Setting the boiler temperature
When setting the temperature of both water and heating, it is important not to go to extremes. You should not use maximum or minimum values. For hot water is suitable temperature 38-39⁰.
It makes no sense to set the temperature higher and then mix it with the cold, because the boiler heats the full flow more efficiently than the half flow, which is then controlled by the mixer.
If you use a thermostat, it is best to install it in the coldest room, setting the temperature on it so that the house is comfortable.
It is important that it is not affected by nearby heaters and direct sunlight.
This is a miracle that can come with the boiler.
Whoever said what, but the floor heating is power. If you compare the heat output area of the radiator and the floor, the advantage is not in favor of the first. And the radiator cools down incomparably faster than a block of concrete.
I made all the rooms in my house with underfloor heating except for the bedrooms, and I’m as happy as a cat. And what a delight to walk into the bathroom in the morning and step on the warm as a rug tile.
How to save gas when heating a private home with gas
Owners of country houses try to minimize the consumption of gas for home heating, taking into account the overall comfort of living.
The reason for this is an increase in the price of natural fuel, due to which the owner has increased family costs to pay utility bills.
The thermal energy created by the combustion of gas in the boiler is additionally used to compensate for heat loss. This is especially true in the winter, when the ambient temperature can go deep below.15 degrees.
How to reduce high gas consumption by a boiler for home heating
Drainage of combustion products of gas from the closed combustion chamber of the boiler turbo is forced, fan-smoke pump in the chimney. Air is supplied to the combustion chamber from the street through the duct, due to the rarefaction created by the working fan.
Gas boilers with closed combustion chamber and forced smoke exhaust are equipped with a pressure sensor, which is triggered when the normal smoke removal and combustion air supply is stopped, in case of malfunction of the fan.
The system of smoke and air ducts of the boiler is conducted upwards, through the roof, or horizontally through the outer wall of the room in which the boiler is installed.
Manufacturers of turbo boilers recommend to choose one of two principal schemes for the arrangement of the smoke/air duct system:
- Concentric coaxial “pipe-in-pipe” system. Where the exhaust of the products of combustion is conducted through an inner metal pipe running inside another pipe of larger diameter. The supply of combustion air takes place through an annular gap between the pipes.
- A separate system of pipes, where the exhaust of combustion products is carried out through one pipe, and the inflow from the street air for combustion is carried out through another separate pipe.
The requirements for the smoke and air duct system are defined in the installation and operating instructions of the boiler.
Do not exceed the maximum allowable length of the smoke/air duct system. If the smoke/air duct system is too long or there are too many turns, the overall aerodynamic drag of the smoke/air duct system will be too great. The fan will not be able to supply the burner with the necessary amount of air.
Sections of the chimney from the outside of the building or passing inside the unheated room longer than 1 m., must be thermally insulated. This will reduce the formation of condensation in the pipes.
On the vertical parts of the chimney it is necessary to install a condensate drain. catching the condensate formed in the chimney, with discharge of condensate into the sewer. Horizontal flue gas and combustion air pipes must be laid with an inclination of 1.2 % to the side of the boiler.
Coaxial smoke/air ducting for gas boilers. L. see manual. 1. O-ring; 2. Throttling insert in the fan throat prevents the excess air flow to the burner.
The throttling insert in the chimney saves gas
With short smoke/air ducts the aerodynamic resistance of the system is small. As a result, the amount of air sucked into the burner by the fan can be excessive.
To increase the aerodynamic resistance of the system and to reduce the amount of air inlet to the burner, in turbo boilers it is necessary to install throttling insert. diaphragm, diffuser. In addition, the throttling insert reduces the influence of the wind on the operation of the burner via the smoke evacuation system.
The throttling insert can be used to adjust the optimal air supply and in other cases.
If a combustion analyser measuring the excess air in the flue gases of a boiler operating at maximum output is borrowed, the boiler can be provided with an optimum air supply by means of the restriction insert.
Optimal combustion parameters are reached at excess air ratio values around 1.7-1.8. Values of the excess air ratio above 1.8 indicate that an excessive amount of air is flowing through the boiler.
Correctly installed throttle valve saves gas.
Boiler with gas/air regulator consumes less gas
Schematic diagram of the construction and operation of a boiler with automatic control of the optimum air/gas ratio and a Honeywell VK42 gas valve. / VK82. SERIES
You can find gas boilers on the market (incl.ч. double-circuit) for heating private houses and apartments, equipped with an automatic regulator of optimal air/gas ratio.
In the diagram, the gas flow rate is controlled by the gas valve, depending on the amount of air supplied by the fan to the boiler burner. To change the boiler output, the automation regulates the amount of air, and the amount of air already changes the gas flow rate. The gas flow rate adapts, as it were, to the amount of air. This allows you to get the optimum ratio of gas to air for combustion throughout the boiler output range. The efficiency of the boiler increases, especially when operating at low power. This is important, since most of the time the boilers operate at reduced power.
