| CLAIMS 1. Gas consumption reducing device, for independent gas-fired heaters, primarily for gas convectors and gas-fired fireplaces, which has an operator device, a clack-valve controlling the combustion air flow, and a multipositional gas tap with shutter, characterized in that in all positions the gas quantity is set by calibrated gas by-pass openings (14, 15) and a calibrated injector (19), the shutter (2) of the multipositional gas tap (1) is connected to the moving device (5) of the clack-valve (4) controlling the combustion air (3) flow in a correlated manner, and the position of every clack-valve (4) working with the gas tap (1) is associated with corresponding calibrated gas by-pass capacity. 2. The device according to claim 1, characterized in that at least one calibrated gas bypass opening (14) is located in the gas tap (1). 3. The device according to claim 1, characterized in that it has a gas tap (1) with various outputs, and that the calibrated gas by-pass openings are attached to the pipe sidings connected to the various outputs. 4. The device according to any of the claims 1 to 3, characterized in that the gas tap (1) has one or more outputs, and that the shutter (2) of the gas tap (1) is a rotating shutter, and is in a fixed cooperative connection with the opening and closing moving device (5) of the clack-valve (4) controlling the combustion air flow. 5. The device according to any of the claims 1 to 4, characterized in that to the gas tap (1) position providing the lowest gas load corresponds the lowest free cross section position of the clack-valve (4) controlling the combustion air (3) flow, while to the gas tap (1) position providing the highest gas load corresponds the highest free cross section position of the clack-valve (4) controlling the combustion air (3) flow. 6. The device according to any of the claims 1 to 5, characterized in that the a gas tap (1) , preferably with rods (27), is in mechanic forced connection with the opening and closing moving device (5) of the clack-valve (4) controlling the combustion air (3) flow. 7. The device according to any of the claims 1 to 5, characterized in that the shutter (2) of the gas tap (1), preferably connected with cog wheels (33) and cog wheel rods (34), is in indirect mechanic forced connection with the opening and closing moving device (5) of the clack-valve (4) controlling the combustion air (3) flow. 8. The device according to any of the claims 1 to 7, characterized in that the gas feed opening (13) is calibrated. 9. The device according to any of the claims 1 to 8, characterized in that it has a rotating shutter (2), which is empty inside and is preferably cone shaped, fitted to the inside wall of the gas tap (1), and there are the first, second, third, and ηΛ gas distribution chambers (8, 9, 10, n) on the surface (7) thereof, and the empty section (11) of the rotating shutter (2) is connected to the gas input opening (12) and to one, preferably the first gas distribution chamber (8) through the gas feed opening (13), and the first gas distribution chamber (8) is connected to the second gas distribution chamber (9) through the first gas by-pass opening (14), which has a lower throughput capacity, than the gas feed opening (13), and the third gas distribution chamber (10) is connected to the second gas distribution chamber (9) through the second gas by-pass opening (15), which has a lower throughput capacity, than the first gas by-pass opening (14). 10. The device according to any of the claims 1 to 9, characterized in that there is a thermostat (29) controlled thermostat valve (28) controlling the required temperature built into the gas line (20) running from the gas tap (1) to the injector (19) of the main burner pipe (18) in the combustion chamber (17) of the gas-fired heating device, and that the gas tap (1) has a shutter (2) supplying gas for the ignition burner (22) and an ignition burner supply pipe (16) supplying the ignition burner (22). 11. Any of the claims 1 to 10, characterized in that in the closed position of the operator device (6) of the gas tap (1), the clack-valve (4) blocks the entire cross section of the output opening. 12. The device according to any of the claims 1 to 10, characterized in that the gas input opening (12) of the multipositional gas tap (1) is connected to the gas output (31) of a multifunctional unit (30), which has a gas shortage controller, an ignition burner (22) lighter, ignition burner supply pipes (16), and a thermostat valve (28) set to the required temperature and a thermostat (29) connected to it. 13. The device according to any of the claims 1 to 9, characterized in that the operator device (6) is connected to an electronic rotating device controlled by the signals of an indoor thermostat, which, in the controlling function of the thermostat, can set the operator device (6) at the required performance level corresponding to the heat demand. |
The subject of the invention is a gas consumption reducing device for independent gas- fired heaters, primarily for gas convectors and gas-fired fireplaces without combustion products ventilation, which has an operator device, a clack-valve controlling the combustion air flow, and a multipositional gas tap with shutter. The device according to the invention by the reducing of the quantity of unused combustion air is especially suitable for reducing the gas consumption of gas convectors in living rooms, and in middle and small sized rooms in a simple and cheap manner. The solution according to the invention - unlike already known solutions - is safe, because there is no need to use locally adjustable parts, thereby avoiding unauthorized interference with the operation of the device by - for example - the consumer or any miscalibration of the device, that may cause serious accidents or even death. Another feature of the device according to the invention with a safety increasing effect is that - due to the direct and forced connection between the quantity control of combustion air and gas - no moving parts can get jammed in a manner that would distort the appropriate gas-air ratio, which would give rise to the risks of accidents and the consequences thereof as described above. In the solution according to the invention, the gas quantity corresponding to the respective clack-valve position is set by an injector or injectors with fix bore - instead of adjustable bores -, thus the device ensures the appropriate gas-air ratio without any calibration at all performance levels. The efficiency of independent gas-fired devices equipped with this device is significantly higher at the reduced performance level of the device - which is the dominant part of the operating period -, than at nominal load, while the efficiency of known devices at the reduced performance level is lower, than the efficiency measured at the nominal performance level of the device.
