Gas boiler blows in the wind what to do
Often the reason for stopping the operation of a gas heating boiler is blowing wind. Turning it off in winter is a very unpleasant surprise for the owners. This can lead not only to a sharp decrease in the temperature inside the house, but also damage to the entire heating system. Let's deal with the problem.
If your gas boiler suddenly turns off, do not panic and, for the beginning, exclude such a possible reason as a sharp drop in gas pressure in the pipeline. To do this, you can simply turn on the gas stove and look at the flame, its dimensions, check how quickly the water will boil. You will immediately notice the low gas pressure on the hob. In this case, your boiler is definitely not to blame, call the gas workers and find out the causes of the problem. Most likely, it is not only you, but all neighbors.
In addition, check and eliminate the possibility of gas leaks - using a soap solution, which is applied with a sponge or spray bottle to the joints of pipes and parts. There is no smell or bubbles, so it’s not a leak.
However, the reason for the shutdown of the gas boiler is often obvious - there is a hurricane wind outside, which simply whistles in the pipes. Strong gusts of wind entering the chimney cause a back draft, the valve is triggered, and the flame in the boiler is automatically extinguished.
You should think about preventing the risk of blowing out the boiler even at the stage of installing the chimney. It is highly advisable to take into account the wind rose in your area. A chimney incorrectly positioned relative to the wind pressure zone significantly increases the risk of blowing out the boiler burner. Incorrect chimney configuration can also cause this problem.
A deflector installed on the head of the chimney copes well with the problem of blowing out the boiler. This is a fairly simple design that enhances the draft in the chimney, protects it from precipitation and blowing out. Be sure to think about installing a deflector or immediately purchase a design with such a device.
Important! Actions with gas equipment require coordination with the relevant service. Therefore, before installing a deflector or wind vane, consult with gas workers.
The cause of the blowing out of the gas boiler can also be the burning out of the metal chimney pipe. As a result of burning, a hole is formed where the air flow enters - problems with the chimney appear. Only replacing the pipe will help to cope with the situation. In the case of coaxial chimneys, there is no risk of burning out, because hot gas from the boiler goes through the inner pipe, being cooled by the oncoming cold air flow.
Two more possible reasons for blowing out a gas boiler:
Ice build-up on the chimney. This often happens with coaxial structures in a frost of -10 ..- 15 ° C. Hot steam comes out of the chimney, gradually cools down, turns into water droplets, condensate, which freezes, forming icicles and a thick layer of ice. This leads to a disruption of traction, the boiler's automation is triggered, it stops work. If such a problem arises, do not rush to shoot down the ice build-up - you can damage the chimney itself. It is best to remove the head, the upper part of the pipe and bring it into a warm room so that the ice melts naturally. Before removing and cleaning the pipe, the gas supply must be shut off! Additional insulation of the chimney helps to avoid the appearance of ice;
Poor ventilation in the boiler room can lead to problems in the operation of the atmospheric boiler.Arrangement of forced ventilation in the room or openings with a fine mesh in the lower part of the boiler room door will help.
They help to cope with the blowing of the boiler by manipulating the pipe - the diameter of its outlet can be reduced or increased in length. A too large chimney opening can be reduced by installing an additional inner pipe. Remember that the vertical chimney must be 50 cm higher than the roof ridge.
At the same time, too long a chimney can cause excessive, strong draft, which will literally tear off the flame from the boiler burner.
We strongly advise you to call specialists in case of problems in the operation of the gas boiler! Only they will be able to accurately determine the reason for the shutdown of the device and eliminate it.
Errors in the design of the chimney
If it's all about the wind that enters the chimney pipe, then first of all it is worth checking correct design and fortunes chimney system.
First of all, it is necessary to verify the design documents of the chimney with the actual system, as well as the compliance of its design with the installed equipment. If discrepancies are found, either complete replacement chimney, or revision.
Parameterswho must match chimney for its correct operation:
- the design values of the diameter must be exactly the same as specified in the documentation;
- the pipe channel must be clean and allow air masses to pass freely;
- the free part of the pipe must be insulated using materials, not subject to combustion.
Installing a specially designed deflector
To achieve the maximum result in solving the problem, what to do if the boiler goes out in the wind, allows a deflector of a special design - an aerodynamic device installed on the chimney.
In a simple deflector, the main function is performed by the outer part, which is affected by the air flow. At the point of contact of the air flow with the surface, a rarefaction zone is created, which increases the draft in the chimney duct. As a result of using a simple deflector, thrust can be increased by 15-20 percent. Consequently, devices with a more complex design will be much more effective.
