Removing air from the heating system: how to release the air lock
Occurrence of air s in the heating system is accompanied by uneven heating of appliances and alarming noise in the pipeline. The coolant moves “jerkily” along the circuit, increasing the likelihood of water hammer. Agree that any reasonable owner would like to eliminate these phenomena.
A simple action. removal of air s from the heating system. can eliminate and prevent the negative effects listed above. How to do it? How to properly assemble the circuit, which devices should be installed so that the air was removed in time, you will learn from the proposed article.
Presented for reading information is based on regulatory documentation. We have described all possible methods used against the formation of air blockages. To optimize the perception material is supplemented by photo-sets, diagrams, videos.
Filling the heating circuit with the heating medium
In order for the heating system to work properly it must be flushed and then refilled with water. It is often at this stage that air leaks into the contour.
This is caused by improper actions during the filling of the circuit. In particular, air can be trapped by the excessively fast flow of water, as mentioned above.
The diagram of an open heating circuit expansion tank shows how to fill such a system with the heating medium after the flushing process
In addition, the correct filling of the circuit also contributes to the faster removal of the part of the air masses that are dissolved in the coolant.
To begin with it makes sense to consider an example of filling an open heating system with an expansion tank at the highest point.
Fill such a circuit with the heating medium, starting from the lowest part of it. For this purpose there is a shut-off valve installed at the bottom of the system through which tap water is fed into the system.
A properly installed expansion vessel has a special pipe that protects it from overflowing.
It is necessary to put a hose of such length on this branch pipe that its second end is led out to the site and is located outside the house. Before you start filling up the system you need to take care of the heating boiler.
It is advisable to turn it off for this time to prevent the safety modules of this appliance from activating.
Once these preparations are made the filling of the circuit can begin. The tap at the bottom of the circuit, through which the tap water enters, is opened so that the water fills the pipes very slowly.
The recommended filling flow rate should be approx. 3 times lower than the maximum possible filling flow rate. This means that the tap should not be turned off completely, but only about one-third of the way through the pipe
How to get rid of the trapped air in coolant system.
Continue filling slowly until the water flows through the overflow hose connected to the outside. Then close the water tap. Now go through the whole system and open the Mayevsky tap on each radiator to bleed air.
Then the boiler can be reconnected to the heating system. It is also recommended to open these taps very slowly. A hissing noise can be heard as the boiler is filled with the thermal fluid, which is emitted by the venting safety valve.
This is normal. After that the system needs to be refilled with water again at the same slow pace. The expansion tank should be filled up to approx. 60-70%.
After that it is necessary to check the operation of the heating system. Turn on the boiler and heat the heating system. Then the radiators and pipes are examined to find out where the heating is absent or insufficient.
Insufficient warming up indicates the presence of air in the radiators, you need to run it again through the cocks Maevsky.
If the procedure of filling the heating circuit with the coolant was successful, do not relax.
For at least another week the system should be closely monitored, monitor the water level in the expansion tank, as well as check the condition of pipes and radiators. This will enable problems to be corrected as quickly as possible.
Filling a closed heating system with the working fluid must be done in the same way. The water in the system should also be fed at a slow speed through a special tap.
Filling of the closed heating system with the working fluid (coolant) can be performed using your own resources
It is important to arm yourself with a manometer. But in such systems it is important to control the pressure
When it reaches a level of two bars, you should turn off the water and bleed all radiators through Maevsky taps
But in such systems, pressure control is important. When it reaches two bars, you must turn off the water and bleed all radiators through the Mayevsky cocks.
At the same time the pressure in the system will begin to decrease. Add coolant to the circuit little by little to maintain the pressure at two bars.
To perform both of these operations alone is difficult. Therefore it is recommended to fill a closed loop together with a helper. While one person deflates the radiators, his/her partner checks the pressure level in the system and corrects it at once.
Working together will improve the quality of this type of work and reduce time.
In order to find ways to bleed air from the radiator which does not have a Mayevsky tap to understand the main question:. “Is it necessary to flush it out if when installing a cast-iron radiator, the tap on the radiator is not.
How to expel the airThe question:. Is it possible to expel the air from a cast-iron radiator with a screw?Answer:. It is possible, but dangerous. With such a radical method, you need to be able to instantly turn off the heating riser. If something goes wrong In the article
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Ways to remove the air lock
Since one or more of these factors may be present in many homes, the question of removing air from the heating system necessarily arises. This operation can be carried out in various ways. It all depends on what kind of coolant circulation we are dealing with. natural or forced.
In a heating system with natural circulation (refers to the upper distribution of pipes) the air lock can be removed through the expansion tank. it is located at the highest point of the whole system.The flow pipe should be routed upwards to the expansion tank. With the lower distribution of pipes, the air is vented in the same way as in heating systems with a circulation pump.
Bleeding of a naturally circulating heating system is possible using an expansion tank
In heating systems with forced circulation of the coolant at the highest point is installed air collector, specially provided for air release. In this case the supply pipe is installed ascending in the direction of the coolant flow, and rising air bubbles in the riser pipe are removed through air cocks (installed at the highest points). In all cases, the return flow must be installed with an inclination towards the direction of the water outlet for faster emptying in the event of a repair.
