How to connect a temperature regulator to the boiler

How to make a thermostat connection to a gas boiler. theory and practice

Thermostats are widespread in various spheres, both in industry and in everyday life. Most often these devices can be found in underfloor heating systems with a heating element in the form of a heating bundle, which is located in the screed. When the electrodes are energized, the wires are heated and give off heat to all surrounding layers, for proper operation the system is equipped with a temperature sensor built into the screed. The controller can be used for electric or water underfloor heating, the principle of its operation does not change.

The thermostat is also used in heating or heating boilers for automatic regulation of the level of heating of the internal environment. Many manufacturers complete heating devices with these devices already at the stage of manufacture, but even if the design of the boiler does not provide it, the controller on the fishing line for a trimmer can be installed by yourself.

What are the thermostats for electric boilers

What they are used for and how they are applied

Temperature controller is a wired or wireless control panel, which is mounted on the wall in any convenient location.

There are both simple mechanical models, which functional is a smooth regulation of the temperature (especially true for electric boilers with average 3 or 6 steps regulation of power) and automatic programmable models with information display, which allows setting over 50 parameters of the boiler, to program their change for the next day or even week.

connect, temperature, regulator, boiler

Automatic thermostats allow you to configure the boiler once and up to a whole or even several heating seasons.

In general, room thermostats for electric boilers perform such functions as:

  • measurement, control and maintenance of a certain comfortable temperature of the working environment;
  • transmission of signals to the electric boiler from any convenient place in the house for the owner;
  • protection against overheating or freezing of the heating system;
  • Programming the operation mode for the next day or week
  • Remote control from the phone in the presence of a Wi-Fi or GSM-module in the thermostat;
  • Remote notification (including via smartphone) of faults and emergencies in the heating system.

Existing types

The settings set on the thermostat, are of priority over the settings of the electric boiler. The principle of operation of the device depends on the type of temperature sensor used in it:

Mechanical thermostats

The simplest models, which are based on membrane and capillary temperature sensors. They use significantly expanding at the slightest temperature increase substances placed in a capsule. Expanding substance at reaching the threshold temperature exerts pressure on the relay membrane, resulting in opening of contacts, the thermostat signals a partial or complete reduction in power of the electric boiler.

The main disadvantages of these thermostats are their simple functionality. limited to turning the circular spinner to set the desired temperature and a high inaccuracy of up to 3-4°C.

Have a more complex design, based on which as a temperature-sensitive element using special metal plates that produce a micro-discharge when heated to a certain temperature. Micro-discharge actuates the electromagnetic relay, which controls a mechanical valve. In general, electromechanical thermostats have the same functionality, but a much smaller error, their cost is 20-40% higher.

The most modern and multifunctional devices equipped with electric boards (automation), often with remote sensors: both internal and external (outdoor). Can maintain or change the mode of operation of the electric boilers without human intervention. Allow for a minimum error of 0.5-0.7 degrees. We recommend electronic thermostats due to their functionality and economy.

Automatics of modern models is able to maintain the most economical mode of operation of the electric boiler, constantly adjusting its work to the temperature in the room, which completely prevents unnecessary power consumption. Because a decrease in temperature by 1°C is up to 5% savings.

Achieve maximum stability and comfort

An additional feature of many electronic thermostats is the possibility of organizing a weather-dependent control, when the boiler output is adjusted with a change in the temperature outside. To do this it is sufficient to connect a universal outdoor temperature sensor to the thermostat (2-2.5K). ).

It consists of a single construction: a sensor and a wire of 2-6 m in length. Therefore, it is sufficient to secure the wires in the appropriate contacts of the thermostat, according to the instructions.

connect, temperature, regulator, boiler


These devices have more serious design features. Special metal plates are used to work, which produce a small discharge when they are heated to a certain temperature. This results in triggering of the electromagnetic relay, which controls a mechanical valve. Functionality of these units is a bit more. it depends on the model, but they have less error. You will have to pay more for such a product than for a mechanical model.

temperature controler/temperature controller/digital temperature controller/temp control/thermostat

The most versatile devices that have electronic boards in their design. Such products have a fairly wide range of functions, characterized by minimal errors and high efficiency. Electric thermostats are able to control the electric boiler without the participation of the consumer. The cost of such devices is higher than in other models, but the price is quickly recouped through the savings during use.