There are gas boilers, in which the reverse control algorithm gas / air. The power of the boiler is controlled by the gas flow rate, and the automatics changes the amount of air to suit the gas flow rate.
The condensing boiler saves gas
Diagram of operation and arrangement of the condensing gas boiler
How a condensing boiler works
During the chemical reaction of gas combustion in the boiler burner two main products are formed. carbon dioxide CO2 and water H2O. in the form of steam. The flue gases heated to a high temperature, which also includes other atmospheric gases, partially transfers the heat to the heating water in the primary heat exchanger. The flue gases are cooled down, but their temperature, including the water vapor, remains quite high after the heat exchanger. In a conventional boiler, the heat of the flue gases escapes into the chimney and into the street.
In the condensing boiler, after the primary heat exchanger, the flue gases pass through another heat exchanger. The heating water from the system passes first through the condensing heat exchanger, is heated there, and then enters the primary heat exchanger, where it is finally heated to the desired temperature.
It is known from school physics course that the process of condensation of water vapor, which is contained in large quantities in the combustion products, is accompanied by the release of a significant amount of heat. In order to extract the maximum amount of heat from the flue gases, the temperature of the condensing heat exchanger is selected so that the steam is converted into water on its surface.
Active conversion of steam into water in a condensing heat exchanger takes place when heating water with a temperature of no more than 50 oC is supplied to the exchanger. For this reason, condensing boilers are effective only in low-temperature heating systems, with underfloor heating or with radiators operating in standard soft heat mode 55/45 oC or 50/30 oC. Many homeowners don’t attach the necessary importance to this condition. As a result, the purchase of a condensing boiler brings them disappointment. They do not get the expected gas savings.
To switch from standard mode to soft heat capacity (size) of radiators will have to increase by about 2 times. Accordingly, the cost of the heating system will also increase.
In the process of condensation, water reacts with other products of combustion and turns into an acid solution. Therefore, heat exchangers and other parts of the boiler that are in contact with condensate have to be made of stainless steel.
By using the higher heat of combustion of gas (that is, the heat of combustion and the heat of condensation of water vapor), the efficiency of condensing gas boiler is 11. 13% higher than that of the classic boiler.
Gas alarms save gas
System of automatic control of gas concentration and protection against gas leaks in a boiler room in a private home: 1. carbon monoxide alarm; 2. alarm for natural gas; 3. shut-off valve on the gas pipeline; 4. gas boiler; 5. detector in the house, which alerts the residents of the house with light and sound.
As of 2016, the building regulations (clause 6.5.7 SP 60.13330.2016) require that methane and carbon monoxide (carbon monoxide, CO) gas alarms be installed in new residential buildings and apartments with gas boilers, water heaters, stoves and other gas equipment. For already constructed buildings this requirement can be considered as a recommendation.
Methane gas alarm serves as a sensor of leakage of domestic natural or liquefied gas. Alarm for carbon monoxide is triggered in case of violations of the smoke exhaust system and the flow of flue gases into the room. Installation of alarms allows time to notice gas leakage and malfunctioning of the smoke exhaust duct in the boiler.
Gas detectors should be triggered when the gas concentration in the room is equal to 10% of the lower limit of flame spread of natural gas and the content of CO in the air is more than 20 mg/m3. Gas alarms should control fast-acting shutoff valves installed at the gas inlet to the premises and shut off the gas supply at the signal of the gas sensor.
Systems of control of gas concentration in premises with automatic shutoff of gas supply in residential buildings should be provided when installing gas equipment, regardless of its location and capacity.
Filter on heating system return pipe reduces gas consumption
Using a boiler with a heating system the coolant of which is mechanically polluted (sludge, dirt, remnants of installation material) may result in sedimentation of dirt, rust particles and scale on the inner surface of the heat exchanger. This leads to violations of the heat transfer process, and as a consequence, an increase in gas consumption. In addition, there is an overheating of the heat exchanger tubes and, as a result, premature failure of the heat exchanger.
After installing or repairing the heating system it is recommended to flush the heating system with special chemicals followed by a rust inhibitor.
It is better to replace the steel pipes and radiators of the heating system with new ones that are not subject to corrosion.
It is not recommended to drain the heating system and leave it for a long time without water. Steel parts of the system without water from the inside rust intensively. Fresh water filled into the system contains oxygen that will add its portion of corrosion.
The walls of conventional plastic water pipes are gas permeable. Heating water in these pipes is constantly saturated with oxygen from the air. Therefore it is recommended to use special plastic pipes with a protective gas-tight layer in heating systems (metal-plastic, etc.).). Polymeric pipes used in heating systems must have an oxygen permeability of max. 0.1 g/(m3-d).
