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Ball mixing unit for underfloor heating. Pumping and mixing unit VALTEC COMBIMIX. Ideology of the main adjustments. Rehau heated water floors

Comfort in the house is one of the most important components of arranging your own home. It's not only cozy atmosphere and modern technology, but high-quality ventilation, and most importantly warm and good climate. It is this point that deserves special attention.

Modern technologies offer ample opportunities for heating a house, and along with traditional central heating more and more often use the system "warm floor". Do-it-yourself mixing unit for underfloor heating, this is only part of the work that you have to do.

The collector is a kind of connecting pipeline, distributes the coolant in various heating systems. In simple words, it is just a pipe that can connect and connect other pipelines.

On all such types of connections, threads are applied on both sides: external and internal. The price of such a device depends on the manufacturer and configuration.

In a heating system for underfloor heating, the coolant is supplied to the collector, with the help of which it is distributed to all loops. After that, the coolant moves to the return manifold, which directs it to the boiler for heating. The process is repeated again.

Scheme and principle of operation of the mixing unit

The mixing unit includes a pump and a valve. But more advanced configurations are often found.

The circulation pump may be located on the boiler itself, but its power will not be enough. For underfloor heating, it is necessary to put a separate pump on the mixing unit. In this way, the temperature will be freely regulated and lowered from 70-90 °C to 35-50 °C.

In addition, there is a fuse on the mixer without fail, which turns off the pump as soon as the temperature in the supply exceeds the set one.

In the supply pipe, the water reaches 85 °C. Legend:

  1. Three-way valve;
  2. Pump;
  3. Temperature sensor;
  4. Check valve.

The return line is from the manifold. The temperature of the coolant in it is 40 ° C. On it is check valve which prevents backflow of water.

Thus, when the thermostatic device is activated, the damper will automatically open, thereby mixing more cold water from return. After normalization of the temperature, the damper closes.

2-way mixing unit

A two-way or feed mixer works according to the principle described above. After the thermal head is activated, it cuts off the hot water supply and mixes the water from the return. The floor does not overheat, thereby increasing its service life.

This type of mixing unit has a small throughput, so the adjustment of the water supply occurs smoothly, without jumps. Most of the craftsmen prefer this particular type of mixer. But, unfortunately, it is not suitable for heating areas larger than 200 m².

Three-way valve

It plays the role of a checkpoint in combination with the functions of a bypass valve. But, unlike him, inside the three-mover mixes hot water with cold return. As a rule, such devices are equipped with thermostats.

Inside, between the return and supply pipes, there is a damper. By opening or closing it, the water supply is regulated.

Do-it-yourself installation and installation of a mixing unit for underfloor heating

Due to the high cost of finished floor heating equipment, the profitability of assembling such equipment with your own hands is quite high. Unfortunately, not everyone will be able to cope with this task, but further information will be useful in any case. So, the material that will be needed for installation:

  • union nuts;
  • nipples;
  • air vent (manual);
  • thermometers;
  • check valve;
  • circular pump;
  • tees; Various types connections, etc.

The assembly technology consists in the installation of thermometers installed in the supply and check valves. Their task is to control the degrees of the transported liquid. The principle of operation of the remaining elements of the circuit has already been described earlier.

The pump, due to circulation, will support the process of heating water in the pipeline. Thanks to the installation of a bypass, the system will gain protection against overheating. The water drain valve, in turn, will protect the pipes from bursting in case of excess pressure.

After the assembly of the unit is completed, it is connected to the circuits using fittings. But before you start the system, you need to balance it.

Mounting Features:

  1. The assembled or factory mixing unit is mounted to the contour of the warm floor.
  2. Installation can be either left or right hand.
  3. The node can be attached in a special locker, in the room itself or in a specially designated room (boiler room).
  4. Install the pump first and temperature sensor.
  5. A mixing valve is connected to the supply pipe (“warm”), and a warm valve is connected to the return pipe.
  6. Balancing is done using test inclusions: at high or low temperature, it is respectively reduced / increased until it is normalized.