It has been known for a long time that in order to achieve good heating efficiency in closed spaces - in the combustion chamber of heaters - the ideal burner and combustion air ratio would need to be continuously adjusted and kept at the precisely calculated value. This is nearly impossible to achieve in independent household heaters burning solid materials, because the ad hoc required combustion air quantity is unknown and, even if it were known, the users would not be able to calibrate the quantity precisely. Thus, usually the combustion air quantity in the combustion chamber is controlled with common sense, using the openings on the door. In lucky cases, fired heaters are operated with large quantities of excessive combustion air and with a draught, thereby overheating the combustion chamber, to avoid the appearance of the poisonous carbon monoxide by throttling down the combustion air. Nevertheless, the achieved efficiency level is far from the optimum. While the necessary combustion air quantity for various gas loads in independent gas-fired devices can be specified by measurements, there have not been known, low-cost, and safe solutions that could be produced at an acceptable price level for this device category. Industrial consumers take good care to measure the main parameters of their fired devices due to the current expensiveness of energy resources, and often use complicated systems for continuous adjustments to achieve optimal efficiency. Retail consumers, however, cannot afford expensive solutions, not for the gas convectors of retail consumers. Simpler solutions have been known for some half a century, such is the Hungarian patent No. HU 142 805 "Directly operating ratio controller". According to the patent description, this device would be theoretically capable of setting the gas/air ratio for various gas-fired heaters. This solution controls the incoming flow of secondary air or gas with a membrane or slide- valve operated by the primary gas flow pressure, and the keeps adjusting the two membranes until equalizing the primary and secondary pressures. However, such a solution cannot be used for gas convectors. In gas convectors, the combustion air and the combustion products are not flowing because of a ventilator, but due to gravitational draught, and the resulting minimal effect on the pressure difference on the membrane would render the device practically unfeasible.
Gas heating became common in Hungary by the '60s of the last century, and the most simple heating method - which is still in use - was the gas-firing of tile stoves. However, attempts were made even in those early days to optimize the gas/combustion air ratio. Such a solution is presented in the Hungarian patent No. HU 159838 "City gas or natural gas fired burner, primarily for heating tile stoves". The triplex combustion air disc controller in this patent is in forced connection with the gas feeder. The disc - by opening the gas feeder - opens the two air input openings proportionately to the gas feed, thus achieving the appropriate gas/air mix in the combustion chamber. The appropriate gas and combustion air ratio, according to this patent, is set by moving and setting to the appropriate position of the semi-cylinder and the covering plate. The heating performance, which depends on the quantity of the outgoing gas, and the size of the gas flame depends on the rotation and position of the controlling gas tap; however, this device is designed for independent and local adjustment, when both the gas and air quantity is controlled and the ad hoc varying chimney draught - which has a direct effect (as there is no flow control) on the gas device only in case of gas-fired tile stoves - could have been compensated to a certain extent. On the other hand, solutions necessitating independent adjustment cannot be used at the time of mass produced gas convectors of our times. This is true for safety technical and economic reasons: during the production and placing into operation of gas convectors, in order to realize savings, only solutions are and can be used, that do not require in any way that the device is adjusted, meaning that all manufactured parts of the device would need to be adjusted, preferably with a combustion products analyzer. These heating devices are usually assembled by semi-skilled workers, who are not capable of performing such tasks, and the necessary adjustment would be hard to put on the schedule of assembly line based production methods. Besides, the gas device need to be delivered to the consumer precisely set for a specific kind of gas. In average, the correct burning (including the appropriate gas/combustion air ratio) of only one device in 500 mass produced devices is checked and measured by statistical methods; even this stage means verification, but not adjustment. Devices necessitating individual adjustment would be extremely costly in the lowest cost category of gas devices. The possibility of local adjustment also raises concerns of unauthorized access by the consumers, thus relevant provisions prohibit any adjustments of this kind; such solutions may be applied that can be assembled in one way only, and any misassembly