The circulation pump is an integral element of any forced circulation heating system. It is from this small device that the stability of the circulation of the coolant through the pipeline depends.
Pumps from the manufacturer WILO can rightly 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 is heated in the boiler. The coolant expands when heated, part of it is simply squeezed out up the supply pipe, rising to the very high point water enters the radiators and, gradually cooling down, moves back to the boiler ().
The only advantage of such an organization for heating housing can be called absolute independence from electricity. This is important, for example, when heating country house or cottages in a remote area. In addition, the absence of moving parts 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:
- ensure stable circulation of the coolant through the pipes. Modern models are able to reduce the number of revolutions themselves, making the heating of the house not so strong. This quality is especially useful in terms of financial savings;
- the pressure 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 last 20-30 years.
Of the shortcomings, one can only note the small cost of electricity and noise. But the boiler is usually located 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 a "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 Wilo heating of this type have the following features:
- almost completely silent;
Note! AT not big houses sometimes it is not possible to move the boiler away from living quarters, so noiselessness is an important advantage.
- lubrication is not needed - the rotor is in the water, so the coolant itself performs its role;
- for greater reliability, the rotor chamber and the stator are separated by a durable stainless steel sleeve;
- single and pretty significant disadvantage can be considered low efficiency - about 50%.
Note! A "wet" pump must be installed so that its shaft is necessarily horizontal.
To operate 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 finally seals the microscopic gaps between the rotating surfaces. Over time, the o-rings grind a little, but the fact that they are spring-loaded and simply shift by the amount of wear solves the problem, the main thing is that the grinding occurs evenly.
The main advantage of "dry" devices can be called an efficiency of more than 80%. And in the shortcomings can be written down high level noise, therefore such pumps are used mainly in powerful systems.
More about modern circulation pumps
One of the main requirements for a modern heating system can be considered flexibility - that is, the ability to adjust its power in wide range. Circulation pumps for Wilo heating systems are the best fit for this.
In the distant past, circulation pumps were unregulated, that is, they could not reset the rotor speed. This led to the fact that the heating system worked at approximately the same power at any time, even when there was no particular need for it.
Features of the operation of variable pumps
Nowadays, energy conservation issues are Special attention, so that unregulated devices are practically not installed in new heating systems.
Usage regulated devices allows:
- change the rotor speed at any time, for example, to save energy at night, the device itself slows down;
- 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 work in very harsh conditions. If the lime content in the water is high, then you should pay attention to the Wilo Star models.
As a rule, the Wilo heating circulation pump can operate in several modes:
- PP1 and PP2- in this case, the pressure in the system will change, and the designations correspond to the operating characteristic with maximum pressure (PP1) and minimum (PP2);
- SR1 and SR2- in this case, the pressure remains unchanged, and the pump adjusts to the flow rate of the coolant by changing the number of revolutions of the rotor;
- 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.
Just need to remember a few simple rules for installation:
- it is forbidden to place the pump at the outlet of the boiler - the hot coolant will shorten the life of the device at times. It is considered optimal to place it on the pipe section in front of the boiler entrance;
- the arrow on the body shows the direction of movement of the coolant, it must 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 water ingress if necessary. To do 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 replacement. Before installation, the boiler must be cut off with shut-off valves. Also installed during installation check valve(with the exception of open systems) and a filter.
In Russia official representative The international company Wilo is Wilo 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.
Heating pumps Glandless forks
The technical characteristics presented in the catalog of Glandless Fork pumps allow them to work in autonomous heating pressure up to 10 bar. The coolant is pumped through the impeller mounted on the shaft (rotor). The peculiarity of this line is that the rotor must always be immersed in water (coolant), which performs two important functions: lubrication and cooling. This condition imposes certain installation requirements - the rotor must be in horizontal plane. By following this simple rule, you will 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 pumps with a wet rotor are presented. Their body is made of gray cast iron or bronze, the rotor is steel, the impeller is made of plastic, and the bearings are metal-graphite. The unit can be installed on the circuit by means of a threaded or flanged connection. The last option is typical for Wilo industrial pumps.