The underfloor heating is connected according to the diagram below. However, each connection case has its own characteristics. For example, with a one-pipe system, the bypass must be constantly open, but with a two-pipe system, this is not necessary.

Connection schemes differ in the presence and absence of additional elements, but this is not so important. The main thing is to know that valves, flow meters and thermostats must be installed on each group of collectors.

One of the "know-how" technologies is weather-compensated controllers. Thanks to them, the temperature of the warm floor is automatically regulated, depending on the weather outside. Special sensors every 20 seconds measure how many degrees it is outside and, based on this, they shift or do not shift the temperature of the warm floor by 4.5 °C.

At the end of the instructions, I would like to add a video that shows all the subtleties of installation:

Advantages of a warm floor with a mixing unit:

  1. Long service life. The only element in the system that is more prone to wear than the others is the pipe. The minimum term of its wear resistance is 50 years.
  2. Automated control, due to weather-dependent thermostats. The heating level is adjusted according to how cold it is outside at the current time.
  3. Ability to use manual mode. Suitable for those who prefer to control the temperature with their own hands.
  4. Impossibility of overheating of the system and rupture of pipes, due to the presence of temperature sensors and special valves.
  5. economy. When installing the system yourself, you can save a lot of money.

How to choose high-quality pipes for underfloor heating, read on

- why they are needed, how to choose, how to stack.

Correctly made calculation of a warm floor will allow not only to lay the system better, but also save money on materials. all the necessary formulas.



Most manufacturers of underfloor heating produce only one type of heating system - electric or water. This somewhat limits the choice of the buyer. But Rehau warm floors are devoid of this drawback. German company offers electric and water heating systems.

About Rehau

Rehau made its first steps back in 1948. Initially, the staff consisted of only 3 people. In the 60s, the production of PVC profiles, as well as pipes made of cross-linked polyethylene, was launched, which became a turning point in the development of the company.

Today, Rehau is a leader in the production of energy efficient systems for the construction of industrial and private facilities. The domestic consumer is mainly aware of the company, thanks to the metal-plastic windows offered by Rehau and warm electric and water floors.

Rehau heated water floors

The company offers a completely ready-to-install heating system. The basic package includes:

The performance of the mixing unit and manifold is guaranteed only if the system is installed using components from the same manufacturer.

Heated electric floors Rehau

Rehau electric underfloor heating is another unique development of the company. The buyer is offered a two-core heating wire and mats.

Regardless of the choice of heating system, Rehau electric underfloor heating has the following distinctive characteristics:

If you preheat the wire before laying the cable by connecting it to the power supply system, you can achieve greater elasticity of the braid and facilitate laying.

Pros and cons of Rehau underfloor heating systems

The main advantage of water and electrical systems heating, created by Rehau, is the following:
  1. Technical characteristics of underfloor heating Rehau– system parameters: power, heat transfer, performance are significantly superior to analogues from other manufacturers. Specially designed Rehau pipe fasteners facilitate installation and speed up the installation process.
  2. Complete system set- the consumer is offered installation kits for Rehau equipment, fittings and all other consumables.
  3. Quick installation - all components of the system, regulating and shut-off valves are perfect for each other. The use of additives and additives made on the basis of the factory accelerates the curing process of the screed and increases its strength. Plasticizer consumption from 0.6 l to 1 l per m².
  4. The Rehau pipe calculation method allows you to prevent material overruns and, accordingly, avoid unnecessary material costs.
  5. Durability and service life- pipes made of cross-linked polyethylene are guaranteed to last at least 40 years.
Both electric and water heated floors have good operational and specifications and attractive price. To date, Rehau's products in terms of the number of sales take a leading position in the heating systems market in the Russian Federation.

