Automation for Lemax gas boiler

Gas floor-standing boilers Lemax with a steel heat exchanger

This class is represented by five categories, each of which has its own gradation in terms of unit power. Thus, you can select the heating device to suit your needs as accurately as possible. The main thing is that the pressure in the heating system does not exceed 2 atmospheres. Let's look at the categories of heaters with a steel heat exchanger in more detail:

• Lemax premium boilers;
• premium nova;
• patriot;
• gas worker;
• clever.

Lemax premium steel boilers are divided into two groups. The first is from 7.5 to 60 kW, the second is from 70 to 100 kW. The units are made of steel 2 mm thick. For greater efficiency, the heat exchanger is made in the shape of a cylinder, just like Conord boilers.

The inner surface of the heat exchanger is protected with inhibitory compounds, which prevents the deposition of scale and salts.

The heater is non-volatile and equipped with Italian SIT automatic equipment. The smoke temperature in Lemax heating boilers is at least 110 degrees. Maximum water temperature 90 degrees. The unit operates at a nominal gas pressure of 1.3 MPa.

Some improvements have been made to the Lemax heating boiler of the premium nova series. The temperature regulator is now located on the front of the housing, and it is now possible to connect a thermostat and a turbocharger for the chimney. In addition, the heater is equipped with a soft start system. The power of the units in this series ranges from 7.5 to 30 kW.

The peculiarity of the Patriot series boilers is that they have a closed combustion chamber. The unit does not need to be connected to the electrical network and does not require the installation of a full chimney. This is a parapet boiler that takes combustion air from the street through a special pipe (similar to a chimney). At both ends there are outputs for connecting to the heating system. Power varies between 6-20 kW. All models are single-circuit.

According to reviews, infrared quartz heaters for summer cottages are less reliable than carbon ones.

Read this article about how to choose a heater for your room.

The gas worker series is a classic AOGV with a power from 6 to 29 kW. Accordingly, the device is volatile, the combustion chamber is of an open type, the operation is controlled by a thermocouple. Compared to models of other series, the gas line has a slightly lower efficiency (87% versus 90%). The heaters are equipped with draft, gas and water pressure sensors. Available only in single-circuit version.

The clever series heaters have the widest functionality. An indirect heating boiler, indoor and outdoor temperature sensors, a turbocharger for the chimney, and a control unit via the Internet can be connected to the boiler. Thermal power from 20 to 55 kW. Consumes 9 W of electricity per hour.

Operating principle of Lemax gas floor boilers

It is not much different from the operating principle of standard gas units: the gas-air mixture coming from the burners is ignited in the firebox, and the heat of the burning fuel heats the working fluid (water) in a special block (heat exchanger). Hot water periodically enters the heating line, and cold water comes in instead. Excess coolant generated during operation is discharged into the expansion tank.

Automation controls the temperature of the water in the circuit (and therefore a similar indicator for the air in the room), as well as several other parameters:

• presence of draft in the chimney;
• water and gas pressure in the main;
• operation of the ignition system.

Lemax double-circuit gas boilers, in addition to the main heating function, have an additional function: heating water. This is necessary so as not to install a boiler or hot water column together with the unit.

The heat exchanger in such installations is most often of a cast design - this indicates that it is made of cast iron. This design guarantees high corrosion resistance (the material is less susceptible to the destructive action of water and salts dissolved in it), as well as good boiler performance. Cast iron has a higher heat transfer rate than steel, so it is no coincidence that radiators for heating systems are still made from it. In addition, components for Lemax are produced at the factories of well-established Czech manufacturers.

Gas floor-standing boilers Lemax with cast iron heat exchanger

Heaters of this class can operate in heating systems with a pressure of up to 4 atmospheres. The wall thickness of the heat exchanger is 4 mm, which makes it very durable. Cast iron, unlike steel, is less susceptible to contamination, and its service life is much longer. There are two types of heaters in this category: leader and wise.

In a solid fuel boiler, coal is loaded through the top.

Lemax leader gas boiler, technical characteristics:

• non-volatile;
• power 16-50 kW;
• Efficiency 91%;
• overheat protection;
• traction sensor;
• maximum water temperature 80 degrees;
• nominal gas pressure 1.3 MPa.

The temperature control is located on the front part, with a pressure gauge located nearby. It is possible to connect a room thermostat. Thanks to this, you can set the required temperature in the room, which will be maintained at the same level. If necessary, you can install a fan to improve smoke removal.

Wise series boilers are connected to the electrical network, consumption is 7 W/hour. They can heat the coolant up to 90 degrees. They have an uninterruptible power supply installed, so voltage drops are not a problem for these boilers. The unit has connections for connecting an indirect heating boiler, various types of thermostats, and wireless control units. The option of switching to another type of energy carrier (liquefied gas) is also allowed.

Lemax gas boilers: technical characteristics

in single- and double-circuit versions

1. High-quality cast iron MF - thickness 4 mm with a possible pressure of 4 bar when the burner is operating.
2. The heat exchanger is covered with thermal insulation.
3. An inhibitory composition is used as an anti-corrosion coating, which slows down the destruction process.
4. All models are equipped with a protection system against soot formation, traction interruption, flame burning and overheating.

