Heizen, 3/4″, brass.
Safety group for heating - an element of the heating system that ensures it safe work(protection against excessive pressure), as well as automatic air removal.
Design
The safety group includes a nickel-plated brass (bronze, cast iron or galvanized steel) body on which devices are installed that ensure stable operation and safe operation of the heating system:
- . It is one of the main elements of the security group, because It is he who, in the event of an emergency, will not allow the pressure in the system to exceed the set value and damage individual elements of the heating system. As a rule, for heating systems of private houses, the response threshold of the relief valve is 3 atmospheres;
- Automatic air vent. Allows you to automatically, without human intervention, remove air from the heating system. All you need to do to start the air vent is to unscrew the locking cap a few turns. As a rule, manufacturers supply air vents with screwed caps, which prevents dirt from getting inside the device. Automatic air vents are sensitive to contamination, including the cleanliness of the coolant. If the system is not equipped with coolant cleaning devices, the air outlet can often become clogged with various contaminants (rust, sand, scale, scale, etc.);
- Pressure gauge. Shows the pressure in the heating system.
Note! The packaging of the group itself, made of foam plastic or foamed polyurethane/polypropylene, is often used as thermal insulation for the body of a security group.
Some manufacturers equip the air vent and pressure gauge with special shut-off devices that allow you to quickly remove devices without draining the coolant from the system. When unscrewing the air vent or pressure gauge, the shut-off device automatically shuts off the flow of coolant.
There are safety groups for the expansion tank, which differ in that they have a special housing designed for wall mounting of the expansion tank. In addition, they are equipped with fittings that allow the tank to be removed for repair or replacement without draining the coolant from the heating system (conventional ball valves are also often used for these purposes).
Security group installation
The safety group must be installed at the outlet of the boiler or. In this case, it is prohibited to install any kind of equipment on the pipeline section between the boiler and the safety group. shut-off valves or (because otherwise when overlapping shut-off valve, or if the filter is clogged, the boiler will be left without protection, which can lead to dire consequences). In addition, installing a tap/filter will narrow the cross-section.
Important! Over time, the plastic spool of the relief valve may become sticky. To prevent this, you should open the valve from time to time by turning the handle until it clicks. The frequency of such checks is indicated by the manufacturers in the instructions (usually once every 1-12 months).
The device is connected to the pipeline in such a way that the air outlet and relief valve were located strictly vertically. In this case, the pipeline on which the safety unit for the heating system is installed must be higher than the boiler.
When connected to a safety valve drainage pipe, the connection must be made with a stream interruption. When the valve is activated, this will allow you to visually observe the coolant discharge.
Heizen, 3/4″, brass.
In addition, the length of the drainage pipe should not exceed 2 m and have no more than 2 bends, and its diameter should be the same as the diameter at the outlet safety valve. If site conditions do not allow this to be achieved, then the diameter of the drainage pipe should be one size larger than the outlet of the safety valve, but even in this case, the pipe should not have more than 3 bends and be more than 4 m long.
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Installing a heating system in a residential area is a crucial moment that requires certain knowledge. In addition to reliable connection of the entire structure, constant monitoring of the pressure of the water flow in the pipes should be ensured. For remote control There is a boiler safety group installed in a closed hydraulic system. This small detail will be especially useful for owners of heating systems based on solid fuel or gas boilers. Installing the device does not require professional skills; standard plumbing tools will be sufficient.
The figure shows a tee, which represents an integral safety group of the boiler. The brass manifold is connected to a closed water supply system using a coupling, and the main elements are located on the top of the distributor:
- Safety valve
- Air vent
- Pressure gauge
Operating principle and benefits
Each element plays a specific role to avoid emergency situations when operating gas and solid fuel boilers.
- If the fire in the boiler goes out, the water will begin to cool and over time it will expand, which will lead to an increase in pressure in the pipes. The water release valve protects the system from rupture by eliminating excess liquid.