Description set of temperature control Rehau with constant parameters G1 (1")

Rehau temperature control kit with constant parameters G1 (1") ErP suitable for mounting on a Rehau HKV-D manifold. Designed for connecting circuits floor heating to the radiator heating system.

Includes:

    thermostatic valve Rp 1/2 with thermostatic head and immersion sensor: setting range 20-50 °C

    return connection r R/Rp 1/2

    energy efficient pump with immersion sensor for temperature limitation

    connecting elbow with air vent and thermometer

    tap KFE 1/2" for filling and draining the system

    included parts 1/2" for mains connection

Individual parts are assembled with seals and tested.

In the Torus online market you can buyRehau fixed temperature control kit 1"with delivery to any point of Ukraine and receive official guarantee from the manufacturer.

Delivery in Kyiv

Delivery of goods in Kyiv is free of charge (to the entrance) when ordering more than 4000 UAH. If the order amount is less than 4000 UAH - the cost of delivery is 80 UAH.

The delivery service in Kyiv works from Monday to Friday from 10:00 to 19:00, other delivery times are negotiated individually with your manager.

Buyers of our online market also have the opportunity to pick up the goods themselves at the company's office (04073, Kyiv, Syretskaya St., 9, business center "MAYAK", office 203) from Monday to Friday from 10:00 to 18:00.

Please note that, unfortunately, we cannot place the entire range of goods in the office, please coordinate your visit and pre-reserve the goods with the manager.

Delivery in Ukraine
Delivery of goods is carried out almost anywhere in Ukraine by the transport company "Nova Poshta" (You can see the list and addresses of branches here...). The goods will be shipped after the full payment has been made.

For prompt delivery and ease of payment in our Torus online market, you can use the "Return Delivery" (Cash on Delivery) service and pay for the goods upon receipt in your locality as soon as possible. Upon receipt of the order, you can check appearance and product packaging.

The cost of delivery in Ukraine is paid by the recipient. (You can calculate the preliminary cost of delivery →)

Cash

Produced only in national currency. You can make payment immediately after delivery of the ordered goods by our forwarder or make payment when placing an order in our office.

Cashless payments

Payment by non-cash payment carried out in the following way: after placing an order, the manager of our company by fax or email will send you an invoice, which you can pay at the cash desk of a branch of any bank or from the current account of your organization. For legal entities package of all required documents provided with the product.

Payment for goods upon receipt of the order(C.O.D)

For your convenience, in the Torus online market, you can use the "Return Delivery" (Cash on Delivery) service and pay for the goods upon receipt in your locality as soon as possible. Upon receipt of the order, you will be able to check the appearance and completeness of the goods.

The cost of the "Return Delivery" service is 2% of the order amount.

Underfloor heating systems, which few people heard about a decade and a half ago, have become firmly established in everyday life. modern houses and apartments, especially for those owners who are thinking about creating maximum comfort residence in their domain. In advertising newspapers there are a lot of advertisements for services for the installation of floor heating systems, but such is the “device” of many of our men that they simply “itch their hands” to do everything on your own.

So, in normal high temperature systems heating of water in the supply pipes usually balances at the level of 70 ÷ 80 ° C, and in some cases it can even exceed these limits. It is for such operating modes that thermal mains were created earlier and are now mainly being created, the vast majority of models of boiler equipment are produced.

But those temperature conditions, which are considered the norm for classical heating systems, are completely unacceptable in the operating conditions of "warm floors". This is due to the following circumstances:

  • If we take into account the area of ​​active heat exchange (almost the entire surface of the floor in the room), and add here also the very impressive heat capacity of the screed, in which the pipes of the “warm floor” are enclosed, then it is obvious that in order to achieve camphor temperature in the room, large heating is not required. .
  • The threshold for comfortable perception of heating the floor surface with a bare foot is also limited - usually a temperature of up to 30 ° C is enough for this. Agree, it will not be very pleasant if it starts to “bake” from below.

