Thermostatic elements. Review of thermostats from Danfoss Danfoss thermal head operating principle
Danfoss thermostat is a device that is widely used in various home and industrial heating systems. Such samples are distinguished by high quality, accuracy and ease of use.
Let's study their features in more detail so that you can also use these advanced mechanisms for your systems.
Description and purpose
Danfoss regulator- a device that is used to regulate the air temperature in a room. Such a device can be used in various heating systems, including those where water is the heat carrier.
The regulator allows you to manually control the operation of such a system, use heat economically, and also turn the entire heating system on and off. The thermostat is used both in home networks and in closed ecosystems such as greenhouses, or in factories. It is also used to operate refrigerators, air conditioners and other systems in which it is important to observe temperature regime.
1.1 Design of Danfoss thermostats
Danfoss regulator, regardless of its design. It is a small chamber filled with gas or liquid. This liquid or gas expands when exposed to temperature, pressing on the shut-off valve, which stops the flow of heating fluid into the radiator, causing the system to increase the temperature.
When the room cools, the liquid contracts and a reverse reaction occurs. This operating system is valid for all types of radiators, including products for refrigerators. Almost all products from this manufacturer work according to this principle, including Danfoss RTD and the Danfoss RA line, as well as many others.
2 Model range of Danfoss thermostats
Danfoss has enough wide range thermostats. Currently, its products include the following types of devices:
- thermostats for the design of regulators of the model range 013G4001-013G4009. Applicable for heated towel rails, as well as various sections of heating networks. Available in versions for right- and left-hand installation;
- Danfoss RTD 3640 is a type of model for heating systems. Designed for a two-pipe standard system. They have an RTD function to protect against freezing for the winter. This variety is suitable for home, industrial systems heating, but not for refrigerators. It has only 4 divisions, indicated by both Arabic and Roman numerals;
- RAX models with liquid filler. This series is also intended for heated towel rails and design radiators. The model is applicable to most modern versions of design radiators; it has divisions with both Arabic and Roman numerals;
All presented versions of thermostats are accompanied by a whole series of special accessories that simplify their installation, as well as further use.
Almost all thermostats released in this series are available in three various options: golden, white, silver. You can choose the type that suits your system, the valve and temperature jack work in almost the same way.
2.1 How to install a Danfoss thermostat?
The Danfoss regulator is mounted directly on the hot supply pipe of your heating system. Installation of any model, including the RTD 3640, RA, is easy. In this case you will have to work like this:
- We disconnect the system from the general power, cut off the pipe of the required size for installing the thermostat. Without this step, the installation will not proceed.
- Using special tools, we make a thread on the existing pipe onto which the thermostat will be installed.
- We treat the area with plumbing paste, and then attach the RTD 3640, RA or any other valve body to it.
- We connect the device itself to the valve, tightening the connection with a washer. Additional sealing is not needed here.
- We remove the fuse, set the thermostat to the maximum value of 5, then put a cap with a scale on it. It is important to install it until it clicks for the tightest and highest quality fit.
- We check the sealing of the system again, after which we can connect it back to common system supplies. Let the valve open and close once and you will be sure that the equipment is working correctly.
Installation of RTD, RA or other model is complete. Now you can use the device freely.
2.2 How to set up a Danfoss thermostat?
Setting up a device such as the Danfoss RTD regulator, RA is quite simple and accessible to all users. In order to do this, you need to study the temperature scale available at the end of the device (it may differ slightly depending on which version you are using). Then set the temperature you are interested in by simply moving the pointer on the device to the parameter you need.
You can also choose intermediate values if they suit you. Within a few minutes the valve will adjust to desired position, and the temperature in the apartment will come to the desired parameter, and you will be able to enjoy the most comfortable microclimate for you. The valve is adjusted in the same way for models for refrigerators.
2.3 Danfoss thermostat and its types (video)
Promarmatura XXI Century LLC offers the widest range of Danfoss products
The range of products includes: | | | | | | |
Danfoss is the world's largest manufacturer of radiator thermostats. Over the years, Danfoss has sold more than 300 million radiator thermostats worldwide, saving a million liters of fuel every day and preventing tons of environmental damage carbon dioxide, sulfur compounds and other harmful substances. Radiator thermostats pay for themselves in less than two years, and their standard service life is more than 20 years - an excellent opportunity to save money and energy.