- IN metal case The air outlet has a float connected to the outlet plug. Depending on the amount of air in the pipeline, the float automatically opens and closes the outlet valve.
- The dial with arrows displays the pressure in the entire system. The maximum indicator is 6 Bar. Various models Boilers have their own pressure limits for safe operation; you should familiarize yourself with them before installation.
The benefits of the boiler safety group will become noticeable after several months of use - you will be able to save on the services of a plumber. The heating system will operate without failures and will not require constant supervision of its operation.
Selecting the appropriate security group
When choosing a protecting group, pay attention Special attention on the following aspects:
- Index maximum power boiler for which the protective device is designed.
- The pressure at which the system will operate. Depending on the manufacturer, the figure can vary from 4 to 10 Bar.
- Permissible temperature of water circulating in the pipeline. The models presented on the market allow a flow of no higher than 120˚C.
- Compatible with various coolants: steam, water or antifreeze flows.
- Study the principle and thread of the connection so that you don’t have to look for additional adapters and seals later.
In order for the security group to work more efficiently, before purchasing the device, you need to make an accurate calculation of the power home boiler. Formula for calculation:
S is the area of the house.
U is climatic conditions(indicator depends on the region of the country):
- South - 0.9 kW
- Moscow and region - 1.5 kW
- Middle band - 1.2 kW
- North - 2 kW
If the room is not insulated, we add 50-55% of the resulting product to the boiler power. As a result, the average price of the device in Russia ranges from 1,500 to 1,700 rubles.
Installation rules and features
It is important to remember that the boiler safety group is installed only in closed system heat supply. The device is useless in a design with expansion tank, since it is the open container that protects the system.
Installation of a tee in a closed system
- Selecting a location for installation. It should be a pipe coming out of heating boiler. Installation is carried out in a horizontal position at the top of the pipeline.
- The distance between the boiler and the appliance should not exceed 50 cm.
- There should be no taps or branches between the heat generator and the tee.
- The air outlet is located strictly vertically. When you first start the system, you need to unscrew its cap a little to let out excess air, then tighten it again, but not all the way.
In some models of boilers with wood and coal fuel, the manufacturer pre-provides a pipe for mounting a group of sensors - there is no need to independently search for a site for installation.
It happens that a consumer does not want to spend money on an expensive part from imported manufacturers and chooses the option of assembling a security group on his own. Accessories for protective device can be found in construction stores. Some tips for choosing:
- Do not purchase too cheap parts, for example from Chinese manufacturers. Sensor failure may occur during the first operation, or the valves may not respond to increased pressure at all. You can find inexpensive parts from domestic suppliers.
- Buy an air vent direct type. An angled outlet increases air resistance, which complicates the process and leads to increased pressure.
- Choose a thick-walled brass manifold. To avoid mistakes, compare the weight of different models.
It is not always necessary to purchase and independently install a safety group for a boiler - it all depends on the heat generator. Modern boilers may be equipped with a protective system, so before starting any installation work Please read the heater data sheet carefully. It is possible that the device with sensors is supplied separately and only needs to be installed.
Regardless of the type of boiler in your living space, the safety group will make the heating system comfortable and durable. All costs will be recouped, because expensive equipment will not be subject to emergency situations.
When piping boiler installations, a wide variety of devices are used, which must fulfill their assigned role. One of the most important components is the safety group for heating, it is also called the “safety block”. This block is designed to prevent accidents from occurring in emergency situations. If you remove this unit from the heating system, then after overheating the shell of the unit would simply explode with all the ensuing consequences.
What does the heating safety unit consist of?
The security group includes the following devices, which are installed on the body:
- safety valve;
- automatic air vent;
- pressure gauge
Thus, the security group performs three main functions; let’s look at each of them in more detail.
The safety valve serves to relieve the heating system from excessive high pressure. This valve can only withstand a certain level of pressure; as soon as the pressure in the system becomes higher, the valve is activated and releases excess.
