Having an effective heating system is essential for maintaining a warm and comfortable home. A double-circuit gas boiler is a common choice for many homes. This multipurpose appliance is a convenient addition to any home because it not only heats but also produces hot water.
So what is the operation of a double-circuit gas boiler? It basically works on a straightforward but clever principle. The water for your taps and showers is heated by one circuit, and the water for your radiators or underfloor heating is heated by another. You can use a single unit to provide both hot water and central heating thanks to its dual functionality.
To guarantee efficiency and safety, double-circuit gas boiler installation needs to be done with great care. It is imperative that you adhere to all applicable regulations and follow the manufacturer’s instructions. In addition to ensuring peak performance, proper installation reduces the possibility of mishaps or malfunctions.
It’s important to comprehend a double-circuit gas boiler’s basic parts and overall design before beginning the installation process. With this understanding, you’ll be able to confidently navigate the installation and make sure everything is configured correctly. Every component that makes up the system, from the expansion vessel and safety valves to the burner and heat exchanger, is essential to its functioning.
Safety should always come first, whether you’re installing a new boiler or replacing an old one. It is strongly advised that the installation be done by a qualified professional to guarantee adherence to safety standards and laws. Furthermore, in order to keep your double-circuit gas boiler operating safely and smoothly for many years to come, routine servicing and maintenance are necessary.
- Double -circuit gas boiler: principle of operation
- Similarity with other designs
- The principle of operation of the gas boiler: heating scheme
- The principle of operation of a double -circuit gas boiler
- Work in hot water supply mode
- Double -circuit gas boiler
- Varieties of such boilers
- The design of a double -circuit device
- One of the leaders of popularity Lemax company. Description of the premium boiler 16n in
- Typical diagram of a double -circuit gas heating boiler
- The principle of operation of a double -circuit heating boiler with two heat exchangers
- The principle of operation of a double -circuit gas heating boiler with a beethermic heat exchanger
- Video on the topic
- The first launch of the boiler. Instructions for beginners.
Double -circuit gas boiler: principle of operation
As noted above, the device can operate in several modes. If a single-circuit boiler is intended only for heating the room, then the 2-circuit can also warm the water, but this has already been said. If you need to heat the room, then the principle of operation is as follows: the carrier, in our case, it is water, enters the heat exchanger, which heats it to a certain temperature. Today the range ranges in the region of 35-85 degrees Celsius. Thermostat launches heating mode automatically. This is done when the temperature in the system drops below normal. As a result, the circulation pump begins to work and supplies water from the heat exchanger (pre -warmed) to the system. The pressure in the system that should not fall below 0.5-0.7 bar is also taken into account. If necessary, the microprocessor sends a signal to the burner, which heats the carrier to the desired temperature.
Similarity with other designs
Even though a double-circuit wall-mounted gas boiler’s design is not simple, everything becomes clearer when you examine each component’s function in more detail. This kind of equipment is similar to a gas flow water heater because it has a burner and a heat exchanger. Every other detail is taken from a wall-type single-circuit boiler. A built-in strapping system that includes a circulation pump, security group, and expansion capacity plays a major positive role.
When examining the gas double-circuit boiler’s operating principle, it’s critical to remember that it should never be permitted to mix coolant and hydraulic system water. There is an additional pipe that is a part of the circuit that is used to pour the liquid into the heating system.
A specific amount of coolant is used, and it flows through the secondary heat exchanger to produce hot water.
The principle of operation of the gas boiler: heating scheme
The primary purpose of heating apparatus is to transfer thermal energy produced during the burning of a gaseous material directly to the coolant, thus heating it. For the purpose of clarity, the operation of a single-circuit device is taken into consideration below, which is unable to guarantee the heating of water for consumer needs.
GAZ enters a special camera where its fire occurs after exerting some pressure from the main network.
Ensuring the complete safety of this process is crucial. Many automation systems and sensors are used to regulate the combustion power.
There is a large release of heat when the flame appears. The heat exchanger, which houses the working fluid, is the direct conduit via which the heating system transmits it. The process of heating is done outside. A stream of burning gas affects the heat exchanger. This element can be made of steel, copper, or cast iron.
