Maintaining a comfortable temperature by opening windows and ventilating the rooms is not always possible and economically unreasonable. Expensive heat is used to heat the street, and drafts cause colds. The Danfoss temperature regulator for the heating radiator will help to solve the problem, automatically regulating the heat transfer of the battery in automatic mode.
About company
The Danish company Danfoss A / S is an international concern manufacturing thermal and refrigeration equipment. The company was founded in 1933, its headquarters is located in Norborg (Denmark).
The assortment includes automation tools for heat supply, ventilation and air conditioning systems of buildings. Factories produce shut-off and control valves.
Years of experience in the design and manufacture of specialized equipment allows the company to produce competitive products. According to experts, up to 30% of devices for thermal automation in Russia are supplied by Danfoss. All products comply with European quality standards.
Thermostat functions
Comfort means maintaining different temperature conditions in the rooms and rooms of an apartment or private house. It is impossible to do this in the conditions of centralized heating without regulating equipment for several reasons:
- The radiator has strict parameters and when the temperature of the coolant changes, it will warm more or less regardless of the owner’s desire.
- The coolant temperature is the same at the radiator inlet in all rooms of the apartment and depends only on the operation of the boiler room.
- If you supply too hot water (steam) in the rooms it will be hot, stuffy and dry.
The only way to control the microclimate is to install a thermostat.
Action algorithm:
- By changing the position of the adjusting head, set the thermostat on the Danfoss battery in the desired mode of operation.
- At a low temperature in the room, the regulator valve is in the open position and the coolant enters the radiator without restriction - the battery is operating at full power, the room is warming up.
- When the required temperature is reached, the controller gradually shuts off the heat carrier flow, directing part of the hot water to bypass the battery along the central riser - the battery gives off less heat, the temperature in the room goes down.
The speed and accuracy of the Danfoss thermostats for heating radiators depends on the design of the appliance.
Types of structures
Any designs of Danfoss radiator thermostats are built and operate according to a similar functional diagram. There are valves with manual and automatic adjustment.
In the case of manual adjustment, the user closes or opens the flow of coolant to the radiator as necessary. The method is inconvenient to use in autumn and spring, when the temperature changes significantly during the day.
The valve of the automatic device opens or closes when the air temperature in the room changes without human intervention.
The automatic device includes:
- Thermal head housing with a regulator located on it and a tuning scale.
- Bellows filled with gas condensate liquid or gas.
- The axle box valve that controls the valve.
- Valves for installation on pipes leading to the heat transfer medium.
The principle of operation is that, depending on the temperature of the air in the room, the gas in the bellows expands when heated or is compressed when cooled.During expansion, the movable part of the thermal head moves the stem and valve, changing the size of the hole through which the coolant enters the radiator. When cooling the gas in the bellows, the stem moves the valve to the open position - the battery heats up more.
As a bellows filler, special liquids, paraffin, gas or gas condensate are used. Research data from the Rhine-Westphalian Technical University show that gas-filled regulators have the best parameters in terms of speed and accuracy of the reaction.
The patent for the invention of gas devices belongs to Danfoss and only this company produces such equipment.
Key Specifications
For the user, consumer qualities of the product and its safety are important.
Any temperature controller on the Danfoss battery is guaranteed to withstand the following parameters:
- working pressure in the system - up to 10 bar;
- test pressure - up to 16 Atm;
- maximum coolant temperature - 120 degrees;
- temperature regulation limits - from 5 to 26 degrees.
When choosing, they pay attention to the connecting dimensions of the regulator. The company's assortment includes equipment for 10, 15, 20 and 25 mm.
There are cases designed for direct or angular connection, which are taken into account when buying. If necessary, purchase additional fittings.
When buying appliances powered by electricity, they pay attention to the way the regulator is powered: from batteries, mains, or from a power supply.
Advantages and disadvantages
Installers of heating equipment note the positive qualities of Danfoss radiator thermostats:
- Save up to 50% energy by maintaining the desired temperature in the room. This property is especially important in private houses or in apartments equipped with individual heat metering devices.
- Fast automatic response to changes in room temperature.
- Easy installation on any standard radiators, an affordable range of adapters and fittings for pipes of any size and any pipeline configuration. Installation on systems with lower, upper, angled inlet in one- and two-pipe systems.