Complex structures are installed in the case when the use of a conventional deflector does not help to solve the problem of blowing out the boiler by gusts of wind. Of the large number of deflectors of complex design, several types are distinguished, which are most often found on the consumer market:
- Deflector "Smoke tooth".
- Deflector Grigorovich.
- Deflector "Voller"
- Deflectors are spherical and rotating.
The leader among the listed options is the Grigorovich deflector, so a little attention can be paid to its device.
This device has a special design, in which each contour and element is directly related to aerodynamics. If a simple deflector installed on a pipe of a private house is made in the shape of an umbrella, then the Grigorovich deflector is distinguished by the presence of a forward and reverse cone. Due to their interaction, the necessary movement of air flows is created, as a result of which a zone of reduced pressure is created around the chimney. Different temperatures of hot and cold air streams multiply the draft in the chimney and prevents the penetration of air from the outside into the chimney.
Deflectors, which have a complex design, make strong gusts of wind work to increase the draft in the chimney. In any case, the air masses fall under the lower cone of the deflector and suck in the flow coming from the boiler into the chimney duct.
The correct positioning and arrangement of the chimney in combination with a deflector of a complex design allows you to solve the problem of backdraft.Due to this, gusts of wind of any strength do not blow out the flame of the boiler burner, but only increase the draft in the chimney, allowing the equipment to work more efficiently.
Particular attention should be paid to situations when the gas boiler goes out in the wind, and starting the heating system does not give a positive result. In this case, the reason is an insufficiently heated chimney.
Country houses and cottages are rarely visited, so the heating system does not function for a long time. As a result, the first start-up of the heating boiler does not lead to anything, the burner flame extinguishes after a short period of time. Many owners are wondering what is the reason for this behavior of gas heating equipment. The fact is that the waste products of combustion with great difficulty rise up the cold chimney, and a gust of wind of any intensity does not allow the channel to warm up.
To solve this type of problem, it is necessary to turn on the boiler at minimum power and warm up the chimney. In this case, the power of the device gradually increases to certain values. As a result, the hot stream with the products of fuel combustion rises naturally.
Of great importance in creating an effective heating system in a private house are competently performed calculations when drawing up a project
However, the ventilation system is equally important in this case. Correctly chosen design and high-quality installation of ventilation will ensure the smooth operation of heating equipment
Saving on exhaust and ventilation when deciding what to do to prevent the boiler from blowing out can give a negative result during operation
Therefore, special attention should be paid to the ventilation system when planning the house, otherwise the aesthetic appearance may turn into discomfort in the winter. There will be a need to re-equip the chimney channel and climb to the roof in any frost
https://youtube.com/watch?v=QFqyaaim-HE
General description of the problem
The device of a gas heating unit is very difficult. Blowing out the boiler often entails system malfunctions, which manifest themselves in the form of inability to start the device or spontaneous termination of work.
Sometimes it happens that the burner turns on, and after a couple of minutes it goes out. This is mainly due to strong wind flow, but there are also others:
- lack of necessary pressure level gas mixture;
- gas does not meet the required quality parameters;
- system providing smoke removaldoes not work correctly;
- failures in the operation of the electrical network, which over time lead to breakdowns of the device.
Important: the reason for the attenuation of the device may be more than one factor, it is worth considering initially the totality of those and excluding one by one.
But one of the most common reasons that lead to blowing out of the boiler is reverse thrust condition, in other words, the effect of the wind. Much depends on the type of boiler installed: atmospheric or turbocharged, the effect of the wind on them is different.
Read about other malfunctions in the operation of the gas boiler here.
Deflector manufacturing
The simplest version of a deflector such as a Volpert-Grigorovich device is quite simple to make with your own hands.
Required tools and materials
- Marker or felt-tip pen.
- Ruler.
- Iron scissors.
- Mallet.
- Wooden bar for the stand.
- Riveting device.
- Drill, drills for metal (or - drill-point self-tapping screws).
- Galvanized iron sheet 0.3–0.5 mm thick (aluminum sheet or thin stainless steel is suitable).
- Available metal parts: corner, pins, thick wire, and the like.
Calculation of dimensions and scheme
Since the quality of the deflector's work depends on the accuracy of manufacturing, drawing up the correct drawing is the most important stage in the entire process. The dimensions were verified by scientists in a wind tunnel, and they must be followed. The parameter from which you need to build on is the diameter of the chimney channel D.