The principle of operation of a double -circuit gas boiler
We will now start dissecting the basic idea behind how a gas double-circuit boiler operates. We now know why each node and module exists, and this information will help us comprehend how all of this gear functions. We’ll examine the idea of work in two ways:
- In heating mode;
- In hot water generation mode.
Your home is heated by the boiler when it is in heating mode.
It is immediately apparent that operating in two modes is not possible. To address this, double-circuit boilers have a three-way valve that directs a portion of the coolant to the DOS circuit. First, let’s examine the principle of operation during the heating process. Next, we will investigate the operation of the technique in hot water supply mode.
A double-circuit boiler functions similarly to a standard flow heater when it is in the heating mode. When the burner is first turned on, it works for a while to raise the temperature in the heating circuit to a certain point. Upon reaching the required temperature range, the gas supply will be cut off. Should an air temperature sensor be installed within the residence, its readings will be considered by the automation.
In double-circuit boilers, a weather-dependent automation that regulates street air temperature may also have an impact on a gas burner’s performance.
The coolant, which is forcing the heating system into forced mode, is heated by the heat from the operating burner. In order to guarantee that water passes through the main heat exchanger normally, the three-way valve is in this position. There are two methods for removing combustion products: independently or with the use of a unique fan that is housed in the double-circuit boiler’s upper section. The state of the DHW system is disconnected.
Work in hot water supply mode
The hot water supply circuit initiates at the moment the tap crane handle is turned. The three-way valve, which shuts off the heating system, is activated by the emerging water current. A gas burner is lit simultaneously (assuming it was disconnected at the time). The tap starts to flow hot water after a short while.
The heating circuit is totally shut off when switching to the hot water supply mode.
Let’s examine how the hot water contour operates theoretically. As previously stated, its inclusion results in a DHW or heating system being disconnected—only one person is permitted to work here. regulates this three-way valve.
He directs a portion of the hot coolant toward the secondary heat exchanger; the secondary has no flame. The heat exchanger starts to heat the water passing through it when the coolant acts on it.
Due to the usage of a tiny coolant circulation circle, the scheme is a little bit complicated. Although there is no such thing as the best operating principle, double-circuit gas boilers with independent heat exchangers can claim regular maintenance. What characteristics distinguish boilers with integrated heat exchangers?
- A simpler structure;
- High probability of scale formation;
- Higher efficiency in DIA.
It is evident that the drawbacks and benefits are closely related, although distinct heat exchangers are valued more. Although the structure is a little intricate, this is not a scale.
Please be aware that the coolant flow along the heating circuit stops when the hot water is operating. That is, its continuous operation may cause the premises’ thermal balance to be violated.
The double-circuit boiler enters the expectation mode (or instantly turns on the heating of a slightly cooled coolant) as soon as the tap is closed, activating the three-way valve. The machinery will remain where it is until we open the crane once more in this mode. Depending on the boilers being used, certain models can perform as high as 15–17 l/min.
Once you have figured out the gas double-circuit boiler’s operating principle, you will be able to comprehend each node’s function and even independently comprehend repair issues. The device appears extremely complex at first glance, and its intricate internal design is cause for admiration—after all, the creators succeeded in creating nearly flawless heating apparatus. boilers with two circuits, like those made by Vaillant. They actively replace two devices at once by producing hot water and heating buildings for a variety of uses. Additionally, you can eliminate the need for a floor boiler and save space thanks to their compact design.
We delve into the operation of double-circuit gas boilers in our guide to effectively heating and insulating your home. These systems present a clever way to heat your room and supply hot water. We will explain the fundamentals of how they work and provide you with detailed installation instructions and instructions. Since ensuring a secure setup is of utmost importance, we’ll go over all the necessary precautions. Regardless of whether you’re thinking about replacing your heating system or you just want to know how it operates, this article simplifies the benefits and installation procedure of a double-circuit boiler into easily understandable terms.
Double -circuit gas boiler
You must comprehend the device of a gas double-circuit boiler in order to comprehend the basic principles of its operation. It is made up of numerous independent modules that switch to the dowry contour and heat the coolant in the heating circuit. You can rely on the equipment to operate without issue thanks to the coordinated efforts of all its parts. You can comprehend the working principle of a double-circuit boiler by being familiar with its mechanism.
Since all we need to know is the main nodes’ appointment, we won’t be considering the double-circuit boiler accurate to the screw device. Within the boiler, we shall discover:
The hot water’s contour and heating are controlled by two separate circuits in the model.