Danfoss radiator thermostats are manufactured with built-in and remote sensors to ensure optimal operation; plus a wide range of valves and additional equipment make up widest spectrum our products.
Thermostatic elements RA 2000 series
Thermostatic elements of the RA 2000 series are automatic temperature control devices designed to complete radiator thermostats of the RA type. The radiator thermostat is a proportional air temperature controller direct action with a small proportional band, which are currently equipped with building heating systems for various purposes. The RA thermostat consists of two parts:
All thermostatic elements can be combined with any RA type control valves. The clip connection allows for simple and precise attachment of the thermocouple to the valve. Protective cover thermoelements RA 2920 and RA 2922 prevent their unauthorized dismantling and reconfiguration by unauthorized persons. Technical characteristics of RA type radiator thermostats comply with European standards EN 215–1 and Russian GOST 30815–2002.
Technical characteristics of thermostatic elements of the RA 2000 series
The main device of the thermostatic element is a bellows, which provides proportional control. The thermocouple sensor senses changes in ambient temperature. The bellows and sensor are filled with an easily evaporating liquid and its vapor. The adjusted pressure in the bellows corresponds to its charging temperature. This pressure is balanced by the compression force of the tuning spring. As the air temperature around the sensor increases, some of the liquid evaporates and the vapor pressure in the bellows increases. At the same time, the bellows increases in volume, moving the valve spool towards closing the hole for the flow of coolant into the heating device until an equilibrium is achieved between the spring force and the vapor pressure. When the air temperature drops, the vapors condense and the pressure in the bellows drops, which leads to a decrease in its volume and movement of the valve spool towards the opening to a position at which equilibrium of the system is again established. The vapor fill will always condense in the coldest part of the sensor, usually furthest from the valve body. Therefore, the radiator thermostat will always respond to changes in room temperature without sensing the temperature of the coolant in the supply pipe. However, when the air around the valve is heated by the heat given off by the piping, the sensor may register more high temperature than indoors. Therefore, to eliminate such influence, it is recommended to install thermostatic elements, usually in a horizontal position. Otherwise, it is necessary to use thermocouples with a remote sensor.
Selecting the thermostatic element type
Thermostatic elements with built-in sensor
When choosing a thermostatic element, you should be guided by the rule: the sensor must always respond to the air temperature in the room.
Thermostatic elements with a built-in sensor must always be positioned horizontally so that ambient air can circulate freely around the sensor. They should not be installed in vertical position, since the thermal effect on the sensor from the valve body and heating system pipe will lead to improper functioning of the thermostat.
Thermostatic elements with remote sensor
Thermostatic elements with a remote sensor should be used if: o the thermoelements are covered with a blank curtain; o the heat flow from the heating system pipelines affects the built-in temperature sensor; o the thermoelement is located in the draft zone; o required vertical installation thermoelement. The remote sensor of the thermostatic element must be installed on a wall free of furniture and curtains or on a baseboard under the heating device if there are no heating system pipelines there. When installing the sensor, the capillary tube should be pulled out to the required length (maximum 2 m) and secured to the wall using the supplied brackets or a special gun.
RAW series thermostatic elements
Thermostatic elements of the RAW series are automatic temperature control devices designed to complete radiator thermostats of the RA type. The radiator thermostat is a direct-acting proportional air temperature controller with a small proportional band, which is currently equipped in heating systems of buildings for various purposes. The thermostat type RA consists of two parts: a universal thermostatic element of the RAW series and a control valve with pre-set capacity RA-N (for two-pipe heating systems) or RA-G (for a single-pipe system).
The production program for thermostatic elements of the RAW series includes:
Thermostatic elements of the RAW series are equipped with devices for protecting the system from freezing, fixing and limiting the temperature setting. The RAW 5012 is equipped with an ultra-thin 2 m long capillary tube, which is wound inside the sensor housing and connects the remote sensor to thermostatic element. During installation, the pipe is pulled to the required length. The clip connection allows for simple and precise attachment of the thermocouple to the valve.
Technical characteristics of radiator thermostats with RAW series thermoelements comply with European standards EN 215-1 and Russian GOST 30815-2002.
To prevent unauthorized dismantling, the thermoelement can be fixed to the valve using a special lock (see Accessories).