Sludge, dirt, corrosion products get into the heating water during installation, repair, filling of the heating system with water, and are also formed there permanently during operation.
To protect the parts of the boiler from dirt, on the return pipe of the heating system in front of the boiler the filter for mechanical treatment must be installed.
Filter FMM (magnetic mesh socket filter). The filter is installed at the heating water inlet to the boiler, on the pipeline with the cap down horizontally, so that the direction of fluid flow corresponds to the arrow on the filter body. Before and after the filter it is recommended to install a shutoff valve, which allows you to clean the filter without draining the heating water.
Mesh and magnetic system are installed inside the FMM filter body. Stainless steel strainer with mesh size of 0,50,5 mm serves to catch mechanical particles from the flowing liquid. Magnetic system is designed to trap small ferromagnetic inclusions (rust).
For a complete cleaning of the FMM filter it is necessary to remove the cover, remove the mesh and the magnetic system. It is recommended to use a new gasket when installing the cover afterwards. It is recommended to clean the filter annually, during the technical maintenance of the boiler.
Other filters, similar in appearance, without magnetic system and/or with a larger mesh size are available on the market. Do not make a wrong choice.
Some models of boilers have a built-in strainer at the heating water inlet to the boiler. On the return pipe of the heating system, before the boiler, it is recommended to install an additional filter which is easier to clean than the built-in one.
Two boilers instead of one reduce the gas consumption
Each of the heating boilers has a lower capacity than the calculated one for the house. One boiler (gas) operates for most of the heating season in a mode with higher efficiency. Electric boiler backs up the operation of the gas boiler and supplements the capacity of the gas boiler in cold weather.
When operating at minimum power, the efficiency of the boiler decreases. Some owners find it profitable to install two boilers. For example, instead of one 30 kW. One 20 kW and the other 10 kW. One boiler works most of the heating season, both turn on only in the most frosty weather. Thus, the boiler operates with a higher efficiency throughout the heating season.
In addition, the boilers back up each other. Boilers tend to break down at the most inopportune moment, on weekends or in cold weather, or when the owners are not home. In order to back up the gas supply, a smaller capacity boiler is sometimes selected for another type of fuel. Such boiler is activated for a short period only during frost or repairs of another boiler. Therefore, the reserve boiler can operate on a more expensive fuel.
One reserve boiler can not provide thermal comfort in the house during the cold season. But it will not let you freeze. It can be tolerated, given that such a coincidence does not occur every year.
Soft heat radiators reduce gas consumption
In the catalogs of manufacturers, the maximum heat output of radiators is given for the temperature 90/70/20. Where 90 oC. temperature of heating water in the supply, 70 oC. temperature at the return pipe and 20 oC. temperature of air in the heated room.
In dwellings the heating system with radiators as heaters and steel distribution pipes is usually calculated for a temperature regime of 80/60/20. Such a sufficiently high-temperature mode allows you to increase the heat output of radiators, choose radiators and pipes of minimum size, and thus reduce their cost.
In modern radiator heating systems with plastic pipes are usually used more forgiving for the pipe temperature 75/65/20.
In the figure above is the standard temperature operation of the radiator in systems with plastic pipes. Bottom. maximum radiator temperatures for comfortable mild heat.
If you set the goal of saving heating costs, it turns out that in radiator heating systems, it is advantageous to use the mode with lower temperatures. For example, the European standard of soft heat 55/45/20.
It is known that the greater the difference between the temperature of gases in the boiler burner and the temperature of water in the heat exchanger, the more intense the heat transfer process from hot to cold. The lower the temperature of the flue gases, the more heat remains in the house and less goes down the chimney.
Soft temperature mode also makes it easier to arrange a combined heating system with radiators and underfloor heating. Thermal comfort in the house with soft heat radiators becomes more pleasant for the person.
The main advantage of low-temperature heating is the possibility of using modern technology. We are talking about condensing boilers, solar collectors and heat pumps. They require that the system has a low temperature of heating water.
True, to switch from the standard mode to soft heat capacity (size) of the radiator will have to increase by about 2 times.
The right meter on the gas pipe saves gas
Household gas meters, as a rule, do not have pressure and temperature sensors, and do not adjust their readings when these parameters change in the gas pipe.
The amount of gas is determined by its mass and measured in units of g, kg, or t. Calorific value is the amount of thermal energy released during combustion of gas, also depends on the mass of the burned gas.
But the gas meter on the pipe does not count the mass of gas, but the volumetric flow of gas in m3 that passed through the meter. And from school physics course we know that the amount of gas, kg, in 1 m3. is highly dependent on the pressure and temperature of the gas at the moment it passes through the meter.
It is customary to apply the results of volumetric flow measurement to the same standard conditions: pressure of 101.325 kPa (760 mm.rt.st.), gas temperature 20 °С.