Electric thermostats are highly sensitive to temperature changes, so they constantly monitor the mode of operation of the boiler, adapting it to new environmental conditions, if necessary.

Diagram of installation of wireless thermostat

Unlike other types, a wireless thermostat consists of two units:

  • Installed in the room and acts as a transmitter.
  • Is installed in the immediate vicinity of the gas boiler and connected to it via a valve or a special controller.

Data is transferred between units via radio signal. Control is realized by means of a keyboard located on the control unit. All mode changes are shown on the built-in display.

The main drawback of this category of wireless thermostats is the power supply, which is provided by separate batteries that have a limited life span and require regular replacement. When the batteries need to be renewed, a special signal is transmitted to notify of the imminent failure of the batteries.

How the room thermostat works

Any room thermostat, mechanical or electronic, radio or wired, or programmable, which we call a room programmer, works very simply, according to the principle of a one-button switch. “circuit open or connected”. “On/Off”.

It connects the contact when the temperature reaches the threshold, and the boiler control circuit is closed. When heating has occurred, the contact opens, the boiler stops.

The result in my own experience

The thermostat should be connected to 220V to take precautions when working with high voltage devices. i did not discover America, i only gathered all the information.

w1209 thermostat again takes the laurel branch of “people’s board”

WARNING. On a Baxi boiler, the terminal block for the thermostat connects PHASE to the control board. When connecting the thermostat, pay attention to the safety precautions when working with high voltages. De-energize the circuit before installing. Only use a 220V line cord. With intact braid!

brown wire connects to the black thermostat output after the fuse. brown wire is a phase

Diagram of connection of thermostat to heating boiler

Once the model is chosen, the question of how to connect the thermostat to the electric boiler or gas heating unit arises. Connection of the device is carried out according to the recommendations specified by the manufacturer in the technical passport of the equipment. It is only necessary to find the necessary section in the documentation, where you will find the method of connecting to the boiler additional devices and all the required diagrams.

On some models of thermoregulators, the scheme is shown on the back side of the decorative cover. All modern models of boilers have connection points for the thermostat, which will control the operation of heating equipment. The fixation of the device is performed by means of a terminal on the boiler at the corresponding point or using the thermostat cable (included in the kit).

According to the professionals, wireless room thermostats should be installed in living rooms away from the existing electrical appliances (TV, refrigerator, lamps, etc.). д.), because the proximity to the radiated heat from them can cause the device to malfunction. Some recommendations for installing a wireless thermostat for a gas boiler:

  • for correct measurement of the room temperature, free access of air to the thermostat must be ensured
  • do not cover the unit with furniture or heavy curtains;
  • place the device in the coolest rooms or in the living rooms where the occupants spend most of their time

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  • Avoid direct sunlight on the device;
  • Do not install the device near radiators or heaters;
  • You can’t have the devices in the area of drafts.

As a side note! Room thermostat sensors for heating are triggered when the room temperature changes by 0.25 degrees.

