Taps for Danfoss radiators. Danfoss thermostat: principle of operation, instructions, reviews

Control valves for RA radiator thermostats are divided into two types: RA-N(for two-pipe pumping systems heating) and RA-G(for one-pipe pumping and two-pipe gravity systems) 1). The RA-N valve is a valve of increased hydraulic resistance with preliminary installation adjustment of its maximum throughput. Valves are produced with a nominal diameter of 10 to 25 mm, straight and angled, nickel-plated. In the Danfoss product range there is a modification of the valve DN = 15 mm RA-NCX with a chrome-plated body, which is usually used in conjunction with RAX thermocouples in chrome or color. RA-N valves CX are used in rare cases, and RA-N valves DN = 10 and 25 mm are not found in Russia at all practical application and therefore they are not presented in this manual. Angle horizontal and three-axis valves are used when it is necessary to use a thermostatic element with a built-in sensor and pipelines that supply the coolant to the heater are laid from below. The Danfoss product range also includes a RA-N valve DN = 15 mm with a spigot for press connection with copper pipeø15x1 mm, which is used in horizontal apartment heating systems. Technical information for valves RA-N DN = 10 and 25 mm, RA-NCX and RA-N DN = 15 mm pipeline accessories for hot water heating systems.” RA-N valves are supplied with a red protective cap.

Main advantage Danfoss valves type RA-N - convenience and accuracy of adjustment to the required hydraulic resistance (capacity). In valves manufactured by other manufacturers, the setting refers to the number of revolutions of the special tool from the "closed" position. In this case, it is impossible to determine the adjustment value visually without violating the existing position of the device. It will also not be accurate, since it is not clear how many turns, for example 3 or 3 ¼. The presence of a special tool complicates the adjustment work. Outwardly identical valves from different companies have different fixed settings. During installation, builders often confuse them and in the future they cannot fix the heating system. Some companies offer to do the setting not on the thermostat, but on shut-off valve by changing the number of revolutions of its stem. This is inconvenient, as it leads to an increase in the cost of work and a decrease in the accuracy of tuning.

The presetting device is a throttling cylinder connected to a rotary crown. Different positions of the crown and cylinder correspond to certain values ​​​​of the throughput of the thermostatic valve. On the crown, the numerical indexes of the positions of the tuning element are indicated. Setting indexes must be determined during the hydraulic calculation of the heating system and set against drilling on the valve body during installation and commissioning. The adjustment is made without the use of any tool. The adjusting device is hidden under the thermostatic element and, when it is blocked, is inaccessible for accidental readjustment. In case of possible clogging of the valve at low preset values, it is enough to turn the adjusting crown to the “N” position (fully open) and the valve is flushed with water. After that, the setting returns to its original position. Pre-setting values ​​are clearly visible on the crown (it is easy to adjust or check the correctness of the settings). Each valve has 14 fixed settings (settings 1 to 7, N and six intermediate positions).

RA-G - reduced hydraulic resistance valve without a device to limit its throughput. Valves are produced with a nominal diameter of 15 to 25 mm with a nickel-plated body. They also come in straight and angled versions. Valves RA-G DN = 25 mm are not presented in the manual, since they do not find practical application in Russia. Technical information on them is presented in the catalog VD.53.P17.50 "Radiator temperature controllers and pipeline fittings for water heating systems". RA-G valves are supplied with a gray protective cap. The RA-N and RA-G dampers are connected to the radiators with the help of threaded shanks with a union nut, and with the pipeline - through a union fitting. If necessary, a special version of the RA-N dampers can be used in heating systems - with an external connecting thread or with a fitting for a press connection with a copper pipe ø15x1 mm. Many Russian factories produce heaters with built-in Danfoss thermostatic valves. Among them is the Moscow plant "Santekhprom", which produces bimetal radiator"Santekhprom-BMN Auto" and convectors with a casing of the "Santekhprom Auto" series; JSC "Mechanical Plant" (St. Petersburg) - steel panel radiator type "Konrad-Thermo"; the Radiator plant (Kimry) - a steel tubular radiator of the RS type, etc. Convectors and steel radiators are equipped with thermostatic valves for both two-pipe and one-pipe heating systems. Other appliances with built-in thermostats are designed for two-pipe systems only. Danfoss thermostatic valves, built into the design of the heater, in their own way internal device and hydraulic characteristics are generally similar to the valves of the free-standing RA-N and RA-G thermostats. Specifications Russian heating appliances with thermostats are given in the passports of manufacturers heating equipment, in the relevant materials of Danfoss LLC, and are also included in the database of the Danfoss S.O. program. for calculation of heating systems on personal computers.

Main advantage of Danfoss type RA-G valves- high throughput (RA-G DN = 20 mm has Kv = 2.06 m3/h at Xp = 2 °C). This is important in single-pipe heating systems in order to achieve optimal values ​​for the coefficient of coolant flow from the riser to the heater. High throughput achieved through large area valve seat and increased stem travel (greater than 30% when using a thermostatic element with gas condensate filling compared to thermostats filled with liquid). These valves are the only ones with such a capacity that have the European quality certificate EN215. This is due to their ability to hermetically shut off the coolant flow through the heater when the temperature in the room exceeds the calculated one by 2 °C. In addition, the valve is unique opportunity in terms of maintenance: its seat and cone, if required, can be completely replaced on site (without dismantling the valve).