in an incorrect position would require "exceptional force". In gas burners used by large industrial consumers - such as the Maxon Co. „Micro-Ratio" Valve or the GB-Ganz SGB-350 series automatic gas burners - the input combustion air controller is connected to the gas tap and is continuously set to achieve the optimal gas/combustion air ratio. In such cases* the quantity of surplus combustion air in the combustion chamber is negligible. However, this solution is not fit for independent and small gas-fired heating devices due to the high production costs and the adjustment requirements including all and any parts of the device. There are also known procedures achieving the most advantageous burning conditions by using systems involving CO measurement. Such an invention is the Hungarian patent description No. HU 205 649. Such CO measurement based solutions are the most expensive solutions, thus they cannot be applied in low-cost device categories.
In cases of known gas convectors and gas-fired fireplaces, the combustion air - gas mix is created using the main injector in the main burner and the outcoming gas as well as the primary combustion air occluded from the environment, and this mix is burnt by the gas burner row located on the surface of the main burner pipe in the combustion chamber of the gas convector. In the combustion chamber (with the exception of total air pre-mixing burners), the secondary air required for burning and surplus air is also necessary. The gas quantity ratio compared to the primary, secondary, and surplus air defines the surplus air in the combustion chamber of the device. Setting the appropriate gas/combustion air ratio in the combustion chamber is ensured during designing the gas convector by using flow resistance scaled to the lifting force generated by hot combustion products and appearing as chimney draught like gravitational pressure difference, which flow resistance is the sum of the various flow resistances appearing in the combustion products and combustion air pipes of the device. The combustion products side flow resistance of gas convectors is usually specified by the exact size of the free cross-section of the combustion products flue outlet. This free cross-section is adjusted to the maximum capacity of the device. The total load usually appears rarely and only for a short time period, thus the gas convector operates at reduced load and with unjustifiably excessive combustion air in most of its working period - due to the selected combustion products side flue cross-section -, which combustion air leaves through the combustion products flue outlet with the combustion products. The large quantities of unused air, which was also heated in the combustion chamber, only unnecessarily cool the combustion chamber, thereby reducing the efficiency of the device. The primary task of the invention is not to set the most advantageous combustion air/gas ratio in the main burner pipe, but to reduce the quantity of unused combustion air entering the combustion chamber, in order to increase its efficiency by a simply feasible and cheap solution.
It is quite common that far larger - sometimes double sized - gas-fired heaters are used than required for heating certain rooms, because designers take precautions to avoid complaints about insufficient heating performance and tend to select devices with higher performance than necessary, due to the heat demand scaling uncertainties of individual rooms. This is exceptionally common for independent gas-fired heaters and gas convectors. Consequently, gas-fired heaters run at reduced load in 95% of the operation time, while being turned on and off regularly. Besides, when turned off, the required quantity of combustion air is zero, beyond the necessary quantity to keep the ignition burner running. Without controlling the combustion air quantity, unjustifiably high quantities of combustion air flow through the combustion chamber of the gas device, thereby cooling the device. For this reason, the efficiency of known gas convectors significantly reduces with the performance reduction, especially in the most common working state.
The invention is based on the recognition that in case we are able to reduce the excessive combustion air quantity in the common working state, we can realize significant, approximately 20% reduction in gas consumption. A quite simple realization method is to build a shutter device, a clack-valve into the air-combustion products flue outlet or opening of the combustion chamber, the closing plate of which is in forced connection and rotated along with the gas tap performance controller operator device. This way we successfully minimize the combustion air surplus, when setting lower heating performance on the device. The solution according to this invention - beyond simplicity— also has safety related effects, since the combustion air closing device, the clack-valve, is in mechanic, directly forced connection with the performance controlling gas tap. Thus, it is not possible to open the gas tap independently, when the combustion air shutting clack-valve is blocked because of any alien body - such as a spider - entering the device.