Thus, a cubic meter for the purpose of gas accounting and billing is the volume of dry gas, which occupies a space of one cubic meter at a temperature of 20 oC and an absolute pressure of 101.325 kPa.
Industrial gas meters are equipped with pressure and temperature sensors, which allow taking this dependence into account and determining the amount of consumed gas under standard conditions and with high accuracy.
Gas meters for residential purposes are usually not equipped with pressure or temperature sensors and do not correct their readings for variations of these parameters in the gas supply pipe. The meter without correction shows consumption of gas at operating conditions (t.е. Pressure and temperature are different from the standard).
It is believed that in a low pressure gas network (less than 0.05 bar or 5 kPa), the gas services should limit pressure variations in the gas network by technical means within a fairly narrow range, within 15 mbar. Therefore, the effect of these pressure changes on the accuracy of the gas flow can be neglected. And a constant correction factor is used to bring the meter readings to standard pressure conditions.
It is not economical to use pressure correction for household appliances also because such meters are expensive, less reliable and hard to use.
But is it all so in real life?
Real gas distribution networks often have long distances and insufficient capacity, which leads to significant pressure fluctuations in the far reaches of the network when the gas consumption changes. Seasonal pressure changes can be particularly great, especially in frosty weather, when gas consumption dramatically increases.
According to the standards, the maximum dynamic gas pressure in the supply line should be 25 mbar (255 mm.water.st). If you are lucky and it is really true, then the gas meter will display the gas flow rate that is almost identical to the real one. Т.е. There will be little measurement error.
If your neighbor is unlucky, and the dynamic pressure in the gas supply pipe will be at a permissible minimum for the boiler 15 mbar., all other conditions being equal, the meter will show a consumption that is about 12% higher than the actual gas consumption. Т.е. if the actual consumption is 1 m3, the meter will show the result 1.12 m3. And if in frosty weather, the pressure in the gas pipe drops below the norm, for example, to 11 mbar, the gas meter instead of actually consumed 1 m3 of gas will show an increase even greater.
The lower the pressure in the gas network, the more profitable to the gas business. They don’t advertise this kind of profit. The population is not offered any pressure adjustment options. And the population does not require it.
This is not the case with adjusting residential meters to standard temperature conditions. Gas meters without temperature correction underestimate gas consumption in winter time. In order not to lose income, gas businessmen have invented and approved temperature coefficients.
For normalizing to standard conditions, the gas flowing through the meter without the thermo-adjustment shall be multiplied by the temperature coefficient. The size of the coefficient is approved for each region.
It is worth explaining separately that the temperature coefficient applies only to the readings of meters installed outside heated rooms (in the street). Since they receive gas either cooled by winter temperatures or “heated” by summer heat. If the meter is installed in the heated room. in the house, in the apartment. the coefficients do not apply.
For people who have a gas meter in the street, the temperature coefficient in the middle zone for summer months is 0.96. 0.98 and in winter is about 1.15, and the average for the year is about 1.1. The coefficient is applied on a monthly basis, without taking into account the actual temperature of the gas supplied. The amount of gas for the month is calculated as the product of the volume of gas on the meter for that month and the corresponding temperature coefficient.
The gas business pays for the calculation and justification of temperature coefficients. It is clear in whose favor they are calculated.
In order to avoid applying temperature coefficients when paying for gas, it is better to install a meter with a temperature corrector which will automatically calculate the gas consumption according to the actual temperature. This is especially true for those who consume increased amounts of gas, for example, for home heating and water heating. The meter with a thermal correction often has a letter “T” in the model name of the meter, for example BK-G4T.
High quality gas in the gas pipe reduces gas consumption
Quantity of heat energy, which is released during combustion of gas, also depends on indicators of gas quality. The natural gas that comes into the boiler from the gas pipe is not homogeneous in composition. In addition to methane, it may contain other combustible gases, as well as water vapor, atmospheric air gases and other impurities. Depending on the ratio of these components, the calorific value and consumption of gas change.
Norms allow for some variations in gas quality parameters. In addition, in some cases the quality of gas may be worse than the established standards. You, as a consumer, have no possibility to control and somehow influence the quality of gas supplied from the gas network to the boiler. Whether this circumstance violates the rights of the consumer, I do not know. But you should understand that the consumption of gas today and yesterday may be different, because the quality of gas has changed.
How to save gas at home
Install a gas meter. With a gas meter, you can monitor your gas consumption on a regular basis, and you can analyze, reduce, and optimize your gas consumption. If gas consumption is high and a gas stove is used frequently, use appliances marked G-1.6. If you have a gas boiler, a G-2.5 model is the right choice.
The number on the meter indicates the minimum flow capacity of the device. The G-1.6 meter allows 1.6-2.5 m3 of gas, the G-2.5 allows 2.5-4 m3 and so on.
