Connecting a gas boiler should be taken seriously. However, such work is usually not accompanied by difficulties, the main thing is to follow safety rules so that the operation of heating equipment is not accompanied by risk. The simplicity of the work is due to the fact that some of the main piping units are included in the gas device, among them should be highlighted:
- expansion tank;
- pump;
- security group.
If we compare a gas boiler with a solid fuel one, then for the latter you will need to purchase the listed nodes, bring them into the house and connect.
Work algorithm
Before tying the boiler, the room must be prepared. The next step is to connect the chimney. If it is coaxial, then it is installed before installing the heating equipment in its place. At the next stage, you will need to prepare the harness and connect the device, only after that you can start connecting the gas pipeline.
Installation features and basic requirements
Before starting work, you must choose a gas boiler connection scheme. If floor equipment is to be installed, then before starting it is necessary to check the base for strength, if necessary, strengthen it. When a wall-mounted appliance is connected, its installation should take place after creating a chimney, fixing the bracket and hanging the device itself.
The chimney can be classic or coaxial. In the first case, we are talking about devices that are suitable for natural draft boilers. The second type of chimney is designed for forced draft equipment. Classic chimneys are made of metal steel pipes, which are additionally insulated. Coaxial chimneys are assembled from pipes that are part of the boiler kit. Such devices are immediately connected to the heating unit.
Regardless of the gas boiler connection scheme, you must comply with some requirements. Among others, it should be noted:
- the presence of a gas sensor;
- keeping the distance between the boiler and the walls;
- presence of a boiler room with outdoor equipment;
- the presence of a layer of material between the wall / floor, as well as the heating unit.
Security requirements
If you purchased a floor standing boiler,then it should be placed in a boiler room with a volume of more than 15 m3. The room must have a separate entrance, inside there must be a window with an area of 0.45 m2. It is important to ensure ventilation. There must be a gas detector in the room.
The layer of material between the floor and the wall, as well as the boiler, must be non-combustible. The nearest gas appliances are located 20 cm away. A distance of 30 cm or more should be maintained between adjacent walls and the boiler.
Features of traditional schemes
The scheme for connecting a gas boiler in a private house may not provide for compliance with some of the rules that will be listed below. They are not mandatory, but can extend the life of the boiler and facilitate system maintenance. Shut-off ball valves should be installed on the water pipes of the equipment. The water purification filter can be installed on the pipe through which the chilled water flows. This keeps the heat exchanger free of contamination. After all, substances that can contribute to this come from the heating system. A similar filter is also installed on the cold water pipe on the 2nd circuit.
Sometimes the scheme for connecting a gas boiler in a house involves the installation of shut-off ball valves on both sides of the filters, which makes it easier to clean them. The piping may include the presence of a chemical water softener, which reduces hardness and eliminates the formation of scale in the heat exchanger. It can be placed on the return pipe.
When connecting equipment toheating mains, you can use detachable threaded couplings and the same pipes that form the basis of the heating network. The first ones are necessary if there is a need to dismantle the boiler. Thanks to this, the integrity of the pipes will not have to be violated. The heating system has a lower circuit, on which a valve for draining water from the heating equipment is installed. Thanks to this, all the water will not have to be drained from the network.
Any scheme for connecting a gas boiler to heating requires a valve to drain the water. It is located on the lower contour of the network. A make-up pipe must be connected to the water supply line to the system. This will not allow the cold coolant to enter the hot heat exchanger. The rule must be followed for classic gas boilers.
If there is a condensing device, it is better to connect the connection to the processing line. A shut-off valve between the safety group and the boiler must not be installed. This requirement makes sense if the node is part of a device.
Correct wiring diagrams
The simplest way to connect a gas heating boiler is to directly connect the device to the heating system. The supply and return lines of the heating system are connected to the branch pipes of the unit. The above nuances should be observed. This scheme is suitable for simple heating systems. Usually they are in apartments and small private houses. Such a scheme is only suitable when a boiler with a safety group is used,expansion tank and circulation pump.
If the heating system is quite complex and involves the presence of high- and low-temperature elements, for consistency in the movement of water in the house, the circuit should be supplemented with a hydraulic separator. Among the items mentioned, towel warmers, underfloor heating, and radiators should be highlighted.
The separator is needed to smooth out the influence of some contours on others. Such a gas boiler connection scheme is suitable if the house has a separate circulation pump on the heating system circuits. At the same time, a pump is turned on in the warm floor, and an additional pump in the distribution of radiators and pipes.
Scheme with additional heat exchanger
If you want to waterproof some circuits of the system, you can use the scheme mentioned in the subheading. Such a need arises when using different coolants in the circuits. This indicates that water can move in one circuit, and antifreeze in the other. In this case, the gas boiler connection diagram will look like this:
- heat exchanger;
- boiler;
- Heating circuits;
- security elements;
- drain valve;
- recharge valve on each circuit.