  • The vast majority of floor finishes used in living rooms are not designed for high heat. Exceeding the temperature above the optimum leads to deformations, to the appearance of gaps between individual parts, to the failure of interlocks, to the formation of waves or "humps" and other negative consequences.

  • High heating temperatures are quite capable of destructively influencing the state concrete screed, in which the pipes of the "warm floor" contours "rest".
  • Finally, elevated temperatures are not at all useful for pipes of laid circuits. It should be correctly understood that they are rigidly fixed in the screed, deprived of the possibility of free thermal expansion, and when high temperatures very strong internal stresses will arise in the walls of the pipes. And this is a direct path to rapid wear, to an increase in the likelihood of leaks.

Recently, models have appeared on sale that may well work in the “warm floor” mode, that is, give low-temperature heating. But does it make sense to buy new equipment if you can get by with the existing one? In addition, “warm floors” in their “pure” form are not used so often - usually they are combined with “classics” on the scale of one house. Putting two separate boilers? - very wasteful. It is better to improve your system somewhat by separating a section of “warm floors” from it, and on the border of this separation, just install the very pumping and mixing unit that will be discussed.

There is another circumstance that explains the need for a pumping and mixing unit. It is one thing to provide circulation in the main heating circuit, and another thing in the laid floor heating circuits, each of which reaches tens of meters in length, with numerous bends and turns, giving a significant increase in hydraulic resistance. This means that dedicated pumping equipment is needed, which, as a rule, is also included in the scheme of this unit, which, by the way, is also reflected in its name.

The principle of operation of the mixing unit

The task is clear - it is necessary, without violating the operating mode of the main heating system, to ensure that a coolant with a much lower level of heating circulates in the "warm floor" circuits. How to achieve this?

The answer suggests itself - by qualitative regulation, that is, by mixing a colder stream into a hot stream. A complete analogy with what we do repeatedly every day, adjusting the temperature of the water in the shower or in the kitchen faucet.

Underfloor heating prices

warm floor


With a hot stream - everything is clear, but where to get a chilled one? Yes, from the “return pipe” passing nearby, through which the coolant, which gave off heat in the heating devices or in the “warm floor” circuit, returns back to the boiler room. By changing the proportions of hot and chilled liquids, the required temperature can be achieved.

Of course, in terms of the complexity of the device, the mixing unit is very significantly different from a conventional household faucet. So the tasks before him are more responsible!

So, the mixing unit must be able to work without constant human intervention - automatically monitor temperature levels and make operational changes to the process of mixing flows, changing them quantitatively. Often a situation arises when there is no need for additional heat supply at all, and the equipment should simply “lock” the circuit, providing only the internal circulation of the coolant through it, until the required cooling.

One gets the impression that all this is very tricky for a non-specialist. Indeed, if you look at the factory-made pumping and mixing units offered for sale, then, at first glance, you can understand the intricacies of pipes, taps, valves, etc. - very difficult. And the cost of such assemblies looks very frightening.


But it turns out that only a few running schemes are implemented in practice, and if you understand the principle of their operation, it is quite possible to assemble such a pumping and mixing unit on your own. We will devote the next section of our publication to the analysis of these schemes.

It is necessary to immediately clarify one thing - this article is devoted specifically to pumping and mixing units, but the supply and return manifolds connected to them will certainly be mentioned, but we will not delve into their device. Just for the reason that this node of the “warm floor” system, namely its device, principle of operation, assembly and balancing procedure, still require detailed consideration in a separate publication.

Schemes of pumping and mixing units and principles of their operation

From the whole variety of schemes of such mixing units, five were chosen. The main selection criteria were ease of perception of the principle of operation and accessibility in self-manufacturing. That is, the proposed structures can be assembled from parts available for free sale, and this does not require special training - rather stable skills in carrying out ordinary plumbing installation.

The schemes, of course, differ, but for ease of perception they are made according to the same graphic principle, with the images and numbering of the same elements preserved. New parts that will appear in the diagrams will be assigned letter designations in ascending order.