Technical characteristics of RAW series thermostatic elements
The main device of the thermostatic element is a bellows, which provides proportional control. The thermocouple sensor senses changes in ambient temperature. The bellows and sensor are filled with a special heat-sensitive liquid. The adjusted pressure in the bellows corresponds to its charging temperature. This pressure is balanced by the compression force of the tuning spring. As the air temperature around the sensor increases, the liquid expands and the pressure in the bellows increases. At the same time, the bellows increases in volume, moving the valve spool towards closing the hole for the flow of coolant into the heating device until a balance is reached between the spring force and the liquid pressure. As the air temperature drops, the liquid begins to compress and the pressure in the bellows drops, which leads to a decrease in its volume and movement of the valve spool towards the opening to a position at which equilibrium of the system is again established. To eliminate the influence warm air From the heating pipe of the heating device, it is recommended to install thermostatic elements, usually in a horizontal position. Otherwise, it is necessary to use thermocouples with a remote sensor.
Thermostatic elements of the RAW-K series
Thermostatic elements RAW-K series- automatic temperature controllers with a small proportional band. RAW-K are designed for installation on thermostat valves from Heimeier, Oventrop or MNG, built into the design of steel panel radiators such as Biasi, Delta, DiaNorm, Diatherm, Ferroli, Henrad, Kaimann, Kermi, Korado, Purmo, Radson, Superia, Stelrad, Veha, Zehnder-Completto Fix. The thermostatic element of the RAW-K series has a liquid sensor with a temperature setting range of 8-28 ° C and is equipped with a device for protecting the heating system from freezing.
The Danfoss company produces 3 modifications of RAW-K series thermoelements:
The RAW-K 5032 is equipped with an ultra-thin 2 m long capillary tube, which is wound inside the remote sensor housing, connecting it to the working bellows of the thermostatic element. During installation, the tube is pulled to the required length. Thermostatic elements of the RAW-K series comply with European standards EN 215-1 and Russian GOST 30815-2002.
Electronic radiator thermostat Living eco
Electronic radiator thermostat Living eco® is a programmable microprocessor controller for maintaining a given air temperature, mainly in residential buildings served by a water heating system. The thermostat is designed for installation on the valves of radiator thermostats instead of traditional thermostatic elements.
Living eco® has programs P0, P1 and P2, which allow you to regulate the room temperature at different times of the day.
The P0 program maintains a constant air temperature throughout the day. Programs P1 and P2, in order to save energy, can reduce the temperature in the room at certain periods of time, which allows you to adapt the operation of the heating system to the lifestyle of the people living in it.
The Living eco® thermostat is supplied complete with adapters for installation on the valves of Danfoss thermostats, as well as most other manufacturers. Installing and configuring the Living eco® thermostat is easy; there are only three buttons on the panel.
The Living eco® thermostat is equipped with an open window function, which turns off the coolant supply to the heating device when the room temperature drops sharply, which reduces heat loss and thereby increases the efficiency of the heating system.
Main characteristics of the thermostat:
Pre-installed programs
The "long absence" function allows you to reduce the temperature in the room when it is not in use. The period of absence and temperature are customizable by the consumer.
The selection of programs and their settings are made in accordance with the instructions supplied with the thermoelement.
TWA series thermoelectric actuators
Thermoelectric mini-actuators of the TWA series are designed for on-off control of various control valves in heating and heating and cooling systems of local ventilation units.
The actuator is equipped with a visual travel indicator that shows whether the valve is in closed or open position.
TWA actuators, depending on the modification, can be used with valves of the RA, RAV8 and VMT series manufactured by Danfoss, as well as with valves from Heimeier, MNG and Oventrop, which have a thread for mounting the actuator M 30 x 1.5. If the actuator is used with other types of valves, the valve must be checked to ensure compatible geometry and proper closure. The supply voltage of the electric drive is 24 or 230 V. The valves can be normally closed in the absence of voltage (NC) and normally open (NO). In addition, the normally closed actuator with 24 V supply voltage is supplied with a limit switch (NC/S).
Thermostat valves with pre-setting RA-N and RA-NCX DN = 15 mm (chrome plated)
Control valves RA-N and RA-NCX are intended for use in two-pipe pump water heating systems.
RA-N is equipped with a built-in device for pre-setting its throughput within the following ranges:
Valves RA-N and RA-NCX can be combined with all thermostatic elements of the RA, RAW and RAX series, as well as with the TWA-A thermoelectric actuator.
To identify the RA-N and RA-NCX valves, their protective caps are painted red. The protective cap must not be used to block the flow of coolant through the heating appliance. Therefore, the handle (code no. 013G3300) must be used.