If using a gas boiler for hot water, install an economical shower head and faucet. It’s more economical to wash in a shower than in a full bathtub. 80 liters of water flows through the shower in five minutes. This volume is not enough to fill even half of a standard bathtub.
To wash dishes, it’s better to put water in the sink and wash things in it. A suitable option would be to use a sink with two trays, where in one you wash the dishes and in the other you rinse in clean water. These tips will not only help reduce the cost of gas, but also save water in the house or apartment.
Where the gas is consumed?
Fuel is used to make up for the various heat losses.
- Through any envelope installed in the house. For example, through a window, wall, attic, basement, and so on.
- With the air mass inside the room, which is removed through the ventilation system.
- With wastewater flowing into the sewer.
- Losses inside the heating system itself.
You need to start saving energy from the beginning. with the purchase and installation of a modern heating boiler.
- Necessary output of the boiler is calculated on the basis of the following rule: per 10 sq.m. of flue gas per flue.м. the heated area of 1 kW of thermal energy, with a ceiling height of not more than 3 meters in this calculation. So, the house area of 200 sq.м. can heat a boiler with a capacity of at least 20 kW. After making the necessary calculations, a heating unit is purchased with a small tolerance to increase and the distribution of pipes is made. The most profitable system of heat carrier distribution is considered a collector system.
- This system allows you to adjust the temperature in each room depending on how often it is used by tenants. This can be done manually, or you can install thermoregulators, which will regulate the heat in the radiators.
- Automation of the heater. There are many different types of automation on the market, from the simplest to the very expensive. For example, one of the latest products are thermoregulators with sensors of outside air temperature. When the temperature of the air “overboard” increases, the automation starts to supply less fuel to the burners, and it is already a real gas savings when heating a private home.
- According to many experts, a more profitable type of heat transfer fluid is a system of “floor heating”. When it is installed, the warm air is distributed more evenly throughout the building. In this case, the water is fed into the pipes in the floor with a temperature of 65 degrees, and in the radiators of heating. 95 degrees. However, it becomes more difficult to adjust the temperature in different rooms.
- Providing hot water for household needs is best organized with a gas flow heater (column) or double boiler. Note that in a two-circuit boiler is a single burner, so when it heats the water for the bathroom, the heating at this time does not work.
The easiest way to find out the gas consumption of the boiler per hour is to multiply the available capacity by 0.12 m3. This is the parameter needed to generate heat in 1 kW. If the house is installed 10-kilowatt boiler, then per hour it will consume 1.2 m3 of gas. If you want to calculate the daily consumption, you have to use another formula with different parameters.
The burner in the boiler is not running 24 hours a day. the period of idle time and work is 50% each. So the fuel is spent 12 hours a day. Consumption for the day can be calculated by the following formula: Daily consumption multiplied by 12.
To find out how much the gas boiler consumes each month, you need to multiply the daily consumption by 30 (days in a month). For a 10 kW boiler the gas consumption for heating is 432 m3 (10 x 0, 12 x 12 x 30). This is a relatively simple formula for the calculation of the gas consumption.
What affects gas consumption
It is necessary to know the factors that affect gas consumption:
- Heat loss. In order to choose the correct capacity of the gas appliance you need to know the heat loss. The gas consumption per month is added up on the basis of this value. You can use the following formula for this. It is important to note that heat loss is greatly increased by cracks in the walls, as they cause drafts inside the house.
- Automatics. Boilers, powered by gas, have a special automation system and a timer to control the unit. Using such a system, you can make the most comfortable use of the heating system, as well as self-control the flow of gas boilers or even reduce.
- Condensing boiler. Compared with a standard gas boiler condensing boiler will consume much less gas. It uses the heat generated by the condensation of water vapor. Thermal characteristics of this type of equipment are very high, and the design allows the rational use of all available characteristics. The liquid that goes into the boiler is heated by the gas treatment, and then additionally heated by the gas burner. Of course, the condensing boiler is more expensive than a gas boiler, but it saves fuel by 20%. Therefore, all the investment will be recouped.
How to reduce gas consumption
If the final indicators of gas consumption are not satisfied with the household, you can try to reduce them. The preservation of the family budget will depend on it.
Gas boilers are rarely bought in an apartment. This is due to the fact that the installation is quite complicated, but sometimes the unit is necessary.
A city dweller in such a case should take care of some nuances to reduce gas consumption as much as possible:
- Very high quality insulation of the facade. This is especially useful if the apartment is in a corner.
- At the store to clarify all the parameters of the boiler in advance and pick up a more economical option.
- Install PVC windows with multiple levels of insulating glass in the house. So the heat will not go outside the room and the gas boiler will not “heat the street.
If well insulated and sealed the room, you can save up to 60% on heating.
Boilers are usually purchased for installation in a private house or cottage. There the unit can be connected to the heating system or even the swimming pool.