- A burner located in an open or closed combustion chamber is the heart of any heating boiler. It heats the coolant and generates heat for the operation of the dowry circuit. To ensure accurate support for a given temperature, it is endowed with a system of electronic flame modulation;
- Combustion chamber – it contains the above burner. It can be open or closed. In a closed combustion chamber (or rather, above it) we will find a fan that is responsible for air injection and for removing combustion products. It is he who is a source of quiet noise when the boiler is turned on;
- Circulation pump – provides forced circulation of the coolant through the heating system and when operating the DOS circuit. Unlike the combustion chamber fan, the pump is not a noise source and works as silently as possible;
- A three -way valve – it is this thing that is responsible for switching the system to the generation mode of hot water;
- The main heat exchanger – in the device of a double -circuit wall -mounted gas boiler, it is located above the burner, in the combustion chamber. Here, the coolant used in the heating circuit or in the hydraulic power plant to heating water occurs;
- Secondary heat exchanger – it is in it that hot water is prepared;
- Automation – it controls the parameters of the equipment, checks the temperature of the coolant and hot water, controls modulation, turns on and disconnects various nodes, controls the presence of flame, fixes errors and performs other useful functions.
Nozzles for connecting gas, hot and cold water pipes, and the heating system are located in the lower portion of the housings.
Double heat exchangers are used in some gas double-circuit boiler models. However, the fundamentals of work are essentially unchanged.
You’ll see that the gas column’s device is identical except for the lack of a heating circuit.
We discovered the mechanism of a wall-mounted, double-circuit gas boiler; at first glance, it appears a little confusing, but the challenges vanish if you comprehend the placement of specific nodes. The resemblance to a gas flow water heater, which still has a burner and heat exchanger, is evident here. Everything else is extracted from single-circuit wall-mounted boilers. The inclusion of an integrated binding, which consists of an expansion tank, a circulation pump, and a security group, is definitely advantageous.
When examining the setup and working principle of a gas double-circuit boiler, it is important to keep in mind that the coolant and water from the DHW contour are never combined. Through a different pipe that is connected to the heating system, the coolant is poured into the heating system. A portion of the coolant is circulating through the secondary heat exchanger, preparing hot water. But that is a topic for a bit later on.
Varieties of such boilers
Among the various models of these boilers, the following stand out:
- Protect. Suitable to ensure those who use at a time more than fourteen liters of water;
- Equipped with an additional boiler. Provide a large amount of hot water.
Additionally, it is standard practice to categorize double-circuit gas boilers into wall and floor models.
Wall boilers’ primary benefit is that they are far less expensive than flooring. Furthermore, installing these devices is fairly easy, which can reduce installation time. Such devices draw the attention of aesthetic connoisseurs and can be incorporated into nearly any interior space. Another undeniable benefit of wall boilers over flooring is their compactness.
The first thing to mention when discussing the benefits of floor options for boilers is their amazing power. Big houses can be heated by one of these gas boilers. Floor units don’t require an electrical connection, in contrast to wall-mounted units.
Additionally, because the heat exchangers in these devices are invariably composed of cast iron, which is impervious to corrosion, they are more robust. Different kinds of burners can be found in floor boilers. The atmospheric burner is the most widely used kind. Their simple design, nearly silent operation, and lower cost set them apart. Although fan burners are more potent than atmospheric burners, they are also far more expensive.
The design of a double -circuit device
The double-circuit gas boiler device (rice. 4) has three main nodes that are present in all variants of the device:
Additionally, the gas heating unit’s corpus, which has a layer of thermal insulation on it, is unaltered.
Rice. 4 a double-circuit gas boiler’s design
A gas burner is a structure that has nozzles inside and is perforated all the way around. Nozzles distribute and serve gas to create a consistent flame. There are various kinds of burners available:
- One -stage – this burner is arranged, so it cannot be adjusted, it works in the same mode;
- Two -stage – this device has 2 position adjustment positions;
- Modulated – the power of such a burner can be adjusted, due to this, boilers are more economical to consume fuel.
Exchanger of heat. Two heat exchangers are found in double-circuit gas devices.