Until now, it is the most popular and economical.
Before that, calculate the required heat output.
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 get 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 Americans - detachable connection, which in turn are set to Ball Valves. This will allow you to cut off the pump from the circuit at any time and remove it for repair or maintenance without draining the water from the entire system. . without the provided make-up from the water supply - for a long time.
Installation and operating instructions
WILO circulation pumps
Model range: RP, P,
DOP, DOS.
Circulation pumps are designed for pumping liquid in a closed pipe system.
Main applications:
Water heating systems;
Cooling and air conditioning systems;
Industrial systems.
1.2 Technical parameters of the pumps
1.2.1 Construction series
To satisfy technical requirements various systems, several types of circulation pumps are produced. They are combined in the following constructive rows:
- Series RP, P, Max. speed 1400 rpm, 4 speed levels,
-RP-
-P-
- Series RS, S, Max. speed 2700 rpm, 4 steps
number of revolutions
-RS- pump with threaded pipe connection,
-S- flanged pump.
- Structural range 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 notation
| DO S 32 / 80 r | |||||||
| Double pump | |||||||
| R®with threaded connection, without R® with flange conn. | |||||||
| S®max. speed 2700 rpm. (P®1400 rpm) | |||||||
| Rated Int. pipe connection diameter | |||||||
| Impeller diameter in mm | |||||||
| The presence of 4 stages of switching the number of revolutions | |||||||
1.2.3 Technical parameters
Pumped medium:
· heating water according to VDI 2035;
Mixture of water with glycol in a ratio of max. 1:1. When glycol is added, the viscosity of the liquid increases, so the hydraulic and power data of the pump must be adjusted depending on the percentage of glycol. Use only high-quality antifreeze with corrosion protection properties, follow the manufacturer's instructions;
· the use of other fluids must be agreed with WILO;
Permissible fluid temperature from -10°C to +130°C, short-term up to 140°C. The pumps are protected from the penetration of condensation moisture;
Maximum allowable temperature environment+40°C;
Maximum allowable operating pressure according to the type table;
The minimum pressure at the suction port of the pump depends on the pump type and the water temperature:
| Pump types | Minimum pressure R min [kg / cm 2] |
|||
| at temperature [°C] |
||||
| 50 | 95 | 110 | 130 |
|
| all RP, P, DOP, DOS up to P 1 max=250 W | 0,05 | 0,2 | 0,8 | 2,1 |
| P and DOP with Æ=125, DOP with DN=50 and Æ=100 | 0,05 | 0,3 | 0,9 | 2,2 |
| P c Æ=160, RS with DN=30 and Æ=100, S c Æ=80 ...100 | 0,05 | 0,5 | 1,1 | 2,4 |
| P c Æ=200/250, S c Æ=125, DOS c Æ=125 | 0,3 | 1,0 | 1,6 | 2,9 |
| S and DOS c Æ=140 | 0,5 | 1,2 | 1,8 | 3,1 |
Æ = Nominal impeller diameter
DN= Nominal diameter of the connection
- Electrical connection voltage according to type table.
Maximum power consumption according to type table.
Nominal inner connection diameter according to type key
Day 25: R 1 (Æi 28)
Day 30: R 1 1 / 4 (Æi 35)
DN > 32: Flange connection (DN...) with hole for connecting a pressure measuring instrument Rp 1/8.
2 Safety
This manual contains all important instructions that must be observed during installation and operation. Therefore, installers and operators should read this manual carefully. Observe not only the instructions given here, but also the special safety instructions that are given in the following instructions.
2.1 Special characters
All safety instructions, the non-observance of which can lead to damage to the pump and endanger human life, are marked with the symbol:
Electrical Voltage Warning:
Instructions, the non-observance of which can lead to a malfunction of the system or individual parts, are marked with the symbol:
| ATTENTION! |
ATTENTION!
2.2 Personnel qualifications
Installation must only be carried out by qualified personnel.
