Connection of a safety group for an indirect heating boiler. Safety groups for indirect heating boilers from various companies

When installing a boiler in a residential building, great attention must be paid to the safety of its use. It is important to remember that this device contains a significant volume of water with a very high temperature... So that the walls of the boiler are not unduly affected high pressure, as a result of which the heated water will flow out of the device, in such equipment special parts are provided, called a safety group.

Appointment

The main function of the safety group for water heaters is to ensure the required pressure in the system and control it. Thanks to such equipment, it is possible to urgently relieve pressure when it exceeds the maximum allowable parameters.

Composition

The elements of the water heater safety group include:

• Overpressure valve, also called safety valve.
• A non-return valve that prevents water from returning from the boiler to the water supply system.
• Shut-off (shut-off) valve.
• Adapter through which flexible hoses are connected.

These components can be installed separately or presented as assembled in one housing.

In large boilers, a hydraulic accumulator can be installed.

Views

When buying a safety group for a boiler, you can choose among the following options:

• OSO equipment. The OSO KV kit, designed for pressures up to 9 bar, includes a special shut-off valve and a special redundant valve that performs the function of a non-return and safety valve. The OSO BS kit includes a valve that acts as a thermo-mixing and non-return device. Hot water is discharged from a pipe located at the top of the equipment. Such a safety group can be installed in the case of using several boilers at once.
• Watts equipment. Designed for a pressure of 7 atmospheres, in the complete set has a guide for draining. The advantages of these security groups are high reliability, good quality and affordable cost.
• SYR hardware. Such equipment is designed for a pressure of 6-10 bar, depending on the model. The SYR 330 DN kit is able to withstand temperatures up to + 95 ° C. The SYR 24 DN and SYR 25 DN kits are class 1 acoustic and include a water backflow prevention system, safety valve and shut-off valve, as well as a pressure reducer and an expandable drain. The equipment is made of pressed brass.

• SDM GB kit. This safety group optimally protects closed-type heaters. Check valve, safety valve and shut-off valve are contained in a single compact body. The kit can be installed on a heater with a volume of 200 to 3000 liters. It is able to effectively protect the boiler against hydraulic overload, maintaining a pressure of 6-10 bar.
• ACV 10800102 kit. Its use speeds up the installation and start-up of the boiler, since this kit contains not only a safety group, but also a special mixing valve, as well as other specialized parts for installing the heater.

Application

The safety valve must be installed on any storage water heater, and if there is no safety group on the device, this immediately voids the device's warranty. When the valve is activated, it causes a small amount of water to be released, which reduces the pressure in the system. Valve response pressure settings are usually fixed and set by the manufacturer. They also have a manual pressure relief option.

Installation and assembly

When choosing a safety group suitable for your boiler, it is important to take into account the pressure for which its safety valve is designed. To effectively protect the apparatus from overfilling with water, the safety group is mounted on the inlet pipe through which cold water is supplied. In this case, the parts should be installed so that the coolant moves in the direction indicated by the arrow on the body of the safety group.

In the following video you can see how to assemble a Vaillant boiler safety valve you just bought from the store.

Safety regulations

• It is important to remember that the parts of the safety group get hot, so there is always a risk of burns on contact with them.
• Regular maintenance of such equipment is recommended, which is carried out in conjunction with the maintenance of the boiler.

Both the installation and maintenance of the security team should be handled by experts.

Boiler indirect heating is designed to provide a private house, summer cottage, enterprises with a sufficient amount of water. The principle of operation of the boiler is simple, but the efficiency of this device depends on how correctly the indirect heating boiler is connected to the boiler.

An indirect heating boiler is purchased for operation with a single-circuit boiler. Together, this equipment will take up more space than a double-circuit boiler.. In families with two or more household members, instantaneous heating systems will be ineffective, optimal solution- indirect boiler heating.

The capacity of the boilers varies from 80 liters to several cubic meters. There are recommendations for selection of boiler displacement ... For two people, this is the minimum tank capable of serving two draw-off points at the same time. For three people, a three-point water tank is required. For four - this is 120 liters, and for five - 150 liters, etc. If in the house they often wash in the bathtub, then a tank with a displacement of 120 liters is purchased. It should be borne in mind that these figures are average, since the need for hot water is very individual.

Internal structure of the boiler indirect heating is quite simple - the household water is heated by the coolant from the heating system passing through in a tank with heated water.

It is preferable to purchase boilers with a stainless steel tank (to ensure durability). Some characteristics are shown in the table below:

where, d is the difference between entering and reaching temperatures. These characteristics can only be achieved when the boiler power input is not less than the indicated power of the boiler heat exchanger! It should also be noted that the temperature of the incoming water in winter and summer will differ (from + 5C to + 15C).