The most general embodiment of the invention is described among the characteristics of claim 1. Claims 2 to 13 describe the advantageous embodiments of the gas consumption reducing device.
The gas consumption reducing device according to the invention is presented in detail on drawings, where
Figure 1 shows the gas consumption reducing device according to the invention mounted on a gas convector,
Figure 2 shows the "A-A" section drawing of one embodiment of the gas tap 1 presented on Figure 1 fitted with the rotating shutter 2,
Figure 3 shows the gas convector mounted with the gas consumption reducing device according to the invention fitted with thermostat controlling,
Figure 4 shows the gas consumption reducing device according to the invention in forced connection through cog wheels,
Figure 5 shows the embodiment of the gas convector mounted with the gas consumption reducing device according to the invention with a thermostat controlled multifunctional unit,
Figure 6 shows the diagram presenting the gas load and heating performance corresponding to the various angle positions of the rotating shutter of the multipositional gas tap presented on Figure 1 and Figure 2.
Figure 7 shows another possible gas load and heating performance diagram of the gas consumption reducing device presented on Figure 1.
Figure 1 shows the schematic sketch of the inside of a modified gas convector according to our invention and mounted with the gas consumption reducing device. The drawing presents certain important parts of the gas convector, primarily the parts that are essential for describing the operations of our device. The combustion air 3 enters the combustion chamber 17 through the input opening 25 of the gas convector, which is delimited by the combustion chamber wall 24. Most of the combustion air 3 goes into the main burner pipe 18 and is mixed with the high pressure gas coming from the injector 19, and is subsequently burnet on the gas burner row 21 located on the main burner pipe 18. The surplus combustion air 3 is mixed with the combustion products and leaves the device through the output opening 26. The combustion air 3 input opening 25 and the output opening 26 of the gas convector is sized in a manner allowing - even when feeding the maximum gas quantity - sufficient combustion air 3 flowing through the combustion chamber 17 and being available in the main burner pipe 18 to ensure the gas/combustion air ratio achieved in the known manner. However, gas- fired heating devices operate at reduced load with the gas tap 1 being set to the low position in 95% of their working time. In such cases, the combustion air 3 flows through the input opening 25 and the output opening 26 and the combustion chamber 17 in unnecessarily high quantities, thereby unnecessarily cooling the combustion chamber wall 24 and the entire gas convector. For this reason and in order to control the flowing combustion air 3 quantity, we build a combustion air 3 controlling clack-valve 4 into the flue outlet of the gas convector - in the embodiment according to this example - at the combustion air 3 output opening 26 of the gas convector, and equip the gas convector with a multipositional gas tap 1, which can be moved accordingly. The "A- A" section drawing of the gas tap 1 is presented on Figure 2 and, in the shutter 2 - in this embodiment - is a rotating shutter 2. According to our invention, the shutter 2 of the multipositional gas tap 1 is in correlated movement connection with the moving device 5 of the clack-valve 4 controlling the combustion air 3 flow, and varying clack-valve 4 positions correspond to each set position of the multipositional gas tap 1. The shutter 2 of the multipositional gas tap 1 is in mechanic forced connection through the rod 27 with the moving device 5 of the clack-valve 4 and with the operator device 6. In most cases, the operator device 6 is a simple operator button. To the extent the gas tap 1 is opened with the operator device 6, the clack-valve 4 built into the throat of the output opening 26 is opened to the same extent. This controls the outflow of the unused combustion air 3 mixed with the combustion products and indirectly prevents the inflow of unnecessary and cold combustion air 3 into the gas convector. The smallest open position of the clack-valve 4 controlling the combustion air 3 corresponds to the smallest open position of the gas tap 1, and vice versa. The quantity of unused combustion air 3 can be controlled anywhere inside the combustion chamber 17 or close to the input opening 25, but - according to the invention, there must be mechanic forced connection between the gas tap 1 controlling the gas quantity and the clack-valve 4 controlling the flow.
In the embodiment presented on Figure 1, the gas 32 supply for the gas tap 1 comes through the gas input opening 12. The gas 32 goes from the gas tap 1 through the gas line 20 into the main burner pipe 18 and through the ignition burner supply pipe 16 to the ignition burner 22.