2.3 Consequences of non-observance of the safety instructions
Non-observance of the instructions can lead to serious consequences for personnel and damage to the installation. In addition, this may lead to the deprivation of the right to compensation for damages.
In particular, non-observance of the instructions can lead to the following consequences:
Failure of important installation functions;
The occurrence of a danger to the health and life of people due to electrical or mechanical influences.
2.4 Safety instructions for use
Observe the safety regulations!
In particular, observe all domestic instructions and safety rules.
2.5 Safety instructions for inspection and installation work
Care must be taken to ensure that all inspection and installation work carried out only by qualified personnel and after careful study of this manual.
The pump test can only be carried out in a complete stop state.
2.6 Unauthorized modifications and manufacture 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 - a guarantee of your safety. The use of other spare parts removes the responsibility from the manufacturer for possible consequences.
2.7 Unacceptable methods of operation
The safe operation of the supplied unit is only guaranteed if it is used only under the conditions and for the purposes specified in this manual.
In no case should the data specified in the attached passport be exceeded.
3 Transport and storage
ATTENTION!
During transport and storage, protect the pumps from moisture and mechanical damage.
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 flushed with liquid. Shaft seals are not required. The liquid lubricates the plain bearings, cools them and the rotor.
The twin pumps are identical and installed in the same housing. They are equipped with an integrated changeover valve. Each pump can work autonomously, as well as both - simultaneously. 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 activated additionally at peak loads).
In this case, both pumps can differ in installed capacities. The twin pump plant can therefore be adjusted to the individual production situation.
Pump motor:
For single-phase current 220 V: special motor only for operation with single-phase current;
For 3-phase current 380 V: special motor for three-phase current only. The motor cannot be connected according to the Steinmetz scheme.
Engine protection:
Pumps with an internal 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 stall.
The motors of all other pumps are equipped with contact winding protection (WSK). In case of impermissible overheating of the motor, protection via a switch, eg SK 602/622 or C-SK (accessories), switches off the motor. After the motor 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.
To control the twin pump, an automatically operating switching device S2R3D is required. The motor protection switch is also integrated in the switching device.
Speed changeover:
All pumps have a 4-stage manual switch (on the terminal box) . At the lowest stage, the number of revolutions is reduced by 40-70% of the maximum. Energy consumption will be reduced by 50%.
Pumps with single-phase current motors have a rotary knob on the terminal box body as a switch (Fig. 1a, pos. 1).
Pumps with single-phase current motors with a power of P 2 less than 75 W can also be connected to a two-stage automatic switch (S2R-h, timer).
On pumps with a three-phase current motor, the speed is switched over by switching the 4-stage plug on the terminal box. In addition, it is possible to connect a 2/4-stage automatic switch (fig. 1b, pos. 1).
Devices automatic control and adjustments:
Devices for automatic control and adjustment of pump power depending on hydraulic needs are available in the WILO program.
4.2 Scope of delivery
Complete pump;
Instructions for installation and operation.
4.3 Accessories (optional)
Connecting nuts for pumps with threaded connection;
Tripping devices for complete motor protection SK 602, SK 622, C-SK (the latter only for 380 V);
Timer SK601, (direct connection only to single-phase current pumps with a power of P 2 less than 75 W, for all other pumps only in combination with SK 602 or SK 622);
Plug module S2R-h;
Switches S2R2.5, S4R2.5, S2R3D, S4R2.5D;
Stepless control device AS 0,8mP.
5 Assembly and installation
5.1 Mounting
The installation should be carried out after the completion of all welding and locksmith work and flushing of the pipe system. Contaminants can impair pump performance.
- The pumps must be mounted in a well accessible places so that you can easily check or replace the pump in the future.
It is recommended to install stop valves before and after the pump. This eliminates the need to refill the system when replacing the pump. The fittings must be mounted in such a way that, in case of leaks, water does not get on the electric motor and the terminal box.
Installing a pump in an open system expansion tank always make after the place of its connection.
Installation should be carried out without mechanical stress and only with a horizontally located pump shaft; observe the installation position as shown in figure 2.
The arrow on the pump body shows the direction of flow.