Heating devices are divided into two groups with cast iron and steel heat exchanger. If you choose the right model, you can significantly save on heating the entire house. There are several types of heating equipment based on the following characteristics.

• Number of circuits. Single-circuit steel models operate practically without failures, are non-volatile, and provide maximum performance. It has low natural gas consumption, a good option for heating a home heating system.
• The Lemax double-circuit floor-mounted domestic gas boiler operates in two modes - heating the coolant and water for hot water supply, and is highly economical. They are the optimal and economical option for private houses with a large area.
• Heat exchanger device. There are two modifications; they are distinguished by the material that is used in the production process of boilers. Models with a cast iron heat exchanger have better technical performance than other models in the entire range. Cast iron reacts well to aggressive environments, is resistant to overheating, and has anti-corrosion properties.
• Models with steel heat exchangers are sensitive to the quality of the coolant. The steel heat exchanger is 2 mm thick and requires a water treatment system to operate.

Gas wall-mounted boiler Lemax

The Lemax company produces only one line of prime-v wall heaters. Each device is equipped with SIT automation made in Italy. All models in this series are dual-circuit and can operate in heating systems with a pressure of up to 3 atmospheres.

Chimney of a parapet boiler.

The boilers are equipped with a closed combustion chamber, so they require the installation of a coaxial chimney. A fan is located above the combustion chamber. Turbocharging is needed to pump in air from the street and at the same time remove smoke outside. The maximum length of a coaxial chimney can be up to 5.5 m.

Solid fuel boiler Lemax

Solid fuel heaters are available in two configurations:

• solid fuel boiler – forward series;
• potbelly stove – series heat house and heat house-S.

According to reviews, the Lemax solid fuel heating boiler is designed to operate on coal. In this case, it is possible to use firewood and even natural gas as an alternative. In the latter case, you need to order a special burner. The peculiarity of this unit is the vertical loading of fuel, the hatch is located on top. Coal can be poured directly from the bucket.

The most economical heaters for an apartment are those that are equipped with good automation and thermostats.

About kerosene heaters for summer cottages is written here.

The TT boiler is available in three capacities (13.17 and 21 kW). Heats water up to 95 degrees, works in autonomous heating systems with pressure up to 0.2 MPa. The efficiency is quite low - only 75-80% for coal and 72-77% for wood.

Potbelly stoves are made from 4 mm steel. They come with a flat top and a basket for stones. The last option is used in doubles. The thermal power of both stoves is 10 kW. Weight 65 and 80 kg. Logs up to 60 cm long can be placed in the firebox. A potbelly stove can only be heated with wood.

Autonomous heating systems based on gas boilers are widespread in European countries.

In our country they are less popular, however, the situation is changing every year. Users are actively switching to heating using imported and domestic heating installations.

The choice of boilers is very wide, which makes it possible to choose the appropriate installation for any conditions or room size.

Let's consider floor-standing gas boilers produced by the domestic company Lemax.

Lemax floor-standing gas boilers

The Lemax company was founded in 1992 in Taganrog. Gas boilers produced by this company are assembled from imported components from leading European manufacturers.

Floor-standing boilers are non-volatile, operate on natural draft and do not need to be connected to the power supply, however, they have the ability to connect water heating units and turbo nozzles to create forced draft.

Lemax floor-standing boilers are presented in a large assortment; the model range has samples with a power from 6 to 100 kW, which allows you to heat apartments or large houses.

Requirements for installing Lemax gas boilers

All the basic requirements for the installation and operation of Lemax heating equipment are exactly the same as those of many other manufacturers. The technical characteristics of all products are high, but subject to compliance with all installation and operation rules.

1. The device has a draft sensor; if the intensity is insufficient, the burner turns off. The main task during installation is to create all conditions for good traction. The company's manufacturers recommend using a chimney when connecting, which is best made from sandwich pipes.
2. The models need some modifications; for example, floor-standing gas boilers can often heat water insufficiently to be used for domestic needs. Experts advise choosing a single-circuit unit in order to connect an indirect heating boiler to it, in this form it will be able to heat a large amount of water at the required temperature.
3. Boiler piping. The circulation pump is installed on the return line of the heating system directly in front of the unit.

Advantages and disadvantages

The advantages of Lemax floor-standing gas boilers include:

• Simplicity, reliability and durability of the design.
• Non-volatility, increasing stability and reliability of operation.
• Ease of Management.
• Low fuel consumption.
• Relatively low price with high quality components.
• It is possible to only heat the home, or additionally prepare hot water.

There are also disadvantages:

• Ignition of Lemax boilers is quite difficult, especially if you lack the skill.
• Natural cravings are very unstable and depend on many external factors.

Disadvantages are common to all energy-independent models of gas boilers. However, they are many times compensated by undoubted advantages, so it is more correct to consider them design features.

