Draught regulator for solid fuel boilers setting

Draught regulators for boilers

Thus, the lack of a device for automatic regulation of coolant heating makes operation of the boiler unit unsafe. the person in charge of the boiler requires constant attention to the regime of the equipment

The draught regulator has other functions besides protecting the coolant from boiling:

  • the device helps to maintain a certain temperature of water heating in the heating system depending on the need for heat (in frosty weather heating to maximum temperatures is necessary, in the off-season and during thaw periods the degree of heating of the coolant is reduced);
  • By changing the intensity of air supply it is possible to increase the combustion time of one fuel charge (but the combustion conditions are far from optimum and the boiler efficiency decreases).

To avoid boiling of the coolant, instead of the regulator the safety valve can be installed on the solid fuel boiler. It will automatically relieve the pressure if it exceeds the set value. However, the valve is designed for one-time emergencies. it will fail if the heat generator is regularly heated to critical temperatures. In addition, without a draught regulator to adjust the heating fluid manually.

Design and principle of operation

The scheme of the device is quite simple. The main structural elements are:

  • temperature control knob;
  • the rod and the guide;
  • actuation mechanism;
  • immersion sleeve;
  • temperature sensing element;
  • spring;
  • actuating lever;
  • fixing screws of the handle and the lever;
  • chain.

Main component. sensor that reacts to temperature fluctuations. It interacts with a spring, which, when heated or cooled, activates the working part (sleeve and rod).

The latter, in its turn, is connected through a mechanical drive to the fuel flap. The draught regulator for solid fuel boilers under certain conditions opens and closes the door, maintaining a predetermined temperature.

The principle of operation of the device is trivial, but still effective. When the damper opens, more air enters the furnace. Due to this, the fuel burns more intensively, more heat is released and the room is heated more effectively. When the flap closes, the fuel is less supplied with oxygen and barely smolders.

If we briefly describe the operation of the draught regulator, based on the design features, we get the following scheme:

  • the thermostatic sensor responds to a decrease in thermal load
  • the sensor increases the spring tension;
  • The spring raises the lever;
  • The damper opens;
  • Combustion is intensified.

To reduce the intensity of the process, the steps are reversed.

there is a knob with a temperature scale on the regulator body. This is how the required minimum value is set. The temperature will rise as necessary, but will never fall below the set level.

On the regulator body there is a knob with a temperature scale, thus setting the required minimum value.

How to put and adjust the regulator

In most cases, the installation of thermostatic regulator by your own hands involves emptying the water jacket of the boiler. This will not create a big problem if the strapping of the solid fuel boiler is done correctly and the water heating system can be cut off by the taps. Otherwise you will have to drain the entire coolant. After this the plug is removed from the sleeve, the device is screwed in its place and the system is refilled with water.

To perform the draught regulator adjustment you should fire up the boiler and follow the instructions:

Attention! Care must be taken to ensure that the free movement of the chain does not exceed 1 mm.

Next, you should check the operation of the thermostat on all modes, up to the maximum. Keep in mind that some time elapses between the moment the flap is closed and the temperature of the thermal fluid dropping, and do not hurry to readjust the device. It is characteristic to the solid fuel heaters with the lag, because the wood or coal in the fuel box can not go out at once.

How to adjust the capacity of the gas boiler?

The power of the unit can be adjusted in two ways:

  • Installation of the boiler on solid fuel. analysis of the nuances of installation
  • To reduce the output of the burner to the level at which the automation will be able to find the optimal mode of operation.
  • Increase the capacity of the heating system by adding radiators or replacing them with more powerful ones.

In some cases it is advisable to apply two methods at once. Of course, the second option is more expensive, but often you have to choose it. It is especially relevant if the heat produced by the installed system is insufficient.

Please note! When replacing the heating, you should take into account how much volume the expansion tank of the gas boiler model is designed for. For example, the tank of the unit Gepard provides the volume of coolant 50 liters. If the amount of water increases when installing new radiators, you will need to connect an external expansion tank.

Decrease the output of the burner device by reducing the fuel supply to the burner. This requires changing the settings of the gas valve. Burner output of this element can be adjusted by turning the adjustment screws located on the valve body.

Also the power of the device can be reduced by changing the settings in the service menu. For normal users in Protherm boilers there is a general menu, which is described in the manual. But there is also a hidden service menu, reserved for service technicians. It is accessible only by entering the code. That is why it can be used only by the service center technician.

