Automation of energy-independent gas boilers. Automation for gas boilers: types, principle of operation

When considering home heating options, the most common choice is to use gas boiler. If there is a main gas pipeline near the house, this heating option is considered the most economical and efficient.

When installing any heating boiler, including gas, automation is a mandatory component of the system. Such automation for heating boilers allows, without human intervention, to maintain the specified climatic conditions in the heated room and ensure optimal conditions operation of such a boiler.

What does automation for gas heating boilers consist of?

Typically, such automation includes the following elements:

• fittings These are actuators that, under the influence of commands, turn the boiler on and off, and also regulate its power;
• valves designed to shut off the gas supply;
• maximum and minimum pressure switch. Designed to protect the system when pressure drops or increases too much;
• thermostat;
• water and gas pressure sensors;
• controller - an electronic device that, based on the data received, calculates the optimal operating mode of a gas boiler and generates control commands.

Types of automation for heating boilers

From a power supply point of view, there are two types of automatics for gas boilers:

• non-volatile automation;
• volatile automation.

These two types of automation differ in that the first system does not require power from electrical network, and for the second one to work, electricity must be supplied

Accordingly, these two automation systems will include different elements.

Non-volatile automation is simpler and more reliable, as it does not react to a sudden power outage.

Non-volatile automation

Such automation systems include:

• ignition system, which uses a piezoelectric element;
• thermostat;
• draft and flame sensor.

Mechanical automation begins to work after starting the boiler. Depending on the temperature of the heated water, the thermostat changes the amount of fuel supplied to the burner. Structurally, the thermostat is a metal rod. It changes its length with temperature changes. Thus, it opens or closes the gas supply.

The draft and flame sensor is designed to interrupt the gas supply when the burner flame goes out or there is poor draft in the chimney. Structurally, such a sensor consists of a bimetallic plate, which, under the influence of temperature, changes its position and closes the gas supply.

The control and measuring equipment used in such systems is a pressure gauge and a thermometer. This system is configured manually.

Modern non-volatile automation systems for gas boilers can have much larger number nodes For example, Italian non-volatile automation has the following components:

• temperature switching and control system;
• flame protection system;
• setting device minimum flow gas;
• pressure regulator;
• thermostat with burner shut-off function.

Volatile automation

Volatile automation is more complex. Such an electronic system includes a larger number of elements.

For regulation in volatile automation, electromagnetic valves are used. The operation of these valves is carried out according to commands generated in the processor. Using a special display, the operator can select one of the possible modes. And the correct execution of this mode will be ensured by automation.

In terms of the functions performed, automation for gas heating boilers can be of two main types:

• room thermostat;
• weather-sensitive.

Room thermostat

In the first case, the main indicator for controlling the operation of a gas boiler is the room temperature. Depending on this temperature, the boiler operating mode is selected. When the temperature in the room drops, the boiler starts working, and when the temperature exceeds a preset level, it will turn off.

Thermostat designs may vary. For example, SEITRO's thermostat operates using a membrane sensor. At a certain temperature, the sensor closes and a switching command is sent to the gas boiler.

Thermostats can be installed in any convenient location in the room, and communication with the gas boiler control unit can be carried out using a cable or wireless connection.

SEITRO thermostat

A type of thermostat is a programmer. From such a programmer, commands are transmitted to the gas boiler throughout the day, in accordance with which its operating mode is carried out. The work cycle is repeated every day.

Weather-compensated automatic gas boiler operates based on temperature environment on the street. Appropriate adjustment of the automation allows you to maintain a constant climate in the house when the outside air temperature changes.

Weather-compensated automation

Basic automation functions

The main functions of the automatic gas heating boiler are the following functions:

• automatic start of the gas boiler;
• stopping the operation of the gas boiler;
• control and adjustment of burner power using an appropriate sensor;
• emergency stop of the gas boiler in case of any malfunction.

When you turn on the gas boiler, the automation first starts the hardware of the system. In this case, the temperature is measured and the amount of gas that must be supplied to the gas burner is estimated. On next stage the automation starts the gas fittings, as a result of which gas is supplied to the system. At the same time, a spark is ignited in the combustion chamber, which ignites the gas. Under the influence of the flame in the heat exchanger, water is heated, which is then supplied to the batteries.