Figure 2 presents an embodiment of the multipositional gas tap 1 with rotating shutter 2. On Figure 2 there are three gas distribution chambers - the first gas distribution chamber 8, the second gas distribution chamber 9 and the third gas distribution chamber 10 - on the surface 7 of the rotating shutter 2. Other details of the gas tap 1 and other known parts supplying gas 32 for the ignition burner 22 are not presented on this figure. Thus, in this embodiment, the gas tap 1 has five positions.
The gas 32 is laid from the gas input opening 12 on the middle empty section 11 of the cone shaped rotating shutter 2, and from there it enters the first gas distribution chamber 8 through the gas feed opening 13. The gas 32 flows from the first gas distribution chamber 8 into the gas line 20 through the fully opened tap. However, the gas 32 also enters the second gas distribution chamber 9 from the first gas distribution chamber 8 through the first gas by-pass opening 14, and keeps flowing through the second gas by- pass opening 15 into the third gas distribution chamber 10. If there are several η Λ gas distribution chambers n, the gas 32 is tunnelled from one chamber into the other in this way. The multipositional gas tap 1 has as many positions - in addition to the fully shut position and the position feeding the ignition burner - as many gas distribution chambers there are in the device. The number of gas distribution chambers is limited by the number of chambers that can be reasonably fitted onto the surface of the shutter 2 and by the number of the selected gas tap positions. For each gas tap position, the gas 32 goes into the gas line 20 from the respective gas distribution chamber, which it is facing at the moment. The gas throughput capacity of the gas feed opening 13 is to be sized to the highest nominal performance, while the other gradually decreasing gas bypass openings 14, 15, n are to be sized according to the reducing performance level corresponding to each levels. The gas quantity corresponding to each position of the clack-valve 4 controlling the combustion air 3 flow is defined by the pre-defined consecutive gas by-pass injectors - that are, in our embodiment, connected subsequently each other - built into the gas tap 1. This way each clack-valve 4 position is if it were connected to another gas convector with lower nominal performance, than the previous one. However, the smaller nominal performance levels belong to the combustion chamber wall 24 with the original heat transmitting surface, thereby improving the performance/heat transmitting surface ratio, thereby increasing efficiency. On the other hand - and unlike in already known solutions -, the gas-air ratio remains optimal at this lower performance with our solution, unlike in the case of other known solutions, where the surplus air quantity increased at lower performance levels and reduced the efficiency of the device by 10-20%, in comparison to the efficiency measured at nominal load. Thus, in the embodiment according to our solution, smaller nominal performance induces higher efficiency, while in the case of other known solutions, reduced performance levels induce efficiency levels, that are below nominal efficiency. This way we have achieved more advantageous efficiency, especially more advantageous annual efficiency.
The operation diagram of a device with three performance levels is presented on Figure 6. The horizontal R coordinate of the diagram shows the position of the gas tap 1 expressed in degrees, while the vertical L coordinate shows the corresponding gas load expressed in percentages of the nominal performance. The -90 degree position represents the switched off state of the device. The -45 degree position is the ignition burner position of the device. The 0 degree position is the nominal performance setting, the +45 degree position represents 60% load of the device, while the +90 degree position represents 30% load of the device. As described above, the clack-valve 4 is fully opened, when the gas tap 1 is in the 0 grade position, while it is in the most narrow position, when the tap is in the +90 degree position, which is necessary for ensuring the optimal combustion air 3 quantity for 30% load.
Another possible operation diagram of a device with three performance levels is presented on Figure 7. According to the diagram on Figure 7, the multipositional gas tap shutter 2 and the clack-valve 4 attached thereto in a forced connection, by operating the operator device 6 of the gas tap 1, move within the 0 degree and +90 degree range toward higher performance levels rotating in a counter-clockwise direction starting from the closed position. Unlike as shown on Figure 2, the allocation of the chambers 8, 9, 10 on the shutter falls on the mantle segment of the shutter 2 covering the 90 degree range, when the gas tap is closed. In this case, the 0 grade (fully closed) position corresponds to the fully closed position of the clack-valve 4, which fully closes the output opening 26 in the embodiment s presented on Figures 1, 3 and 4. In case of the embodiment according to Figure 5, when the gas tap is in the fully closed position, the clack-valve 4 is not fully closed, but provides sufficient combustion products throughput to keep the ignition burner working, because - in this case - the gas supply for the ignition burner does not arrive from the gas tap. In certain partially blocked positions of the clack-valve 4 (the interim positions between 0 degree and 90 degree of the operator device 6 - showing as examples 50% and 75% gas load on Figure 7) the gas load reduces according to the gas throughput capacity of one or more gas by-pass opening(s) 14 (15). In its position corresponding to the nominal gas load of the gas tap (90 degree), the output opening 26 is fully open. Thus, an additional advantage of the device is that the switched-off gas device does not cool the apartment, because the combustion products flue outlet is also closed, when the gas tap is in the closed position and, consequently, the outdoor air - which is colder, than the indoor air - cannot circulate in heat exchange, unlike in the case of known gas convector, thereby saving significant energy.