Valve bodies are made of pure brass, nickel plated (RA-N) or chrome plated (RA-NCX).
The technical characteristics of the RA-N and RA-NCX valves in combination with thermostatic elements of the RA, RAW and RAX series comply with the European standards EN 215-1 and the Russian GOST 30815-2002, and the connecting thread size complies with the HD 1215 standard (BS 6284 1984). All radiator thermostats manufactured by Danfoss are manufactured in factories certified to ISO 9000 (BS 5750) quality.
To prevent deposits and corrosion, the valves of the RA-N and RA-NCX thermostats should be used in water heating systems where the coolant meets the requirements of the Rules technical operation power stations and networks Russian Federation. In other cases, you must contact Danfoss. It is not recommended to use compositions containing petroleum products (mineral oils) to lubricate valve parts.
Adjustment to the calculated value is carried out easily and accurately without the use of special tools. To do this, perform the following operations:
Pre-setting can be made in the range from "1" to "7" at intervals of 0.5. In position "N" the valve is fully open. Installation on the dark area of the scale should be avoided.
When the thermostatic element is installed, the preset is hidden and thus protected from unauthorized changes.
Thermostat valve with presetting RA-N with press fitting
The RA-N valve is intended for use in two-pipe water heating pump systems with copper or stainless steel. Special crimping tools are required to connect the valve fitting to the pipeline. Valve body appearance and technical characteristics are identical to standard valves RA-N DN = 15 mm. The RA-N can be used with all types of thermostatic elements from the RA or RAW series, as well as specially designed thermostatic elements such as RAX and the TWA-A thermoelectric actuator.
The RA-N control valve is equipped with a built-in device for pre-setting (installation) its flow capacity Kv in the range from 0.04 to 0.73 m3/h.
To identify the valves, the protective cap is painted red. The cap should not be used to block the regulated medium. For these purposes, a special metal handle (code number 013G3300) should be used. The valve body is made of nickel-plated DZR brass and the pressure pin is made of stainless steel. The pin does not require lubrication during the entire life of the valve. The gland seal can be replaced without draining the piping system. RA-N should be used in water heating systems where the coolant meets the requirements of the Rules for the technical operation of power plants and networks of the Russian Federation. In other cases, you must contact Danfoss. It is not recommended to use compositions containing petroleum products (mineral oils) to lubricate valve parts.
High capacity thermostat valve RA-G
The thermostatic valve with increased flow rate RA-G is intended for use, as a rule, in single-pipe water heating systems with pump circulation of coolant that meets the requirements of the Rules for the technical operation of power plants and heating networks of the Russian Federation. The valve is not recommended to be used if the coolant contains mineral oil impurities.
The RA-G is equipped with a seal that can be replaced without draining the heating system. The pressure pin in the stuffing box is made of chrome-plated steel and does not require lubrication throughout the life of the valve. All versions of RA-G valves can be combined with any thermostatic elements of the RA series.
RA-G valves are supplied with gray (to identify them) protective caps, which should not be used to block the flow of coolant. Therefore, a special metal service locking handle (code no. 013G3300) must be used.
Set of thermostatic fittings X-traTM for heated towel rails and design radiators.
The X-tra™ thermostatic kit is specially designed for heated towel rails. It consists of a thermostat valve, a thermostatic element and a shut-off valve with drain function. The innovative self-sealing connection of the valves to the radiator is made using one-half inch threads. The valves and thermoelement are available in white, chrome and steel versions and are suitable for most heated towel rails. This set is the perfect complement to a heated towel rail. The attractive and compact design allows you to install the thermostat under the heated towel rail parallel to the wall, eliminating accidental impacts on it.
The range includes two types of thermostats with different principles regulation:
- RAX, which regulates the room temperature;
- RTX, which detects and regulates the water temperature leaving the heated towel rail. Used on heated towel rails and adjustable 5-10°C above room temperature, the RTX thermostat provides a constant temperature for drying towels.
The valve assembly is a body with a double-sided self-sealing fitting, which has two sealing rings: one to seal the connection between the fitting and the heated towel rail, and the second to seal the connection between the fitting and the valve body. The Allen screw serves to provide a seal between the valve body and the fitting. If the O-rings do not fit into the fittings of the heated towel rail, a traditional sealing material is used.