In all schemes, one orientation is adopted - the supply and return pipes are on the left, and the exit to the "combs" - the underfloor heating collector - is on the right. The color marking of pipes clearly indicates their purpose. The collector itself in reality can be directly adjacent to the pumping and mixing unit (this happens more often) or even located at some distance from it - this depends on the characteristics of the room and the free space for placing the equipment. It doesn't affect how the circuit works.

Any pipes can be used, at the request of the master - from ordinary steel VGP to plastic (polypropylene or metal-plastic) or corrugated stainless steel. Some components will also change accordingly. So, for example, the diagrams show brass tees or bends, but they can also be made from other materials.

The corresponding thickened arrows with variable shades show the directions of the coolant flows.

SCHEME №1

In this scheme, a conventional thermal valve is used, as for heating radiators. The circulation pump is located in series.

The scheme is considered one of the easiest to install, but it is quite effective.


Let's go through the details and devices that make up the circuit in detail:

  • "a"– Pipes shown with color coding for ease of reference. As already noted, various types of pipes can be used, as long as they correspond in their characteristics to the operating conditions in the heating system.

- "a.1"- inlet of the supply pipe from the general circuit of the heating system;

- "a.2"- exit to the "return" pipe;

- "a.3"- supply to the collector of "warm floor";

- "a.4"– return of the coolant from the collector.

  • "b"- shut-off valves - ball valves. Important - they do not play any role in the process of adjusting the temperature or pressure in the "warm floor" system. Their functionality is limited, but at the same time - no less important. The presence of taps allows you to turn off individual nodes of the heating system when it is necessary, for example, to carry out any repair and maintenance work.

There are no special requirements for the design of shut-off valves for the mixing unit, except, perhaps, for the quality of their execution. But it is desirable to use valves equipped with an “American” union nut (as shown in the illustration), which will allow you to quickly dismantle the assembly without resorting to complex operations. Accordingly, at the input ("b.1" and "b.2") these union nuts must be on the side of the mixing unit.

Cranes "b.3" and "b.4"(between the mixing unit and the manifold) cannot be called mandatory elements of the system, but it is better not to spare money on them either. Their presence allows you to turn off the collector and completely dismantle the unit without knocking down the verified balancing of the circuits.

  • "in"- a filter for mechanical cleaning of the coolant (it is often also called an "oblique filter").

This element may not be installed, but only if there is complete confidence in the purity of the circulating coolant. Typically, filtering devices are provided at the level of the boiler room. Nevertheless, in order to completely eliminate the possibility of solid suspensions getting into the area of ​​\u200b\u200bfine adjustment of "warm floors", you can also play it safe.

Such a filter is inexpensive, but there will be a guarantee that no solid particles that can interfere with their correct operation will get into the valve devices of the mixing unit itself and the tuning mechanisms of the circuits. In addition, it should be remembered that solid suspensions in the coolant accelerate the wear of valve seals.

  • "G"– devices for visual control of the coolant temperature (thermometers).

The type of thermometer can be any - as convenient for the master. So, devices with probes are used that are in direct contact with the coolant. If it’s simpler, you can purchase an overhead model, but the measurement will already be carried out according to the temperature of the pipe wall. The thermometer can be liquid, mechanical with a pointer or even digital - it is convenient to use electronic systems control of heating systems.

The diagram shows an option using three thermometers:

— "d.1"- measures the temperature in the common supply pipe of the heating system;

— "d.2"- to control the temperature of the heat carrier supplied from the mixing unit to the collector;

— "d.3"- allows you to monitor the temperature difference at the inlet and outlet of the collector. Optimally, this difference should not exceed 7÷10 degrees.

This arrangement of devices seems to be optimal, as it gives the most complete picture of the correctness of the system. However, for reasons of economy, many craftsmen manage with fewer thermometers.

