Every owner of a private house or apartment with water heating should know how to bleed air from a heating radiator. The thing is that the accumulated air in the radiator becomes an insurmountable obstacle and blocks the flow of coolant.
As a result, the heating radiator ceases to function fully, that is, all or part of its surface ceases to heat up and release heat to the surrounding space.
Airing of the panel heating device (blue color)
To eliminate this phenomenon, you need to bleed the air from the battery. How to do this in a timely and effective manner will be discussed in this article. Carrying out such an operation does not cause any particular difficulties if the heating system is assembled correctly, taking into account all the features of water heating of premises. Throughout the heating season, it is necessary to carry out preventive measures of this nature from time to time.
Causes and signs of air locks in the heating system
The appearance of air pockets inside radiators is primarily associated with the startup of the heating system at the beginning of the heating season and after its overhaul. But practice shows that airing can occur during intensive use of the heating network. There are several reasons for this:
- unplanned repair work (assembly and disassembly) of heating system elements;
- overheating of the coolant, resulting in the release of gases that will air the batteries;
- use of contaminated coolant with air impurities;
- adding additional water to the system;
- connection points of radiator elements and pipelines begin to let water through;
- When installing the heating system, the radiator collectors were not horizontal;
- lack of automatic air bleeding;
- contamination of internal passages in radiators with rust;
- low pressure in hot water pipes.
Signs of airiness may include:
- Tactilely sense cold areas of the battery surface;
- The room temperature drops;
- In autonomous heating systems, an increase in fuel consumption becomes noticeable;
- In the radiators you can hear the coolant gurgling and babbling.
Dangerous consequences of airy radiators
Accumulation of gases in the heating system leads to the formation of air pockets. The radiators become cold, the pump cannot push the coolant through the air blockages. This can lead to failure of not only the pump, but also the boiler itself. Lack of normal water circulation in the system will cause them to overheat and ultimately break down.
Don’t know where to complain if there are cold radiators in the apartment?
In places where there is small accumulation of air, which does not greatly affect the heating of radiators, pockets of corrosion may occur. Oxygen actively interacts with the metal of the battery, which causes rust and destruction of the wall of the heating device segment.
The result of corrosion of the battery collector from air pockets
Uneven heating of the metal causes deformation forces, which negatively affect the tightness of the connections of radiator elements and pipes. As a result, the system will leak and hot water will flow out.
When to bleed air from batteries
Any gas is much lighter than water, and therefore, when it enters the radiator, it begins to accumulate at the top point. If the process continues, the air begins to expand and lower the water level. As a result, 50% of the radiator volume or more may remain without water. The heating device practically stops functioning. Therefore, it is necessary to bleed the air from the batteries in any case.
To know when you need to bleed air from a heating radiator in an apartment in a multi-story building, you need to understand when it most often gets there. This occurs under the following circumstances.
- At the end of the heating season in the summer, heating services carry out preventive measures, during which the coolant is drained from the system, both partially and completely. Before the onset of cold weather, new water is poured into the system. Along with it, gas mixtures enter the radiators.
- Owners of private houses often repair their own autonomous heating system in the summer. As a result of inept actions, air enters the heating system.
- In apartment buildings with cast iron radiators, water is specially drained in the summer. This is done to avoid work on replacing gaskets between the registers. If coolant is left in the system, then old radiators may leak at the junctions of sections due to water cooling and pressure drop. When you have to start the heating system again, a large amount of air will enter it.
- During the summer period, the volume of coolant noticeably decreases in volume. When the shut-off valves are opened, due to negative pressure, the water being poured in absorbs gases and fills all risers with them.
The tap does not open
Sometimes it is not possible to bleed the air in the battery for one simple reason - the tap is rusty. In such a situation, it is important not to rush. If you apply too much force, you may strip the threads. Then calling repairmen cannot be avoided.
Try softening the rust by soaking the threads in kerosene or WD-40. After applying the product, wait 5-10 minutes. Turn the screw again. Now he must give in. To avoid recurrence of the problem, turn the valve back and forth 1-2 times a year.
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How to bleed air from heating radiators in an apartment
Bleed the air from the heating battery, possibly using an air valve. Today there are two ways to release a mixture of gases correctly. This is done using a Mayevsky crane or an automatic air vent. In old cast iron batteries, plugs can only be removed through a regular tap or plugs.
How to remove air from a heating radiator? Bleed the air from the battery! Three different Mayevsky cranes!
Bleeding air in radiators with a Mayevsky valve
In products of the latest generation, namely aluminum, bimetallic, steel and cast iron radiators, manual air vents - Mayevsky taps - are installed to remove air plugs. The device is a needle type valve.