The problem of compensating for excess pressure in the heating system must be solved by an expansion tank. But sometimes there are situations when the expansion tank does not work for some reason. To prevent such misunderstandings, a safety valve is installed, thanks to which excess water is discharged from the heating system with an expansion tank. To prevent water from flowing onto the floor, a tube must be attached to the thread on the side, which is discharged into the sewer.
Important! Antifreeze must not be disposed of down the drain!
Safety valves are manufactured for a variety of pressures; you need to purchase them based on the pressure your boiler operates with. For a private home, you will need a valve designed for 3 atmospheres.
The main task of the air vent is maintenance. Inside it there is a chamber that is equipped with a float, which in turn is mechanically connected to a valve, which opens in the absence of water.
The main function of this device is to remove air during filling of the boiler and system with coolant, as well as during operation. Also, as an additional function, you can call the release of the first steam, which appears when the boiler overheats.
Because of the air vent, the entire safety group is mounted on top of the boiler; this is due to the fact that the air vent must be located at the highest point, since this is where air bubbles tend to go.
Pressure gauge - this device is necessary to monitor the pressure in the heating system. Just as in the case of safety valves, pressure gauges are designed for different sizes pressure. It is necessary to choose such a device so that its use is as convenient as possible: in order to determine the readings, you just need to look at the device, and you do not need to make any calculations.
All safety units operate in the same way, but must be selected based on the pressure parameters for which the pressure gauge and safety valve are designed.
Where to install the security group?
By and large, installation of a safety group for a heating system is not mandatory for all systems, but if desired by the home owner, it can be installed as a safety option on any system.
For example, for heat generators that run on diesel fuel or natural gas, or those whose operation depends on electricity, additional protection is not required in this case. These boilers initially have a high level of safety and, if something happens, they can stop working on their own and stop heating if the pressure and temperature rise.
Note: most often on closed heating systems equipped with electric or gas boiler The security group is installed to make monitoring and service more convenient.
But boilers that run on solid fuel are more inert and cannot stop instantly. Even automated pellet boilers need some time for the fuel to burn in the combustion zone. If the temperature in the jacket rises, the controller or thermostat can instantly shut off the air, but the combustion will continue for some time. The firewood will stop burning, but will continue to smolder, causing the water temperature to rise another couple of degrees.
Only the boiler safety group can prevent boiling and explosion in solid fuel boiler, which is why it is one of the mandatory components for heat generators of this type.
Installing a security group is not a particularly difficult task. Anyone can cope with such a task if they have a standard locksmith set of tools at hand. There are two types of installation:
- installation on the “original” fitting that comes out of the boiler;
- insertion into the supply pipeline at the exit from the heat generator.
The safety group must be mounted in a vertical position at any point in the heating system located above the boiler, but preferably where the temperature is as low as possible.
If the boiler model is wall-mounted, then the manufacturers have already taken care of everything; in such models, the safety unit is installed inside or on the rear wall. And for floor model The safety group will need to be purchased separately and independently embedded into the system on the supply pipe at a distance of 1-1.5 m from the boiler.
The pressure gauge must be positioned in such a way that, without straining, you can see its readings during a routine visit to the boiler room. The coolant that flows out through the safety valve should also be easily replaced, as this is something you need to be aware of.
Important! No valves are placed between the boiler and the safety group!
The diameter of the drain hose must correspond to the diameter of the outlet of the safety valve and its laying must be done in such a way that there are no obstacles when discharging steam or liquid, and in addition, so as not to endanger people.
In order to compact threaded connections It is recommended to use FUM tape, flax with special pastes, polyamide thread with silicone or some other sealing materials that help ensure sufficient tightness of the joints during maximum operating temperature and coolant pressure. After the safety group has been installed, it must be tested for leaks.
How to make a heating safety block with your own hands?
If you separately purchase a safety valve, a pressure gauge and an air vent, and connect them using tees and pipe adapters, you can assemble a safety group with your own hands.