- Primary – in it the coolant for the heating circuit is heated. Made of steel or cast iron;
- Secondary is a heat exchanger in which water is heated for a hot water supply contour. It usually affects the temperature slightly less than the primary, so it can be made of materials such as copper, stainless steel, etc.D.
The principal heat exchanger of a double-circuit gas device is rice.
An automation node manages how a gas device operates. It consists of a sensor network and an electronic circuit. The electronic circuit’s double-circuit boiler, which either switches the device’s operating mode or turns it off, is verified by sensors.
An apparatus required for a forced-circulation heating system is the circulation pump. This is a constituent element of a system that depends on energy. The appropriate pressure indicator is provided by such a pump.
The following options for the combustion system of combustion products:
- natural traction. In this case, combustion products are removed into a chimney, which should rise above the roof by at least 1 meter;
- forced traction. Boilers with such a system have a fan in the design for the output of combustion products into a coaxial chimney (pipe in the pipe). Such boilers are called turbocharged.
Tank expansion. When a теплоноситель reaches extremely high temperatures, it becomes unstable and eventually breaks down, resulting in a расширительный бак. Depending on the power of the boiler and the volume of coolant in the system, the tank’s capacity may vary.
The combustion chamber has the appearance of a thermally insulated metal container. The main heat exchanger is located above it, and a burner is located at the bottom. A gas device’s combustion chamber can be:
Since a gas double-circuit device with an open camera draws its combustion air directly from the room where it is installed, it may be energy-dependent. It is advised to install these units in boiler rooms, which are specially designated spaces. They must be set up in accordance with all the guidelines, which include having windows and adequate ventilation. Carbon dioxide will be released by a double-circuit boiler with an open combustion chamber that is low in air.
A gas double-circuit device with a closed camera is one that uses a coaxial chimney to draw air for combustion from the street. The unique design of the coaxial gases allocation system, or the "pipe in the pipe," serves as its foundation (rice, 6). In other words, a larger diameter pipe contains a smaller diameter pipe. Products that burn pass through a small pipe and a large air fence to enter a gas boiler. The coaxial chimney has the benefit of being able to be installed both vertically and horizontally.
Six pipes (a pipe inside a pipe) for a coaxial chimney of rice
One of the leaders of popularity Lemax company. Description of the premium boiler 16n in
One thing to consider when selecting equipment for hot water supply and heating is the Lemax models. The company’s premium 16n B should stand out among its other offerings.
The reasonable price of this gadget is around 25,000 rubles. The boiler is outfitted with a robust 2 mm steel casing. You are able to utilize the autonomous heating device’s equipment.
An enamel coating firmly guards against corrosion on the heat exchanger. Protecting against aggressive factors is what inhibitors do. The customer can connect equipment to liquefied gas with these double-circuit floor gas boilers for home heating. The smooth launch option is available for use. A temperature controller and thermometer make up the control panel. You can monitor the coolant’s heating temperature with the aid of the first.
The power of this device is 16 kW. The maximum amount of natural gas that can be used is 0.95 m3/h. 90°C is the heating temperature. These "Lemax" double-circuit boilers weigh sixty kilograms. They offer numerous benefits, such as:
- Ease of maintenance;
- improved security protection system;
- an increase in the primary and secondary air supply;
- compliance of the boiler with all the requirements of ecology and safety;
- the possibility of connecting the room thermometer, with which the consumer will have the opportunity to adjust the temperature of the unit, taking into account the temperature indoors.
Typical diagram of a double -circuit gas heating boiler
Examine a standard boiler schematic for a double-circuit gas heating boiler, such as the Saunier Duval Themaclassic F 30.
The classic F 30 boiler (scheme) by Saunier Duval
1. Fan. 2. Traction sensor – manostat. 3. Primary heat exchanger. 4. Temperature sensor (emergency). 5. Gas combustion chamber. 6. Expansion tank. 7. Flame control electrode. 8. Burner. 9. Harking electrode. 10.Circulation pump. eleven. The temperature sensor of the coolant. 12. Firing block. 13. Bypass. 14. Gas node. 15. Water pressure sensor in the heating system. 16. Heat exchanger. 17. Three-way valve. 18. DIS duct sensor. 19. DIS filter. 20. Water recharge device for heating systems. 21. Heating system safety valve. 22. The water drain of water. 23. Heating filter.
