A heating boiler is a device in which fuel is burned and a heat transfer fluid is heated. Heat still needs to be supplied to the water circuits of the radiators, underfloor heating, boiler, and others. Here you definitely need a circuit for tying a gas heating boiler - everything that connects it to appliances in the premises.
Purpose of the harness
- Maintaining a stable coolant pressure in the system.
- Removing air from the liquid that interferes with its circulation. With the formation of an air plug, the passage of water through this place stops. In the correct scheme, air vents are installed.
- Cleaning the coolant from contamination. Solids impair the performance of the equipment. In this regard, it is necessary to install filters for cleaning.
- Compensation for thermal expansion of the liquid. So that the liquid does not destroy the system with excess pressure, a tank is installed to compensate for the expansion.
- Connecting one or more circuits to the system.
- Accumulation of hot water when a boiler is connected.
The simplest circuit with one circuit
The simplest piping scheme for a gas heating boiler is made in accordance with its characteristics and requirements.
The piping also includes the connection of the gas supply to the burner.
Tying a gas heating boiler: diagram, photo
The simplest system with one circuit is designed in accordance with its characteristics and requirements. On the supply side install a check valve and ball valve.
A pump is installed on the return or discharge pipe to create a fluid circulation, which ensures uniform distribution of the coolant in the rooms. In front of it is connected a mesh filter, located downward by a sump. Before the liquid enters the boiler, it is advisable to install a fine filter.
Closer to the boiler, a closed expansion tank is installed. It contains a membrane that allows you to relieve excess pressure during thermal expansion of the liquid.
After the pump, the coolant flows through the circuit to the radiators. More modern is the isolation through the collector - a special water collector, from which liquid is distributed through several circuits. It is placed in a separate cabinet, from which the coolant is distributed through the pipelines.
The piping diagram of the gas heating boiler contains a safety valve. When the coolant boils from overheating, the expansion tank may not be able to cope with the pressure surge. The consequences may be as follows:
- ruptures of pipelines and leaks of connections;
- destruction of fittings and pipes;
- explosion of boiler capacity.
The safety valve is installed as close as possible to the boiler, because pressure begins to rise in it.
On some units, safety groups are established consisting of a relief valve, an automatic air vent, and a pressure gauge. Devices are mounted directly in the boiler water jacket, but can also be installed on pipelines. On gas and electric boilers, these devices can be replaced by others, where when the critical temperature is reached, the burner fluids or electric heaters are turned off.
There are many options for connecting heating equipment to boilers, but the classification is based on the division into natural and forced circulation.
Natural circulation
The principle of operation is based on reducing the specific gravity of water when heated. Hot liquid is forced cold up, passes through heating devices, gives up part of the heat and returns to the boiler for heating back.
Installation of inlet and outlet pipes is performed with a slope of at least 3 0 , so that natural circulation occurs and air accumulates in the system less.
With natural circulation, the piping of the gas heating boiler (diagram below) is made so that the radiators are located above the supply pipe.
The return goes from above also with a bias. With proper installation and selection of pipe diameters, natural circulation is almost as powerful as forced circulation.
The advantages of the method:
- simplicity of the system;
- ease of installation;
- silent operation;
- durability.
The system is suitable for heating a small house with a total floor area of not more than 100 m 2 . The disadvantages include the duration of the heating of the premises and the inability of temperature regulation in individual rooms.
The gravity scheme is used mainly in small houses and in the country, in the presence of only one heating circuit. Numerous pipes spoil the interior if they are not hidden in the walls.
Forced circulation
The method has received the greatest distribution, since the pump intensively pumps coolant through the system and the heating efficiency is increased by 30%.
The advantages also include the ability to control the temperature and low consumption of pipes during installation. The system will still cost much more, because it is more complicated and requires more devices. Installed elements require balancing, and the entire system requires regular maintenance. In addition, a source of electricity is needed.
If you install a combined system, it will combine the advantages of both of the previous ones. It can be switched to any mode using the bypass installed with the pump. In this case, the heating operation will not depend on the supply of electricity to the house.
Polypropylene strapping
Plastic pipes replaced metal everywhere, including water pipes. For heating use multilayer reinforced products that withstand high pressure. Thanks to the solder joints, a monolithic piping of the gas boiler for heating with polypropylene is obtained. Schemes are created of any complexity and in a short time.
Important! The simpler the heating system circuit, the more reliable it is, and the performance is higher.
Unlike the heat carrier, gas is connected to the boiler through a metal pipe with a paronite gasket. The seal is tight and does not burn.
Tying a floor gas heating boiler: diagram
The dimensions of a conventional floor boiler are small, but it requires a lot of space to install it together with the piping. All equipment, including a circulation pump, elbows, bushings, manifold, cranes and devices, is difficult to place compactly.
Most models are single-circuit, and hot water requires a boiler with all connections.
The hot water supply system requires a separate pump (in the absence of a central water supply), an expansion tank and a thermostatic mixer.
Gas must be correctly connected to the boiler. For this, design documentation is ordered, which is made up of specialists. Entering a gas pipe into the house is made in the presence of a shutdown device in the event of an emergency. Gas is connected by special services using special pipes, hoses and other equipment.
Wall mounted boiler
Boilers can be hung on the wall even in the kitchen. They take up little space. The piping of the wall-mounted gas heating boiler (diagram below) is included and can even be built into the boiler. The compact arrangement of the equipment requires less space, but such models are more difficult to maintain.
The disadvantage of wall-mounted boilers is their low power. In addition, the devices do not work without electricity, and the natural circulation of the coolant is rarely used for them. On the other hand, almost all boilers are already equipped with electronics and electricity is necessary for them. In places with unstable supply, you can put an uninterrupted power supply.
In most wall-mounted models, a double-circuit gas boiler for heating is provided, the scheme of which allows you to supply the house with hot water.
The disadvantage of the dual-circuit option is to turn off the heating while consuming hot water. This is especially noticeable when the boiler power is small. If it is enough, the temperature of the coolant in a couple of hours is reduced by only a few degrees. This applies to houses with high-quality thermal insulation and a sufficient number of radiators with thermal inertia.
Conclusion
The tying diagram of a gas heating boiler is made in accordance with its characteristics and requirements. A natural circulation system through one circuit is suitable for giving, and for a large house - with forced and multi-circuit.