Finally, I was ready to answer the question - where does the air in the heating system come from? To do this, I had to fix my system and leave it alone for a long time, at least two years to be exact.
Dmitry Belkin
In this article I will finally tell you where the air in the heating system comes from.
Air in the heating system
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Why are air locks dangerous?
The performance of a closed heating system depends entirely on the circulation of the coolant and the supply of a certain amount of heat to the radiators. If air appears in a closed heating system, the normal movement of fluid is disrupted. This phenomenon is considered unpleasant and can cause:
- characteristic noise during water movement. It should be noted that the pipes begin to vibrate, connections weaken, welds are destroyed;
- Air pockets form in the system. Air accumulated in remote areas of the system can disrupt water circulation, and if measures are not taken in a timely manner, the system can be defrosted;
- the efficiency of the heating system decreases, the consumption of fuel resources increases;
- Inside, air enters metal surfaces, contributing to the formation of corrosion.
Air accumulations in the heating system contribute to a shortening of its operational period and premature failure of the equipment.
This is a security group. An automatic air vent is installed at the middle outlet
Not all air locks give up so easily. For particularly stubborn ones, it is necessary to simultaneously raise the temperature and pressure. These parameters are brought to values close to maximum. You cannot exceed them - it is too dangerous. If the plug does not go away after this, you can try to open the drain valve (to drain the system) and the make-up valve at the same time. Maybe this way it will be possible to move the air lock or get rid of it altogether.
If a similar problem occurs constantly in one place, there is an error in the design or wiring. In order not to suffer every heating season, a valve is installed in the problem area to remove air. You can cut a tee into the main line and install an air vent at the free entrance. In this case, the problem will be solved simply.
Reasons for the appearance of air in the system
Where and why does air appear in the system if everything is sealed? There is no definite answer, but most often this happens in the following cases:
- the requirements for maintaining the slope of the pipes were violated;
- improper filling of the system with water, resulting in air remaining in the pipes;
- poor connection of components;
- lack of automation that independently removes air from the pipes, or its failure;
- performing repairs during which air definitely enters the pipes;
- filling the system with fresh water, which contains a lot of dissolved air. As soon as the temperature begins to rise, its content in the liquid decreases, and air pockets begin to form;
- the appearance of rust inside the system.
Improper filling of the system with water can cause air to appear
. These reasons cannot cover all possible cases, but with their help you can understand why the system is airy and take timely measures to remove the air lock.
How to prevent airing
Air vents can be installed to prevent air pollution. They must be installed in pipe bends or at high points where pipelines are located.
You can also fill the equipment with water. During the process of filling with water, it is necessary to open all taps except those that drain water. Water is supplied from bottom to top. When carrying out such actions, water squeezes air out of the system. But do not forget that water should be supplied slowly. Once water starts flowing from the tap, it must be turned off. Thus, the water will continue to rise higher until the entire system is full.
Signs of air in the system
The accumulation of air in the heating system and the need to remove the airlock can be determined by the following signs:
- There is noise in the radiators. If the sounds resemble gurgling, then we confidently state the fact that air has appeared in the system;
- Batteries warm up unevenly. If you pay attention to the heat output of the radiator, it will immediately become clear what the main cause of the problem is. In addition to the dirt present inside the battery, an air lock may appear. The pipes remain hot, and the temperature in the radiator decreases slightly;
- A pressure drop can serve as a signal to bleed air in the heating system. In this case, it is necessary to carefully check the pipes for their integrity and the tightness of the joining areas and welds.
The signs given here are quite sufficient to understand that the system should be de-aerated.
Choosing an air vent: expert advice
Such an important mandatory safety device for any heating network as an automatic air vent for heating must be chosen correctly. It is usually supplied complete with other boiler equipment
If the home owner still has to choose an automatic air vent on his own, it is recommended to pay attention to the quality of the material from which the valve is made. It is necessary to protect yourself from all kinds of silumin fakes that imitate copper modifications
Professionals recommend choosing automatic devices with exhaust pipes directed upwards. According to reviews from numerous customers, on models with side outlets, leaks occur much earlier. In addition, during installation it is necessary to ensure the vertical position of the device.
Main recommendations for selecting air vents:
- It is more reliable to purchase a motorized air vent with a plastic or iron handle; this eliminates the need to carry various keys or screwdrivers with you. This faucet is convenient to use even in hard-to-reach places.
- In the case where young children live in the apartment, it is recommended to install an ordinary manual air vent, made for screwdriver control. Otherwise, children will be able to unscrew the air vent with a handle and scald themselves with boiling water.