Thermostat installation and connection to the gas boiler Baxi ECO FOUR 24F

Hello to all subscribers and those who read my magazine! Today I want to share with you not the news about my machine, and about connection of the Chinese thermostat (thermostat) to the gas boiler Baksi Ekofur-24. The essence of the idea that I categorically did not suit the work of the boiler on a timer. For those who do not know what it is, let me explain. The essence of all boilers is the same. to work for space heating. And there is no difference what is used as a resource for heat production, gas, wood, electricity or liquid (oil, diesel, waste, etc.).д.). All boilers are trying to heat some heat carrier (liquid or air). In most industrial heating boilers, as the coolant is used liquid (water or antifreeze), and as a heater is used gas (methane or propane), solid fuel (wood, coal), electric heaters (electricity, heating elements either air or liquid. But, in the main, of course, gas boilers prevail. So, the boiler has a certain controller, which controls the supply of gas, as well as with the help of el.pump, performs the circulation of the coolant (liquid), in the heating system. In the boiler program laid down by the timer, ie the boiler turns on, the gas heats the coolant to a programmed temperature and turns off, then passes a certain time (preprogrammed) and the boiler turns on again, and the heating cycle repeats, then again turns off by temperature and again waits. And so it repeats around the clock in a circle. In Baksi boilers, time 3 minutes is programmed by default from the factory. In the menu settings of the boiler, you can change this value, but at most it is 10 minutes. That is, it is not difficult to calculate how many times a day you will turn on the boiler. In a day 24 hours multiplied by 60 minutes = 1440 minutes. As a result, we find that we need to find out how many minutes heats our boiler. There are many factors and depends on what the temperature outside, how insulated your house(what heat loss has, through the walls, roof, doors and windows), and what temperature you want to keep in your room, some like hotter, others like a little cooler. Well, round it up and say that the boiler works for heating 5-10 minutes, let’s say 10 minutes. Altogether in one hour, the boiler will turn on 3 times, i.e.е. will run for 30 minutes. and 30 minutes. will be on standby. That is, over the day, the boiler will turn on roughly 72 times and will work 720 min, and 720 min will rest.If the boiler will rest for about an hour, and work for 7-10 minutes, then the boiler will turn on 10-12 times a day! These are all rough calculations and a lot depends on the different parameters, but this is enough for us to make our comparison. Again, the more often your boiler is turned on, the shorter the life of the pump and heat exchanger. Therefore, after weighing all these depressing calculations in the calculator, decided that I’m not very happy with it all, and that something needs to be done about it. After talking with guys who deal with heating, found that there are different methods and different devices, again, some say that you need to put thermostats to control the boiler, while others suggest putting thermostats that control the coolant itself and are installed on the radiator cocks. In short, opinions are divided and in each method of regulation, there are pros and cons. I had to delve into the world dumpster to figure out what is what. After reading and watching Youtube it turned out that both methods are about equal energy savings. But the pros and cons are different, thermostat regulation of the boiler, allows you to save on gas and electricity, and the resource itself boiler (pump and heat exchanger), so that the boiler turns on less often. But the disadvantage is that in this way the system heats the coolant to 60-70gr, and then cools for about an hour (depending on the temperature outside), and here are temperature jumps in the system pipes and radiators can cause leaks at the connections. The second system of mechanical thermal headers, on the radiator cocks themselves, do not affect the timing of the boiler, and regulate the flow rate of fluid in the radiator heating, depending on the temperature of the air in the room. The disadvantages are that the life of the boiler is not affected and remains as in a simple system without the thermostat that controls the boiler. Well, here everyone must choose for himself, much depends on what heating system is obtained in each case. It is necessary to consult with installers. Although I think that if you combine both approaches, it will give even better results compared to using any one.But it requires additional financial costs!For myself, I chose a system with a thermostat, which will steer the boiler, and from this I decided to start saving money. Well, let’s start to implement? Let’s go!To start with a ride through our stores that sell gas equipment and its repair. The of the much-needed device shocked me! Well, first of all, it should be noted that thermostats are structurally divided into mechanical and electronic! The first. is just a mechanical crank, which at a certain temperature (which exhibited a thumb wheel) closes the contacts and turns on the boiler, there are even examples of such samples in which the built in screen, which displays the temperature.

Such thermostats do not require connection to electricity, easy to install and maintain. But they have a big temperature hysteresis, from 2 to 5 degrees. The second model is an electronic device with a screen and buttons with built in controllers. They’re more accurate, they have a one-degree hysteresis, and they’re very accurate. Like controllers and processors rule!PROGRESS! And, as there are different convenient functions such as time display, different weekly timers, to set the programs of thermoregulation of the boiler for the day, for a week, as can be portable (you can carry the control unit in different rooms) or controlled by Wi-Fi, as can control the heated floors, air conditioning, electric valves or taps, fans and coolers, in short, more technologies and useful functions. As a minus, these are more complicated devices, may malfunction (in electronic terms), requires a power supply (220V or batteries).

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