The motor terminal box must not point downwards as water can easily get into it. Rotate the motor housing if necessary.
ATTENTION!
Do not damage gaskets.
ATTENTION!
When insulating pipelines, only the pump housing is insulated. The engine must remain open.
For pumps equipped with a plug-in module, the module must be free of air.
5.2 Electrical connection
WILO pumps can be connected to the 220/380V power supply and to the European 230/400V network.
The electrical connection must be carried out strictly according to the manual with a plug-in connection or an all-pole switch with the provided minimum distance between contacts = 3mm.
Sufficiently sized cable must be used to protect against water ingress and reduce stress on the packing nut.
When installing pumps in systems with water temperatures above 90°C, a temperature-resistant cable must be used, which must under no circumstances come into contact with the pipeline or with the pump housing.
Check the type of current and voltage in the network and compare with the data in the table on the pump.
- Observe the type data of the pumps.
- Network connection and connection of the SK 602/622 circuit breaker according to the diagrams (Fig. 3a to 3e) should be performed (see also 1.22 and 4.1):
3a: 220V non-blocking motor.
3b: 380V non-blocking motor.
3s: 220 V, with WSK (motor winding thermal protection contacts).
3d: 380 V, with WSK.
3e: when installing a C-SK switching plug, circuit 3d is replaced by 3e.
Perform grounding.
When using other protection devices, terminals 15 and 10 (WSK) must be connected to the motor control circuit (max. 250 V) together with an anti-reclosing device. Then the pump on all four stages is protected.
ATTENTION!
- The setting of the thermal switch must be carried out according to the corresponding maximum current for the selected speed stage (see type table).
When connecting circuit breakers, observe the relevant installation and operating instructions.
6 Commissioning
6.1 Filling the system and venting
Fill the system properly. The removal of air from the system occurs independently after a short-term activation of the pump. Short-term dry running does not harm the pump. If direct venting of the pump is required, this can be done as follows:
turn off the pump;
Close the shut-off valve at the outlet;
Carefully unscrew the bleed screw (Fig. 4).
- Carefully push the pump shaft back;
Protect electrical parts from liquid and vapour;
Turn on the pump;
After 15 ..... 30 seconds of operation, turn off the pump and tighten the air release screw;
Open the fitting again and turn on the pump.
ATTENTION!
When open screw hole, depending on the pressure, the pump may be blocked.
6.2 Adjustment
- Checking the direction of rotation of three-phase motors:
Before checking the direction of rotation, unscrew the screw on the front of the motor. By briefly switching on, 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 current motors: switching between the 4 speed stages is done manually using the motor terminal box switch. Three-phase current motors: switching between the 4 speed stages is done manually by switching the 4-stage plug on the motor terminal box. Loosen the central bolt and set the 4-stage plug with arrow to the desired speed level. Tighten the central screw again.
7 Service
The pumps are maintenance free.
8 Faults, causes and remedies
8.1 The pump does not work when the power is on
Check fuse.
Check voltage at pump (observe type data).
Check capacitor size (observe type data).
The engine is blocked, for example, due to deposits of solid particles contained in the system water.
Remedy: Unscrew the central locking screw and check the stroke of the pump rotor, unlock the pump with a screwdriver.
- If the pump stops due to motor protection, check the protection switch.
8.2 The pump is noisy
In case of cavitation due to insufficient suction pressure of the pump. Remedy: increase the pressure in the system within the allowable range.
Check the number of revolutions set, if necessary set to the lowest setting.
If you cannot rectify faults yourself, please contact your nearest WILO customer service.
9 Spare parts
Supplied spare parts:
Pump body, complete.
Reserve engine, complete.
Terminal box, complete.
Body seal.
Changeover valve, complete (only for DOP/DOS).
When ordering spare parts, indicate all pump type data.
Pictures:
1. Speed switch.
2.Installation position of the pump.
3. Wiring diagrams for individual pumps.
4. Opening the screw to remove air.
The right to make technical changes remains with the manufacturer.