  • "d"- the main control element of the mixing unit of this design is a thermostatic valve. This is exactly the same valve that is usually mounted on radiators.

A little subtlety. On sale are valves for radiators, designed for one-pipe and two-pipe heating systems. In our case, for a mixing unit, a model for a single-pipe system would be preferable, as it is more productive. It is easy to distinguish it by a number of signs: such a valve has a slightly larger “barrel” diameter, there is a letter in the marking « G", and the protective cap is grey.

The direction of the coolant flow is indicated by an arrow on the valve body.

  • "e"- thermostatic head, which is put on the thermal valve (using an M30 union nut or a special type of fixation). Important - in this case, only a head with a remote sensor is required ( "g") connected to it by a capillary tube.

The design of the head is such that when the temperature changes, its mechanical effect on the thermovalve stem also changes - when it rises, the valve closes, when it falls, on the contrary, it opens the passage to the coolant.

How are thermostats for heating radiators arranged and how do they work?

In this publication, we will not dwell on these devices in detail. This is from those considerations that are discussed in detail in a separate article of our portal.

The temperature sensor is superimposed on the pipe - for this there are special spring clips. But the question immediately arises - where exactly should it stand?

There are two options, each of which is good in its own way.

— First option: the sensor is located on the supply pipe from the mixing unit to the "warm floor" collector. The advantages of this approach are that the coolant with a stable temperature enters the circuits, that is, the possibility of overheating is completely excluded. Disadvantages - the mixing system does not react in any way to changes in external temperature (unless, of course, the corresponding additional devices are placed on the collector itself). For example, when the room gets colder or the temperature rises, the mixing unit will still supply the coolant with a constant heating level to the circuits.

— Second option: the sensor is located on the return pipe from the collector to the mixing unit (to the jumper, in the area of ​​​​the thermometer "g.3"). Advantages - temperature stability in this particular area, that is, taking into account the heat already given into the room. But the level of heating of the coolant in the supply pipe to the collector will vary in accordance with changes in external conditions. It got colder in the room - the circuits gave off more heat - the thermal valve opened more, and, accordingly, vice versa. Disadvantages - the presence of the possibility of overheating in the circuits of the "warm floor". For example, after filling the system at its first start-up, too hot water will be supplied to the collector at first, until the screed warms up. Another option is too sudden cooling in the room (for example, emergency ventilation by opening the windows wide open) can also give an influx of coolant that is too hot for them into the circuits.

However, with thoughtful exploitation, all this negativity can be avoided. And even better - to provide areas for placement on both pipes in the places indicated above. Rearranging such a sensor is a minute task that does not require any tools.

  • "h"- plumbing tees, with the help of which a jumper is formed between the supply and return pipes - bypass ( "and"). Through this bypass, the cooled coolant will be taken off for its mixing. And the mixing process itself, in fact, takes place in a tee "z.1".
  • "to"- balancing device. It is recommended to install a valve on the bypass (you can even use a regular plumbing valve), with the help of which the system is fine-tuned after it is started, in particular, the required pressure and performance indicators of the circulation pump. The presence of such an adjustment allows you to “strangle” the flow so that there are no zones with excessive high blood pressure or, conversely, rarefaction. The pump will work in the most optimal mode, the noise of the system will decrease.

The optimal solution is to install not a plumbing valve, but a so-called block tap, such as is often placed on the “return” of a heating radiator. In terms of functionality, in principle, there is no difference, but in terms of ensuring the safety of settings, it is obvious. Balancing is carried out with a special key, and after that the adjusting device is closed with a protective plug. That is, playful children's hands will not reach him, for example.

  • "l" – circulation pump, providing the movement of the coolant along the contours of the "warm floor".

The main heating system, of course, has its own pumping equipment, but as a rule, a separate pump is allocated to “warm floors”, taking into account the length and branching of the laid pipe contours. The pump is conventional, and its parameters are calculated individually for each mixing unit - this will be discussed below.