The dimensions of all parts of the deflector are set in proportion to its diameter
Table: dimensions of the deflector parts in relation to its diameter
| Indicator | Coefficient in relation to diameter |
| Bottom diffuser diameter | 2 |
| Upper diffuser diameter | 1,5 |
| Diffuser height | 1,5 |
| Recessing the pipe inside the diffuser | 0,15 |
| cone height | 0,25 |
| umbrella height | 0,25 |
| reverse cone height | 0,25 |
| Gap between umbrella and diffuser | 0,25 |
Instructions for making a deflector with your own hands
- We transfer the drawn details to cardboard and make a cardboard layout. We check the correspondence of the parts to each other.
- We open the layout back. We outline this cardboard pattern, laid on a galvanized sheet, with a marker.
- We cut out all the details with scissors on the iron.
- We roll up the casing and drill holes in its edges.
- We fasten the casing with rivets (or do not drill and do not fasten, but use drill-point self-tapping screws).
- In the same way, we fasten the lower and upper cone plates in turn.
- The top plate is larger, so we cut 6 feet in the edge to attach it to the bottom plate.
- We attach studs to the bottom plate for connection with the casing.
- We attach an umbrella to the casing with them.
- To strengthen the finished deflector on the chimney, it is better to separate the top of the pipe and connect it to the deflector on the ground. The strength of this connection is extremely important. The wind load at altitude will be heavy and may interfere.
The deflector may not turn out to be very beautiful, but you will immediately feel its usefulness: the draft will increase by a quarter, the roof will be protected from sparks. The pipe with it can be one and a half to two meters lower.
Video: self-manufacturing of the TsAGI deflector
You will immediately feel the benefits when installing any traction amplifier. But a self-made deflector will also create a weighty reason to make you proud of yourself.
Reasons for blowing out turbocharged boilers
Devices equipped with turbocharged systemare characterized by their stability in operation, regardless of the heating circuit. They are equipped with an electronic pressure system and compulsory combustion products removal system... However, there are failures in their work, which are signaled by thrust sensor... In this case, this problem is mainly caused by incorrect installation of the device... In addition, it is very important which boiler was chosen for installation in the house - unsuitable device will not work properly.
In the operating instructions for this type of device, special attention is paid to boiler installation site... It must be well ventilated. When wrong selected place or the frequent change of the wind rose in the area where the house is located, device malfunctions are eliminated manually... The reasons and ways of their solution are considered by analogy with atmospheric devices.
Problems, which are found among the owners of private houses with a heating system using a gas boiler, are quite a lot. But that's not the reason refuse from such a convenient heating method, because their correct and reliable operation rests on competently designed chimney and ventilation system... By approaching these points scrupulously, you can avoid various problems.
Watch the video why the gas boiler is blowing in the wind:
Chimney reconstruction is one of the solutions to the problem
The first sign of constant flame extinction is an incorrect chimney design. There is no point in looking for other reasons why a gas floor boiler blows out in the wind, with such equipment. Gas supply is carried out under constant pressure, there are almost no significant differences.Any equipment malfunctions are unlikely, since modern boilers are reliable and simple in design. For example, the Conord boiler is known for its reliability and performance.
As for the chimney, here the answer to the question of why the boiler blows out in a private house is the following:
The ventilation duct of the heater is covered with an ice crust. As a result, the air circulation inside the chimney is disrupted and the gas boiler does not receive enough oxygen. In addition, water vapor enters the chimney channel, which is cooled from the ice layer and forms condensate. In turn, water droplets freeze on the walls of the chimney and the ice crust grows. The insulation of the chimney helps to solve the problem of what to do to prevent the gas boiler from blowing out. In this case, the resulting condensation will flow down the walls. Back draft due to insufficient chimney height. The increasing or changing direction of the wind creates a strong air flow that enters the chimney duct and reaches the fuel combustion chamber. As a result, the flame in the burner is extinguished.
This situation is considered more dangerous, so it is important to know what to do when the boiler blows out in strong winds. The return movement of warm air along the way captures the combustion products, therefore, they enter the boiler and pollute the combustion chamber
The ingress of harmful gases into the dwelling is not excluded.
What type of gas boiler to choose so that the flame does not blow out
The minimum speed of flue gases at which the flame will not blow out is 6-8 m / s. The streams of heated air entering the chimney move in a spiral. The vortices gradually increase in speed, which reaches their maximum intensity at the exit from the chimney.
There are boilers in which the natural movement of flue gases is replaced by forced ones. In the design of turbocharged models with a closed combustion chamber, two blower fans are provided. The first supplies air to the furnace, the second removes the combustion products. It is impossible to blow out a turbocharged unit with the wind. Attenuation indicates that one of the failed fans needs to be replaced.