Advantages of our products
Save up to 46% energy
Radiator thermostats allow you to spend exactly the amount of energy that is needed in at the moment to maintain a comfortable room temperature. Different thermostatic elements cope with this task in different ways. Compared to a manual control valve, liquid- or paraffin-filled thermostats save 31%, and gas-filled thermostats save 36%. Using Danfoss living eco electronic radiator thermostats allows you to save up to 46% of heating energy.
*According to a study conducted by the Rhine-Westphalian University of Technology,
Aachen, Germany.
Fast response
Danfoss RA series thermostats are equipped with a gas-filled bellows. The heat capacity of gas is significantly less than that of liquid and, especially, paraffin. As a result, gas-filled thermostats respond much faster to changes in room temperature. Therefore, Danfoss thermostats maintain temperature with greater accuracy and provide greater energy savings. Radiator thermostats with a gas-filled thermostatic element (“gas”) are patented and manufactured only by Danfoss.
Easy installation and setup
A set of adapters will allow you to install the Danfoss living eco thermostat on most thermostatic valves present on the market. See for yourself by watching this short video.
Reliable performance
Danfoss thermostats are fully adapted to work in Russian conditions. More than 40 years of experience in operating thermostats in Russia allows us to confirm this. For the first time in Moscow, Danfoss thermostats were installed in 1964 at the Rossiya Hotel, where they served until its demolition
Safety of thermal heads for heating radiators
Thermal heads for Danfoss living eco heating radiators have a child lock function. Exploring the world around us will be safe even for the little ones.
Comfort in all rooms
The amount of heat each room needs varies throughout the day. In the morning the sun shines through the windows on the east side of the house, at noon on the south, and in the evening on the west. If you control the heating of the entire house based on the temperature in one room, the temperature in the remaining rooms will change throughout the day.
Now you can buy a thermostat with a modern design
Red Dot is a world-famous “quality mark” in the field of industrial design. Only products that are exceptional in terms of aesthetics and functionality are awarded this highly appreciated. In 2010, Danfoss was awarded the Red Dot award for the development of its living thermostats.
Installing a thermostat on a radiator is an opportunity to reduce heating costs, improve the microclimate in the house, and also carefully use the earth's energy resources.
The motives may be different, but the decision is being implemented more and more often.
Many people, when choosing an equipment manufacturer, choose Danfoss.
And not surprisingly, the products of a famous brand can easily be found on the shelves of many stores.
The production technology of their thermostats based on a gas-filled bellows is patented and used in the company’s own factories. If you also decide to purchase a Danfoss thermostat, the installation and operating instructions will come in handy.
The purpose of installing a thermostat is to maintain the air temperature in the house selected by the consumer.
The design of a thermostat for radiators includes two elements that complement each other:
- Thermostat (or thermostatic element).
- Danfoss thermostat valve.
The valve is connected directly to the battery, and a thermostatic element is installed on it.
The heart of the matter is the thermostat. It is he who reacts to changes in ambient temperature and affects the valve that blocks the flow of coolant.
Danfoss thermostat
Inside the thermostat head is a bellows (a corrugated chamber capable of changing dimensions) filled with gas. The gas, depending on the temperature, changes its state of aggregation (when cooled, it condenses). This leads to a change in volume and pressure in the chamber. The chamber decreases in size and pulls the spool rod with it, which opens a larger gap in the valve for the flow of coolant.
When heated, a reverse process of expansion and closure of the lumen occurs (the accepted standard is 2 V°C of air temperature exceeding the set one).
When the regulator scale is set to comfortable temperature, a certain compression of the tuning spring is established inside, which is interconnected with a certain gas pressure.
Danfoss produces bellows with gas inside, as well as liquid ones. The latter are more inert and react more slowly to temperature changes.
Types and symbols:
- RTS - liquid bellows;
- RTD-G - gas bellows for a single-pipe system, or a two-pipe system without a pump;
- RTD-N - gas bellows for two-pipe systems and systems with a circulation pump.
Radiator thermostat DANFOSS RA 2991
There are also modifications of thermoelements in which:
- Protection is provided against reconfiguration by random persons (an excellent option for public institutions and children's rooms).
- There is a remote temperature sensor connected by a two-meter capillary tube, which can be installed away from the radiator, buried in a niche or filled with furniture, which gives more exact result measurements.
- With a temperature range slightly smaller than conventional sensors for integration into a system where payment is made according to regulations.
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Floor heating system
Thermostats are also used for underfloor heating systems. A thermostat for heated floors is a must!