One of the options is automatic sabc for a gas heating boiler

An important part of the automation system of a gas heating boiler is the safety subsystem. This includes:

• overheating protection;
• frost protection;
• anti-blocking;
• anticyclical function;
• control of flame and draft presence.

To protect against overheating, duplication of sensors is often used - a temperature sensor and a limit thermostat. To protect against freezing, when the water is cooled to a temperature of + 5 degrees, the automation lights the burner and heats the water.

Anti-blocking ensures that the pump automatically turns on every 24 hours to combat scale. The anti-cycling function assumes that the automation prevents frequent ignition of the burner, which reduces its working life. When a signal of lack of flame or draft appears, the automation system turns off the gas supply.

In volatile automation systems, the gas supply is turned off using solenoid valve, through which gas enters the burner. The valve automatically turns off if the gas supply stops. The disadvantage of such a valve is that when gas appears, it cannot open automatically and must be done manually. At the same time, in the event of a power failure, after the electrical circuit is restored, the system starts automatically.

Modern automation systems for gas heating boilers allow reliable and safe operation of gas boilers

In modern automation systems for gas boilers, system malfunctions are diagnosed automatically. The results of this diagnostic are shown on the display. This greatly facilitates and speeds up the repair of a gas boiler.

Bottom line

Choosing which automation to buy for a gas boiler it is necessary to understand that the most modern systems are energy dependent. If the customer has doubts about the reliability of the electrical network in his home, then it is necessary to consider the use of non-volatile automation systems.

Video review and honeywell automation for a gas boiler:

The presented video shows an overview of the 630 Eurosit automation for gas heating boilers

Regardless of what type of fuel is used for boiler equipment (working on solid, liquid or gaseous fuel), three rules must be followed when operating boilers:

• Correct operating mode of boiler equipment;
• Safe work;
• Regular monitoring of the operation of all mechanisms and their adjustment.

In order for the operation of the boiler equipment to be optimal and the heating to be stable, as well as to comply with all the above rules, SABC gas boiler safety automatics are used. It is thanks to the automation supplied with gas heating that constant control over the water temperature in the heating system and safety of boiler operation.

Rice. 1

Automation for gas boilers includes a number of important elements that ensure safe operation of the equipment:

• A sensor that detects the presence of a flame in the burner - if the flame dies out, a signal is given to shut off the gas supply;
• Sensor for registration maximum temperature water, if it overheats, the boiler stops working;
• A sensor for monitoring draft, which stops the operation of the boiler in cases where draft disappears;
• A system of thermal sensors for measuring the current temperature both in the boiler and indoors and outdoors (if used coaxial chimney);
• Gas valve responsible for gas supply.

It is also worth noting that the SABC automation includes a thermostat, with its help the heating is maintained in the desired mode and the power developed during operation of the boiler is adjusted. The automation design of a gas boiler varies depending on its type.

Automation operation for gas boilers

Frequently asked question, which people ask when they need to turn on the heating - how does the automation of a gas boiler work? For boilers operating on gaseous fuels, basic principle functioning is that when fuel is supplied to the boiler equipment, one of the types of ignition is turned on - electronic ignition or piezo ignition. An old boiler usually has piezo ignition.

Operating principle of gas boiler automation:

• The spark ignites the igniter (it should be noted most important rule: it is unacceptable to supply gaseous fuel to the burner; if the igniter does not light, this is fraught with an explosion!);
• Then the main burner is ignited by the igniter;
• After the main burner starts working, heating of water in the boiler begins, and it continues until the set parameters are reached - for example, water temperature;
• When the specified parameters are reached, the operation of the main burner stops - the automatic control system for the operation of the gas boiler is responsible for this;
• After the main burner is turned off, the temperature inside the boiler equipment gradually decreases;
• At the moment when the lower limit of the coolant (water) temperature is reached, usually 40 degrees Celsius, the thermal sensor sends a signal, as a result of which the supply of gaseous fuel (propane-butane mixture, natural or liquefied gas) into the main burner, its operation resumes.

The safe operation of equipment depends on whether the operating principle is carried out correctly. Both the design, the principle of operation, and the automation circuit of a gas boiler must be at hand. They will be needed for maintenance and repair (for example, if there is a malfunction of parts such as the Italian gas valve 630 Eurosit).

Automatic device: varieties

There are two main types of SABC automation: volatile and non-volatile systems. The first type of automatic systems for gas boilers is used to open or close the gas valve, and the signal is supplied by a thermal sensor. The operating principles of volatile and non-volatile systems differ.

There are several types of volatile automatic SABC systems (the operating scheme of each of them is different):

• Room thermostat.
• Daily programmer.
• Weekly wireless programmer.

The first type of volatile automation SABC is connected to boiler equipment using a cable. The thermostat is controlled using a temperature sensor.

The second type of SABC device is connected to boiler equipment using a cable or wirelessly. The third type of automatic SABC device for gas boilers is connected wirelessly; the device operates at a distance between the receiver and the transmitter.

If non-volatile automation SABC is used, the operation of such heating equipment is possible in any conditions - such heating is used where there are power outages. If previously the adjustment of non-volatile systems was quite complicated, today the Italian gas valve 630 Euro Sit is used, which is distinguished by such qualities as safety and operational reliability.

The monitoring and control circuit includes emergency sensors, an electronic circuit and an electronic control unit, feedback circuits, and actuators. Under different brands Various types of automatic gas boilers are produced.

Common brands of automatic gas boiler equipment SABC:

• Vakula.
• Honeywell.
• Orion.

Each of the above types of equipment includes an Italian valve 630 Eurosit. First of all, it is worth noting the Vakula automatic device.

Automation for boilers Vakula

A type of automatic device for boilers operating on gaseous fuel is produced under the Vakula brand. A gas burner device associated with the Vakula automation is used to heat the coolant (water), or structural elements heating equipment.

Rice. 2

The Vakula automatic gas burner device includes a gas valve 630 Eurosit (SIT - Italian manufacturer).

Automation for gas boilers Vakula has a number of advantages:

• The pilot gas burner is ignited using a piezoelectric element;
• The temperature of the coolant, that is, water, can be adjusted in the range from 40 to 90 degrees Celsius;
• Both maximum and minimum gas flow can be adjusted;
• It is possible to regulate the gas supply to the pilot burner;
• The automatic Vakula device can operate even if the gaseous fuel pressure is reduced;
• In cases where the gas is suddenly turned off, the thrust disappears or becomes reversed, the Vakula device automatically turns off.

Depending on what digital indices are added to the Vakula brand, the technical characteristics of the device change. It is important to note that the Vakula-20 marking indicates the developed power (measured in kW).

Automation Orion

Automation for gas heating boilers is produced by various manufacturers. It is worth noting the automatic equipment for boiler installations of the Orion brand. This easy-to-control automatic system is installed in the gas burner device of household boilers operating on gaseous fuel. The Orion device is easy to use and reliable in operation.

Most often, a special gas valve of the Orion 20 brand is used. This type of automation is equipped with two important elements– piezoelectric ignition and an electrical sensor that registers the presence or absence of draft.

Orion 20 automation performs a number of functions:

• Turning off the gas supply - if the burner flame goes out or the draft disappears;
• The ability to instantly interrupt the supply of gaseous fuel to the boiler;
• Maintaining the temperature of the coolant - water at the required level;
• When the temperature in the boiler drops, it ensures automatic resumption of operation of the main burner;
• When the set water temperature is reached, the burner is switched to the “reduced flame” mode and then turned off.

It is also worth noting several technical characteristics. The device weighs 1.5 kg, the magnetic plug current does not exceed 200 mA, and the opening current is at least 20 mA.

Automation Honeywell

Honeywell automation for a gas boiler is a very common automatic system for boiler equipment. High quality automatic system Honeywell has been proven for over a century. The fact is that the German company Honeywell was founded in 1885, and over its long history this old brand has gradually become one of the leaders in the production of various automated systems.

Rice. 3

If we talk about the cost of Honeywell products, prices fluctuate in a very wide range. The cheapest automated Honeywell systems for gas boilers cost approximately 40 - 60 dollars, they have a device for manual switching temperature conditions.

These cheap types of Honeywell automatic equipment have a number of features:

• Automatically maintains water temperature in the range from 40 to 90 degrees Celsius;
• Automatic shutdown of the boiler installation if the gas supply stops;
• Automatic shutdown of the boiler installation if the draft disappears or reverse draft occurs;
• Honeywell's automatic device stops supplying gaseous fuel if the burner flame goes out (often an Italian gas valve 630 Eurosit is used).

Honeywell automated systems for gas boilers are available in a wide range. In addition to the above-mentioned economy class systems, you can purchase premium Honeywell systems. Gas heating using automated system Honeywell a good choice.

Possible automation malfunctions

In automatic systems 630 Eurosit (Italian gas valve, it is used to control the operation of gas boilers) a malfunction occurs for one reason or another.

The most common malfunctions:

• The torch on the boiler pilot burner does not light up - there is a malfunction of the electrodes, or a malfunction of the burner itself is also possible (before repairs, you should also inspect the old filter - it may be clogged);
• The pilot burner torch goes out immediately after the thermostat control knob is released - there is a malfunction of the thermocouple, or a malfunction of the draft sensor is also possible;
• The ignition and main burners turn on at the same time - there is a malfunction of the gas valve;
• The automatic system does not turn off the boiler, despite the fact that the water temperature has reached 90 degrees Celsius - a malfunction of the temperature sensor;
• 5Complete shutdown of the automatic system when the water temperature is from 40 to 80 degrees Celsius - the fault lies in the chimney;
• After the boiler has started operating, it is not possible to achieve the required temperature;
• Both the pilot and main burners have unstable flames;
• After the boiler has started operating, the required temperature level is not reached, soot appears - perhaps the boiler is old (it has been in use for a long time).

The Italian gas valve 630 Eurosit can be replaced in two ways: warranty and non-warranty. Warranty replacement of a faulty valve is carried out by the manufacturer of the boiler installation. More often, however, non-warranty replacement of automatic equipment is carried out at the expense of the owner of the boiler installation. The reasons for this may be traces of corrosion or a crushed thermal cylinder.

Today, many users have brought the system into their homes. individual heating. It gives many undeniable advantages over centralized heating. The user will be able to independently set all the desired operating parameters and control the indoor temperature level. For this purpose, we use automation for gas boilers, which allows you to set flexible settings and change them at any time depending on the situation. The product also increases the reliability of the heating system.

Possibilities of an electronic heating system

In addition to significant expansion functionality boiler, safety is also increased due to automation. The electronic control system has many monitoring sensors, which in the event of emergency situations will stop the gas leak and notify the user of an error. The possibility of emergency shutdown without human intervention will avoid any consequences. You just need to call a specialist or carry out diagnostics yourself.

Majority modern products are equipped with a control device at the factory. This allows you to ideally select all operating parameters and enter them into the basic settings. The user will then only have to choose the mode that is most convenient for him. And here gas automatics for an old boiler it will require self-installation. And here the main thing is not to make a mistake technical specifications existing device.

In principle, the devices have high degree universality, but it cannot be said that they are suitable for any product. Yes and a large number of manufacturers also requires detailed study. For example, Italian automation for a gas boiler or SABC cannot be compared. But the domestic model can be easily installed on any old boiler, but with an imported analogue you will have to tinker a lot.

Some trading companies give users the opportunity to assemble their own boiler from existing components. In this case, you need to find the most optimal option from an economic point of view. It is also important that the control unit can reveal the potential of the boiler. For example, when choosing Honeywell automation for Zhukovsky gas boilers, you can waste money. All the same, the technical capabilities of the heater will be very limited, and most functions will remain unclaimed. This leads to large financial losses.

Design and principle of operation of the system

The automation device for a gas heating boiler and its diagram can be studied below:

• 1. Initially, the gas passes through the cleaning filter and enters the solenoid valve, which regulates the fuel supply to the burner.
• 2. Near the valve there are temperature and draft sensors, which ensure that all operating indicators are within the established limits.
• 3. The thermostat with bellows and rod is used to set the desired temperature parameters. For this purpose, there is a special control button on the block.
• 4. The multi-level control system reads information from all sensors and, depending on the data received, makes a decision on the further operation of the boiler.

The operating principle of automation is based on the laws of physics. When the heat exchanger cools down 10-15 degrees below the set temperature, the gas supply sensor is triggered and the burner begins to intensively heat the water. When the required level is reached, automatic shutdown in order to save fuel. All data is transmitted in the form of electromagnetic pulses, which do not interfere with other equipment and do not harm humans and pets.

After installing the boiler, it is necessary to adjust and configure its automation. This can be done by the technician who installed the heater, and without additional payment. But if desired, the client can refuse the service and take matters into his own hands. To cope with this task, it will be enough to read the instruction manual, which describes the procedure in great detail. For clarity, you can look at pictures or find a video on the Internet.

Features of repair and replacement

Repairing automatic faults in household gas boilers is quite challenging task. It will be necessary to diagnose and check each element of the system to identify problem area. Malfunctions are most often associated with filter contamination or sensor burnout due to sudden voltage surges. Cleaning should be entrusted to a professional, because inept manipulations can lead to further big problems, and then you will need to buy a new unit. But install new ones electronic elements possible without outside help.

Replacement of the gas boiler automation unit is carried out only in the most extreme case, when it is impossible to repair the device. It is almost impossible to bring the device to such a state, so more often the unit is changed simply because of low functional equipment and a more structurally advanced accessory is installed.

This is often done when purchasing domestic heaters. The standard automatic equipment is removed, and an imported one is installed in its place. But you need to take into account that perhaps not all functions will work due to design features the boiler itself.

The price of automation for gas boilers Concord and Lemax will be 3-5 thousand rubles. For other models, the value will be approximately the same, but it is better to find out the current cost from official dealers.

In contact with

Classmates

Modern automation ensures reliability and high operating efficiency of gas boilers. Automation allows you not to worry about the safety of the boiler, and makes its use comfortable and economical. The owner does not need to constantly pay attention heating equipment, since the system is automated. Thanks to the ability to fine-tune the devices, the owner can easily set and change operating parameters.

An automatic gas boiler can even turn off on its own in the event of an emergency. Automation devices clearly set combustion parameters and fuel consumption. This gives the owner the opportunity to save money on space heating.

Automation SIT 630 EUROSIT

Automation for heating units can be divided into:

• volatile (operating from the power supply network);
• non-volatile (mechanical devices).

Types of volatile systems

An autonomous gas boiler involves the installation of complex electronic devices dependent on the power supply network. These devices are self-configuring fuel supply, flame power.

Room thermostats

Volatile systems automation presented the following types devices:

• room thermostat;
• daily programmer;
• programmer for a week.

Room thermostat Mounted in a room where the temperature needs to be controlled. Sensors take measurements.

When the temperature drops, the thermostat reacts and sends a signal to the gas boiler. The boiler starts.

Upon reaching optimal temperature indoors, the valve closes and the gas boiler stops working.

The room thermostat is connected to the unit using a cable.

Daily programmer. The functions of this device are the same as those of the thermostat, but it is possible to set programs for the day. The programmer also works with the hot water supply system. After 24 hours the cycle resumes.

The device is connected to the gas unit using a cable and via a radio channel.

Programmer for a week. Such a weekly device has more possibilities for changing the indoor climate. There are built-in modes and those that can be configured manually. The action takes place within a radius of 30 meters or more. Data can be monitored on the backlit display.

Devices can be selected by color depending on the design of the room.

Devices modern type can not only control the temperature, but also conduct independent diagnostics of equipment. They control the performance of the pump and protect the gas boiler from freezing.

Weekly programmer Auraton 2030

Operating principle of non-volatile automation

Energy-independent devices are autonomous, they do not care about the presence of an electrical network, they have easy manual control. After the owner has independently set the required temperature, heating is maintained automatically, that is, by adjusting the gas supply to the burner.

Automation for a gas unit functions in this way: in a working boiler, using a thermostat, which is connected to a valve and supplies fuel to the burner, the compliance of the temperature with the set parameters is monitored. Thermocouple installed in the heat exchanger records the temperature of the coolant. The main element of a thermocouple is an Invar rod. It is sensitive to temperature changes. The rod acts on the valve that adjusts the gas supply; it lengthens when heated and becomes shorter when cooled.

As the temperature rises, the flow of fuel becomes less - and the flame goes out until the rod becomes cold.

The principle of operation of draft and flame sensors is similar to the operation of boiler automation when the temperature of the coolant changes. One sensor is sensitive to deterioration in smoke draft, the other - to a strong decrease gas pressure in the pipe. The principle of operation of the automation is the same: expansion or deformation of the material under strong heating. The draft sensor, which is located in the smoke hood, includes a bimetal plate. As traction deteriorates, flammable smoke gases accumulate and overheat the plate. The plate bends, the contacts are disconnected, and gas does not enter the combustion chamber. The flame sensor functions in a similar way.

Despite the convenience of electronics, many still choose mechanical automation for a gas boiler. There are several reasons for this:

1. Control of such automation is elementary.
2. A non-volatile system costs much less than devices that consume energy.
3. It is not afraid of power outages or power surges, which does not force you to purchase.

Manufacturers

Many companies producing automation for gas units, they also produce solid blocks, which contain all the most necessary devices:

• thermostat;
• valve;
• pressure meter;
• performance relay.

The automation design may vary depending on the manufacturing company, although the devices function by analogy. Automation from Italy SIT is reliable and simple. The most popular model is the 630 EUROSIT.

Domestic analogues can be seen under the SABC and Orion brands.

American automatic for a gas boiler Honeywell is one of the most popular.

Honeywell has been known since 1885 and given time is one of the leaders in the production of various automation systems.

servo drive

The popular Honeywell VR 400 model has two valves with a servo drive for operation with electronic boiler control units or remote controllers. The device has the following characteristics:

• smooth ignition function;
• work on the principle of modulation;
• built-in strainer;
• maintaining the burner mode “low flame”;
• reserve outputs for connecting minimum and intermediate pressure switches.

Honeywell products are high-precision, high-quality and effective, regardless of price category, which is why it is so popular in many countries. Budget automation for a gas boiler from this company costs about $50 (models Honeywell vs8620, Honeywell v5475, Honeywell v9500). Such devices include:

• standard set controllers that contribute safe work gas boiler and maintain the specified temperature of the coolant in the system;
• technical characteristics with more necessary indicators;
• mechanical knob for adjusting temperature modes.

Honeywell systems can perform the following functions:

1. Maintain the specified coolant temperature (from 40 °C to 90 °C).
2. Turn off the unit when there is no gas.
3. Turn off the boiler when the draft in the chimney pipe stops or when reverse draft appears.
4. Shut off the gas supply when the burner goes out.

Automation for Honeywell gas boilers is currently popular and is produced in large assortment, so the buyer always has a choice of controllers. The safety automation of Honeywell gas boilers has proven itself to be high-quality, accurate and efficient technology. And this applies to all models of the company, regardless of price.

Modern automation for gas heating boilers has great importance in the safe operation of a heating device, and currently it is almost impossible to do without it. Foreign automation models are highly reliable and for a long time service, this is proven by the time-tested operation of devices on different gas boilers.

The concept of automation for a gas boiler includes all control and actuating devices that ensure the operation of the unit in specified modes with minimal human intervention. Based on the principle of operation, automation equipment is divided into two groups: volatile and non-volatile.

The kit for automating the operation of a domestic boiler consists of the following elements:

1. fittings;
2. valves;
3. pressure switch;
4. thermostat;
5. sensor;
6. boiler priority relay.

In this article:

Armature

Gas fittings from Gazlux

Gas fittings are called an actuator designed to execute commands received from the boiler control system.

Valve regulators initiate the processes of stopping or starting boiler equipment and control its power.

This device ensures the safe operation of heating boilers.

The valves are installed on boilers with built-in gas burners. The valve's job is to open or close the gas supply.

Valve with piezoelectric ignition

Used in gas boilers. Such a valve is opened manually, after which the flame is ignited by a piezoelectric element. The open state of the valve is ensured by a coil connected to a thermocouple (when the burner heats up, an emf occurs in the thermocouple).

Read more about the principle of operation of a thermocouple.

Solenoid valve

KEG solenoid valve

This is a hydraulic element that regulates the flow of gas under the influence of electromagnetic forces.

The solenoid valve requires power to operate.

The core connected to the device seat opens or closes the path to the gas flow.

The valve seat, depending on the design, can have several positions in the operating cycle:

1. Single-stage: has two positions - “open” and “closed”. If current is supplied to the coil, the valve opens to the maximum; if there is no power supply, it closes.
2. Two-stage: in addition to two extreme positions, it has one intermediate position (this is the initial position for a valve of this type). In this position, partial gas flow is ensured. The maximum opening of the valve occurs after a certain period of time, when a stable flame appears on the burner. This design ensures a smooth start gas burner.
3. Three-stage: has two intermediate positions. Such valves are installed on boilers with two power levels.
4. With modulation: between the extreme positions the valve can open to an arbitrary amount in accordance with the commands of the power modulator.

Pressure switch

The pressure switch is a membrane that affects a group of contacts.

As soon as the gas pressure decreases or rises to a critical level, the membrane will move under the action of the spring and the electrical contacts will turn off. As a result of a break in the electrical control circuit of the boiler, the gas supply to the gas valve will stop and the unit will stop. When the gas pressure increases or decreases, the membrane will return to its original position, after which the boiler can be started.

Minimum pressure switch gas is used to protect the gas burner and the boiler itself.

When the pressure drops, the flame can “sag” to such an extent that metal parts of the burner end up in the torch zone. Such contact will lead to their failure.

What to do if the gas boiler constantly goes out: an overview of the reasons and.

Maximum pressure switch gas is similar to the first type, only it is triggered when the pressure increases.

The operation of this type of relay is also aimed at protecting metal parts boiler: an increase in the size of the torch can lead to burnout of the combustion chamber. In addition, excessive pressure will not allow gas valves close.

Thermostat (thermostat)

Based on their operating principle, temperature controllers are divided into volatile and non-volatile.

Volatile thermostats

There are two types:

This device works on the following principle: as soon as the room is installed set temperature, it will transmit a signal to the gas supply valve through the cable to close it.

When the room temperature drops, the device will send a corresponding command and the boiler will automatically turn on.

• programmer;

Differs from room thermostat the ability to program the operation of boiler equipment during the day. A day later, the established cycle is repeated.

There are also weekly programmers on the market; they have several programs. Some of them are configured by the manufacturer, and some by the user.

Depending on the type of connection to the boiler, programmers can be wired or wireless.

Non-volatile thermostat

Thermostat mechanical type reacts to the temperature difference of the coolant. It is a rod made of a material that is sensitive to temperature changes. Depending on the rise or fall in the temperature of the medium, it lengthens or shortens, thus regulating the gas supply.

How to fill the heating system with antifreeze.

Coolant flow sensor

Flow sensor

The sensor is used to protect boiler equipment from overheating.

There are two types of flow sensors:

1. membrane - the membrane acts on two rods, with the help of which a signal is transmitted to the valve and the board;
2. with a ferromagnetic ring - under water pressure, the ring rises inside the sensor, thereby closing the relay contacts. Thus, the signal from the relay is transmitted to the board.

Boiler priority relay

Modern models of gas boilers allow connecting the boiler control circuit. To ensure priority for DHW preparation over heating, a boiler priority relay is installed.

This device consists of several groups of contacts controlled by a coil.

The relay is used in conjunction with the boiler base, to which the entire load is connected. Without it, both loads (heating and domestic hot water) operate independently of each other. If there is a relay in the base, DHW priority is ensured.