In many countries, up to 40% of energy resources are spent on the needs of ventilation and heating of buildings. This is several times more than in advanced European states.

The need to use

The issue of energy conservation is particularly acute, this is relevant against the backdrop of a constant increase in energy prices. One of the devices that saves thermal energy is a thermostat for radiators, its installation reduces heat consumption by 20%. To do this, the consumer needs to correctly select the design for the heating system, as well as carry out installation, you can find out about this by reading below.

Principle of operation

The Danfoss thermostat is designed to maintain a constant indoor temperature. For the first time such devices began to be used in 1943. The mentioned company is the market leader in the production and sale of such units. Structurally, the devices have 2 main elements, namely a thermal head and a valve, which are connected by a locking mechanism. The purpose of the thermal head is to determine the temperature environment, to regulate the effect on the actuator, the valve acts as the latter. It is designed to cover the flow of water that enters the radiator. This method of regulation is called quantitative, since the device can affect the flow of water that passes into the battery. There is another method, which is called qualitative, with its help the water temperature changes in the system. This is done through namely This element must be located in or in the boiler room. The Danfoss thermostat has a bellows inside which is filled with a temperature sensitive medium. It can be gas or liquid. The latter type of bellows is easier to manufacture, but does not show such speed as gas counterparts, which is why the latter have become so widespread. At the moment the air temperature level rises, the substance that is in the enclosed space acquires a more impressive volume, the bellows, stretching, has an effect on the valve stem. The latter is moved down the cone, which is designed to reduce the flow area. This effectively reduces water consumption. When the air temperature drops, this process proceeds in the reverse order, and the volume of the coolant increases to the optimum limit, and this is how the Danfoss thermostat works.

Consumer reviews

Depending on what type of heating system is used, as well as what installation technology, thermal heads and valves can be used to control the flow of water. different combinations. If we are talking about a one-pipe system, then a valve should be used, which is characterized by increased throughput and negligible. According to users, the same recommendation can be used in the case of a two-pipe gravity system, where water circulates naturally and is not affected by forced impulse. If you decide to choose a Danfoss thermostat, you can also install it on a two-pipe system, which is equipped with circulation pump. At the same time, according to reviews, the valve should have the ability to adjust the throughput. It is quite simple, and there is no need to use a special tool for this. After you have decided which valve to use, you should decide on the type of thermal head.

If you are interested in Danfoss - a thermostat, the installation instructions for which will be presented below, you can purchase it at an affordable cost. When determining the type of thermal head, you should be aware that it is offered for sale in some varieties. Thus, a thermoelement can be inside. Among other things, it can be portable. Sometimes the regulator is external. Devices are also programmable, in which case they are electronic. You can also choose an anti-vandal thermal head. According to users who have chosen a regulator with an internal sensor, this device should only be installed if it is possible to position it horizontally. Then the air in the room will freely flow to the body of the device.

For reference

After you have purchased a Danfoss radiator thermostat, you should familiarize yourself with the features of its installation in more detail. Thus, it is completely unacceptable to mount it on a radiator in a vertical position. In this case, the heat flux will constantly rise upwards, and elevated temperatures from the supply line and housing will affect the bellows. Ultimately, you will encounter the fact that the device will not work correctly.

Customer reviews on choosing a thermostat

Home craftsmen especially emphasize that in some cases it is not possible to install the device horizontally. Then it is recommended to buy a remote one that comes with a capillary tube. The length of the device is 2 meters. At this distance from the battery, it is recommended to place the device by mounting it on the wall. Buyers emphasize that the lack of the possibility of installing the regulator horizontally does not always indicate the need to purchase remote sensor. There may be others on this objective reasons. The Danfoss thermostat, the principle of operation of which was described above, cannot be installed behind thick curtains in any way, in this case, of course, best solution will be the acquisition of a remote sensor. Among other things, such a need arises when a heat source is located next to the thermal head or hot water pipes pass. You can resort to this solution, and when the radiator is under enough wide window sill. In this case, the thermoelement may enter the draft zone. Buyers claim that if at least one of the above conditions is met, then it is best to purchase a remote sensor.

Installation instructions

The Danfoss thermostat, reviews of which are presented in the article, must be installed according to a certain technology. The first recommendation is the exclusion of mounting the thermal head on the heater within sight. Batteries whose general power equal to 50 percent or more of all that are in the same room. Thus, when there are two heaters in the room, the thermostat should be on one battery, whose power is more impressive. If you are interested in Danfoss - a thermostat, the setting of which is quite simple, you can purchase and install it. The first part of the device, which is the valve, should be installed on the supply pipeline. If it is to be inserted into an already assembled system, the supply line must be dismantled. These works may involve some difficulties if the connection is made using steel pipes. The master will have to stock up on a tool for cutting the material.

Conclusion

A fairly popular company today in the market for relevant products is Danfoss. The thermostat (how to adjust it is indicated in the instructions) must be installed on the radiator. The thermal head is then mounted without using additional tool. It is very easy to do at home, in addition, it will save on the purchase of consumables.