Prices for thermal valves

thermal valve

Circulation pumps - device, principle of operation, selection of the optimal model

Heating systems with natural circulation are becoming less and less common - preference is given to schemes with installed pumping equipment. How it works, and with what evaluation criteria they approach its choice - read in a special publication of our portal.

  • "m"- plumbing check valve. This is a familiar detail that allows fluid to flow only in a given direction.

How much is it needed? In the mixing process, of course, it does not play any role, but to ensure the constant correctness of work, it can become useful. Imagine the situation - in the circuits, the temperature is such that no heat inflow is required, and the thermal valve is completely closed. But the pump continues to work, and the circulation in the circuits does not stop. And here the phenomenon of suction of the coolant from the common return pipe of the heating system is possible. But there the temperature is even much higher than it should be in the supply of "warm floor". Such an influx of unauthorized heat can greatly unbalance the operation of the mixing unit, but installing a valve completely removes even the slightest likelihood of such a phenomenon.

We now turn to the consideration of the principle of operation of this scheme.

The coolant comes from a common supply pipe, is further cleaned on the "oblique filter". On the thermal valve, the flow is noticeably reduced due to the covered valve, which reduces the cross section of the free passage. The thermostatic head is responsible for changing the position of the valve, transmitting mechanical force to its stem, depending on the temperature at the remote

The circulation pump works constantly, and in front of it, in the area of ​​\u200b\u200bthe “z.1” tee, a rarefaction zone is created, which draws in both the changing flow of the hot coolant and the cooled one from the return pipe through the bypass. The flows are connected precisely in the mentioned tee, mixed, and in this form, with the desired temperature, they are pumped further by the pump to the "warm floor" collector.

If the temperature sensor shows that the heating level is sufficient or even excessive, the valve will be completely closed, and the pump will simply pump the coolant in a circle, without its inflow from the outside. As the coolant gradually cools down, the valve will open slightly to add another "portion" of heat, so that the temperature reaches the required value.

As you can see, the influx of hot coolant with a well-established system will not be very large - in the normal position, with stable operation of the unit, the valve is barely open. But in the event of a change in external conditions, the thermal head will make the necessary adjustments.

In this scheme, the circulation pump is located in such a way that it completely pumps the entire coolant flow to the "warm floor" collector. This principle is called the serial arrangement of the pump.

SCHEME №2

The scheme largely repeats the first one, but instead of the usual thermal valve, it uses a three-way valve.


So, let's look at the design features:

Instead of the upper tee, a three-way mixing thermal valve is installed ( "n"), and the usual valve from the scheme, respectively, is removed. This device is controlled by the same thermal head with a remote sensor as in the first scheme. The position of the sensor also does not change - one of the two options mentioned above.


The mixing of flows takes place directly in the body of the three-way valve. It is designed in such a way that when the position of the rod changes, one passage opens slightly and the second closes proportionally.

It is necessary to pay special attention to one nuance. Such valves can be not only mixing, but, conversely, the separation principle of operation. In the diagram shown, a mixing valve is required, that is, with two converging flows. As a rule, there is a corresponding indication on the body of the product - arrows demonstrating the direction of the coolant flows.


The shown scheme may have another variation - the thermal valve is installed instead of the lower tee, but here, of course, there should already be a separating type of product. That is, the temperature will be controlled by changing the supply flow from the return.


Three-way valves may not require a thermal head - many models have their own built-in temperature sensors. True, some masters express the opinion that the system still works more correctly with a remote sensor, and the likelihood of emergency situations is much lower.

The diagram shows (translucent) also ("m1") installed on the bypass. It is necessary in cases where automation also controls the operation of the circulation pump. If there is no valve, then in idle circulation mode, the bypass becomes an ordinary uncontrolled jumper, which immediately affects the balance of the node and the operation of others. heating appliances heating systems. But in most cases, when the pump is constantly running, such a part is not required in the circuit, and many craftsmen generally consider it harmful, since such a valve creates additional hydraulic resistance.