- Reliability and long service life subject to operating rules.
- The presence of lock functions against unauthorized removal and disassembly, which is important for safety, especially to protect children from burns.
- Modern design.
- The possibility of acquiring a device with an external temperature sensor, which can be installed at a distance of up to 5 m from the radiator. The option helps maintain the desired level of comfort anywhere in the room.
As a disadvantage, a high cost is noted - the price of the cheapest samples starts from 15 Euros. Some users consider the negative side to be the upper limit of adjustment of 26 degrees, but the minimum number of people prefers this temperature.
The lineup
Danfoss has been manufacturing regulators since 1943. Since 2009, the series launched a single series of temperature regulators for radiators, indicated by the RA index.
In 2016, the company presented a line localized under the Russian market with the designation RTR. The devices are adapted for operating conditions in the heating plants of our country, taking into account the quality of the coolant and the parameters of the hydraulic pressure.
When buying regulators, the information contained in the instructions for the Danfoss automated heating regulator must be taken into account.
RTR control valves:
- Devices for a two-pipe system with pumps - RTR-N, with increased resistance. The device includes an installation adjustment device for performing hydraulic balancing of the heating system.
- RTR-G high throughput valves for pump single-pipe or two-pipe gravity heating systems.
In apartments and private houses, the RTR7000 series of devices, which includes the following devices, is most in demand:
- RTR 7090 and 7091 with an integrated temperature sensor and temperature control from 5 to 26 ° C, the 7091 series can be set to 0 ° C.
- RTR 7092 is equipped with an external sensor * and a device for fixing the minimum and maximum temperature (travel limiter).
- RTR 7094 - protected from unauthorized interference in the work, built-in sensor that prevents freezing.
- RTR 7096 is protected by a special casing, has temperature control restrictions, the sensor in the device is remote *.
The remote sensor is connected to the device by an ultra-thin tube up to 2 m long.
Liquid filled sensors are designated RTRW.
When replacing the sensors of the old RTD, RA series with RTR devices, use the table.
| New episode | Equivalent | |
| RTR 7090 | RA 2994 | RTD 3640 |
| RTD 3110 | ||
| RTD-R | ||
| RTD 7092 | RA 2992 | RTD 3642 |
| RTD 3120 | ||
| RTD 7094 | RA 2920 | RTD 3120 |
Replacement options for rarer regulators can be found in the appendix to the instructions.
Features of installation, configuration and operation
It is easy to install the thermostat yourself. If there are several radiators in the room, the device is installed on each battery or on the most powerful one.
If the radiator is not equipped with shut-off valves at the inlet and outlet, work is carried out only in the summer. If the battery can be excluded from the general circuit, the thermostat can be installed at any time.
Installation Algorithm:
- If necessary, turn off the heating, drain the water from the system.
- Marking is carried out taking into account the length of the pipes and adapters.
- If an extra pipe section has to be cut, a thread is made in the remaining section, a die of the required size is used. The necessary fitting is welded into the loop of polypropylene pipes.
- A sealant (linen, FUM tape) is wound on the thread and a valve is screwed. The arrow indicates the movement of the coolant on the case, it must be strictly adhered to.
- Depending on the modification, the seal is made with rubber gaskets or the conical part of the body. Abrasive grinding of joints is prohibited.
- According to the instructions, a thermal head is put on the regulator body.
- Perform a test run, eliminate leaks.
The final setting of the Danfoss thermal head for radiators is carried out after hot water is supplied to the heating system.
The manufacturer gives several important operating tips to achieve the greatest effect from the installed equipment:
- if several batteries are equipped with temperature regulators in the room, they are subject to simultaneous adjustment;
- when ventilating, the thermostat is turned off so that there is no increased heat consumption;
- in standby mode, the temperature is not reduced by more than 3 degrees compared to conventional indicators - the saved energy will be spent on re-heating the room.
Installing temperature controllers on heating radiators is a great way to solve the problem of saving energy resources and automatically maintain a comfortable temperature in each of the rooms of the apartment. Installation of devices is simple, does not take much time. It is important to choose the right device and follow the operating instructions - in this case, the device will last for several decades without breakdowns.
