors:

Loosen the screw on the front of the engine before checking the direction of rotation. By switching on for a short time, check whether the direction of rotation of the shaft matches the arrow on the plate. If the direction of rotation is wrong, change 2 phases.

- Switching the number of revolutions:

Single-phase motors: changeover between 4 speed stages is done manually by a switch on the motor terminal box. Three-phase motors: changeover between 4 speed stages is done manually by switching over the 4-stage plug on the motor terminal box. Loosen the central bolt and set the 4-stage connector with an arrow to the required speed stage. Tighten the central screw again.

7 Service

The pumps are maintenance-free.
8 Malfunctions, causes and elimination

8.1 The pump does not run when the power is on

Check fuse.

Check the voltage at the pump (observe type data).

Check condenser size (observe type data).

The engine is blocked, for example due to solids deposits in the system water.

Remedy: Unscrew the central plug and check the pump rotor stroke, release the pump with a screwdriver.

- If the pump stops due to a tripped motor protection, check the protection switch.
8.2 The pump is noisy

In case of cavitation due to insufficient pressure at the pump suction. Remedy: increase the pressure in the system within the permissible range.

Check the number of set revolutions, if necessary, set to a lower stage.
If you cannot rectify faults yourself, please contact your nearest WILO customer service.
9 Spare parts

Spare parts supplied:

Pump casing, complete.

Standby engine complete.

Terminal box, complete.

Body seal.

Changeover valve, complete (DOP / DOS only).

When ordering spare parts, state all pump type data.

Drawings:

1.Switch of the number of revolutions.

2.Installation position of the pump.

3. Connection diagrams for individual pumps.

4. Opening the venting screw.

The manufacturer reserves the right to make technical changes.

Heating systems that use the natural circulation of the coolant are slowly becoming a thing of the past. Affected by their low performance, narrow focus and lack of high pressure in the system, which is important for houses with a large area.

Gradually, natural circulation in heating systems is replaced by forced circulation, where one of the main units is a circulation pump.

Circulation pumps from WILO: design features and main characteristics

Currently, the domestic market is extremely rich in all kinds of circulation pumps for installation in the heating system.

It should be noted that among them there are both really high-quality, well-designed models, and outright Chinese fakes that are not able to work for more than one season.

Naturally, if the heating system is chosen, as they say, "for centuries", then all the units installed in it must be of high quality, reliable and efficient.

Circulation pumps for heating systems Wilo, which are produced by a renowned German concern, are in great demand among domestic consumers.

As you know, the Vilo heating circulation pump is the "heart" of the modern heating system and the manufacturing company understands this.

With more than 100 years of experience, unique equipment and careful selection of materials, Wilo pumps are distinguished by their performance, power and reliability. Models are presented for both civil and industrial buildings.

Tip: Vilo pumps are presented in a large assortment, and therefore, before buying a particular model, it will not be superfluous to consult with specialists. Only professionals will give specific advice and help you choose the best unit for each specific case.

Vilo circulation pumps - performance and quality

In modern heating systems, Wilo circulation pumps for heating perform an extremely important task - they ensure the rapid movement of the coolant in the network. As a result (and the instruction for the Vilo pumps speaks about this), the heat transfer improves almost several times, the efficiency of the system increases.

Also, if there is a Wilo circulation pump for heating in the circuit, you can significantly save on pipes, because the lines (due to forced pressure generation) have a significantly smaller diameter than if natural circulation was used.

As for the equipment itself, Vilo pumps are practically silent, reliable and practical, have compact dimensions and do not require any special maintenance.

Any circulation pump from Wilo SE is a modern and efficient unit, it works for a long time and trouble-free. It should be noted that installing it with your own hands does not turn into some kind of complex and time-consuming operation. And the price for such equipment is much lower than for analogs on the domestic market.

Wide range of Wilo pumps - the ability to make your heating system efficient

The domestic market offers a huge selection of modern, reliable and high-quality pumps from this German company. In many photos and videos posted on the Internet, you can easily see the main assortment of equipment that the Wilo group really produces in abundance.