What series and models are floor-standing

The Lemax group of floor-standing boilers includes the following series::

• Patriot . There are 6 models available with a power from 6 to 20 kW, which is optimal for apartments or small private houses. Parapet-type units are equipped with convection openings in the body, allowing the room to be heated. If such a boiler is in the kitchen, radiators will not be needed. A coaxial chimney eliminates the need for labor-intensive connections to a common house pipe.
• Premium . The series consists of single- and double-circuit models of floor-standing gas boilers with a power from 7.5 to 100 kW. There are 22 models in total. Double-circuit units have the letter B in their name. The most capacious series, allowing you to select the right boiler for any room or operating conditions. The simplicity of the design makes them very reliable and durable, and the low gas consumption contributes to the popularity of this equipment.
• Premium N. They differ from the basic Premium series by the presence of a gas valve 820 Nova Sit. The remaining features and parameters are the same as the main line models, but the power of the models is limited to 35 kW.
• Wise . These boilers are new, they appeared relatively recently. Made from ductile gray cast iron. They have 5 models with a power of 16, 25, 35, 40 and 50 kW. Single-circuit models with a sectional heat exchanger. They differ from conventional series in the need to connect to the power supply network.
• Leader . They are also a new product in the Lemax model range. Non-volatile single-circuit boilers with power from 16 to 50 kW. The cast iron sectional heat exchanger allows for high efficiency of thermal energy transfer.

Floor models

Floor-standing models from Lemax are equipped with a Czech heating heat exchanger made of 4 mm thick cast iron or high-strength steel. There are non-volatile and volatile floor-standing devices. Non-volatile units are equipped with automatic Euro Sit and Mini Sit, which recognizes the temperature of the coolant by expanding or compressing the working fluid in a temperature sensor, based on which the required pressure level is set in order to maintain the temperature regime.

When using modern NOVA SIT automation, information about the temperature of the coolant can come from the base thermostat and peripheral devices.

Energy-dependent floor-standing units are equipped with automatic SIT with smooth flame modulation. The reliability of the devices is ensured by their resistance to changes in voltage and gas pressure.

A series of non-volatile devices that work only for heating include Premier and AOGV boilers of various capacities. The efficiency of these gas boilers is 87-88%. There are also Leader units, the efficiency of which is at the level of 90-91%.

The NordGas control board built into volatile boilers provides the following capabilities:

• connecting and controlling the operation of an indirect heating boiler;
• inclusion in the Smart Home system;
• control via wireless systems;
• connection of weather-compensated automation.

Wise floor units are equipped with a cast iron circuit, which is not subject to corrosion and has a long service life. Models include 16, 25, 35, 40 and 50 kW units. Efficiency=90%.

Specifications

Let's look at the table of the main technical characteristics of Lemax floor-standing boilers:

Device

Lemax floor-standing gas boilers have a heat exchanger in the form of a welded or cast iron container that forms a water jacket around the combustion chamber.

A gas burner is installed in its lower part, and under it there is a gas valve, control devices and connecting pipelines . The upper part of the heat exchanger has a passage for installing a chimney, which can be of a classic or coaxial design.

The connections for connecting the heating circuit for different models are located either on the sides or on the back of the boiler. There is also a hot water supply pipeline (for dual-circuit models).

The operation of the unit consists of the coolant entering the heat exchanger tank, heating and exiting independently under the influence of gravity - the density of the heated layers decreases somewhat, which helps to displace them by colder layers of liquid.

Self-circulation of the coolant is based on this effect. Hot water is heated in a copper coil installed inside the heat exchanger .

Smoke removal occurs under the influence of natural stove draft.

User manual

Operation of Lemax floor-standing gas boilers comes down to igniting the burner as needed and setting the desired temperature. All other operations - replenishing the volume of water in the heating circuit, installing a chimney, connecting a boiler - are performed without interfering with the boiler design.

To ignite the burner, turn the regulator to position 1, which means switching on the operating mode. Then you need to push it all the way and hold it while pressing the piezo ignition button.

When the pilot burner lights up, the button is released, but the regulator is held for about a minute.

Periodically it is necessary to clean the internal components of the boiler from carbon deposits and soot . You also need to monitor the condition of the heat exchanger, gas valve and other components of the unit.

Periodic maintenance should be performed by specialists from the service center. It is not recommended to do this work yourself, especially if the warranty period has not yet expired.

Boiler maintenance rules

Lemax double-circuit floor-standing gas boilers are distinguished by their unpretentiousness in operation, due to the fact that they are manufactured in domestic conditions, they are easy and simple to maintain. The manufacturer is constantly improving the design of its products, as service specialists say, they are characterized by high maintainability. Moreover, some common problems can be easily fixed without calling an adjuster.

Read the link about the advantages and features of double-circuit gas boilers.

Owners of boilers (and not only this brand) often complain that the burner ignition is blocked due to an allegedly clogged chimney. Smart automation is adjusted in such a way that it reacts to a lack of traction: in order to avoid emergency situations, a special device does not allow the gas to be ignited. The problem most often lies in the sensor, or rather, in the oxidation of its contact group. It is enough to remove the contamination, and the boiler works normally again.