There are also boilers with a system that have a function of self-cleaning from scale. It is provided by the shape of the inner tank in the form of a corrugation.

The characteristics of such boilers are shown in the following table:

As already mentioned above, the given characteristics directly depend on the power of the boiler itself. Thermal power the boiler should not be lower than the boiler capacity, otherwise the amount of heated water will be less than the declared one. And if the boiler's capacity exceeds the boiler's capacity, then the amount of heated water will be the maximum possible, based on the capacity of the boiler itself. For example, if you purchased a 31 kW boiler and you need a 100 liter boiler, then best buy in this case, there will be a boiler with a coil, because the capacities of these units are ideally matched for the best performance - 30 and 31. A boiler with a 23 kW tank-in-tank system will not be able to master the entire boiler power and the characteristics it produces will be less than in the first case. If you bought a 24 kW boiler, then in this case it is better to take a boiler with a "tank in a tank" system, since in this case the maximum DHW performance is achieved, and the boiler with a coil will have power losses.

Most engineers consider that tank-in-tank boilers are preferable. Due to self-cleaning, durability is achieved, and due to internal device increased heat transfer area, which achieves increased performance. Therefore, in most cases such boilers are preferable. Although simple ones are considered cheaper in cost. And in general, if you chose a simple boiler, this is not at all bad.

The following diagram shows the approximate location of shut-off valves and protective devices against connecting an indirect heating boiler To floor boiler, adapted for its connection - with the ability to control pumps. These are mainly volatile boilers of foreign production.

When connecting an indirect heating boiler to a non-volatile boiler, such as domestic AOGV or KSG, the boiler pump is controlled from the boiler thermostat. At the same time, it should be noted that the water heating rate is significantly reduced, since the boiler power is distributed between the heating circuit and the boiler.

In front of the boiler at the entrance cold water required installation safety relief valve 6 - 8 bar, depending on the characteristics of the boiler (example in the photo below. Shown here is a relief valve with a check valve assembly).

Boiler safety group Watts 3/4 7 bar (10004611)

Everyone knows that when hot water is turned on, it goes cold from the tap for some time. This problem is solved by installing bezo groups boiler hazard with an additional weak pump. Many manufacturers offer these pumps. The following diagram shows an example of a recirculation line installation:

Please note that the above diagram is applicable to boilers equipped with a recirculation outlet. If there is no such way out, then the circuit will look like this:

Here we see the recirculation line cutting into cold water after the check valve and safety group. On it, after the pump, another one crashes into check valve to prevent cold water from entering the recirculation.

In general, when connecting an indirect heating boiler for hot water supply in a house, we will get the same comfort as in a city apartment with central water supply with an advantageous difference in its cleanliness. Such water can be used for food purposes, even poured into a kettle without harm to health.

To secure the house the required amount hot water, an additional device is used - an indirect heating boiler (BKN). Its use can be considered one of the most rational and economically justified.

We will try to find out which piping scheme for the indirect heating boiler is most effective and how to connect the equipment in order to avoid common mistakes.

Before buying and connecting a buffer tank-accumulator (as it is also called BKN), you should understand design features the most popular types. The fact is that there are many types of equipment, including combined models that operate on heating systems and alternative sources energy at the same time.

We will look at traditional coil boilers using hot water as a heater.

Design features and principle of operation

What does indirect heating mean? Directly heated devices operate by being connected to electricity or gas burner, BKN has a different heat source. The water is heated by connecting to the hot water supply, that is, it turns out that the source is the coolant - hot water(or its substitute).

Outwardly, the BKN resembles a standard water heater - that is, it has a barrel-shaped shape, although modern models more ergonomic. For ease of use and installation, they are given a rectangular configuration.

If we consider new models famous brands, then you can see that gas boilers and often have the same design. They are mounted side by side or one below the other - this way you can save on space.

The main element performing the heating function is a steel or brass heat exchanger (coil) with large area surface, which is located inside the metal, coated protective layer enamel tank. So that the water does not cool too quickly, with outside the body is surrounded by a layer of thermal insulation, and some models also by a casing.

Schemes and rules for connecting BKN

The connection diagram and installation features of the indirect heating boiler depend on the class of the device and. It is necessary to choose the right installation site, focusing on the location of the boiler, the pump connection and the existing wiring. Let's try to figure out what needs to be considered when installing heating equipment.

Option # 1 - piping with a three-way valve

This is one of the most popular schemes, since it is used in parallel connection. heating system and BKN equipped with shut-off valves. The boiler must be installed near the boiler, cut into the feed circulation pump followed by a three-way valve.

This scheme is successfully used if several heating devices are used, for example, two different boilers.

2016-12-25 Evgeny Fomenko

Security kits for different companies

The safety group for the Valliant indirect heating boiler consists of the following parts:

• Check valve.
• Two shut-off valves, before and after the check valve.
• Overpressure valve.
• Connection for pressure gauge.
• Drainer.

