Boiler with indirect heater connection. How to connect an indirectly heated boiler

Boiler connection indirect heating   gives many advantages, first of all it is, of course, unlimited volumes hot water. It is also important that he works immediately on several points of analysis. Therefore, in order to establish an uninterrupted supply of water, it is necessary to perform a simple strapping of the indirect heating boiler, this requires a minimum of means and effort, as well as a working connection diagram.

General principles of the indirect heating boiler

Using an indirect heating boiler and tying the boiler will significantly save on financial costs and ensure the supply of hot coolant to several sites at once. In order for the water to warm up evenly and quickly, it is important to correctly calculate the capacity of the indirect heater. To meet the need for hot water, an approximate volume of 500 liters per hour will require a tank designed for a volume of at least 100 liters. The volume of the tank should depend directly on.

The points serving as a heat-transfer device can be several in the harness, for example, a solid fuel boiler is best suited for heating water. Also, aggregates operating on solar energy, heat pumps   and geothermal systems.

Scheme using two pumps

The principle of operation of this circuit depends on the thermostat, which, when the temperature in the indirect heating boiler decreases, gives the command to the pump of the water heater, at this time the boiler pump switches off automatically, after reaching the desired temperature, the boiler pump is switched off, and the boiler pump is running again. With this scheme it is more convenient to use the unit equipped with automation, then the switching process and operation with the thermostat sensors will be clear and smooth.

In this case, the boiler passes the entire volume of the coolant through itself. To exclude entry into drinking water   dirt or industrial water, it is necessary to install check valves after the pumps.

Scheme with three-way valve

A circuit with a three-way valve can be applied for the unit with floor and wall mounting. The principle of the circuit assumes the presence of two circuits: one main heating circuit and an indirect heating boiler circuit, the latter has priority over the main one. At the same time, a safety group can be built into the boiler, this group includes: expansion tank   and a pump.

The principle of operation will be as follows: when the temperature is lowered, the boiler thermostat switches and switches three-way valve, after which the water moves along the boiler circuit. After reaching the required temperature, the valve is switched again, and the coolant circulates through the heating circuit.

Such a scheme is optimal with a wall boiler equipped with an automatic system, in this case and the operation of the three-way valve will be the boiler thermostat or boiler, at the signal from the boiler thermostat. In this case, the use of a single-circuit boiler with a boiler will provide an excellent supply of hot water, and this scheme is also suitable for those units in which the incoming cold water is "hard". When using a second circuit (hot water) will quickly break down.

Summary of Schemes

Such systems of connecting the water heater to the boiler exclude the simultaneous operation of heating water and heating the house. But the inconvenience it will cause only once, at the start of the system, as the coolant will be cold, the entire process will take from an hour to an hour, depending on the amount of coolant. If you work continuously to maintain the temperature, you will spend much less time, so there will be no temperature changes.

If hot water supply will be a priority in both cases, these schemes can be applied to more complex heating systems. For them, heating boilers are divided: one will work only for heating water, the other for heating.

Connecting boilers with a large number of circuits

In complex systems, three or more heating circuits are often involved. For such systems, the most optimal is the use of hydraulic arrows and distribution manifolds. The most is as follows:

• heating water circuit in the heater;
• the circuit of the "Warm Floor" system;
• heating circuit (battery).

To connect a hydraulic arrow or hydrocollector is used.. You can also use a separate hydraulic arrow and distribution manifolds. In another version, without the use of hydraulic arrows, the installation of balancing valves is necessary. If you neglect these devices, you will get strong differences between the circuits, and some of them will work inefficiently, the heat transfer can decrease several times.

With such a system, it is necessary to disconnect pumps of other circuits when the priority circuit is operating, otherwise the heating time can decently increase.

Not all cases in the house immediately it turns out to make connection necessary communications. In most cases, the DHW is carried out at the end of the repair or in the period when the cold season approaches. As a rule, for this system, often a boiler is installed   . But as you know, with constant operation this device consumes a large amount of electricity. And in order to make the water heating more economical we suggest you to understand how to connect it to the heating system. This will allow the water heater, during heating, to consume thermal energy   heating and only in summer to heat water with electric heaters. Let's compare different techniques.