Heat exchanger is a heat accumulator with three or more coils. Water heated in the heating equipment will go one by one, different heat carriers will go along the others. From the first coil, heat will be transferred through the water in which theother coils.
Having an additional heat exchanger has the benefit of being able to combine closed and open systems. The latter is the safest for the operation of heating equipment, while the former is gentle on radiators.
Scheme with boiler
The connection diagram of a single-circuit gas boiler may suggest the presence of an indirect heating boiler. You can implement this idea using different rules. One of the technologies involves connecting the boiler in parallel. This will require a three-way valve. It should be located on a flexible pipe connecting the boiler and battery supply pipe. Thanks to this, the water will circulate through the boiler and move around. Such a scheme is accompanied by the connection of a flexible pipe to the return line. The first one will move away from the boiler.
An indirect heating boiler can be included in schemes where there is a hydraulic arrow. This option is suitable for systems where the number of circuits is quite large. For implementation, it is necessary to follow one rule, which is to install a safety group on a circuit with a boiler, where a circulation pump is also connected. Some schemes may involve connecting the boiler in series.
If you choose the connection scheme for a double-circuit gas heating boiler, the one described may also work. But the situation with a two-circuit unit has one exception. The hot water supply system will need to be connected to the second circuit. Usethanks to this, an indirect heating boiler is not needed, but there is a nuance. Double-circuit equipment is suitable for houses whose inhabitants consume a small amount of hot water. But when the volume of fluid consumption is large, the second circuit will not have time to heat it. Devices with a layered heating boiler or storage tank can alleviate the situation.
Instructions for connecting dual-circuit wall equipment
The connection diagram of a double-circuit gas boiler assumes the presence of a shut-off valve and a filter on the pipeline. The last device will ensure the purity of the water in the system. You can also do your own installation. To do this, using a threaded connection, the device is screwed onto the pipe nozzle. It is important to pay attention to the arrow on the device, which should indicate the direction of the water.
The connection diagram of a double-circuit gas boiler should include a shut-off valve, which will be needed if you need to shut off the water supply to repair the boiler, replace or clean the filter. Next, you should connect the pipes of the pipe and the heating system. It will be necessary to install shut-off valves, connect them to the boiler. The shut-off valve must be a ball valve.
When studying the connection diagram of a wall-mounted double-circuit gas boiler, you should pay attention to the fact that the equipment includes an internal circulation pump. He will be responsible for the distribution of heat to the radiators. This device requires special binding. The wall unit depends onelectricity, so a power outage will reduce the efficiency of the system, which will be accompanied by a loss of thermal energy.
At the last stage of the connection, it is necessary to deal with the gas pipeline. For the boiler, you should find a place so that it is closest to the gas pipe. The connection diagram of a wall-mounted gas boiler, however, may involve the use of special gas hoses. But they don't have to be long. It is better to bring the pipe to the installation site of the heater.
Description of the connection diagram and installation features of outdoor equipment
To begin with, the boiler is installed in its place. This can be a podium made of refractory board or a concrete base. If the room has a wooden floor, cover it with a metal sheet that protrudes 30 cm from the boiler body around the perimeter. For private houses, you can use another option. A recess is prepared for the heater 0.30 m below the floor level. The bottom of the pocket is filled with concrete, and the walls are finished with non-combustible material.
The boiler will need a chimney, which, in turn, needs a hole. The diameter of the intended parts must be checked again. It should be slightly larger than the pipe section. A transitional adapter is put on the outlet pipe of the boiler, which is connected to the chimney. It is forbidden to use corrugation when installing wall-mounted equipment. The structure is fixed to the wall or ceiling with clamps and brackets.
Scheme for connecting a gas floor boiler at the stage of connecting to the heating systemis accompanied by a drain and supply pipeline to the heating equipment. For single-circuit devices, this ends the work, while for double-circuit units it will be necessary to connect to the water supply.
First you should deal with the heating pipes. To protect the boiler from scale and dirt, it is necessary to install a strainer. Shut-off valves are installed on the return and supply, which prevents batteries from airing and makes repair of the heater easier. For sealing when connecting elements, it is important to take care of sealing. For example, in the case of carving, you can use tow or paint.
The procedure for connecting the boiler to the water supply is almost the same. It is important to install a filter to prevent contamination from entering the device. Shut-off valves are installed on the water pipes. It is better to use American women with detachable connections, which allow you to replace a worn-out assembly fairly quickly. It also makes installation easier.
In closing
At the stage of building improvement, it is required to connect heating equipment. If it is a gas appliance, the work is one of the most responsible. Comfort in the house will depend on the quality of installation work and the selected materials. A properly selected piping scheme can protect the system from overloads and provide heating for all rooms.