If you purchase all components separately and self-assembly safety automatics, the price will be significantly lower than if you buy a ready-made boiler safety unit:
- safety valve – 6 cu. e.;
- pressure gauge - 10 cu. e.;
- automatic air vent – 5 cu. e.;
- brass crosspiece DN 15 as a collector – 2.2 cu. e.
When choosing components, you must take into account the following recommendations:
- Don't buy the cheapest safety valves. Chinese models, as a rule, begin to leak after the first operation or do not relieve pressure at all.
- Chinese pressure gauges, most often, lie very much. If, while filling the system, the device underestimates the readings, then after heating an accident may occur, since the pressure in the network may jump to a critical value.
- The safety valve must be selected based on the operating pressure of the boiler, which is indicated in technical passport.
- Buy only a straight type air vent, since an angular one creates increased resistance to the escaping air.
- The crosspiece must be made of thick-walled brass High Quality. When choosing, you just need to weigh the more expensive and cheaper model in the palm of your hand, and you will immediately notice the difference.
The body of the security group can also be made independently from scraps polypropylene pipes and fittings, it will cost much less than a factory-made model, which has a lot of brass.
It is also necessary to remember that a safety group made of polypropylene must be mounted only in low temperature systems heating (for example, heated floors, but in no case radiators). The reason is that when the coolant reaches 95 degrees, polypropylene begins to deteriorate, and as a result, a rather unpleasant situation can arise.
Installing a homemade security group is quite easy. The air vent is screwed into the upper terminal of the cross, and into the side terminals - a safety valve and a pressure gauge, as convenient. Finished item must be inserted into the main line next to the boiler.
If you want to make your solid fuel heating boiler as safe as possible, you need to pay attention to thermal relief valves. Their operating principle is as follows: if the coolant overheats, it is discharged from the water jacket of the boiler and the admixture of cold tap water is started.
Conclusion: the purchase and installation of a safety group for a closed heating system is not mandatory requirement for all boilers. Most wall-mounted gas boilers are already equipped with this automation from the factory, which is indicated in their operating instructions.
However, some manufacturers of solid fuel boilers also equip their products with parts for the safety group, but you will have to work hard to install them yourself.
In piping boiler installations they use various elements, each of which performs its assigned function. Some ensure circulation of the coolant, others distribute or block it, and others are responsible for filtering or compensating for the expanding volume of liquid. There are also devices that prevent accidents from occurring in emergency situations. In this article we will highlight the question of what role the boiler safety group plays in the heating system, what it consists of and how to install it correctly.
Design and purpose of a security group
In essence, this simple element consists of three different devices mounted on a common manifold. The latter is made of brass or of stainless steel and has 3 seats in the form of threaded holes.
The collector is equipped with a threaded coupling at the bottom for connection to the heating system. Screwed to it from above:
- pressure gauge;
- automatic air vent;
- relief safety valve.
Accordingly, the heating safety group combines 3 functions; we will analyze each of them in more detail. The pressure gauge is used to visually monitor the water pressure in the boiler tank and the system as a whole. It also plays an important role in filling the pipeline network and setting the pressure when the heating system is closed type.
The main function of the air vent is service. Inside it there is a chamber with a float mechanically connected to a valve that opens when there is no water. The purpose of the device is to remove air when the boiler and system are filled with coolant, as well as during operation. There are also additional function– release of the first portions of steam formed in the boiler tank during overheating.
A safety valve is an emergency device that releases water, steam or a mixture of them if the set pressure threshold is exceeded. It turns out that the principle of operation of the boiler safety group is to control and prevent emergency situations associated with boiling of the coolant in the water jacket of the heat generator. After all, what happens? First, the pressure gauge registers an increase in pressure, then the emerging steam leaves through the air vent, and the last stage is the release of water or steam-water mixture from the system by a safety valve.
