Double-circuit boilers allow not only to heat the dwelling, but also provide it with hot water. These universal devices are popular due to their compact size and ease of operation. Before using such equipment, you should familiarize yourself with its device, connection features and basic connection diagrams.
Device
Double-circuit gas boilers incorporate several elements, among which should be highlighted:
- burner;
- circulation pump;
- combustion chamber;
- three-way valve;
- secondary heat exchanger;
- main heat exchanger;
- automatic appliances.
The burner is the main moduleheating device. It is located in the combustion chamber. The main function is the heating of the coolant and the release of thermal energy for hot water supply. To maintain the desired temperature, this element has an automatic combustion control system.
What is the pump for
A circulation pump is needed to create a forced movement of water inside the pipe. This node is also responsible for the efficiency of hot water supply. Compared to a fan, the pump is silent.
The burner is installed in the combustion chamber. It is either closed or open. Complemented by a fan that supplies air and removes smoke.
Thanks to the three-way valve, the boiler switches to the function of heating water for hot water supply. The secondary heat exchanger is responsible for heating the hot water. The main one is located on top of the burner and is located inside the combustion chamber. This guarantees the heating of the water that enters the hot water system and heating pipes.
Why do we need automation
Control of the parameters of the boiler is provided by automatic devices. They are necessary to monitor the level of heating of the coolant. This allows you to adjust the functioning of the burner. Automatic devices help to control various nodes, they fix emerging problems and support the flame.
In the lower part of the housing there is a space for the removal of heating communicationscircuit, cold pipeline and gas supply. A number of modifications of gas boilers are supplemented by paired heat exchangers, while the operation of a double-circuit boiler remains the same.
Connection diagram
The connection diagram for a double-circuit floor gas boiler is quite simple. You need to understand that such equipment is reliable, so for the entire period of operation it is unlikely that there will be a need to turn it off and repair it. From this we can conclude that the blocking taps are installed first. They are necessary for the maintenance of the heating system. It is unlikely that you will need to dismantle and cut off the heat generator.
How to extend the schema
After reviewing the technical data sheet of the product, you can see which system is used to connect double-circuit gas boilers. The scheme can be expanded by increasing the number of possible consumers.
1/2 inch taps fitted to gas, hot and cold water connections. 3/4 inch valves are installed on the coolant pipe. A third tap will be needed to recharge and empty the system. The fittings are installed by the Americans down. There should be mud collectors at the entrance from the heating network and water supply; they should be placed in a horizontal position so that cleaning is convenient. Spout should be pointing down.
Tank connection
Using the described scheme for connecting a gas double-circuit boiler, you will need to connect an external expansion tank to the return pipeline. For this, additional fittings are used, which will empty and cut off the containers. The make-up and drain pipe is installed at the lowest point of the system. If the boiler is wall-mounted, then the valves must be screwed on before hanging the equipment on the wall. When the handles or butterfly interfere with rotation, they should be removed by unscrewing the nut on the stem. The gas supply valve is installed through a dielectric gasket.
When antifreeze is used
If you fill the system with non-freezing coolant and want to be safe, it is better to use an alternative scheme for connecting a gas double-circuit boiler.
Two taps are installed on the "return" and "supply", which will allow the boiler to be dismantled and the system to be serviced without draining the antifreeze. Such a scheme can be used for two- or three-story houses, where there are water-heated floors and a radiator network. An additional expansion tank is indispensable here.
Power connection diagram
The rules for connecting electricity are very simple. You'll need line protection, and that's what grounding and a circuit breaker are for. If the furnace does not have powerful equipment like an electric boiler, then there is no need to run a separate cable to the switchboard.
When considering the connection diagram of a gas double-circuit boiler to electricity, you should pay attention to the switch. It must be located in a safe place where it will not fallwater or coolant in the event of a rush. It is important to ensure that there is a wire that will be connected to the ground loop. If the cord in the equipment set does not have a third core, the conductor must be connected to the steel casing of the heat generator. It is not recommended to use metal pipes if you are considering them as grounding conductors. Cables must be laid in a protective corrugated sleeve.
When studying the connection diagram of a gas double-circuit boiler, you must take into account that turbocharged European equipment is sensitive to the features of the phase connection. If you confuse the phase and neutral wires, the electronic control unit will not start the device. If the house is located in an area with unstable mains voltage, it is recommended to power the boiler through a stabilizer that protects the electronics from burnout. If interruptions often occur in the power supply system, then it is better to purchase and install an uninterruptible power supply, otherwise the house may be left without heat when it is turned off.
Installation features
Double-circuit heat generators running on natural gas can be divided into two subspecies. Such devices are non-volatile and require power supply. The latter should be connected to electricity and heating in the same way as wall types. Non-volatile floor units heat water for hot water supply with a copper coil or one that is made of stainless steel. It is built into the main heat exchanger. The complete set of the heater is minimal, there are:
- heat exchanger;
- security automation;
- burner.
For installation in this case, you need to purchase:
- security group;
- circulation pump;
- expansion tank.
The safety group must have a safety valve, the working pressure of which corresponds to this indicator in the passport. When choosing an expansion tank, you should prefer one with a volume equal to 10% of the total coolant. An open expansion tank will complement the connection diagram of a double-circuit gas boiler. The installation system of this equipment does not imply the presence of a safety group and a pump. When choosing pipes, you should purchase those with a diameter of at least 40 mm. Their laying is carried out with a slope of 5 mm per 1 linear meter of the line. The heater is located at the lowest point of the system. The open tank should be located at the highest point. If electricity is available, forced circulation can be arranged. The bypass pump is activated here.
Connection diagram with indirect heating boiler
This combination began to appear among those consumers who were not satisfied with the operation of the hot water circuit of the heat generator. This fact cannot be called surprising, because an average power device produces about 10 liters of water per minute, this volume is not sufficient to provide two consumers, for example, a shower cabin andsinks in the kitchen. The connection of a double-circuit gas boiler to heating can be carried out in conjunction with an additionally purchased indirect heating boiler. In this case, a flow simulation is created by the circulation pump, which starts and stops on a thermostat signal. Such a scheme may not work correctly.
The heating unit delivers water at a maximum temperature of 60 °C. It passes through the boiler coil without heating its contents to the same temperature, because the volume can reach 200 liters. Water with a temperature of 55 ° C instead of cold water enters the second circuit of the boiler from the boiler heat exchanger. It is heated by a burner, which is switched off by a sensor signal. Due to the flow, the switching on occurs again after a few seconds, which reduces the life of the heat generator. In this case, the boiler heats up longer than the required time, which depends on the power. The heating remains turned off, because the unit is engaged in the hot water circuit, while the house cools down.
Bacteria that live in warm water are breeding in the storage tank. It is removed by heating the boiler to the maximum temperature, but this is unrealistic to achieve. When connecting a double-circuit wall-mounted gas boiler, you must use the correct diagram. It will provide for loading an indirect heating boiler in 25 minutes. To do this, the hot water pipes are muffled, and this does not affect the resource of the heat generator.
Connecting a double-circuit gas boiler to the system is mandatoryinvolves connecting equipment to the supply of gas, heating, water, heating return and pipeline. The last step is to connect to the gas pipeline.
Connecting a double-circuit gas boiler to the heating system begins with the installation of a coarse filter, which prevents debris from clogging the device. This assembly is put on the pipeline branch pipe.