In a private home, you also need to comply with the nuances to reduce gas consumption:
- Set the meter. If a private house or cottage does not have time to monitor the consumption of the boiler yourself, it is desirable to install a special control meter and record the readings. Gas consumption will depend on weather conditions, and therefore the data may seem tentative. But after about a year of regular records will be able to draw the right conclusions about the attempts to save money. If the figures indicate excessive flow, you need to make sure that the heat does not leave the house.
- Qualitatively insulate the room and eliminate any cracks and chips in the walls. First of all it is necessary to take care of the attic, roof, basement, technical rooms and facade. In other words, it is necessary to seal the weak areas of the private house through which heat escapes to the street. An additional advantage. there will be noise insulation. This is especially important if the house is located close to the road.
Rational variant of installation of the boiler in a private house:
- Floor equipment with a built-in cast iron heat exchanger with the correct capacity specifications.
- Installation of an indirect heating boiler with enough liquid inside.
- Install a programmer and thermostat to control the operation of equipment depending on the schedule and time of day.
It is important to note that cast iron heat exchangers are extremely durable. They will function for 20 years or more, and therefore do not need to be replaced. Floor standing types of boilers are desirable because of the ease of maintenance. In addition, two-circuit units will be ineffective if the total area of the room will be more than 100 square meters.
To reduce the capacity of boilers of this brand is more effective, if you reduce the fuel supply to the burner. To do this reset the gas valve.
For example, we took the model of Protherm Gepard.
This is where the Honeywell valve is used. Externally this is a yellow connector with wires. It is mounted on a stepping motor that helps change its settings.
This motor is controlled via the control panel: You must enter the service menu. Access to it appears after entering the code.
- Press and hold the “Mode” button for 6-7 seconds. On the display you will see the number 0.
- Use the or. keys to enter the number 35. This is the code. Press this button again.
- When the first line of the menu with the 0 symbol appears on the screen, also use the or. button to enter the digit of the required line number: d
- Change the parameters. Press “Mode” again. This is the transition from line numbering to the indicators themselves. The “=” symbol and the output parameter are displayed alternately on the screen. Change the setting by using orAfter 3 seconds the new setting is automatically confirmed.
- Return the display to its original state: press “Mode” for three seconds. After 15 minutes the screen will return to the function mode by itself.
What you need to reduce the gas consumption of the boiler for heating
The task of the heating system is to maintain a comfortable temperature in the house. For this purpose, the thermal energy that is released during the combustion of gas in the boiler is constantly spent to compensate for the heat loss of the house.
The gas is consumed to replenish the heat losses in the house:
With hot water drains into the sewer. Losses in the heating system itself.How to reduce high gas consumption and heat losses associated with the heating system
In this article we will consider how to reduce heat loss associated with the operation of the heating system. How to reduce the high gas consumption of the boiler for home heating.
The heating boiler in a private home most often serves as source of heat energy for two heat consumers:
Heat consumption of the heating system
The heating system makes up for the heat losses of the building and maintains a comfortable room temperature. Heat consumers in the heating system of a private home are usually the circuits with radiators and underfloor heating.
The heating system does not consume heat energy all year round, but only during heating periods. And, the amount of energy consumed is not constant, but depends on the fluctuations in ambient temperature during the heating season.
Thermal energy for heating is constantly consumed, but the amount of energy consumed is constantly changing. The maximum amount of energy consumed can differ from the minimum consumption by a factor of ten or more.
Based on the above, the ideal source of thermal energy for the heating system in a private home must meet the following requirements:
- Produce heat energy constantly, without interruptions.
- Have the maximum capacity, sufficient to compensate for the heat loss of the house in the lowest temperatures of the outside air.
- Have the ability to regulate the amount of thermal energy produced from the maximum to the minimum, varying by a factor of 10 or more.
It should be noted that ideal heating boilers that meet all these requirements are not available on the market.
My gas consumption is high and my neighbor’s is low. What to do?
You should not compare your gas consumption with what your neighbor says. It doesn’t matter what anyone says. Miracles don’t happen.
Think about where the heat that is produced in the boiler burner during combustion of gas can go? The heat from the boiler can go only to the heat exchanger and then to the heating system or with the flue gases to the chimney and outdoors.
How can you compare the gas consumption today and yesterday, if the weather (temperature, wind) is always different?
House designs are also different. Maybe your home is losing more heat than your neighbor’s due to, for example, using a thinner insulation layer on the ceiling. Have you seen the thickness of your neighbor’s insulation??
Perhaps your neighbor’s boiler is controlled by a room thermostat and keeps a lower temperature in the house than you do?
Or maybe his ventilation works differently.
heat goes down the chimney if the boiler’s primary heat exchanger is clogged with soot, scale and rust on the outside. on the inside.