After all, when driving liquid into the floor contour, you need to lower its temperature from 60 - 90 V°C to a comfortable 35 - 40 V°C (in this case, the surface of the floor itself will be about 25 V°C).
Flow meters are powerless if the pressure in the system fluctuates, if the air is heated, for example, from the sun, and even if residents want to save on heating while they are away.
The thermomechanical regulator is best used for small rooms, about 10 m2.
For large areas use room thermostats with heated floor temperature sensors.
Installation of the thermostatic element
First of all, the valve is mounted on the radiator. To do this, the coolant supply is shut off.
- Markings are made on the supply pipe. The area that will need to be cut should be the same length as the valve body minus the threaded connections.
- The heating pipe is cut and the extra section is cut out.
- Using a die, or die, a thread is made on the outside of the cut pipe.
- The connection is treated with plumbing paste and fum tape.
- The valve body is screwed onto the resulting thread.
- Since the pipe cannot be twisted, an American union nut is twisted on the opposite side of the valve, and then screwed (with a hex wrench) into the radiator hose.
- The body of the device is screwed into its own union nut through a rubber washer. This connection does not need to be sealed in any way, the main thing is that it is clean.
- After the valve is installed on the radiator, the protective cap is removed from it (located perpendicular to the pipe).
The maximum temperature value is set on the thermal head, after which it is pressed onto the valve (until it clicks).
Sensor installation
As already mentioned, a remote sensor is needed if the battery is built into the wall or covered by something (furniture, screen, thick curtains).
A sensor and a setting unit are combined in one housing of this element.
- It is best to place the device on an open (but without drafts) section of the wall, at a height of about 1.4 m from the floor. You need to avoid places near appliances that can greatly change the temperature of the environment - air conditioners, stoves, etc.
- The device comes with a small mounting panel, which is secured to the selected location using a pair of self-tapping screws.
- A capillary tube is wound inside the sensor. It is pulled out to the required length so that the device reaches the fixed bar.
- The capillary tube is carefully fixed on back side valve
- The sensor is placed on the bar by simply snapping it into place.
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Setting a limit
The operation of thermostats is based on physical laws. Therefore, you need to remember that the conditions in which the device is located may make some adjustments (for example, distance from the heat source). There are indicative tables of correspondence between the regulator scale and temperature, which can be taken as a guide during installation. However, after the basic setup, you will need to “understand” your thermostat.
To do this:
- Set the temperature on the handle with marks.
- After an hour, control measurements are taken with a room thermometer at several points in the room.
- If the temperature is higher or lower, the readings on the handle are adjusted.
Proportional band - 2 °C. If you set the temperature to 20°, the device will maintain readings in the range from 20 to 22 °C.
Sensor after installation on the radiator
The two pins that are included with the sensor will help set the limits for the minimum and maximum positions of the thermoelement.
They are located at the bottom of the device:
- To set the limit at a mark, for example “3”, you need to pull out the limiter and set the sensor readings at the mark “3”. Then the pin is inserted into the hole, which in this position is under the diamond icon.
- The second limiting threshold is set in the same way. The handle is turned to the desired value, only the pin is inserted into the hole located under the triangle icon.
To do this:
- Both pins are removed.
- The handle is placed at the desired level.
- In this position, the first pin is inserted into the hole located under the diamond.
- The second pin goes into the hole under the triangle.
Danfoss thermostats have many positive feedback. This is a very easy to use device that does not require any attention after initial installation and configuration. But the result will be a more comfortable temperature in the apartment, and also, in some cases, significant budget savings.
Video on the topic
Heating and ventilation costs average 30-50% of the family budget. And the problem is not in the function itself, but in poor energy consumption. A convenient solution was offered by Danfoss - a thermostat for controlling the temperature in the house and the operation of the heating system. This device can be used in combination with almost all boilers, including heating devices with liquid coolant.
A thermal head is used at home, in an apartment, production premises, warehouses, closed greenhouses and conservatories, in a word, wherever a relatively constant temperature regime is required. Moreover, this applies not only to heating, but also to air conditioning. Thus, the thermal head interacts equally successfully with air conditioners, refrigeration equipment and other units responsible for temperature.
Design features
The main purpose of the Danfoss thermostat is to long-term maintain the user-selected temperature regime. The design of the device includes two main parts:
- thermostatic element or as it is also called - thermostat;
- valve.