How to bleed air from radiators. Mayevsky crane. Multi-storey building. The radiator is cold.
The taps are available in two types, with a rotary handle or a screw. In the first case, you will not need a tool, but in the second option, you will need a screwdriver. In order to reset traffic jams, actions are performed in a certain order.
- Prepare a container (for example a bucket), a screwdriver and an adjustable wrench.
- Using an adjustable wrench, turn the plastic head of the valve so that the drain hole is in the lowest position.
- A container is brought to the bottom of Mayevsky’s tap to collect water.
- The blade of the screwdriver is inserted into the slots of the screw and they begin to slowly turn it counterclockwise.
- First, you will hear the sound of air being released, then an intermittent stream of water will appear.
- You need to wait until the stream becomes continuous and flows evenly and silently.
- Stop removing water from the radiator by turning the screw back.
- For prevention, experts advise repeating the process after 1 – 2 hours.
Removing air using an automatic air vent
The device is often called a float because of the principle of its operation. The machine is installed in both a horizontal and vertical position.
When air masses accumulate, the float of the device floats up and puts pressure on the valve. In turn, the valve releases air, and the float returns to its original position.
Despite the convenience, it is necessary to periodically check the functionality of the diverter. The automatic device cannot withstand the presence of contaminants in the coolant. Therefore, they try not to install these devices in apartment buildings with centralized heating.
Bleeding air in old houses with cast iron radiators
In the past, cast iron batteries were equipped with ordinary water taps for venting. They were welded or screwed into the end caps of the upper collectors. The air was released by opening the tap. The process is almost similar to the method of bleeding air from a battery using a Mayevsky crane.
There are batteries without air vents . In this case, the air is released by unscrewing one of the upper plugs of the cast iron radiator with a wrench.
How to remove air from a cast iron battery under pressure, without a Mayevsky tap. Do not repeat! Radiator.
Bleeding air through thermostat
There are cases when the developer did not install a device for relieving air pockets on the radiators, and instead, thermostats were mounted on each battery. You can try to release the plugs by unscrewing the thermostat mounting nut.
However, you should remember that the sealing gasket can be damaged, replacing which will require draining the water from the entire system.
Bleeding air with an automatic air vent
This type of device will function fully automatically. Installation can be carried out on both vertical and horizontal surfaces. In this case, this small device will be responsible for removing air masses from the system. It has a special float that seals the tap, provided that there is enough coolant in the system. When air accumulates, the float will drop and the hole for its release will open slightly.
Automatic air vent
However, such a device is not without drawbacks. It is greatly influenced by the quality of the coolant. In this case, the O-ring and water filters must be changed regularly. Valves need to be cleaned regularly. Otherwise, water will leak out of the battery. With proper care, no outside intervention is required.
How to ventilate batteries in a private home
The autonomous heating system of a private house differs significantly from a centralized heating network. The fact is that the owners of their houses turn to specialized enterprises for the installation of a heating system. Professionals use design documentation that provides for the installation of an expansion tank.
Ventilation system for autonomous heating communications of a private house
The tank is installed at a point that is higher than the entire heating system. Containers can be open or closed. In the first case, airing of the system is eliminated by simply adding coolant to the expansion tank. The closed tank is equipped with a release valve.
Closed expansion tank
The system is mounted in such a way that air pockets are squeezed out of the radiators and lifted into the expansion tank.
When the heating temperature of the coolant increases, the air collected in the tank leaves the container through the open valve.
Ventilation of the heating system of a private house.
Preventing air locks
Prevention of airing of the heating system allows you to minimize the occurrence of such situations when you need to constantly remove air pockets from the heating system. To achieve this, the following preventive measures are carried out:
- installation of Mayevsky taps or automatic air vents on all batteries;
- Outside the heating season, you need to check that the radiators are hung correctly on the walls. If there are violations of the horizontality of the heating collectors, then you need to correct the position using shims for the brackets;
- in areas of the heating system with constant air pockets, float air release devices are installed;
- In autonomous heating systems of private houses, it is advisable to install water filters in them. Purified coolant will not cause air pockets in radiators.
Filling the system with water
- To begin with, we open all the taps (on both sides of the pump, on all radiators, on the water floor collectors, on the expander), and close the Mayevsky taps.
- The system must be filled from the bottom up. The inlet hole is made in the very bottom part (the coolant is drained and filled through it).
- The main valve opens at the top (at the highest point of the system) to release air and slowly fill. There is no need to rush, just so that the air has time to escape. The liquid supply remains open until water flows from the valve.