Connection to a double-circuit boiler

In order to water heater   the heated water from the two-circuit heating system came in, a three-way tap is mounted. It switches the supply of coolant from the batteries to the water circuit coil. In such a scheme, it is important to ensure that the signal is applied to the three-way valve. Also, it is not necessary to install a coil on the coil circulation pump. The main work is done by the heating system, which contains this device. The recirculation pump is only necessary if the system includes a thermostat. As a consequence, when connecting a water heater to a two-circuit heating system, you can select equipment based on your needs.

To increase the hydraulic circulation capacity of the heating system, recirculation pump   . Due to this, it is possible to perform control / adjustment by thermal inertia, i.e. hydraulic friction heating.

There are boilers with a built-in boiler, both wall-mounted and floor-standing. Such equipment is more expensive, plus you can completely get rid of excess fittings. But on the other hand floor have built-in water heaters up to 100 liters. This imposes clear limitations. Moreover, such samples stand in the region of 60 thousand rubles. If to compare with the price of a water heater, then there is a significant difference, which varies within the limits of 4.5 thousand rubles. Considering this it is much more profitable to buy a device.

Let's compare several options for connecting an indirect heater:

• Using a three-way valve.
• Using the hydraulic arrow.
• The method of air circulation.

At the bottom of this method lies 2 circuits: heating from the boiler and heating. A three-way valve will distribute warm water between them. To control the valve is used automatic (thermostat). As soon as the water temperature in the heater circuit reaches the preset level, the automation will signal the three-way valve. After that, warm water enters the batteries. This method is considered the most popular.

If you set the limit temperature, it is important to consider to what extent the boiler warms up the water. Accordingly, the temperature in the water heater circuit should be set lower than in the connected device. Otherwise the coolant will be constantly sent to the water heater.

Pumps will send warm water to the different contoursi.e. the water heater is connected in parallel. Each pipeline is equipped with a pump, the operation of which is controlled by a thermal sensor.

A non-return valve is introduced into the system after each pump. This will prevent conflict between the two branches.

When DHW is switched on, the heating temporarily stops working. Given the fact that the water heater is heated in a short time, hot water in the radiators does not reach a critical temperature. If two boilers are used, the DHW heating and the heating operation will be uninterrupted.

When using circulating pumps, it is important that the flows are equal. To do this, you can use the hydraulic arrow and hydraulic distributors. This is especially effective if it is necessary that the warmed-up coolant be sent to floor heating, a boiler and radiators. To level the difference in pressure in the circuits, the parallel action of the hydraulic module with the hydrocollector. Although they can not be used, installing balancing cranes. But in this case, it will be difficult to mount and adjust the system without the help of a specialist.

This connection technique is only possible if there is a third input in the boiler. It will be possible to connect the recirculation of the coolant to it. Due to this, the process of heating water can be done very quickly. As a consequence, you get rid of the problem of draining cold water   with a tap until it goes hot. This is a significant saving.

As a result, a loop will be formed along which water will be constantly (forcibly) circulated. You will also need to connect the following items:

1. Expansion tank. With closed valves, a stable pressure will be maintained in the hot pipeline.
2. Safety valve. It will protect the water heater from pressure surges.
3. Automatic air vent before check valve. This will completely avoid the pumping of the pump before its direct start.
4. Check valve. If the system high pressure   and as a result the water overheats, the hot coolant will not enter the pipeline from the cold water. It is installed at the inlet to the water heater.

The maximum pressure that is allowed in the expansion tank is not allowed above the preset pressure in the safety valve.

So, we considered the main options for connecting an indirect heater. We highlight the pros and cons of this method:

Pluses:

• You can use several heaters at the same time.
• Possibility of recycling.
• The DHW and heating flows are separated.
• High performance.
• The electrical network is significantly unloaded during the heating period.
• The internal surface of the water heater has contact with running water.

Disadvantages:

• More expenses are required for the conversion of the heating system.
• The first heating of water takes more than one hour.
• It is necessary to have a separate room in which it will be possible to arrange all the equipment.

In this case, a circuit is used where two pumps are mounted. This will completely eliminate the use of a three-way valve. We have already described such a system, where the contours are parallel. As soon as the thermostat is signaled, the pumps leading to the tank are turned on. Also, a non-return valve must be installed that does not allow mixing of the coolant.

With this connection of the water heater, the recirculation method is also used. In this case, the heat carrier is continuously circulated by the pump. Thanks to this, the heated water enters the tap faster.