Gas consumption increases if there is low pressure in the gas pipe or if the gas supply is of poor quality.
There can be many reasons. And most likely, your neighbor is just a braggart and wants to show his superiority.
To reduce the consumption of gas have to act on many fronts, bit by bit to reduce consumption.
Gas consumption depends on the thermal protection of the house, on the temperature outside, on the efficiency of the boiler, on the accuracy of maintaining the temperature in the room. Boiler operation at minimum output, cyclic operation. all this reduces the efficiency of the heating system.
Choose an economical gas boiler
Building regulations do not recommend installing boilers with a useful capacity that significantly exceeds the capacity of the heating system in the house or apartment.
For example, in the service manual of the two-contour boiler Protherm Gepard 23 MTV indicated its efficiency in heating mode: 93.2% at maximum thermal capacity (23.3 kW).) and 79.4% at minimum output (8.5 kW.) Imagine how much lower the efficiency would be if this boiler had to work with a heating system with an output of e.g. 4 kW.
Note that the heating boiler during the year most of the time working at minimum output. At least 1/4 of the gas used for heating will literally fly uselessly into the pipe. This will be payback for installing too powerful equipment for heating and hot water in the house.
Impulse operation, boiler clocking
The large difference between the capacity of the gas boiler and the capacity of the heaters, among other disadvantages, leads to the boiler working in pulse mode.
Excessive cyclic, impulsive operation, or as they say, “boiler churning” is manifested in the fact that the boiler produces more thermal energy per unit time than a less powerful heating circuit can take. Therefore, the water temperature at the outlet of the boiler rises quickly and it shuts down before it has time to heat the radiators.
The boiler burner switches off quickly after reaching the set temperature in the straight pipe at the boiler outlet. But the radiators remain unheated to this set temperature. the water heated in the boiler has simply no time to reach the radiators.
After a short time the circulating pump supplies the heat exchanger with the remaining cool water from the return pipe of the heating system, and the burner starts again. Then everything repeats again.
Tacting reduces the life of the boiler and increases gas consumption
The increased number of starts as a result of cyclicity, eats most of all the life of very expensive parts of the boiler. gas and three-way valves, circulating pump, flue gas fan.
For ignition at the moment of start-up, the burner is supplied with the maximum amount of gas. Part of the gas, before the flame appears, literally flies into the pipe. Constant “restarting” of the burner further increases gas consumption and reduces the efficiency of the boiler.
Work in “clocking” mode significantly reduces the life of the boiler parts, significantly reduces the efficiency.
Many manufacturers produce dual circuit gas boilers with a maximum output of about 12 kW. and the minimum power of less than 4 kW. Such boilers are best suited for heating and hot water systems of small private houses and apartments. However, the amateurish approach. the more powerful, the better, makes many boilers with a capacity of 24 kW, or even 30 kW.
For preparation of hot water and heating homes and apartments with heated area of 120 m2, with one bathroom, I recommend installing double-circuit gas boilers with a maximum capacity of 12 kW.
A boiler with a domestic hot water boiler reduces gas consumption
The system of heating and DHW with a two-circuit gas boiler is popular due to its relatively low cost, simplicity and small size. However, it has significant drawbacks that lead to increased gas and water consumption, reducing the comfort of using hot water.
Wall mounted gas boiler with a boiler. the best option for the organization of heating and DHW in a house or apartment.
For houses and apartments of large size, with an area of more than 120 m2, I highly recommend using a system of DHW with a layer heating boiler and double boiler, or with a boiler with indirect heating and single-circuit boiler.
A gas boiler with an open combustion chamber saves gas
Compare the efficiency of gas boilers of the same capacity and brand, but with different types of combustion chamber, with an open combustion chamber (atmo) and with a closed (turbo). You will find that atmo boilers have a higher efficiency than turbo boilers.
In turbo boilers, as a result of constant fan operation, an excessive amount of air escapes through the combustion chamber and further into the chimney. And with the air, you lose heat and increase gas consumption.
In addition, in turbo boilers we have an additional power consumption for the operation of the fan in the smoke evacuation system.
In a private home, it is advantageous in advance, at the stage of construction, to provide for the device of the chimney for a gas boiler atmo with an open combustion chamber.
To increase the efficiency of turbo boilers, some manufacturers equip the boiler with a modulating turbocharger system. The fan of such a boiler changes its rotation speed according to the signal of the sensor. As a result, exactly as much air is supplied to the combustion chamber for burning the amount of gas supplied to the burner. No lack or excess of combustion air minimizes heat and gas loss through the smoke evacuation system. Modulated turbocharging is usually equipped with luxury category boilers.