If there were no safety group in the heating system, then overheating would inevitably be followed by an explosion of the unit shell with all the ensuing consequences. And so, if you do not take any action, the relief valve will drain water until the pressure is within acceptable limits. In the vast majority of boiler installations, the upper pressure threshold is 3 Bar, although there are instances with a maximum operating pressure of 1.6-2 Bar.
Scope of application
It turns out that a safety group for heating is not always needed, but at the request of the homeowner it can be installed in any system and serve as a safety net. For example, heat generators that burn natural gas and diesel fuel, as well as those powered by electricity, do not require additional protection. These boilers themselves have high level safety and can instantly stop and stop heating if the temperature or pressure increases.
Note. In closed heating systems with a gas or electric boiler, a safety group is most often installed for ease of control and maintenance.
But solid fuel heat sources have great inertia and cannot stop immediately. Even automated pellet boilers take a little time to burn the fuel that enters the combustion zone. Imagine a firebox full of burning wood? When the temperature in the jacket rises, the thermostat or controller will shut off the air instantly, but the process will not stop immediately. The firewood will not go out, but will begin to smolder, and as a result, the water temperature will increase by a few more degrees. Only a safety group for a solid fuel boiler can prevent boiling and explosion, which is why it is an indispensable attribute heat generators of this type.
Note. Most manufacturers initially equip their solid fuel units with a safety group.
Installation instructions
If a wood or coal boiler is not equipped with a safety group, then you can easily buy it separately or assemble it yourself. The main thing here is to choose the right devices for your heat generator. Specifications The automatic air vent does not play a big role, but the pressure gauge and emergency valve are selected according to the maximum operating pressure specified in the operating instructions for the boiler.
In general, installing a security group in a heating system is not difficult; anyone can do it if they have a standard set metalworking tools. Installation can be carried out in two ways:
- installation on the “original” fitting coming out of the boiler;
- insertion into the supply pipeline at the outlet of the heat generator.
Important. When installing the element, one main rule should be remembered: it is prohibited to install any fittings in the area between the outlet pipe of the unit and the safety group and it is not allowed to connect other devices using a tee. The length of this section should be as short as possible; ideally, the devices are placed near the boiler itself. The photo below shows the entire set of listed violations:
When the group is placed on the supply line, you should choose a place so that the pressure gauge readings are clearly visible from the entrance to the boiler room. Sometimes this requires installing a security group on a vertical section of pipe or a special bracket attached to the wall. A hose (preferably transparent) should be connected to the outlet pipe of the safety valve and lowered into a plastic canister or sewer. The first option is good because you will always notice by the presence of water in the container when the boiler was operating in critical mode in your absence.
Conclusion
Despite the fact that security groups only need to be installed solid fuel boilers, it is possible, and even recommended, to be installed in all heating systems closed type. This will not lead to large costs, but it will create comfortable conditions for maintenance and will provide an additional layer of protection.
Safety group for heating: how it works and how to install it correctly
5 (100%) votes: 2Security group for heating is a special set of special elements that are used to provide complete protection of the heating system. It protects against accidents due to a strong increase in pressure levels or air leakage from the system.
Safety group for heating system
What does it consist of?
The heating system safety group consists of fuses. The equipment includes the following components:
Find out the price and buy heating equipment and related products you can find here. Write, call and come to one of the stores in your city. Delivery throughout the Russian Federation and CIS countries.
- safety valve;
- pressure gauge;
- consoles installed on one base;
- air vent.
The valve, consoles made on a single stand, the housing of the air exhaust device, and the pressure gauge fitting for connection are manufactured using hot forging and subsequently subjected to turning. These elements are made of brass.
The safety valve cover is at the same time made of durable nylon, which must be resistant to high temperatures. The pressure measuring device is made of ABS plastic, and its scale, made of light and strong aluminum alloy, is protected by acrylic glass.
It is worth mentioning how the safety group works in the heating system.
Components security groups
Security group assignment can be combined into three steps. Let's look at them in detail.