In this case it is allowed to have a system at the same time, which will allow the coolant to be dumped in emergency order and the possibility of connecting the hot water system. Often, thermostatic valves are mounted on batteries, but remember the risk of overheating. If a water heater is installed, there is no such problem, because The excess warm water will be sent to the tank. But remember that such a boiler connection is possible with natural circulation.

So, the following security group must be mounted:

• Shut-off valve.
• Drain cock.
• Shutoff valve and reverse.
• Pump on the water heater.
• Flow valve.
• Safety group of the water heater.
• Expansion tank.

In implementing installation works   it is important to avoid any mistakes. This can lead to unpleasant consequences. For example, it is important not only to take care of the close arrangement of the water heater to the boiler, but also to set the correct direction of the nozzles to the pipeline for easy installation. Another common mistake is the wrong connection of the pressure pipe and the coolant inlet. Cold water is always fed to the lower pipe, and hot water top   water heater. There is also a risk of incorrect connection of the pump. It is important to observe the parameters stated by the manufacturer.

So, we have considered with you the possible methods of connecting the water heater to heating system. We hope this information will be useful for you and help you to accomplish this task yourself. We also provide diagrams and video material for help.

Video

The principle of the indirect heating boiler is shown in the video:

Gas boilers with a boiler serve a little longer, in addition for the size of large cottages this option is preferable. This allows a little discharge of the circulation pump, and also reduces fluctuations in the water temperature. Any heat exchanger in a double-circuit boiler, however tight, is very limited in size. You can verify this by watching any training video. The area of ​​the heat exchanger of the boiler is simply gorgeous, it heats a huge tank (although there are exceptions), and not just flowing past the flow, as it happens in the boiler. As a result, the parameters of the boiler are much more stable. If, for example, two people have opened the faucets on which one boiler operates, then with a sharp overlap of water on one side, the second user can easily be burned by the inertia of the equipment. How to connect the boiler to the boiler in order to get all these benefits right into your house and not repent of the deed?

We connect the boiler to the heating system

To connect to the heating system of a private cottage, it is necessary to seat the boiler coil according to the recirculation scheme on one of the radiators, or splitters, for example, in the basement. You have heard that water intake always occurs downstream from the city, and the discharge is higher, on the contrary. In this case, everything must be done on the contrary, otherwise the system efficiency will decrease significantly. We take the water as close as possible to the boiler (which can stand even in the next room through the wall), but we dump it slightly further from the boiler so that a closed loop does not form. You, of course, heard that the recirculation pump should work to draw water into the boiler. This is so, if there is a thermostat that is embedded in the tank wall. In this case, the power phase of the recirculation pump first passes through the relay, and then only goes to the service drive.

For this, the installation of electrical network   At home we conduct a two-wire wire. But only before the recirculation pump. From him to the same thermostat is used already three-core:

1. Earth.


2. The phase going to the thermostat relay.


3. The phase that has returned to the recirculation pump motor.

1. Recirculating pumps with a timer operate in cycle mode. Temporary relays more often mechanical type   sets the periods of inactivity. As a result, the recirculation pump works without paying attention to the temperature in its own mode. For this purpose, the thermostat is naturally not needed, and such a scheme is often put on the recirculation of hot water supply.


2. Recirculating pumps of direct action simply work, paying no attention to anything, except for the presence of supply voltage. Obviously, such a scheme will not allow us to obtain the required 55-60 ºС, which are required for comfortable washing and proper boiler operation mode. So a recycling pump of this type does not suit us.


3. The recirculation pump with thermostat has its own inlet water temperature sensor. If you put such an output from the boiler in the heating circuit, then you can come up with something!
  (See also: )

Typically, the temperature in the heating circuit at the outlet from the boiler is about 65 - 70 ° C. This is necessary to fit into the regulations. For example, according to European standards, radiators should not be hotter than 60 ºС. While the water reaches the first battery, it will just cool down a little. If you immediately set the boiler at 60 ° C, then even the nearest radiator will not reach the norm, and the last in the circuit will be completely cold. This is not quite what you need in the winter. So, for hot water supply, the water must be at least 10 ° C colder than the heating circuit in the area from the boiler outlet. Given this fact, we can say that the temperature after passing through the coil flow will be the lower the cooler the water in the boiler. Given this simple relationship, you can deduce the regularity of setting the pump thermostat to this parameter so that you get the desired mode.