These parameters can be reconfigured in the service menu:

  • Output in the range from 9 to 23 kW
  • Circulation pump run-down time in heating mode. between 2 and 60 min;
  • time delay after operation in heating mode for anti-cycling. protects against frequent switching on and off (does not work in DHW mode);
  • The temperature of the heating medium. from 20 to 80ºC.

For a heating system with a capacity of 4 kW is set:

Here are approximate settings, but it is necessary to achieve that the burner is lit no more often than every 15 minutes. For this purpose the optimum temperature of the heating medium is selected.

However, not all brands of gas boilers have the ability to adjust the anti-cycling time. In this case, you need only adjust the capacity of the unit. On some boilers, you can manually set the operation of the pump, using the switch located on it. You need to increase the speed of the pump to reduce the frequency of cycling.

Thus, in various ways to achieve a balance between the heating system and the gas boiler.

draught, regulator, solid, fuel

Can’t find the instructions? The recommendations in this brochure do not help you? You have the opportunity to read our article on boiler adjustment. If you do not know how to handle the gas equipment, you need a master. But you must agree that it does not hurt to save time and money over and over again due to the knowledge of the basic settings. Efficient adjustment of the gas boiler is much easier than it may seem.

From the article you will understand the principles of regulating pressure, draught and power during operation of the device. Learn the likely causes of problems along with options for fixing them. If you have to tune the boiler, use our materials. Do not forget about the rules of safety, and you will successfully configure the device, fix minor problems.

The settings of the gas boiler should be of interest long before the purchase, taking into account the needs and different peculiarities. We have written which parameters can or should be changed on the device in use. A new device should be adjusted and prepared for operation, and some undesirable points can be corrected.

Adjusting the draught regulator

In general, with the help of the manual, which is included with the device, you can easily understand the settings of the design. However, in case of its loss, a step-by-step list of moves is provided:

  • First of all it is necessary to fire up the boiler. Then open the door, but most importantly, do not connect the chain to it. This is to allow the air masses to pass through.
  • Then loosen the screw that fixes the position on the adjusting mechanism.
  • After which you can set a certain temperature by scrolling the knob.
  • When the value is reached, it is desirable to attach the actuator to the flap. It must be slightly open.
  • Finish by fixing the screw.

The most important thing is to periodically watch the thermometer and do not rush to change the settings

It is also important to keep the chain spacing of less than 1 millimeter. Some models of the device is characterized by a kind of lag, because the coolant is unable to lightning speed extinguish

How to install the draught regulator on a solid fuel boiler

It is better to leave the connection of automation for the blower fan and the electric chain drive to professionals.

The mechanical thermostat has a simpler design. Therefore, the unit can be installed and adjusted by yourself. This is done in the following way:

draught, regulator, solid, fuel

HAPAI Solid Fuel Gravity Circuit Seminar

    In all modern models of boilers, there is a special installation opening for the thermoregulator.

How to check the draught in the boiler

Several factors influence the draught characteristics: flue gas temperature, chimney cross-section and weather conditions. You can check the presence of draught in a simple way:

    Open the butterfly valve and the combustion chamber door.

As a rule, during the boiler operation, if there is good draught, the smoke does not enter the room. Insufficient draught characteristics are reflected in the way the fuel glows and in the intensity of combustion.

Increase the draught and combustion of the boiler, you can perform through the fan. Most manufacturers complete their automatics with a chimney and a blower.

Hargassner Heating Technology. Wood log Boilers

How to adjust the thermostat on the TT boiler

Adjustment of the draft sensor can easily be done by yourself:

    Set the temperature at the thermoregulator to 60 ° C. Coolant in the boiler, bring to the same temperature of heating.

To check the settings and make a correction on the regulator, set the temperature to 80°C. When the heating medium reaches this value, the flap should close. If not, shorten chain length.

Setting error of the mechanical thermostat is 5 ° C. Electronic automatics works more accurately, the inaccuracy is 1 ° C.

Improvement of the regulator of an old design, allowed to automate the operation of solid fuel boiler and prevent boiling of the coolant.


Solid fuel boilers. Unlike devices using other types of fuel are more difficult to control, since they have a high inertia. This can result in excessive heat generation. To adjust the intensity of combustion, use a draught regulator. In this article, a master plumber will explain how a draught regulator for a solid fuel boiler is arranged.