A pressure gauge is necessary so that you can easily determine the liquid pressure in the boiler tank and in the entire system. It is also useful when filling the pipeline network and adjusting the pressure in a closed heating system.
The air vent has a service purpose. Inside it has a chamber with a float, which is mechanically connected to the valve. The valve opens if there is no water. The function of the device is to remove air during operation, as well as when filling the radiator and system with liquid. The secondary function of the air vent is to release the first vapors that form in the boiler tank during excessive heating.
The safety valve is an emergency device that releases water and vapor if the specified pressure threshold becomes higher than normal.
Thus, the purpose of the safety group is to regulate and prevent emergency situations that may be associated with boiling of the coolant in the water jacket of the heat generator. The operating principle is as follows: initially the pressure gauge reacts to an increase in pressure, then the resulting steam escapes through air vent, and then water (or a mixture of steam and water) is discharged from the system by a safety valve.
The safety group with expansion tank performs important function in the heating system, in the absence of which the boiler shell would inevitably explode.
And so, if you do nothing, the relief valve will drain the liquid until the pressure is within the permitted limits. In many boiler installations, the upper pressure threshold is 3 bar. There are models with a maximum operating pressure of 1.6-2 Bar.
Is it always necessary to install a security group?
A heating system safety group is not always needed, however, if you want to be on the safe side, you can install it. For example, devices that operate by combustion natural gas or diesel fuel, from consumption electrical energy, does not require additional protection. Such units already have a high level of safety and can immediately stop and turn off the heating if the temperature or pressure rises.
Installing a safety group in a closed boiler system running on gas or from the mains power supply is often done simply for convenient maintenance and comfortable control.
Installation diagram of a safety group for a heating system with an expansion tank
At the same time, heat sources in the form of a solid fuel boiler have great inertia, so they cannot stop immediately. Even pellet boilers with automated system It takes a little time to burn the fuel that gets into the combustion zone. What happens to a firebox full of burning wood?
When the temperature in the shirt rises, the thermostat will instantly shut off the air, but the process will only be completed over time. The wood will not stop burning, but will smolder, causing the temperature of the liquid to rise another couple of degrees. Only a safety team will help prevent boiling and subsequent explosion. Therefore, in the boiler solid fuel it is a prerequisite.
Almost all manufacturing companies include security group included in the standard equipment kit for a solid fuel boiler.
Installation and connection of the security group to the heating system
Then, when the solid fuel boiler is not equipped with a group, it can be purchased separately or assembled with your own hands. It will only be important to choose the right devices for your boiler.
The technical characteristics of the automatic air vent are not particularly important, but here are the parameters pressure gauge and emergency valve are purchased according to the maximum operating pressure, which is specified in the technical data sheet of the unit.
Layout diagram of the safety group when piping a solid fuel boiler
Installing a security group in a heating system is not difficult. You can do this yourself using a regular set of tools and two options:
- The first method is to install it on the originally installed fitting that comes out of the heating boiler.
- The second method is to tap into the supply pipeline at the outlet of the unit.
Now let’s talk about how to properly install a heating safety group.
When installing the device, it is important to remember that in the area in the middle of the boiler outlet pipe and in a group you should not install various fittings. Also, you cannot connect other devices using a tee. The shorter the length of this section, the better. Most the best option– install the devices near the unit itself.
If the group is attached to the supply line, it is worth choosing a section so that the pressure gauge readings can be clearly seen from the entrance to the boiler. It happens that for this it is necessary to install a safety group on a section of pipe in a vertical position. Or a special bracket that is attached to the wall. You need to connect a hose (preferably colorless) to the outlet pipe of the safety valve and lower it into the sewer or a plastic canister. The advantage of the first method is that by the level of liquid in the container you can always track the critical operation of the boiler while you are away from home.
The heating safety group is an important part of the entire heating system. It must be installed in a solid fuel boiler, however, in other units (electricity, gas) the group will become an additional source of security. The security team is not expensive, but at the same time will be able to provide good conditions for operation and will create additional protection.