Heating systems in which the coolant circulates naturally according to the law of gravity are becoming less and less common, and only where small area heated with a single-circuit boiler.
Forced circulation equipment
Ensure quality travel hot water Wilo circulation pumps will help you through pipes and batteries. They do an excellent job with their functions in large houses with complex branching of heating systems. Do right choice modern and compact device that will show efficient work, an overview of Vilo models and instructions from the manufacturer will help.
All German-made units are distinguished by reliability, ease of installation and the ability to reduce the diameter of the pipes, which reduces the estimate for heating installation.
For the full heating of private houses, two series of Wilo pumps were specially developed, which differ somewhat in technical characteristics.
This range of pumps has a small capacity and is suitable for use in houses whose area is in the range of 200 - 750 m².
Peculiarities
The main advantage of this series is the wet type rotor. It is continuously immersed in the pumped energy carrier, which does not allow the graphite bearings to dry out. Another plus of Star-RS is that a technical polymer is used here for the production of a rotor wheel.
This material is impact resistant high temperatures characteristic of 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 vary depending on the model. The unit has a cast iron body and 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 practically silent. They quickly pump coolant and consume little electricity.
Advantages
The German equipment of this series has gained great popularity due to the following advantages:
- the body is coated with an anti-corrosion cataphoretic composition;
- revolutions are regulated using a three-stage mechanical switch;
- hardy metal-graphite bearings do not wear out at aggressive temperatures;
- low cost.
Working conditions and installation
Devices for heating systems of the Star-RS series can work in temperature regime+10 +110 °C at pressures up to 10 bar, and this makes it possible to use them in air conditioning.
When installing the Fork 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;
- the pump axle must be located strictly horizontally.
TOP-S series
Models of this series are designed for use in buildings up to 1400 m². Such pumps with one or three-phase connection guarantee an accelerated 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 conditions and installation
The equipment operates at a temperature of +20 + 130 °C, and for two hours the units can operate without interruption with an increase in the maximum temperature by 10 °C. Permissible pressure is 6, 10 or 16 bar (special version). As in the previous case, the speed is controlled by a three-stage switch.
The Vilo TOP-S series is available with increased engine protection and a thermal insulating casing. The versatility of Wilo equipment is due to the double-sided cable connection and the complete set with a combination flange 6/10 bar (for models with an internal 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 from anti-corrosion materials and can work with various coolants.
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 trouble when buying, pay attention to the following signs original:
- the minimum price is 80 USD;
- the presence of a serial number on the case;
- manufacturer's instructions;
- two mounting bolts out of four (for a fake - 4).
Model overview
In order to have an idea about technical parameters Vilo products, we suggest that you familiarize yourself with the main parameters of the devices. The table shows average price product shown on Russian market plumbing.
For real efficient heating impossible without forced circulation. To do this, it is necessary to install pumps, the design of which is designed specifically for such operating conditions. And often it is the Wilo heating circulation pump: instructions, reviews, characteristics about which will help you choose the right optimal model.
About Wilo
Why Wilo? Firstly, this company is the founder of all modern circulation pumps. Back in 1928, she developed the first system for the forced movement of fluid in pipes. It was this company that made the serial Wilo electronically controlled water heating pump (1988). And despite the rather tough competition, Wilo is still the flagship in its industry.
A feature of the company's products is an integrated approach to solving specific problems - heating, air conditioning or cooling. Therefore, the characteristics of Wilo pumps for heating meet the most stringent requirements, namely:
- Wide Range performance characteristics– maximum pressure (up to 16 bar) and temperature (from -10°С to +110°С) of the coolant;
- The centrifugal wheel provides radial movement of water, which greatly reduces the hydraulic resistance;
- A feature of the Wilo pump for heating is the "wet" stator. Such an engineering solution excludes the use of air cooling of the engine in the design (this is done by the water itself through the stator). The bearing is lubricated in the same way;
- The choice of control system is three-stage, with an extended switching interface or with automatic power control.
But not only these indicators are decisive for the consumer. All circulation pumps for Wilo heating systems are of competitive price and quality.