- The system accumulates the pressure recommended for it as working pressure. Then, one by one, the air is bleed from each radiator in the house (it’s time to close the tap when the water starts to trickle).
- There is a screw in the central part of the circulation pump that can be loosened using a screwdriver. The air is bled from the pump, then screwed on.
- After the air is released, the pressure in the system will drop and the water supply will need to be turned on again to make up for the losses.
- After this, a test run of the boiler is made at a low temperature (about 40 ° C), with the pump turned on. During this start-up, it is recommended to go around and inspect all elements of the system - are there any leaks, is air escaping somewhere, are all radiators heating up evenly. Then, you may need to add water again and then start the boiler in operating mode.
Filling the system with water
If suddenly one of the taps remains closed, and the system is already filled and the pressure is high, you need to open the valve very slowly and carefully. Otherwise, you will get a decent water hammer.
How to bleed air from old-style batteries
To this day, in the housing stock of Russia there are houses built a long time ago with batteries of the MS-140 model. In those days when these batteries were installed, they were equipped with ordinary water taps or simple bolts embedded in plugs with seals to bleed air.
The plugs are reset by simply opening these devices until a continuous stream of water appears without bubbles. If both devices are missing, remove the plugs by unscrewing the plugs, as described above.
How to bleed air from different types of batteries
Based on the material of manufacture, space heating devices are divided into a number of types of batteries with their own characteristics of air bleed - these are radiators:
- aluminum;
- steel;
- bimetallic;
- cast iron;
- copper;
Aluminum
Heating devices made of aluminum are made by extrusion of molten metal. That is, liquid aluminum is pressed into the flask. The material of the radiators is quite soft and deforms at the slightest mechanical impact. For this reason, aluminum batteries are recommended to be installed in private houses with autonomous heating systems equipped with automatic air vents.
Steel
Batteries made of steel are very durable. Therefore, they easily tolerate the installation of both Mayevsky cranes and automatic machines. Sometimes both are replaced with thermostats.
Bimetallic
Radiators that have a steel body covered with aluminum alloy fins are most often equipped with Mayevsky taps. Bimetallic devices are installed in private mansions and apartment buildings. Depending on local heating conditions, the radiators are equipped with automatic air discharge devices.
Cast iron
The peculiarities of cast iron, as a brittle material, force one to be careful when choosing devices for releasing air pockets. Basically, as mentioned above, conventional taps or mortise bolt valves are used.
Copper
This expensive, but excellent in its thermal conductivity, metal requires delicate handling. For copper radiators, special devices are used, built on the principle of the Mayevsky tap. The condition for inserting devices made of the same metal as the radiator itself is met - copper.
All these features of installing devices for bleeding air from batteries made of various materials do not depend on their design, whether they are sectional, tubular, panel, plate or vacuum devices.
Types of air vents and their installation locations
Also called a needle radiator valve, it is distinguished by its simplicity and durability, and is made of brass. The design involves a body and a conical screw. All parts fit tightly against each other and reliably hold water in the battery. When opened, air is released from a small hole on the side. The Mayevsky tap comes in different designs and, depending on this, can open differently.
Installation of such a crane does not require special professionalism. The main thing is to choose the right size faucet. Before installation, you need to drain the water from your battery, and then unscrew the plug in the radiator cap. For greater reliability, you can wrap FUM tape around the thread.
Automatic air vent.
This device automatically removes all gases accumulated in the pipeline, and is therefore undoubtedly more convenient than the Mayevsky tap. Made from bronze and stainless steel. It can be installed with a shut-off valve, which is needed to easily replace the air vent.
An automatic air vent is installed in the highest places of the heating system, since gas is lighter than liquid and rises to the top. Experts recommend installing a diverter behind the boiler, on the collectors and at the highest points where the pipes pass.
Prices for such equipment start at 300 rubles.
Air separator.
The operating principle of this device is based on separating gas from liquid and removes all microbubbles and oxygen dissolved in water from the system. The design uses special PALL rings, and all microscopic air bubbles are caught by their surface. In addition to catching bubbles, separators also catch dirt circulating in the system.
A separator is installed immediately after the boiler, since most of the oxygen is released from the water when heated and is best removed immediately.
Such equipment can be called advanced and the prices for it are correspondingly higher - from 10 thousand rubles.
Multi-stage system.
It is considered the most effective method of removing air accumulated in pipes and radiators. It consists in combining several types of devices in one circuit. Typically looks like this:
- Mayevsky's battery-powered crane.
- Automatic air vent next to the boiler.
- Air vents on the manifolds.
- Separator after the boiler.
The best option usually costs more than the others, and our case is no exception. The exact price is determined from a specific scheme.