Among the most popular models of Vilo circulation pumps are:

• WiloStar-RS and model WiloStar-RSD- low-power, but at the same time reliable pumps that are quite inexpensive. Ideal for various home heating systems. A built-in manual speed switch is available to increase the efficiency of the equipment. Pumps from this series are suitable for heating rooms with an area of \u200b\u200b200-750 m2;

Circulation pump

• Wilo Stratos ECO effectively replaced the previous generation of circulation pumps, ideal for integration into large heating systems in which the power of the boiler plant exceeds 25 kW. These are electronic pumps, the regulation of power and performance in which is carried out by means of a special system. Circulation pumps of this class are suitable for small cottages (more than 80% of existing heating systems). A feature can be called low electricity consumption and the ability to work with a coolant even at negative temperatures;

• TOP-RL and model TOP-S from the manufacturer Vilo - circulating pumps designed specifically for buildings with an area exceeding 1400 sq. meters. These are three-phase and double pumps, the operation of which is possible in modes of increased efficiency and productivity;

• Wilo TOP-Z - pumps designed for systems where magnesium and calcium salts are deposited. Such equipment perfectly copes with any tasks, provide normal heating operation even with low water quality.

Circulation pump Wilo TOP-Z

Advantages of using Vilo pumps in heating systems

Modern circulation pumps for heating systems Wilo are an excellent choice for any property, be it a small country cottage or an industrial enterprise.

The use of Vilo pumps for systems with forced circulation of the coolant allows you to get a lot of advantages:

1. Increasing the efficiency of the coolant flow through pipelines, better heat transfer even in the farthest corners of the heating system;
2. Reducing fuel consumption by boilers and, as a result, significant financial savings. Especially relevant for large boiler houses at industrial enterprises and other facilities;
3. Extension of the period of trouble-free operation of the heating system.Circulation pumps are able to create a fairly high pressure in the pipeline, which excludes the deposition of salts from the coolant ... In turn, blockages and narrowing of pipe diameters are excluded.

Conclusion

As you can see from the above material, such pumps for heating systems (although their installation is also possible in hot water pipelines) can increase the efficiency and productivity of work, reduce costs, and also eliminate breakdowns.

Pumps from the eminent German brand are surprisingly well integrated into existing and functioning heating systems (due to their low weight and dimensions). They provide a fast flow of coolant and its circulation through all radiators.

Nevertheless, their choice must be approached with all responsibility, taking into account the area of \u200b\u200bthe heated rooms, as well as the friction losses in the pipes.

The choice of WILO circulation pumps is a great opportunity to become the owner of an efficient heating system. Such equipment fully meets all quality standards, is made only from the best materials and using innovative technologies.

- see here.

In Russia, the official representative of the international company Wilo is Vilo Rus LLC. She has many partners in many cities of the country. Each partner is issued a certificate that confirms his right to sell products of this brand. We do not recommend buying anything from non-certified dealers, as you can run into a fake.

Wilo glandless heating pumps

The technical characteristics presented in the Vilo glandless pump catalog allow them to operate in autonomous heating with pressures up to 10 bar. The coolant is pumped through thanks to the impeller fixed on the shaft (rotor). The peculiarity of this line is that the rotor must always be immersed in water (heat carrier), which performs two important functions: lubrication and cooling. This condition imposes certain requirements for the installation - the rotor must be in a horizontal plane. Following this simple rule, you do not have to think about repairing Vilo pumps (see).

The range is divided into two categories: with automatic power control and with manual power control. A total of 21 models of wet rotor pumps are presented. Their body is made of gray cast iron or bronze, the rotor is steel, the impeller is made of plastic, the bearings are metal-graphite. The unit can be installed on the circuit by means of a threaded or flange connection. The latter option is typical for industrial Wilo pumps.

It is still the most demanded and economical one.

Calculate the required heat output beforehand.

In autonomous heating, it is necessary through a mixing unit that regulates the temperature of the coolant.

A coarse filter (sump) must be installed in front of the pump. It is needed so that solid particles do not fall on the impeller blades and break it. The coolant always contains deposited salts or metals (scale), and the quality of water in central networks is generally terrible.

The pump is attached to the circuit by the Americans - a detachable connection, which in turn are installed on ball valves. This will allow you to isolate the pump from the circuit at any time and remove it for repair or maintenance without draining water from the entire system. . without the provided make-up from the water supply system - for a long time.