The thermostatic element plays the main role in the regulator structure, placed inside the cylindrical body and connected mechanically to the lever and chain, attached to the ash-pan door. The element is a sealed bulb filled with thermosensitive liquid, which expands significantly when heated. It is located at the end of the body, which is screwed into the water jacket of the boiler and directly in contact with the coolant. How the chain-driven thermostat is arranged is shown in the diagram:

The operating principle of the automatic draught regulator is based on controlling the air flow into the fuel reservoir by the draught of the chimney. The algorithm looks like this:

  • As solid fuel burns and the heat transfer fluid inside the element expands and acts on the actuator and lever, overcoming the elastic force of the spring.
  • The lever loosens the chain, the damper starts to close and reduces the flow cross-section. Less air enters the furnace, the combustion process slows down.
  • The boiler water temperature drops, the fluid is compressed and the return spring forces the lever to open the flap again by a chain.
  • The cycle repeats until the wood in the firebox is burned through, then the spring opens the door as wide as possible.

The adjustment knob on the front end of the thermostat limits the movement of the lever and therefore the air damper. This is how the temperature limit of the heating medium is set.

In addition to mechanical regulators that do not depend on electricity, there is an automatic system for solid fuel boilers with a controller and a fan. air blower. The latter blows air into the furnace at the command of the electronic unit. adjusted on the basis of the signals from the temperature sensor. Similar sets of automatics are installed on all pyrolytic and pellet boilers.

Unlike any wood stove, a solid fuel hot water boiler is equipped with a water jacket and cannot be heated to too high a temperature, otherwise the water in it would simply boil over. In such cases, the resulting steam sharply increases the pressure in the system, causing an explosion. That means that the solid fuel boiler, the output of which is regulated manually by the ashtray door, is source of increased danger.

Boiler without any automation can work in conjunction with a buffer tank. heat accumulator. Whose volume is properly calculated. Excessive heat will go there if you do not close the door in time and did not limit the air flow into the furnace.

How to install the draught regulator on a solid fuel boiler

Connecting the automatics for the blast fan and chain electric actuator, it is better to trust professionals.

Mechanical thermostat has a simpler design. Therefore, the unit can be installed and adjusted by yourself. This is done in the following way:

  • In all modern models of boilers, there is a special installation opening for the thermoregulator.
  • Before installation, drain the boiler.
  • In the installation hole install the draught regulator, by means of a threaded connection. Seal the joints.
  • Pour water into the boiler, after which the fire is ignited.

How to check the draught in the TT boiler

Several factors influence the draught characteristics: flue gas temperature, chimney cross-section and weather conditions. Check the draught can be done in a simple way:

  • Open the slide gate and the furnace chamber door.
  • Light a match or a piece of paper and bring it to the furnace.
  • The fire must be drawn into the furnace.

As a rule, during the operation of the boiler, if there is a good draft, the smoke does not enter the room. Insufficient draught characteristics are reflected in the way the fuel glows, as well as in the intensity of combustion.

Increasing the draught and combustion of the boiler, can be performed by means of a fan. Most manufacturers provide the automation system with a smoke exhauster and blower.

Installation and preparation rules

The draught regulator for solid fuel boilers can be installed by yourself, if the boiler is not equipped with one. Unit needs to be set up properly.

After closing all the shut-off valves, drain the heating medium from the water jacket

Installing the regulator in most cases requires draining the water jacket. To avoid draining the water from the whole system, close the respective shutoff valves. Then remove the plug from the sleeve on the boiler body and screw in the regulator, without connecting the chain to it. Then refill the system with water.

The adjustment is performed in several steps:

  • Open the ashtray door (without attaching the chain to it).
  • Loosen the grub screw on the adjusting knob.
  • Choose a temperature mode and set the handle in the appropriate position (for example, 60 ° C).
  • Attach the chain to the lever.
  • Melt the boiler with the ash door open, wait for the heating medium to 60 degrees (watch the boiler thermometer).
  • Close the door so that it is ajar by 2mm.
  • Attach the loose end of the chain by pulling it taut (allow 1 mm of slackness).
  • Tighten the locking screw on the handle.

Note! A controller with universal settings has two scale settings, one for vertical operation and one for horizontal operation, and these are colour-coded. It is important to choose the correct scale for the setting of the device.

draught, regulator, solid, fuel

The thermostatic regulator must be tested in all temperature ranges, including the maximum setting, to ensure that it functions correctly. Solid fuel boilers have a great inertia. the change in intensity of coal or wood combustion occurs smoothly and even slower decreases or increases the heating medium. Therefore, after closing the flap, a certain amount of time elapses before the coolant in the system begins to cool. For this reason, when checking the settings of the regulator, do not rush to make adjustments.

It follows from this

Even a simple mechanical regulator can increase the convenience and safety of operation of solid fuel boiler. They are not highly accurate, but will help to maintain a comfortable temperature in the house, save fuel.

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