When is it advantageous to use such a scheme with a three-way valve? As a rule, it finds application in large mixing units, to which several circuits are connected, moreover, of various lengths. One is justified in heating systems that are controlled by weather-dependent automation, since the change in parameters in them is not only due to the valve, but also due to a change in the operating modes of the circulation pump. In small systems, the use of such a scheme is not particularly welcome, as it will be more difficult to adjust.

SCHEME №3

Another variation of the scheme with a serial arrangement of the circulation pump. This time also used a three-way thermal valve ( "n.1"), but with a different layout - it mixes two streams converging along the same line and redirects them to the central pipe.


Such valves have the appropriate marking - arrow or color, which allows you not to make a mistake in choosing.


Otherwise, the scheme is a complete analogue of the previous one. There may be no bypass at all - a three-way valve is mounted instead, which saves considerable space, and the circuit is more compact.

SCHEME №4

This and the following scheme have a fundamental difference from those discussed above, and this fundamental difference lies in the location of the circulation pump


As can be seen from the diagram, no new elements appeared in it. The supply and return pipes from the side of the common system remained in place, but from the side of the collector they changed places. The bypass, of course, remains, but it turns out that the flows of hot and cooled coolant meet at its upper point. And on the bypass itself there is a circulation pump that provides pumping from top to bottom.

The principle of operation is as follows. The flow of hot coolant passes through the thermal valve, where it is dosed to the required amount, and meets in the upper bypass tee with the flow from the "return" of the collector. The pump standing on the bypass captures both of these flows and pumps them down. Thus, mixing takes place both in the upper tee and in the working chamber of the pump itself.

At the bottom of the bypass, at the tee, the flow is again divided. Most of the pumped coolant at the desired temperature is usually returned to the collector and then to the "warm floor" circuits. And the resulting surplus is simply dumped into the "return" of the main circuit of the general heating system.

- The performance of the system is reduced, since part of the mixed coolant is simply discharged into the "return" line.

- Such a scheme is much more difficult to balance, since it is necessary to achieve complete constant filling of the "warm floor" contours, without rarefaction areas, and send only the excess amount to the "return". Often this requires the installation of additional balancing elements, such as block valves or bypass valves.

Underfloor heating rehau (rehau) are one of the leaders among similar heating systems. If you choose and install correctly suitable option, you can provide a comfortable atmosphere in the rooms and long time do not think about heating in the room.

Additional equipment for underfloor heating Rehau

underfloor heating will make the kitchen more comfortable

Included with the basic materials for installing underfloor heating are additional elements that are used during the installation of the structure.

Tires RAUFIX

Underfloor heating installation:

Care and operating rules

Caring for a warm floor is not too laborious, but since the entire system is located in depth.

After proper styling underfloor heating and installation floor covering you need to wait a while, and then you can safely walk on the floor, install even rather heavy household items on it, since Rehau systems are reliable and have a high hardness index. You can read about materials for warm water floors.

Choose the right flooring

Avoid damage to the structure heating system, carefully operate free-standing items such as control units and other important equipment. If possible, children should be excluded from access to devices used to control and manage the supply of water and its heating in order to avoid sudden temperature fluctuations.

If necessary, maintenance and timely repair of the structure should be undertaken. Usually these actions are carried out by a competent master. Care warm floors Rehau is not important. The floor covering must be kept clean and in good condition. The entire system is buried in the floor, so the most important action required of users is to exercise care during operation. We also recommend that you familiarize yourself with the technology of installation, laying and installation of a warm water floor.

For and against underfloor heating, watch the video:

It is one of the leaders in the market of similar systems, as it differs not only in outstanding performance and ease of use, but is also quite economical, as it does not leave waste during installation and practically does not require repair. If you install it correctly, you can enjoy comfortable and reliable heating for a long time.