We believe that it is easiest to select the parameter experimentally. Once the temperature of the hot water is satisfied, you can finish setting up the equipment. Wherein gas boilers   Two-circuit with a boiler can be connected according to the same scheme. Get a very funny loop:

• the boiler thermostat controls the water at its outlet (read, enter the boiler);


• the thermostat of the recirculation pump measures the parameters at the boiler outlet.

It is clear that if the temperature of the heated towel dryer is slightly less than 55 ° C, no one will pay attention to this. If only it was warm. Hence the lower requirements for recirculation pumps. Usually a boiler, unlike a cheap water heater, has a separate outlet for draining water for a period of inactivity or technical operation. The path is usually planted directly into the sewage system. In this case it is necessary to take into account that there must be a course for penetration into the air. This can be achieved by simply blocking all the faucets, except for the faucet in the bathroom. Then the air will pass through all the pipes. But usually at the top of the boiler put the crane Mayevsky, if the design allows. This greatly simplifies the maintenance process.

An important link is pumping in a boiler of fresh cold water. The path is planted near the bottom and is supplied with an emergency drain valve. It is important to add to the system an expansion tank, which is also sometimes called a hydro accumulator. It has an elastic membrane above which air is at a pressure of just under 3 bar (assuming that the pressure in the water supply system is 3 bar). As a result, when the water topping pump starts working, the entire pressure jump is extinguished. In addition, the accumulator stores a certain volume, so that electrical equipment can be switched on less often.

Connecting the boiler to a double-circuit boiler

It is worth adding that the boiler for solid fuel boiler is no different from the others. Actually, the coil does not care where it takes water from. In addition, all recirculation pumps are separated from the housing by check valves for convenience. To be able to maintain the system without draining the water and losing energy on it. This is why recirculation pumps are more convenient to put on retraction, and not vice versa. Otherwise, the check valves will not be cut already. This fineness, which is especially important for the coil recirculation loop. That's why we reluctantly discussed the scheme above, when there is no separate boiler thermostat and we have to put a recirculation pump with a sensor on the hood.

Distinguish gas boilers with a boiler floor and gas boilers with a boiler wall, which of them give the advantage, depends largely on the availability of free space. If the basement floor is damp, it's better to hang on higher equipment. Boilers with a built-in boiler are more expensive, but there is no trouble with the installation of the fittings. At the same time, their capacity is not so great that it imposes some limitations. Floor boilers   with a built-in boiler can have a volume of up to 100 liters. For an individual tank it's just ridiculous! Finally, gas boilers with a built-in boiler are very expensive. 60,000 rubles against 4500 conventional water heater. There is something to think about. Well, how here not to remember that double-circuit boilers   called the choice of the poor.

This is all we wanted to talk about the scheme of connecting the boiler to the heating boiler. Unless it was possible to stop at the valves a little more.

Use of materials is allowed only if there is an indexed link to the page with the material.

The boiler's own heat exchanger capacity is often insufficient to meet the domestic hot water demand. To make up for the shortage, an indirect heating boiler is used.

When the water in the tank cools down after a temperature regulator signal, the valve switches to the flow. After warming up to the set-up temperature, it returns to the place, the flow is blocked, then the water is coming   to the instruments.

The scheme of connection of a single-circuit boiler with an indirect heating boiler with a three-way valve is similar. When designing the system it is necessary to take into account: the temperature in the heat exchanger of the boiler must be higher than the tuning in the boiler. Otherwise, the boiler will continue to heat even when the boiler is off.

Connection of a double-circuit boiler to an indirect heating boiler through two circulation pumps: each circuit has its own pump. With this system, the heating of the water for DHW and for heating is carried out simultaneously, and they can be switched off separately. The operation of both pumps is controlled by a thermostat. To ensure that the flows are not mixed, a check valve is installed behind each pump.

The scheme of a single-circuit boiler with an indirect heating boiler with a distributive hydro-gun (with a hydrocollector) is used if there are more than one heating circuit, incl. when they are different (radiators and warm floor). The same version is suitable for installation of dual-circuit units together with boilers.

Diagram of a two-circuit gas boiler   and a boiler.

  1) Boiler heating (loading) pump.
  2) Temperature sensor - thermostat.

Connection Features

How to connect an indirect heating boiler to a single-circuit boiler:

1. Find a place for the tank as close as possible to the boiler.
2. Connect the input (top) and the output (bottom) in series.
3. Connect the pump. The axis should be located in a horizontal plane, deviation from the horizontal will lead to a rapid wear of the bearing.

