So-called underfloor heating is excellentproved to be a system for heating private houses. Often you can find homes in which only a few rooms are heated in this way. But the increasing popularity is gaining a tendency to heat the entire floor of the house with warm floors. You can also find combined heating options - heated floors and the usual radiators.
Heating system that supplies underfloor heating, usuallyhas a temperature of about eighty degrees Celsius. For warm floors, such a temperature is unacceptable, since it can lead to damage to the flooring and interior, and people will not be comfortable in such a room. For such systems, the temperature is not higher than 40 degrees. Therefore, they provide node mixing Valtec. Below we look at all the details about it.
Should I install such a node?
Let's see how the average heating system is made. So, it consists of the following elements:
- Heating boiler.
- Heat carrier.
- High temperature circuit.
- The required number of contours for warm floors.
Как отмечалось выше, котел нагревает heat carrier up to 80-90 ° С, and the temperature of the floor itself should not exceed thirty degrees. Taking into account the height of the screed and the fact that the floor is provided on the floor, it turns out that the temperature of the coolant circulating through the pipes can be up to 55 degrees.
Accordingly, this can be achieved by connectingwarm floor contour to the external contour through the pumping and mixing unit (Valtec including). It should be added that their absence in the system of warm floors is allowed when the installation does not heat the liquid too hot, and also if the heating system is built without the use of circuits with high temperature.
How does the pump and mixing unit for underfloor heating
Let us examine the principle of operation of this elementdesigned for underfloor heating systems. We omit the process of heating the coolant by the boiler and proceed immediately to the stage of interest. The heated fluid approaches the collector of underfloor heating and, due to the presence of a special safety valve, stops if the temperature is too high. Pressure is formed, leading to the fact that the valve opens, letting in the cooled liquid from the return circuit (meaning the cooled liquid passing through the entire circuit). The valve closes at the moment when the temperature of the water in the reservoir becomes favorable for the system.
Let us consider the collector in more detail, which provides the optimum temperature in the heated floors and maintains the required pressure for the circulation of the coolant. Its main parts are:
- Safety valve, which was mentioned above. It is intended to be mixed when the water in the collector is unacceptably hot.
- Circulation pump that maintains water pressure, creating the conditions for uniform heating of the floor.
Also, the manifold assembly may have other auxiliary components, such as a bypass (a device designed to protect against overloads), various valves and air extractors.
Абсолютно точно, что смесительный узел installed to the contour of warm floors, but specifically with the place of installation is not so simple. It can be located either in the boiler room or directly in a heated room. Mixing knots differ in valves which in them are used. The most common are two-way and three-way.
Two way valve
Such valves are called feeding.The design of such an element includes a fluid sensor that checks the flow of coolant. If it becomes necessary, it stops supplying hot media from the unit.
As a result, for the mixture all the time water flowsreturn contour. When this liquid cools sufficiently, a portion of hot heat carrier is added with the help of a valve. Based on such information, it can be assumed that the system with such valves will never overheat, and the heated floor will last for a long time. The undoubted advantage is also a smooth adjustment, as the valve has a small flow capacity.
Many experts opt fortwo-way valves when installing the mixing unit. However, it is worth noting that for their application it is necessary to fulfill one condition - the area of the heated room should not be more than 200 square meters. m
Three way valve
This type of element is distinguished by the fact thatat the same time, it is also a bypass valve and bypass. Inside the three-way valves, the hot coolant and liquid from the return circuit are mixed. Also between the flow and return flow valve is located. Its position, respectively, regulates the flow of coolant.
This type of connection is universal, itSuitable for large systems (mixing circuit with a large number of circuits). However, it was not without flaws. There are cases when the thermostat gives a signal to the valve to open completely, and, accordingly, water with a temperature of up to 90 degrees flows into the collector. As noted above, such a temperature, together with sharp jumps, can lead to breakage, namely, to the fact that the pipes will burst.
Another disadvantage is the large bandwidth. This fact can lead to a sharp change in temperature even with a slight displacement of the valve.
Outdoor temperature sensors
Such devices are necessary in the system forautomatic adjustment of the coolant depending on weather conditions. For example, when it is cold outside, a signal is given to increase the temperature of the coolant, and in the case of warming, the sensor informs the system that the temperature of the floors can be reduced.