Proper air supply and smoke evacuation reduces gas consumption
12÷14 m3 of air? For example, a 18 kW boiler at a rated gas consumption of 1.93 m3 /h will require combustion air
In the mode of lack of air for combustion, not the complete combustion of the air-gas mixture takes place. This mode leads to a sharp decrease in the amount of heat released during combustion and intensive formation of soot. Soot settles on the heat exchanger and can in a short time completely clog the gaps between the plates of the heat exchanger fins.
Incomplete combustion of gas reduces heat generation, and soot contamination of the heat exchanger makes it difficult to transfer the heat from the burned gas to the heating water in it. All this leads to an increase in gas consumption by the boiler.
The excess air flowing through the boiler burner uselessly takes away with it and carries away into the chimney part of the heat, which also increases gas consumption.
In order to reduce gas consumption, it is necessary to ensure that the boiler is supplied with the optimum amount of combustion air.
Properly make the air intake/flue gas venting and flue gas venting system, and have it serviced in a timely manner.
Defects in the system may go unnoticed by the owners for a long time, but all the while will increase gas consumption.
In the operation of the heating must be done annually, before the heating season:
Check the chimney for tightness of seams and joints, for compliance with the recommendations of the manufacturer of the boiler its length and diameter, for absence of obstacles in the chimney (clogging, icing), for blowing and draft support by wind (for position of the head of the chimney relative to the roof).
Check the free flow of air to the boiler burner.
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On the boiler burner, when there is a shortage of air, the flame turns reddish-yellow.
For adjustment and control of the burner and the gas exhaust duct of the boiler, it is convenient to refer to the readings of the gas analyzer that measures the excess air in the combustion products of the boiler operating at maximum power.
Optimal combustion parameters are achieved at excess air ratio values of about 1.7-1.8. Values of the excess air ratio above 1.8 indicate that an excessive amount of air is flowing through the boiler.
The correct ash pan and chimney of gas boiler atmo
Gas boiler with an open combustion chamber. atmo, takes air for combustion directly from the room in which it is installed. Air is sucked into the combustion chamber of the boiler due to the rarefaction created by the force of the draft in the chimney. The worse the draught in the pipe, the less air is supplied to the burner.
Gas boilers with an open combustion chamber and natural smoke extraction are equipped with a thermostat to control the flue gas exhaust to the room. The thermostat switches the boiler off when the combustion gases start to enter the room as a result of insufficient draft in the chimney.
If the thermostat trips, the boiler is blocked and a corresponding error message is displayed (see the instructions for the relevant boiler model). Instructions for the relevant boiler model). Manual unblocking of the boiler must be carried out not earlier than after 10 min., When the thermostat cools down.
The room in which the boiler is installed, you must ensure a constant supply of air. The main consumers of air are the exhaust duct for room ventilation and the burner of the gas boiler atmo, which takes in the combustion air directly from the room.
A distinction is made between INDEPENDENT air supply (through air inlets from the street) and INDIRECT air supply (through air inlets from an adjacent room).
To ensure sufficient combustion air, the air intake systems must be designed according to certain rules.
Direct air supply from the street is performed if the boiler is installed in a separate isolated room. In the boiler room, where the boiler atmo is installed, there must be an air intake from the street of at least 8 cm2 per 1 kW of boiler output. But in any case, the area of the opening must be at least 200 cm2. Openings are placed in the outside wall or outside door.
The air inlet in the boiler room from the street must be located as low as possible, not higher than 300 mm. from floor level. This is a prerequisite for a LPG-fired boiler. If natural gas is used and it is not possible to place the opening near the floor in the lower area of the room, it can be made higher, but the usable area must be increased by about 30÷50%.
On the hole must be installed grid that does not reduce its useful area.
Indirect air flow from the adjacent room may be implemented for a gas boiler atmo with a maximum capacity of 30 kW when the boiler is installed in the economic room of the house.
In this case, the combustion uses air that enters the house through the general ventilation system of the building. A chimney boiler, along with the removal of smoke, serves as an additional exhaust ventilation channel, which enhances air exchange in the house during the operation of the boiler.
For the intake of air into the room with the boiler from the adjacent rooms (corridor, hall) is arranged air intake. The area of the opening shall be determined on the basis of 30 cm2 per 1 kW of boiler output. This can be a vent in the wall or door, or just a slot under the door.
It is categorically unacceptable to install a boiler with an open combustion chamber in the room where there can be a rarefaction as a result of forced ventilation devices. duct fans, kitchen hoods. Operation of such devices can result in a shortage of combustion air, a back draft in the chimney, and a shutdown of the boiler.
Check that the fresh air supply to the house is properly arranged for the ventilation system. This air is also used to burn gas in the boiler atmo.
Chimney of a boiler with open combustion chamber. Boilers with an open combustion chamber must be connected to an existing chimney in the building with natural draught.
The boiler manufacturer usually specifies the chimney requirements in the instructions accompanying the boiler.
Atmo boiler chimney must meet the following basic requirements: