Gas valve Seltis electric gas adjustment. Boiler gas valve - operating principle and settings. Check serviceability and correct operation

Most often, gas boilers are used to heat a private home. They are characterized by high operating efficiency, cost-effectiveness and ease of use. Comfortable operation of such a device is ensured by a variety of devices that control the operating mode. Thanks to automation, it is possible to increase operating efficiency and ensure the safety and reliability of the unit. These factors are important. Many people do not understand how to regulate and control automation. In our article we will consider the principle of operation, the security system, setting up and troubleshooting automation gas boiler.

Operating principle of gas boiler automation

Automation is a system of control and executive elements that are aimed at maintaining specified modes and promptly responding to problems in heating system. Thus, it is ensured safe use gas boilers with minimal human intervention in the processes that occur in the unit.

Equipped with electronic and mechanical automatic devices necessary to maintain safe operation.

Automation can be divided into two types:

Autonomous, which depend on power supply;
Adapted ones that operate without an external source of electricity.

Let's look at each type in more detail.

Operation of volatile devices

The operation of volatile automation is completely dependent on the supply of electricity. Such a device controls the supply of fuel and the degree of its heating by opening and closing the tap, thus saving costs on the heating system. The electronic system operates on the basis of information that comes from sensors to the control unit.

After processing the data on the microprocessor and controller, the commands are sent to the boiler drives.

Automation performs the following tasks:

Switching on the device in automatic mode.
Opening or closing the gas supply system valve.
Regulating the burner flame level using a temperature sensor.
Installed or emergency shutdown of the gas boiler.
Display of water heating level, air temperature, etc. on the screen.

In addition to the above functions, modern automation can perform many other tasks. For example, protecting the system from a malfunction of a three-way valve, monitoring and controlling the operation of the boiler, self-diagnosis, identifying failures in the operation of components and protecting the boiler from freezing. Automation helps to identify a malfunction before it leads to a breakdown of the gas boiler.

Automation can work accurately only if the following conditions are met:

Compliance with the required temperature conditions;
No network surges;
No problems associated with for a long time services.

If you do not follow these rules, the automation will quickly fail.

The following devices can be classified as automation:

Thermostat for controlling the temperature in the room. Such a device is installed indoors, but is connected to a gas boiler located in this or another room. The thermostat controls the temperature in the room and also regulates the operation heating equipment. When the temperature decreases, the device sends a signal to the gas boiler, which automatically starts operating.

The temperature sensor located in the room can be connected to a separate control unit. Then the temperature in the room will be maintained automatically. After the room reaches the required temperature, the valve closes and the boiler stops operating. Thus, gas savings occur.

Daily programmer. The device regulates the operation of a gas boiler, but has greater capabilities than the previous device. You can set the boiler to operate for 24 hours using the daily programmer. IN certain time You can set different heating temperatures throughout the day. Most devices automatically repeat the cycle, so changing the data requires changing the program. You can connect the daily programmer via a radio channel or cable.

Weekly programmer. Using such a device, you can schedule the operation of a gas boiler for a week in advance. You can use any mode or create your own.

For example, the Auraton-2025 programmer is equipped with 3 factory and 7 user modes that help you configure comfortable temperature in room. The display is turned off at night using a light sensor. The display shows all operating data. The operating radius of the programmer is 30 meters, so it can be placed in any room.

Operation of non-volatile automation

Some boiler elements that are necessary for control do not require the use of electricity. These devices must be adjusted manually and under the influence of geometric changes that occur under the influence of heat in the mechanisms.

To turn on the boiler, you need to press the valve with a washer. The latter will be forced to open, letting in fuel that goes to the igniter. There are many electronically controlled models on the market, but mechanical ones are popular. There are several reasons for this:

Low cost.
Ease of use.
Reliability. Such devices do not depend on power surges or power outages, so they can operate without a stabilizer, which is needed when working with volatile equipment.

Disadvantages of this type:

Low adjustment accuracy.
It is necessary to monitor the operation of the boiler.
Manual setting.

The device has a temperature scale, where the numbers indicate the minimum and maximum values. In order to install operating temperature, you need to set a mark on the gradation ruler.

After the boiler starts working, the thermostat is responsible for its functioning. When cooling, the rod of the device opens the gas supply valve and thus, due to the increase in temperature, increases in size and then shuts off the gas supply. This process helps to increase or decrease the heating temperature.

Safety system

The security system of a gas boiler includes many elements that can be divided into 2 groups:

Devices that contribute to comfortable operation of the boiler;
Devices that are responsible for the safety of equipment.

The second includes a thermostat, safety valve, as well as a flame and draft control sensor.

The flame control sensor consists of the following elements: an electromagnetic valve that turns the gas supply on and off and a thermocouple. The thermostat maintains the desired temperature of the coolant and protects against overheating. When the coolant reaches a critical point, the module turns the boiler on or off.

As the temperature rises, the location of the bimetallic plate changes, it bends and blocks the pipe through which the gas flows. Thus, the draft control device turns off the fuel supply to the burner.

The safety valve regulates, distributes and shuts off the gas flow. In a heating system, such a device is an inextricable element. pipeline fittings, which has great importance in controlling the volume of coolant.

Fuel moves through an opening in the valve called the seat. In order to turn off the equipment, it must be closed with a piston.

Gas valves come in single-stage, two-stage, three-stage and simulating types.

The first type has 2 operating positions: on and off.

Two-stage has 1 input and 2 outputs. The valve opens after turning to the intermediate position, so activation occurs smoothly.

Three-stage is used for gas boilers with two power levels.

The latter are used to smoothly change the boiler power value.

Automation is used for safety and convenience. The user does not need to perform many tasks independently. This includes selecting a comfortable operating mode, diagnostics, auto-ignition of the burner, etc.

How does the autoblock work?

Manufacturers produce control units that include all of the above devices. Even if they look different, their operating principle still remains the same.

Automation is very popular Italian manufacturer EuroSIT. You can note the 630 brand, which has many functions, reliability and long term services. Let us consider the design of an automatic block of this model.

The automatic unit EuroSIT 630 consists of the following elements:

A casing, which consists of a pressure regulator module, a spring valve and a shut-off valve. Thanks to this, its design is simplified.
Gas is supplied through a pipe connected to the housing.
Cables from sensors and other elements are connected to the housing.

Setting up heating boiler automation

Regulation involves setting up automation that supports the desired temperature regime, located in the liquid circuit, and in an emergency it blocks the gas supply.

Before proceeding to setting up the automation, it is necessary to install the equipment in accordance with the drawing. You also need to check the complete set of device elements, which must match those stated in the instructions. You can adjust it automatically using a knob. It helps to move the boiler to 3 positions: switching on, ignition and setting the temperature (1-7). In order to turn on the igniter, you need to move the handle to the second position, setting it opposite the spark icon. The pilot burner is ignited using piezo ignition. The lever should be held in one position for 30 seconds. After you release the button, the igniter should stop working. The thermocouple begins to heat up when the flame is ignited, so an EMF of 25 mV begins to be generated in it. Consequently, a chain is formed, the links in which are solenoid valve and sensor.

To open the solenoid valve, you need to press the lever, gas will be supplied to the igniter. The thermocouple provides protection against backfire. The sensors in the operating position, which belong to the circuit elements, are closed. Once the signal is received, they open and the equipment turns off.

Problems when turning on the ignition element

If you have problems turning on the device, you should use the instructions. First of all, you need to buy a screwdriver and open-end wrench, pliers, multimeter and alcohol for cleaning parts.

It is necessary to remove the terminals of the device. They are locked together and then tightened with pliers.
In order to find out the cause of the breakdown, turn on the igniter. If ignition occurs normally, then the fault is probably in the draft sensor. You need to unscrew this element.
It is necessary to inspect the contacts, which must be fixed to the housing and have no traces of oxidation.
When open, the temperature should be 75 degrees.
The resistance should be 1-2 ohms. You can measure it with a tester. If a malfunction is found, this element must be replaced.
During normal operation of the part, it should be wiped with alcohol and reverse installation device.
In order to check the traction breaker for a thermocouple, you need to remove the terminals and check the resistance, which should have an indicator of 3. If the value does not correspond to the required value, then you need to unscrew the nut with a No. 9 wrench, which secures the thermocouple to the traction breaker, then unscrew the latter half a turn with a No. 12 wrench. Next, you should take out the plastic insert with contacts and unscrew the part completely.
To check the thermocouple, the solenoid valve is connected and secured with key No. 9. If after checking the ignition does not occur, then this part is faulty. The nut that secures the thermocouple to the igniter must be unscrewed with a No. 10 wrench, then the part is installed in the required position.
In order to evaluate the result, the EMF is measured (optimal value 18 mV), after which the thermocouple contacts and the traction breaker elements are cleaned with alcohol. The last step is assembling the device.

Troubleshooting problems with automation

Most often, ignition does not occur due to contamination of the insulator along which the wire leading into the combustion chamber is arranged. This problem can be resolved by wiping the element with a soft cloth. If the part is heavily soiled, it can be wiped with solvent and wiped dry.

Another reason may be soot deposits that form in the combustion chamber. Tapping on the tube that leads the gas to the burner can solve this problem. If the device has not been used for a long time, it is necessary to check the condition of the pipes.

IN modern boilers Malfunctions are indicated on the displays in the form of codes. If the water does not heat up well, this may be due to deposits on the walls of the heat exchanger. To eliminate the problem, you can flush the circuit hot water with addition minerals. If this method does not help, then it is better to contact specialists. Poor heating may be caused by a malfunction of the electronics or flow sensor.

TO gas boilers high power, a “clocking” effect may occur, which appears due to frequent switching on. The equipment often turns on due to the strong heating of the gas. To eliminate the problem, you need to reduce the fuel consumption that goes to the burners. In the electronic model, you can set the desired mode on the display, and in the mechanical model, by rotating the adjustment lever on the gas valve. To increase the service life of a gas boiler, you should carry out preventive examination during.

(performed if the measured pressure does not correspond to the table value or when switching to another type of gas)

Gas valve SIGMA setting

Turn off the boiler using the button on the boiler control panel.
Unscrew the plug screw at fitting “A” for measuring the outlet pressure of the gas valve by 1 – 1.5 turns.
Attach the pressure gauge to fitting “A”.
Remove the protective cap from the valve modulation coil adjusters.
Turn on the boiler in the “Chimney Sweep” mode.
After the pressure has stabilized (burner power indication = 100%), take a measurement and, if necessary, turn the nut “C” to adjust the maximum gas pressure (see the table supplied with the boiler).
Remove one of the terminals “E” of the modulation coil, take measurements and, if necessary, turn screw “D” to adjust the minimum gas pressure (see table).
Reinstall the modulation coil terminal and check the maximum gas pressure value.
Turn off the boiler.
Disconnect the pressure gauge from fitting “A”.
Tighten the plug screw of fitting “A”.

Install and seal the protective cap.

Note: when rotating nut “C”, hold the screw

Resistance of the windings of the gas valve SIT 845 Sigma

Professional tuning of a gas boiler begins even before purchase. First, its power required for high-quality heating of the house is determined. Below are instructions that will help you correctly set up the unit yourself, and also describe the features of setting up the draft regulator of a solid fuel unit and other components of the heating system.

Setting up a gas boiler yourself

The minimum power is calculated by calculating the heat loss per unit time. Heat escapes through window designs, walls and ceilings, as well as doors and ventilation system. Losses are also caused by the difference between temperature levels inside and outside the room. If the house is insulated according to modern energy saving criteria, then the formula is: 1 m 2 = 100 W.

Most modern boilers can set the maximum power of heating and DHW separately: the heating level is reduced, and in DHW mode the boiler produces the highest power. Such control is mainly found in service menu. It is performed by specialists. The maximum and minimum gas pressure is regulated using a similar principle. It creates limits for power and heating, as well as domestic hot water. This setting is also performed only by specialists. You can monitor gas leaks by monitoring the burner flame.

Video: how to set up an Electrolux gas boiler

Temperature control

First of all, buy a boiler with a thermostat. Here, the burner power must be controlled so that the water temperature remains stable. This thermostat is combined with a room temperature sensor. A sensor for a comfortable temperature that suits all residents of the house.

Thermostat for gas boiler

Today's thermostats are able to sense the difference between indoor and outdoor temperatures. For these purposes, two sensors are installed: internal and external. Only such control does not control the temperature in each room separately.

This can be corrected by installing special valves in front of all batteries in the supply pipe. In this case, the coolant in the boiler should have a parameter of no more than 55 o C. And the lower it is, the more efficient the gas boiler will be.

How to calculate the efficiency of a gas heating boiler

The calculation method is as follows: compared thermal energy, used to heat the coolant, and the actual volume of all heat generated by gas combustion. The formula works in production conditions

η = (Q1/ Qri) 100%

Here Qri is the total volume of thermal energy generated by gas combustion.

Q1 - heat accumulated and used for heating the room.

This formula does not take into account potential heat losses, deviations in system performance and other factors. Using calculations, the average efficiency of a gas boiler is obtained. Many manufacturers indicate exactly this data.

Typically, the error in calculating thermal efficiency is assessed on site. This is the formula that works here:

η=100 - (q2 + q3 + q4 + q5 + q6)

q2 - heat losses in combustion results and exhaust gases.

q3 - losses due to incorrect proportions of the gas-air composition, in turn, they cause underburning of the gas.

q4 - losses due to soot formation on the heat exchanger and burners.

q5 - losses due to external temperature.

q6 - losses due to cooling of the combustion chamber when it is cleaned of slag.

The real efficiency of the boiler is calculated only on site. It is also influenced by how professionally the chimney was created and the installation of the boiler was carried out.

The q2 component has a huge impact on efficiency. When the flue gas heating activity decreases by 10–15 C, efficiency develops by 1–2%.

Ways to increase efficiency

Methods for developing boiler efficiency are associated with competent maintenance and timely elimination of problems and contamination:

There is physical underburning. The solution is to maintain the cleanliness and normal condition of the fire tubes and water circuit (if the boiler is double-circuit). Soot must be removed from pipes in a timely manner, and scale must be removed from the circuit.
Excess air has accumulated in the boiler. Solution - a draft limiter is mounted on the chimney pipe.
You need to adjust the blower damper. A thermometer helps here. The damper is fixed in such a position that the coolant reaches its maximum temperature.
Maintaining normal traction. It decreases when the cross-section of the chimney narrows. Therefore, regularly clean the exhaust pipe from soot and the combustion compartment from soot. This way you will also reduce gas consumption.

These methods are applicable to all modifications of gas boilers:

wall;
floor;
Double-circuit;
old.

In old boilers, increasing efficiency is somewhat dangerous, because the device may no longer withstand optimal performance. But if you still set this goal, then:

it is possible to increase the dynamics of water circulation in this system. You need to install a special pump - a circular one;
use special materials and thermal protection.

How to fix an igniter

Igniter for automation

It may not turn on because the insulator is dirty. Through the isolator high voltage wire goes through the body into the combustion compartment. The solution is to wipe the insulator. Need a rag. If the contamination is severe, use a solvent to eliminate it.

Soot may accumulate in the combustion chamber. It prevents a spark from occurring. The solution is to lightly tap the line that carries the gas to the burner.

If the ash pan turns on, but gas does not flow to the main burner, then the following may be to blame:

thermocouple;
supply valve;
thermostat;
solenoid valve.

Diagnostics of these parts requires practical skills and implementation of automation into the unit.

And also in the contact area of the main pipe to the main burner there may be a spider cocoon. The solution is to unscrew the nut and remove this cocoon.

Working with the DHW circuit

Heat exchanger housing

If the water in this circuit does not heat well, then the walls of the heat exchanger are covered with deposits. Solution - the circuit is washed with hot water, which contains elements to dissolve these deposits. When a similar problem occurs in devices with an electronic system, it may be a manifestation of problems in the electronics or duct parts. Only specialists can fix this.

Clock problems

When a very powerful boiler is in operation, “clocking” may begin. At the same time, the coolant heats up very intensely, and gas consumption increases, and the automation often works. As a result, the boiler quickly fails. The solution is the following: the gas supply to the burner is reduced. After carefully studying the instructions, you need to find the gas valve, the setting method and reduce this flow.

Example of a new gas valve

Most often it is necessary to rotate the adjusting screws on the gas valve. In some modern models The gas supply can only be adjusted in the control panel. The instructions for them usually indicate plans for this setup.

The nuances of working with electronics

Modern boilers, classified as high-tech, are equipped with sophisticated electronics. Data about the current conditions of the device and its emerging problems are reflected on the display: an error code is displayed. For example, the reliable Junkers model. Its shortcomings are displayed by the diagnostic system on the display: a code is displayed. The most common problem here occurs with the control board.

Such systems are repaired only in special workshops high level. Therefore, you should not purchase a high-tech modification if there is no such workshop nearby. If such a purchase does take place, it is necessary to set special devices: stabilizers or UPS.

Example of mounting a stabilizer for a gas boiler

Methods for regulating burner power

The useful thermal power is reduced by reducing the gas supply to the burner. To do this, you need to adjust the gas valve.

Gas valve clearly

A connector with yellow wires, mounted in a stepper electric motor. And in modern devices, as a rule, the gas valve is adjusted using the specified engine. It is controlled from the device control panel through the service menu.

Checking and adjusting traction

As already mentioned, the presence of normal draft develops the efficiency of the boiler. Traction must be checked and adjusted regularly. The methods are:

Working with an anemometer. Thanks to this device, the dynamics of gas movement is calculated. Modern devices can accurately identify the thrust parameter and make a verdict on the reasonableness of starting the equipment. However, the prices of this device are quite high.
Work according to the “old-fashioned” method. Take a sheet toilet paper, you can take other paper. The main thing is that it is light. Bring this sheet to the chimney. It will reveal whether there is craving and how active it is. If the sheet deviates strongly under the influence of the wind, then the draft is good.
Detection of mechanical contamination. The most common reason dilemmas with draft - blockage in pipes. You can determine the presence and degree of blockage like this: lower the metal ball on a rope or fishing line. The starting point is the top point of the chimney. The end point is its lowest point. If the ball easily reaches the specified point, then the chimney is clean. And if smoke removal is still problematic, it means that difficulties have arisen in another area. The channel may not be long or wide enough to work effectively.

You can also detect a blockage visually if the design of the chimney allows this.

Methods for developing traction:

Structural defects, for example, a weak pipe diameter or many bends in the channel, can only be eliminated by repositioning the pipe. In other cases, simpler methods work.
If the pipe is not high enough, it needs to be increased. If you are working with brick, do additional masonry. Mounted on a metal pipe additional element. He brings designs to required height- 5 m. Calculation from the firebox.
If the channel has narrowed due to the abundance of soot, cleaning is done using a brush and a weight on a rope. This device is lowered into the pipe. And with progressive maneuvers the passage is cleared.
If the tightness of a brick chimney has weakened, it is strengthened using a special solution. They cover up the cracks. In more complex situations, part of the pipe is re-laid.
If the channel dimensions are sufficient, sleeves should be used. This operation requires ceramic or metal pipe. The chimney becomes sealed. Efficiency is developing round section channel. Gases are removed without problems.

If you urgently need to develop traction, but the weather is not pleasant, there are the following ways to do this:

At sub-zero temperatures, cold air forms pressure. It interferes with the outgoing flow. To warm up the pipe, you can burn a small amount of paper in it. You also need to insulate the pipe well.
When it's stormy outside strong wind, the deflector will help develop traction. It is mounted on a pipe. And when there is exposure to wind, low pressure is obtained in the deflector. It develops traction. Its diameter is determined by the dimensions of the chimney. When there is no wind, the device is not conducive to increasing traction. For its production it is used stainless steel. Therefore, the deflector is resistant to high temperatures and humidity.
A similar effect is obtained from a rotary turbine. She is placed on the head. Under the influence of the wind, it rotates, so the air moves in the smoke channel. A ball design with blades protects this channel from various items and precipitation. The turbine is mounted for a model with a modest temperature of the exhaust gases.
Protection is created for the mouth of the pipe - this is the installation of a weather vane. The weather vane is positioned so that the smoke rises from the leeward side, and the surrounding air develops draft. With this device, the possibility of draft failure in the chimney is reduced. Its moving element must be lubricated frequently so that it is not destroyed by corrosion. The weather vane also needs periodic cleaning of soot.

Reduced gas consumption

As already mentioned, these costs are lower when your home is thoroughly insulated. It is also important to properly regulate the temperature in the room.

A good option for achieving the given goals is associated with a slight decrease in temperature. For example, residents feel comfortable even at plus 20 o C. So why then drive the device to 25 o C or higher. This wastes more energy.

Reduce gas flow possible by installing special temperature regulators. They are able to configure how to turn the device on and off. They are very convenient because they allow you to adjust the temperature in the room even when you are away. The device will work to maintain the value you previously set.

How to set up a draft regulator and other components for solid fuel boilers

Solid fuel boiler in schematic form

These methods help to adjust the temperature and thrust of the device. They are:

The unit heats up to +80°C.
Using the setting handle, the temperature is set on the draft controller, which is reflected on the boiler thermometer.
A chain is tightened on the air damper. The damper must be in such a position that the boiler can reach desired temperature. Under these conditions, the void between the damper and the housing varied in the range of 2–50 mm.
The traction controller is checked using other temperature data: the parameter is set to 90°C in the settings. We need to figure out how the controller will support this parameter. When the parameter reaches 95°C at the boiler outlet, the controller should close the gap damper 2–5 mm. If the boiler has a limit screw, it will prevent the damper from closing. Use it to adjust the gap.
Action for a boiler with two circuits. Having calibrated the traction controller, set the desired temperature parameters at the outlet of the device, within 85°C.

Video: installation and configuration of automation for a solid fuel boiler

Development of the efficiency of such a boiler

The efficiency of this boiler is mainly determined by the type of fuel and its design specifics.

For example, when coal, wood or pallets are burned, a lot of thermal energy is generated. Efficiency also has a huge impact on technological method fuel combustion in the corresponding compartment, and the type of heating system.

When burning anthracite, coal and peat briquettes, the average efficiency is 70–80%. When burning pallets - up to 85%. When burning granules, it is noted high efficiency work and an incredible amount of thermal energy.

If your boiler is solid fuel Over time, efficiency needs to develop; you can study the instructions for understanding. Typically, manufacturers indicate ordinary methods. But over time they work extremely poorly. And today this method of increasing the efficiency of solid fuel boilers has gained great fame: another heat exchanger is installed. It must remove thermal energy from volatile combustion products.

Before installation, be sure to find out the temperature data of the smoke at the outlet. To do this, use a multimeter. His position is in the middle of the chimney. Information about the potential volume of heat that can be obtained will help calculate the area of \u200b\u200bthe additional heat exchanger.

The further algorithm of operations is as follows:

Loads into the combustion chamber a certain amount of firewood
Determine how long this particular amount of fuel will burn.

Example: 14.2 kg of firewood loaded. Their burning time is 3.5 hours. The smoke output parameter is 46 0 C.

4.05 kg of wood burned in an hour. This is the result of this calculation: 14.2: 3.5.

To calculate the volume of smoke, operate general meaning- 1 kg of firewood is equivalent to 5.7 kg of smoke gases. Then the previous result of 4.05 is multiplied by 5.7. It turns out 23.08. This is the mass of volatile combustion products. Based on this value for others, calculate the amount of thermal energy that will be useful for heating the new, connected heat exchanger.

Knowing the heat capacity parameter of volatile heated gases (this is 1.1 kJ/kg), it is possible to calculate the power of the heat flow. This is necessary when the smoke parameter is reduced to 160 0 C (from 460 0 C).

The following formula works here

Q = 23.08 x 1.1 (460–160) = 8124 kJ.

This shows the exact additional power parameter. It is created by combustion products. It turns out like this: q = 8124/3600 = 2.25 kW. This is a decent indicator. It can dramatically improve the efficiency of your boiler.

Knowing how much energy is wasted, implementing a second heat exchanger makes perfect sense. New thermal energy is created. Both the efficiency of the boiler and the entire heating system increases.

Video: more about efficiency for a solid fuel boiler

Setting up and increasing the efficiency of any autonomous device is not always a difficult, but very important undertaking. Where there should be no hint of doubt. Therefore, if difficulties arise during the process of modification or even repair, it is advisable to obtain advice from a specialist in this class of equipment.

If earlier the boiler adjustment was simple - turn the valve on the burner and increase or decrease the gas pressure, then modern automation does everything itself. But there are also problems with it that require adjustment of the automation. Let's look at how a modern gas boiler functions.

Description and functions of a gas boiler

A simple heater consists of a heat exchanger chamber, a gas burner and ventilation. The operation of all these systems is controlled by automation.

The safety device for gas boilers has a multi-stage protection system:

When igniting, you need not only to turn the gas supply handle, but also to hold it for some time until the solenoid valve (6) is activated. This prevents the device from accidentally leaking gas.
The backdraft sensor (8) reacts to the flow of fire from the burner into the room. This can happen due to sudden gusts of wind, a clogged chimney, or malfunctioning burners. Thanks to this controller, the gas supply is automatically turned off when backdraft occurs and people cannot be poisoned by carbon monoxide.
The temperature sensor (7) protects the boiler from overheating, turning on the gas as needed. Thanks to it, the temperature in the heating system is maintained at the level specified by the user.

Control systems in gas boilers can be autonomous or energy-dependent. The latter require connection to the electrical network.

Gas boiler adjustment

If the automation begins to work incorrectly, or there are malfunctions in its functioning, then you need to find the reason and either adjust the control system or replace the faulty elements.

IMPORTANT! Do not ignore malfunctions, even if they occur only occasionally. This could cost you and your loved ones your life.

Let's look at the most popular problems that you can fix yourself:

“The boiler heated wonderfully in the fall, but in the winter the house was cold.” This is, in fact, not a breakdown, but just a need to regulate the heating temperature. There is a thermostat in the body of any gas boiler. It may look like a rotating handle with a scale, buttons with a temperature screen, or a scale with a slider on it. It is enough to set a higher heating value, and your home will immediately become warmer.
“When igniting, the solenoid valve does not work, no matter how much you press on the handle.” The most common failure requiring valve replacement.
“The boiler burns normally, but after a while there is a bang and everything shuts down.” As a rule, here we are dealing with automatic activation. But what is the reason for the “pop” will have to be clarified. It is best to invite specialists.

IMPORTANT! Do not glue or jam a faulty EM valve! It is responsible for the gas supply, and if it is fixed, the rest of the automation will be useless. When the burner goes out or reverse thrust, You risk simply suffocating.

Conclusion

In conclusion, it should be recalled that all gas equipment- source increased danger. You should not unwind anything in the boiler control system yourself or interfere with the operation of controllers, burners and sensors. Gas is invisible and undetectable, and its leak is much more difficult to detect than faulty wiring or leaking water pipes. If it is necessary to install, replace, repair or adjust a gas boiler, it is better to invite specialists.

The gas valve is necessary to supply gas to the burner device of the unit. By adjusting the gas valve, you can regulate the amount of fuel supplied. This makes it possible to make the unit more economical or increase the power of the device. Thus, the user, depending on the situation, has the opportunity to adjust the performance of his unit.

Most gas units have a SIT valve. It includes the following elements:

gas pressure measuring port at the valve outlet;
adjusting screw for minimum and adjusting nut for maximum fuel consumption;
lid;
inlet pressure measuring port.

The gas boiler valve consists of a shut-off and modulation coil. When a voltage of 220 V is applied to the shut-off valve, a minimum volume of gas is supplied to the burner in accordance with the factory settings. The voltage is then transferred to the modulation coil. The processor, depending on the operating mode (power), supplies voltage with different modulation frequencies, regulating the amount of gas passing per unit time.

To set the boiler gas valve to minimum power, you will need a differential pressure gauge, a wrench and a screwdriver. The setup process includes the following steps:

Remove the protective cap covering the differential valve screws.
Open the fitting to measure the gas pressure supplied to the burner - turn the locking screw 1.5-2 turns counterclockwise.
Connect the pressure gauge hose to the inlet fitting.
Turn on the heating mode and disconnect one wire of the modulation coil - this is necessary so that the valve supplies gas to the burner to a minimum, which will correspond to the minimum power of the unit.
According to the pressure gauge readings, set the minimum gas pressure on the burner. To do this, rotate the internal screw located under the protective cap. At the same time, fix the outer nut.

The dynamic fuel pressure at the gas valve inlet ranges from 1.4 to 2.4 kPa. If measurements show that the pressure is outside the specified limits, it is necessary to call gas specialists.

In the factory power range, there is no need to manually reset the gas valve. This is required in order to transfer the unit to a power lower or higher than the values stated in the instructions. Often, valve adjustment is needed if the performance of the device does not correspond to the heated area of the house or apartment.

Setting the gas valve when the boiler is “clocked”

A problem such as “clocking” of a gas boiler can be solved by adjusting the gas valve. It usually occurs if the power of the unit significantly exceeds that required for a given area.

To prevent the device from “clocking” in heating mode, it is necessary to reduce the outlet pressure. This is done by rotating adjusting screw counterclock-wise.

To stop “clocking” in DHW mode, reduce the maximum pressure. This can be solved by rotating the adjusting nut counterclockwise.

However, in more modern models, “clocking” is eliminated automatically. For example, setting the gas valve of the Buderus boiler is done by blocking the cycles:

hold the button with wrench for 5 seconds;
select the duration of intervals from 0 to 15 minutes using the arrow buttons.

It is recommended that these types of adjustments be carried out only by specialists service center, especially if the boiler is under warranty. Otherwise, if you damage the valve, the company will void the warranty and you will have to buy a new part.