The pump is equipped with filters. During operation, they should be periodically checked and cleaned.

The scheme of connection of a single-circuit gas boiler and an indirect heating boiler.

How to connect an indirect heating boiler to a two-circuit boiler, the scheme with a three-way valve: the valve is installed at the outlet of the boiler, from which the contour branches. One branch goes to the heating circuit, the second to the boiler. The return from the boiler is the same, the pump can also be shared.

Priority in this case is the supply to the boiler. When the coolant reaches the tuning temperature in it, the thermostat feeds the three-way signal for switching. From this point on, the hot water is only supplied to the heating circuit.

Video about connecting the boiler to the gas boiler.

A private house, country cottage or any other accommodation can be made comfortable and cozy. First of all, this requires communication - heating and hot water. And now, for this, you do not need to buy expensive powerful units and equip an entire boiler room. A compact gas heating boiler, connected with an indirect heating boiler, will cope with the task set. The harness can be made both at the time of installation of the boiler and after, when the need arises.

Indirect Heated Boiler and his choice

The boiler is a container for the coolant   - water, with a heating element built into it. The water heater works on the principle of a drive: the water in it is constantly, and the sensors monitor its temperature. differs from direct heating boilers primarily in that it can not operate autonomously. The boiler is not connected to electricity and has no burners or furnaces. To heat water it needs a boiler. The selection of the heating boiler and the indirect heating boiler must be thought through to the smallest detail.

Must be combined and correctly selected for capacity. If the boiler's output is less than the boiler's capacity, a significant over-expenditure of electricity will be obtained, since it takes a lot of time to warm up the water. It is also important to consider that the boiler will also work to maintain the temperature, which will also affect the boiler's wear and energy consumption. Most the best option, when the heating of water consumes no more than 50 percent of the energy spent by the boiler for heating.

When choosing it is important to check whether the sizes and types of connectors are suitable for making the strapping. Normally, standard connectors are made, but if the manufacturers are different, you need to be extremely careful, otherwise the thermal sensor, which is connected in 2 ways to the boiler or to the module, may not work correctly or not connect at all.

Gas boiler with a boiler is better to choose one manufacturer, this will save you from a lot of hidden problems that you can only learn about when you connect. If the work is carried out with your own hands, it is important to follow the scheme of the strapping at each stage. One option is to consider a gas boiler with a built-in boiler: these units are slightly larger in size, but easier to install.

Also it is important to remember the auxiliary equipment, the most important is the circular pump. The pump will "drive" the heating medium through the heating system forcibly, so the temperature will be even and the pipes will be less likely to occur air congestion. The electric pump is also convenient for rapid warming up of premises.

Constructions of heating boilers allow you to choose two versions - floor and wall. By power, they can not yield to each other, so the choice depends only on the owner's preferences. Wall mounted units   look compact, they do not occupy useful space. The wall-mounted boiler is a little "richer", it already has a pump and an expansion tank. can also have a flow or storage type of heating of the coolant.

Installation

The device of the indirect heating boiler is simple, it comprises heating element   in the form of a coil, protective electrode, insulation, and all this is enclosed in a metal case. For the strapping, it is necessary, following the diagram, to connect the boiler to the circulation pump. Connection sequence: hot water outlet, circulation circuit, circulation pump, check valve, discharge to sewer, safety valve, valve, flow control valve, gauge manhole check valve, emptying the system, connection to the water supply system, expansion tank of the circuit.

When connecting, it is important to remember:

• connection of cold water should be from the bottom of the boiler;
• the hot water outlet is produced from the top of the tank;
• the recirculation point should always be in the center of the boiler.

The boiler can be connected to the boiler using several schemes: use a three-way valve, a hydraulic arrow, or use two pumps at once.

How to connect the boiler to the boiler using two pumps at once and is it profitable? All three connection schemes have a place to be, and the connection features for all are different. The scheme, which involves two pumps at once, differs only in that it is convenient when all the circuits are arranged in parallel; In the scheme also the use of a non-return valve is used. The valve prevents the mixing of coolant flows. Thus, it turns out that each pump of indirect heating and the boiler operates its pump, the water circulation is faster and better. The pumps are controlled via a temperature sensor located on the storage device. It is important to remember that the heating circuit is not the main one!

If the floor or wall heat-generating unit is properly selected and installed, heat and coziness must come into the house.