- It is advisable to purchase devices with a self-acting cut-off device.
- If the estimate allows, it is possible to order a mechanism with additional options that can make servicing the heating network more comfortable.
- The high-quality anodized coating of the air vent essentially plays absolutely no role, but only reduces the level of rust formation on metals.
- Today in the retail chain it is possible to find combined modifications of heating network devices, which are also equipped with air vents. This list includes balancing valve devices, a variety of shut-off and safety valves and electric coolant circulation pumps.
Ways to solve the problem
In order to prevent the heating system from becoming airy, it should be properly designed and installed, periodically cleaned and filled with coolant without undue haste. Let's consider the main ways to help avoid such negative manifestations.
Correct installation
In heating systems in which the coolant circulates naturally, with the upper type of wiring, air is removed through the cover of the expansion tank. When installing such a system, the supply line is installed so that it approaches the tank vertically.
The tank, which provides free space for the expansion of the heated coolant, must be installed at the top point of the entire system to ensure the natural flow of liquid into the system circuit.
The return line is also installed with a slope along which the liquid moves freely.
Correct installation will help prevent air from entering the heating system.
If the installation of the heating system is carried out without errors, then the air appearing inside the circuit will be gradually squeezed out by the hot liquid to the top point, leaving the pipes through the open cover of the expansion tank.
Installation of air vents
How to promptly remove air accumulated in the heating system?
An open expansion tank must be installed in the upper part of the heating system, and a hermetically sealed one must be placed in the place where the return flow enters the boiler (before the pipe enters).
In such a system, supply pipes can be mounted without tilting, and the coolant will move under the influence of a circulation pump. In addition, other devices are installed through which air is discharged.
Air can be vented from the heating system itself through special air vents operating in automatic mode, installed on the rotating sections of pipes and at the highest point of the system. The plugs are removed from the radiators using a Mayevsky tap. Using the same principle, air is removed from the circuit through which water circulates naturally, but in this case, lower pipe routing must be done.
If everything is installed correctly, then there will be no problems with how to expel air from the heating system. It is enough to open the necessary taps, and as soon as the air leaves the system, close them again. Air vents operating in automatic mode do not need to be opened at all - their operating principle is based on changes in pressure.
If a closed heating system is installed, an automatic air vent must be installed in it. They are installed along the contour in certain places so that air pockets are removed locally. The idea is that each part of the heating system circuit must have the ability to vent air. An example of this is Mayevsky taps, which are installed on all radiators. Open them with a key or a screwdriver, allowing air to escape from the system. The procedure is quite simple, but with its help you can distribute the coolant evenly throughout the radiator.
An air vent can solve the problem with air in the heating system
To extend the operational life of the automatic air vent, it is necessary to install good filters and regularly flush the system.
Coolant heating
Sometimes, in order to remove excess air naturally, the coolant is simply heated strongly. An increase in temperature stimulates the release of air and its movement along the system circuit. It is allowed to heat the liquid in the pipes up to one hundred degrees.
If after such an operation air pockets appear again, it is necessary to check all connecting areas for leaks. Almost always, near the place where the air jam forms, there is a small gap from which water oozes out in small drops and into which air gradually penetrates. By sealing such a gap, you will immediately get rid of the annoying problem.
Radiators made of aluminum material are considered the most vulnerable places through which air passes. When an alloy is exposed to hot water, corrosion processes develop, accompanied by gas emissions.
If such radiators often become airy, it is recommended to simply replace them.
Preventive measures
We figured out why air appears in the heating system and how to deal with this negative fact. It remains to be seen whether there are preventive measures that help avoid such problems. It turns out yes:
- when installing a heating system, it is necessary to provide for the installation of special devices that automatically remove air;
- Before adding water to the heating system, you should bleed the air;
- During operation, you should monitor the operation of the entire system by observing the readings of pressure gauges and from time to time monitoring the pressure in the pipes. In addition, it is recommended to monitor the level of coolant in the expansion tank, conduct a visual inspection of pipes and radiators, and check the uniformity of heat distribution along the circuit;
- The system should be periodically pumped to remove all blockages.
The implementation of this set of measures will extend the operational period of the entire heating network.
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In addition to fast and high-quality repair of heating pipes, we provide professional installation of turnkey heating systems. On our heating page > resant.ru/otoplenie-doma < you can view and get acquainted with examples of our work. But to be more precise, it is better to check with an engineer about the cost of work and equipment.
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