Scenario 1: multi-family house, bottom connection
The bottom outlet scheme is the most typical solution for modern buildings. Both return and supply pipes are in the basement. risers connected to the outlets are connected in pairs (flow and return) with a bridge on the upper floor or in the attic.
Bottom outlet: the heating supply and return flow are routed through the basement.
Start the elevator on the discharge
Removal of air from the heating system is carried out by employees of housing and communal services at the stage of startup of a fully or partially drained circuit.
- One of the house gate valves opens and the other remains closed;
- A bleeder connected to the sewage system is opened in front of the closed gate valve on the heating circuit side.
Most of the air is discharged as evidenced by an even flow of water without air bubbles in the bleed.
An air vent is always installed at the highest point of each riser pair (in the radiator cap or at the bridge led out from the ceiling) in the bottom-flush systems. It does not have to be a specially designed bleeder: it can be successfully replaced by a ball valve, a screw valve or an upward-mounted water tap.
The air vent may well look like this.
- Open the tap (no more than one turn). You should hear a hiss of air coming out;
- Place any wide dish underneath it. A can or bucket will save you the trouble of wiping up a puddle on the floor;
- Wait until the air has been replaced by water;
- Close the faucet. The standpipe should warm up within 5 to 10 minutes. If it does not, deflate the air again: it is possible that the circulation that started before has expelled new air bubbles to the upper point of the circuit.
- Never unscrew the screw in the faucet Maevsky completely. With pressure of 5 or 6 atmospheres and boiling water spurting out of the hole you have no chance at all of screwing it back in. The consequence of ill-considered actions will flood your apartment and the apartments below you on the riser with hot and dirty water;
- Do not unscrew the air vent itself under pressure. Even half a turn: you do not know in what state its thread. If the drain valve on the heating is faulty, before repairing or replacing it, you need to shut off both steam risers and make sure that the valves on them hold water;
You can only unscrew the air vent when the risers are drained.
If you live on an upper floor, make sure you have something to open the air vent before the heating season begins. Modern cocks Maevsky open with his own hands or with a screwdriver, but in the houses of the old construction may need a special key;
Draining the riser pipe
The main problem with ventilators on the lower riser pipe is that they are located in the apartment on the upper floor. What to do if the tenants are chronically absent?
Steam risers can try to skip from the basement.
- Examine the risers. After the valves can be installed dumpers or stopping plugs. In the first case there will be no expenses, in the second. you need to buy a ball valve with threads “dad-mom” of the same size as the plugs;
Ideally. Both paired riser pipes are equipped with dumpers.
- We block the valves on both risers;
- Unscrew the plug on one of them;
- Screw in the ball valve instead of the plug, pre-winding the thread;
- Fully open the installed dumpster;
- Open the valve on the second riser. After the water pressure has expelled all the air, close the drain and open the second riser.
If all radiators are located on the supply riser, and the return riser idle (without heating appliances). place the reset exactly on the return. In this case all the air is guaranteed to come out. If there are batteries on both paired risers formed air plug can not always be kicked out;
- If you were unable to bypass the risers in one direction. move the resetting valve to the second riser and re-route the water to the opposite side;
- If there are screw valves on the risers, avoid flowing water through them in the direction indicated by the arrow on the body. Attempting to open the valve with the valve pressed to the seat is fraught with valve separation from the stem. You often have to reset the entire home heating system to fix the problem.
Using the Maevsky faucet
The device is very popular because of its simplicity. If the system is airy, it helps to blow out any excess air in the heating pipe. Mevskogo valve is a compact handy air vent, which is mounted on the side of the battery. When the pipes are clogged, you should take a screwdriver and a small container, because in addition to releasing air, some water will flow out.
Important to know: air shortens the life of the water pump!
With a screwdriver you need to unscrew the faucet and put a container. Further, if the cause of bleeding has occurred, you will hear a hissing sound, after which the air will begin to escape with water droplets through the air vents. The air is fully deflated when there is a small trickle of water running through the drain. This will increase the service life of the boiler. While the system presses through the bleeder, water droplets can occur.
Plugs on cast iron radiators
To bleed air from cast-iron batteries of the old type at the plugs are sometimes installed special valves.
They cut in Maevsky’s taps or ordinary water taps.
If the cast iron radiator is installed on the old standard plug, to bleed air directly through it is impossible. Therefore, in a private home is recommended to equip all the radiators with valves, resorting to the services of professionals or yourself.
It is not reasonable to install devices in apartment buildings, as a higher pressure of the coolant and the construction of heating schemes involve centralized bleeding of the entire riser.
Working with valves and faucets installed on cast iron radiators, similar to the bleeding algorithm using a Maevsky cocks.
Occurrence of air corks in the radiators can arise for various reasons, some of them can be easily solved by the descent of the air cork from the battery through a special Mevsky faucet, specially designed for that would squeeze out the surplus.
Regulation of radiators in apartment buildings with manifold distribution very often require adjustment due to the fact that the radiator heating air accumulates in the radiators, which should either be regularly flushed with a Mayevsky tap which is not very convenient or.
Prepare the sledge in summer. says a Russian proverb. Which is directly related in meaning to replacing heating radiators in August as a deadline for replacing heating radiators at the lowest. summer prices. Summer prices.
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