Figure 3 shows the gas convector mounted with the gas consumption reducing device according to the invention and presented on Figure 1 is fitted with a temperature controlling gas valve, also known as a thermostat valve 28. This is because state of the art independent gas-fired heaters, gas convectors and gas-fired fireplaces are inconceivable without thermostat temperature controlling that can be set to keep the required temperature of the room. In its most simple form, the thermostat valve 28 is built into the gas line 20 between the injector 19 in the main burner pipe 18 and the performance controlling gas tap 1. The thermostat valve 28 is controlled by the thermostat 29. The thermostat 29 controlling the thermostat valve 28 is preferably equipped with a rotating button 35 for setting the required temperature.
Figure 4 shows an embodiment of the device according to the invention, where the shutter 2 of the multipositional gas tap 1 is in indirect mechanic forced connection with the closing and opening moving device 5 of the clack-valve 4 controlling the combustion air 3 flow through connecting cog wheels 33 and cog wheel rods 34. This solution variation is important, when there is no other way to implement simple mechanic forced connection between the gas tap 1 and clack-valve 4, due to the structure of the gas-fired heating device.
Figure 5 shows an embodiment according to Figure 1 of the device according to the invention, where the gas-fired heating device is fitted with an independent, known multifunctional unit 30, which has a gas shortage controller, an ignition burner 22 lighter, ignition burner supply pipes 16 and a thermostat valve 28, and a connecting thermostat 29. In this case, the gas input opening 12 of the gas tap 1 of the device according to our invention is supplied with gas 32 by the gas output 31 of the multifunctional unit 30. Another possible solution is that some of the gas 32 coming from the gas output 31 of the multifunctional unit 30 circumvents the gas tap 1. In this case, for example, 50% of the gas 32 goes directly into the combustion chamber 17, and the remaining 50% is controlled only. Another possible solution is that the gas tap 1 has several outputs, which are provided with gas in combinations according to the positions of the operator device 6, and from which the gas is channelled to the main injector 19 through separate pipes and a collector attached to these outputs. In such cases, the gas feed openings controlling the gas quantity may be located in these parallel connected gas pipes, instead of the gas tap. Otherwise, every other respect - including the operation of the device - remains unaltered in comparison to Figure 3. The advantageous effects of the invention remain also unaltered.
The greatest advantage of the gas consumption reducing device according to the invention - in addition to the 20% energy saving - is its simplicity. Also, the recommended mechanic forced connection is extremely reliable. For example, dead insect bodies or other unexpected obstacles cannot break the forced connection between the gas tap and the clack-valve, thus malfunction is not possible. Known gas-fired heating devices require only minor modifications to be capable of adopting the device. The device can be successfully operated without additional operating power, control electronics, air injector ventilators etc., which is an important aspect for gas-fired heaters. It can also produced by mass production and can be fitted or adjusted on the spot. The device according to the invention and in its embodiment presented on Figure 1 may also be added an electronic rotating device controlled by the signals of an indoor thermostat emitting multi-level signals corresponding to the heat demand of the room, which rotating device - in the "controlling function" and by following the diagram on Figure 7 - can set the operator device 6 in the angle position corresponding to the temporary heat demand of the room. According to the example presented on Figure 7, these positions may be the followings: ignition burner position (including the ignition position), 50% load position, 75% load position and 100% load position. Thus, temperature is automatically controlled by the device presented on Figure 1. The solution has the additional advantage that the device automatically controls the current performance of the device between the ignition burner position and the full load position, while the optimal clack-valve 4 position is associated with all and any available performance levels. Switching off the device or setting into ignition position is achieved by manual actions on the room thermostat, which also the switching on - meaning the setting of the "ignition position", "switched off position" and the "controlling function" - of the ignition burner.
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