It is connected to the cold water supply. It is used for indirect heaters of the Vaillant VED H 27/7 INT, VIR 150/5, uniSTOR VIH R 120 type (read how to connect a temperature sensor to a Vaillant boiler). If the pressure in the water supply is less than 5 bar, use art. -No. 473, if the pressure is more than 5 bar - art. -№474.

If the water is too dirty, a filter must be installed in front of it. For Buderus water heaters, the SG 160S safety group is used, which is usually supplied with the water heater.

It includes a number of details:

• Body with check valves.
• Drain adapter.
• Shut-off and replaceable non-return valve.
• Safety valve.

The body and connections are made of decontamination-resistant brass. Can be installed both horizontally and vertically. When choosing an installation site, you need to leave free access to the units of the device.

It is used with the following models: Buderus Logalux SM-200/5, SU200 / 5, SMH 400/5 W. Watts manufactures fittings and accessories for boilers and water heaters.

The Watts hardware kit consists of several elements:

• Automatic air vent.
• Pressure gauge.
• Safety valve.
• Shut-off ball valve with 90 degree closing-opening travel.
• Anti-splash water guide.

The units are mounted on a steel console. Installed vertically above the boiler. The design is quite compact, made in a brass body. It is recommended to rotate the knob once a month safety valve counterclockwise to flush it. Withstands water temperatures up to 120 degrees. Suitable for Baxi boilers. It is considered one of the most reliable manufacturers.

The Proterm set consists of a manometer with an aluminum dial with a range working temperature from -30 to 120 degrees, air vent and safety valve. Shows this pressure in the system and, if necessary, drains excess fluid. When installing, take into account the direction of flow of the water flow, which is shown by the arrow.

The ACV kit, in addition to the safety group, contains a dedicated mixing valve and expansion tank... Suitable for water heaters manufactured by Smart. If you decide to change or adjust something, it is important to remember that the water leaving the device is hot and there is a risk of burns.

The Meibes equipment additionally includes a decorative drain funnel, an 8 bar Meibes ME 6915B.80 PE safety valve and a regulating throttle. Suitable for devices with a volume of up to 200 liters. The installation should be carried out by specialists.

If there are several boilers in the system, OSO equipment will do. Calculated for high blood pressure and having an additional redundant valve.

Appointment

When heated, the water in the indirect heating device expands and puts pressure on the walls of the tank. To prevent destruction and rupture, a safety group is installed. It allows you to control the pressure inside the tank and, if necessary, drain excess water.

When the water pressure reaches a certain limit value, which depends on the settings, the shutter opens and the water is automatically drained, reducing the pressure. It also protects against rupture of the case in case of a breakdown of the temperature sensor and heating the water too much.

If you do not install a safety group, in the event of a heater breakdown, the company may deny you warranty obligations. It is usually supplied with the boiler, but you can also buy it separately. The price for it varies from 700 to 4000 rubles, depending on the parameters of the device and reliability.

In the event of an emergency increase in gas or water pressure, a safety group is used to protect the heating system. Anyone who wants to protect their boiler or water heater from premature failure should buy a safety group for heating. It is a combination of three devices - a pressure gauge, a safety valve and an air vent. A pressure gauge is needed to control the pressure level in the system - the red arrow indicates a division corresponding to 3 atmospheres as maximum level pressure. An air vent should be located at the highest point, which eliminates excess air in the system. Finally, the function of the safety valve in the safety group is to prevent overpressure if the expansion vessel fails.

Safety groups for boilers require correct installation, otherwise ill-considered actions will lead to failure of the heating system. The safety group is installed on the supply in such a way that the shut-off valve is behind it. If this closed system heating, it is necessary to arrange the safety group so that if one of the three elements fails, it could be easily replaced.

Boiler safety groups 3/4

Boiler safety group 3/4 made of brass- one of the most common and purchased. In our catalog you will find safety groups with other connection diameters - 1, 1/2. The safety group for the boiler is installed at the cold water inlet in the direction indicated on the body. Any boiler has a parameter such as operating pressure, which depends on the pressure in the entire pipeline system. When heated, this pressure can increase by several atmospheres, and excess water will press on the walls of the boiler. The safety group monitors the pressure in the boiler so that it does not rise above the norm.

Buy security group for heating - prices

The price for a safety group for a heating system is quite affordable, and it is also pleasantly combined with the impeccable quality of the product. A compact combination of a pressure gauge, a safety valve and an air vent is available to everyone and is necessary, especially if you use a boiler with a volume of more than 50 liters. To select and buy a safety group for a boiler, contact our specialists at the phone number indicated on the website.

All information on security groups - price, models and much more can also be found on the website.