A: the water supply coming from the heating system. B stands for chilly water. C: The amount of water fed into the heating system. D is the GVS result. E-gas.
The principle of operation of a double -circuit heating boiler with two heat exchangers
Such processes take place in a double-circuit gas boiler when it is in the heating mode.
- Gas burner warms the primary heat exchanger,
- The heat exchanger transfers thermal energy to the circulating energy (due to the pump) in it the coolant
- The three -way valve is in a position that prevents the collection of the coolant into the secondary heat exchanger.
- The entire coolant “goes” into the heating system, gives energy there to the radiators and returns to the boiler through the reverse line.
The boiler’s heating mode operation schemes and the DIS
The operation of the hot water supply (DHW) system’s double-circuit gas boiler
- Gas burner, heats the primary heat exchanger,
- The heat exchanger transfers thermal energy to the circulating energy (due to the pump) in it the coolant
- The three -way valve is in a position that prevents the collection of the coolant into the outer contour of the heating system.
- The coolant circulates through the secondary heat exchanger, heating it.
- Water supply cold water, passing through the secondary heat exchanger, heats up and “leaves” into the hot water supply line.
Benefits of using independent heat exchangers in heating boilers:
- The primary heat exchanger is less subject to corrosion and the formation of plaque on it (scale), since the coolant circulates along the closed contour and does not constantly change its chemical composition.
- The secondary heat exchanger is more susceptible to the “attack” of “aggressive” tap water. Salt that are part of it clog it over time, and the heat exchanger fails.
Heating boilers with different heat exchangers have one drawback: they are more expensive than Bittermic boilers.
The principle of operation of a double -circuit gas heating boiler with a beethermic heat exchanger
Diagram of a dual-circuit boiler featuring a bittermic heat exchanger
The gas burner in the boiler heats the coolant in the outer circuit when it is operating in the hot water mode. And already, from it, hot water is flowing through the heat exchanger’s inner pipe.
Boilers with boutermic heat exchangers have the advantage of being less expensive than boilers with separate heat exchangers.
The heat exchanger’s "load" is increased due to the coolant and hot water heating, which is a drawback.
| Principle of Operation | Instructions and Scheme |
| A double-circuit gas boiler heats water for both heating and hot water purposes. It has two separate circuits – one for heating the house and another for providing hot water. | Installation of a double-circuit boiler requires careful adherence to safety requirements. Follow manufacturer instructions closely and ensure proper ventilation and gas connections. Refer to the provided scheme for correct installation. |
One of the most important steps toward providing your home with effective insulation and heating is installing a double-circuit gas boiler. Due to its dual purpose, it can supply hot water in addition to warmth, making it a flexible option for homes. It is essential to comprehend its operating principle for safe and appropriate installation.
The working principle of a double-circuit gas boiler is not too complicated. It is made up of two independent circuits: one for hot water supply for household use and the other for heating water for central heating. The boiler heats the water in the central heating circuit when the heating system is turned on, and the heated water is then distributed throughout the house via radiators or underfloor heating systems. In the meantime, the hot water circuit warms up water for showers and faucets, guaranteeing a steady supply of hot water all day.
A double-circuit gas boiler must be installed correctly to guarantee both efficiency and safety. Installing it should only be done by licensed experts who are knowledgeable about local laws and safety requirements. In order to prevent the accumulation of dangerous gases like carbon monoxide, the boiler must be connected to the gas supply, water supply, and heating system during the installation process. Appropriate ventilation must also be guaranteed. Furthermore, it is strongly advised to place a carbon monoxide detector close to the boiler to add an additional degree of security.
It is essential to adhere to all safety regulations during installation in order to avoid any potential risks. This include installing safety equipment like carbon monoxide detectors, making sure gas and water connections are tight, and providing adequate ventilation. Maintaining the boiler regularly is also necessary to keep it operating smoothly and effectively. This includes yearly maintenance performed by a certified specialist to look for problems and make sure every part is operating as it should.
In conclusion, if you want your home to have an effective hot water and heating system, installing a double-circuit gas boiler is a smart investment. You can guarantee safe and dependable operation for many years to come by comprehending its basic operating principle, adhering to safety regulations during installation, and performing routine maintenance. A double-circuit gas boiler can lower energy expenses while simultaneously providing warmth and comfort for your home with the right maintenance.