The pump in the heating system is designed to increase the speed of the coolant. But you need to remember that exceeding this parameter can lead to a loss of heat transfer from radiators, since their surface simply will not have time to heat up.
Wilo products
How to choose the right pump model for autonomous system heating? First of all, you need to calculate its power. Each instruction of the Wilo heating circulation pump is characterized by such important indicators as pressure (m) and flow (m³ / h). Approximate calculation in this case incorrectly. To do this, all the features of the system should be taken into account - the height of the house, the volume of the coolant, the length of the line, the thermal mode of operation, etc. The best option calculation of the pump for water heating Wilo - online calculator or special program.
Only after this stage, you can start choosing a specific model. Reviews of Wilo circulation pumps for heating will help to form an objective opinion about the features of its operation. But keep in mind that the quality of the device depends largely on correct installation and the correspondence of its parameters to the characteristics of the system.
Some reviews of Wilo pumps say that they are inefficient during a power outage. To do this, it is necessary to provide sources of emergency power supply - batteries or diesel generator. Fortunately, the consumption of the pump of electricity is minimal.
Circulation pumps Wilo-Star-RS
The main characteristics of Wilo pumps for heating in this class are simplicity of design and affordable cost. Its design is a zigzag pipe, in the middle of which there is a circulation impeller.
Models of this class have 3 gradations of rotor speed required for uniform load distribution. Each circulation pump for Wilo heating systems has the following designation:
Wilo-Star-RS N/Q
Where N– the size of the nominal inner diameter (from 15 to 30 mm), Q– pressure value (from 2 to 8 m).
In addition to these characteristics, you need to know the connection parameters to the pipeline and to the mains. The Wilo heating pump device Star-RS has a 4-position terminal box and an external threaded connection with dimensions - ½”, 1” and 1½”. Design features are also expressed as follows:
- Possibility of installation in any position with a horizontal shaft;
- Protection class IP44;
- Electrical network - 220V.
If, after preliminary reading the instructions for the Wilo heating circulation pump, it became clear that this power would not be enough, you can purchase the twin model Wilo-Star-RSD.
Its maximum flow rate can be 7 m³ / h with a design head of 5 m. In this case, it is necessary to take into account the synchronism of the engines at the same shaft speed. Otherwise, not only the efficiency of the device will be reduced, but there will also be a possibility of its breakdown. In some negative reviews Wilo circulation pumps for heating do not mention the incorrect operation of a particular model. Therefore, their subjectivity should be taken into account.
The average cost of Star-RS depends on its parameters and can range from 2200 to 4500 rubles.
The price of a paired model ranges from 6300 to 6800 rubles.
The pump must be installed before the inlet of the return pipe in the boiler, but before the expansion tank.
Wilo-Stratos circulation pumps
To create automatic control of water heating parameters, it is recommended to purchase Wilo pumps of the Stratos series. Their mechanical part is completely identical to Star-RS. The difference lies in the electronic control unit.
To visualize the current characteristics of Wilo pumps for a specific heating mode, an LCD display is provided. It displays the speed of the impeller. The switching part of the device includes the most common modules - CAN, LON, Modbus, etc. With their help, the Wilo pump device is switched with heating elements - a boiler and a programmer.
It is noteworthy that the number of models in the Wilo-Stratos series is significantly larger than that of the Star-RS. They have the following ranges of basic characteristics:
- Maximum flow - from 5 to 62 m³ / h;
- Head value - from 4 to 17 m;
- Nominal pressure - from 10 to 16 bar.
The connection can be made both with the help of flange assemblies, and on threaded connections. The size of the latter varies from 1 '' to DIN-100.
Such a variety of models of Wilo circulation pumps for heating explains the large range of their cost - from 11,700 to 67,000 rubles.
During installation, carefully read the instructions for the specific Wilo heating circulation pump. It will necessarily indicate that, regardless of the chosen position, the shaft must be strictly horizontal. This is a prerequisite for normal operation.
Can I repair the pump myself if it breaks down? The video shows an example of restoring its performance:
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