The valve is first mounted on the battery and only the thermostat is installed on it. It is the second element that is the main one in the design of the device. It tracks temperature environment, after which it sends the necessary signal to the valve, which in turn opens or closes the coolant flow.
In the internal area of the Danfoss thermostat there is a bellows - a corrugated container filled with gas or liquid. When exposed to temperature, the filler begins to change size and press on shut-off valve. When the coolant flow in the heating units is blocked, the temperature begins to increase.
If the room has become very cold, the filler contracts and a reverse reaction occurs - the chamber pulls the spool rod behind it, which in turn opens the gap in the valve element for coolant to flow in.
The company produces two types of thermostats - gas and liquid. But the second option is considered more inert; it gives a signal to change the temperature regime much slower.
Types and symbols of devices
The type of filler and purpose are determined by the following abbreviation:
- RTS - liquid bellows
- RTD-G - gas device for one-pipe or two-pipe systems in which there is no pump
- RTD-N- gas device for one-pipe, two-pipe pumping system
In some models, in addition to the main function, there are a number of additional options. For example, the anti-interference program installed settings by random persons. The option will be convenient for installation in public institutions or children's institutions. The number of modes and types of functions vary depending on the selected modification.
Model range of devices
The company produces a fairly wide range of Danfoss heating temperature controllers.
The most popular variations are:
- Danfoss RDT marking 3640 - the device is intended for use on standard two-pipe heating systems. It is equipped with an RTD option, which prevents freezing of the main line during the cold season. Used in domestic and industrial conditions. It has four divisions with designations in the form of Roman numerals.
- The Danfoss RAX regulator is a liquid type of device that is used for installation on designer-type radiators or heated towel rails. It has attractive external parameters and a minimalist style. On the case there are only divisions with Roman or Arabic numerals.
- Living ECO with the function of monitoring the microclimate in the house. This is an improved series that is successfully used in commercial establishments and residential buildings. The peculiarity of the thermostat for a heating radiator is that it has a liquid crystal screen that provides all the necessary information about the coolant. There are also three main mode setting keys on the case.
- Gas appliance Danfoss RA-299 with automated temperature control is available in several color solutions. It responds quickly to temperature changes. It is used exclusively for equipping traditional heating systems.
- 013 G4 001-013 G4 009 - multifunctional series of devices suitable for both heated towel rails and various areas heating device. There are left- and right-handed types.
Each of the presented options is equipped with parts that simplify the installation of the device and its subsequent use.
VIDEO: Review of Danfoss thermostatic kits
Installation of thermal head
The Danfoss thermostat is installed directly on the “hot” pipe, which supplies coolant to the household heating system. Installation work do not have any difficulties, even when it comes to design variations, the installation principle is the same for everyone.
The following steps must be followed:
- Make a mark on the supply pipe to determine the area that needs to be cut. When doing this, take into account the dimensions of the valve body and remove the threaded element that will fit directly into the pipe.
- Turn off the heating and drain the water so as not to flood the house while working.
- Cut according to the marks unnecessary area pipes and make a thread on the outer part of the cut using a die.
- Treat the connecting part with a special plumbing paste from any manufacturer and a foam tool.
- Screw the valve element onto the thread that was made with a die, and then tighten it well with a washer. There is no need to additionally seal the joint area; this connection will be sufficient to prevent the pipe from leaking.
- Remove the fuse, set the thermostat to the maximum value of “5” and put the housing with the scale on top. The cap is put on all the way, the defining signal is a loud click, it indicates tight contact of the parts.
- Check all connections and connect the heating device back to the general heating system.
Check the operation of the Danfos regulator before opening and closing the valve device for the first time. If the installation was carried out according to the rules, there should be no problems.
How to adjust the device
Although all modifications of Danfoss thermostats have differences in external parameters, technical specifications, setting up devices is done using the same method. To implement this, you will need to refer to the operating instructions and study the designations of the modes indicated on the device body. Indicators may differ depending on which model is used.
Next, set the device to the desired temperature setting. To do this, move the torque element to the required mode. If a device with push-button control was installed, all manipulations are carried out by pressing the “increase” or “decrease” temperature keys.
You can also choose an intermediate parameter if it is more suitable for creating a specific microclimate in the house. After a few minutes, the heating system will adjust to the selected values and will heat the room until the desired microclimate is achieved. The valve is adjusted in a similar way for refrigeration units.
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