The design of the valve involves turning 90degrees A special controller divides these 90 degrees into 20 areas and monitors the state of the weather outside the window. If the temperature of the carrier does not correspond to weather conditions, then the valve is turned by the required number of divisions. Naturally, these manipulations can be done independently, but this is very inconvenient.
Mixing node layout
Consider the most popular knotting mixes. It should be said that there is a need for thermostats, flow sensors and valves for each of the manifolds.
Valtek pump and mixing unit is designed for one circuit. The average floor area of 20 square. m
Designations on the scheme
- Mixing valve
- Nipple 1- three quarters.
- Circulation pump.
- 1-1 / 2 inch nipple.
- ½ inch ball valve (n / o).
- 16-1 / 2 inch connector.
- Threaded to 3/4 inch-1/2 inch.
- A half inch keg.
- Half inch tee.
- 1/2 inch ball valve (bun / outdoor).
Valtek mixing unit with one circuit and automatic adjustment
Legend:
1. Mixing valve.
2, 16. Thrust 1-1 / 2 inches.
3, 8. ½ inch crane.
4,7,11,21. Connector 16-1 / 2 inches (bun.).
5,6,12,22. Metal pipe.
9. Nipple 1-1 / 2 inches.
10. Tee ½ inch.
13. Thermal head with remote sensor.
14. Nipple 1 inch.
15. Union nuts pumping 1 inch.
17. Knee ½ inch.
18. Circulation pump.
19. Extension ½ inch, 100 mm.
20. Thermal head sensor.
Node mixing "Valtek" with autoregulation, providing from two to four contours of warm floors. Heating area - from twenty to sixty square meters. m
Specification
1. Remote sensor on thermal head.
2. Mixing valve.
3. 3/4 inch crane.
4. Futorka on 1-3 / 4.
5. Tee 1 inch.
6. Nipple 1 inch.
7. Circulation pump.
8. Valve valve on the collector 1-1 / 2 inches.
9. Plug from the outside. 1 inch thread.
10. Manifold complete with 1-1 / 2 inch cranes.
11. Connector for connecting pipes and manifold 16-1 / 2 inches.
12. Metal-plastic pipe.
13. Cap nuts pump.
14. Thermal head sensor.
Consider some elements that can be supplemented by the scheme:
- Клапан балансировки вторичного контура, allowing adjustment of hot and cold water from the return circuit. Turns the valve with hex. In order to secure it and prevent displacement, it is set with a clamping screw. It is worth noting that in most cases it has a scale for measuring flow throughput.
- Shut-off valve for the radiator circuit that performs balancing functions. It is necessary to connect the unit mix with other parts of the heating system. A hexagon is also required to turn it.
- Перепускной клапан.A kind of fuse that protects the circulation pump in the absence of water passing through it. Its operation occurs after reducing the pressure in the system to a certain value.
Consider how the connection diagram of the mixing nodes
It should be noted that the schemes differ according to the principleheating systems, there are single-pipe and two pipes. Suppose there is a one-pipe system, in which case the bypass device must be constantly open. This is necessary in order for some amount of hot coolant to be able to approach the radiators. If there is a two-pipe system, then the bypass device will be constantly in the closed state, since there is no need for its operation.
A quick note:collector group does not have to be located to the circuit with radiators. After all, if we consider that a heated house of small size, the temperature of the coolant will not have time to go down while moving through the pipes. Consequently, the collector site can be installed in the opposite direction from the radiator circuit.
The cost of the finished site
Naturally, you can not suffer, collectingdo-it-yourself mixing site and purchase the finished product. After all, such a task will require careful study of various work patterns. Finished units can easily be found in hardware stores, for example, the Combimix mixing unit from Valtec. However, we must prepare for the fact that the price tag is unlikely to please the buyer. Although this price is justified: the purchase of a finished site will help protect the consumer from errors in the calculations, assembly and installation.
Let's say a few words about the most popular in Russiamanufacturer mixing nodes - the Italian company Valtec. A kit consisting of a mixing unit and a pump will cost about fifteen thousand rubles. The American counterpart from the manufacturer Watts Isotherm will cost about the same money. Those who are not afraid of difficulties and who have free time can try to assemble a mixing unit with their own hands from different parts.
Conclusion
After the full range of installation workis completed, it is necessary to connect the kneading unit to the contours. In this case, special fittings and adapters are excellent assistants. And it is very important to balance the system before the first launch.
So, we figured out how to install the mixing unit and what this item represents. Note that there are such elements of the order of 13-16 thousand rubles.
