JP4559944B2 - Electric floor heating system - Google Patents

Description

  The present invention relates to an electric floor heating system having a cord-shaped electric heater as a heat source.

  An electric floor heating system having a cord-like electric heater as a heat source is known. After placing the cord-shaped electric heater on the floor foundation, place the wooden flooring from above, or connect the wooden flooring integrally with the cord-shaped electric heater on the floor foundation. By placing it in the electric floor heating system. The cord-shaped electric heater is mainly supplied with electric power from a commercial power supply via a controller. The controller is provided with functions such as specifying a heating area, starting and stopping energization, setting a floor temperature level during steady operation, and detecting an abnormality (see Patent Document 1 and Patent Document 2). There has also been proposed a control device such as floor heating in which power supply control to the heater is performed by energization rate control according to the ambient temperature detected by the temperature sensor by the comparison control means (Patent Document 3, etc.) reference).

  In the above electric floor heating system, the setting of the floor temperature level is performed by controlling the energization rate to the cord-shaped electric heater. For this purpose, the controller normally includes an energization rate selection unit that selects an energization rate to the cord-shaped electric heater during steady operation, and a scale display unit that displays a scale corresponding to the selected energization rate. The user turns on the power switch of the controller at the start of use and operates the energization rate selection means to select an energization rate corresponding to a desired set temperature level in the steady operation mode. A scale (for example, M10 to M1) corresponding to the selected energization rate is displayed on the scale selection means.

  When the power switch is turned on, the start-up operation mode at the 100% energization rate continues for about 30 minutes, for example, and then switches to the steady operation mode at the selected energization rate (step Mi). The floor surface temperature becomes a set temperature level, and thereafter, the temperature is maintained. As described in Patent Document 3, in the case of controlling the energization rate according to the ambient temperature detected by the temperature sensor, the floor surface temperature can be adjusted in accordance with the change in the outside air temperature.

Japanese Unexamined Patent Publication No. 7-248122 JP-A-10-185222 JP-A-5-203168

  In the case of an electric floor heating system that uses a cord-like electric heater as a heat source and an energization rate control method as a control method for the floor surface temperature, after the floor surface temperature reaches the selected set temperature level, the temperature Maintained. However, when the set temperature level is high and the steady operation is continued at a power supply rate of about 100%, especially when the operation is performed for a long time of about 4 to 10 hours with no change in the outside air temperature, The floor surface temperature may rise to a temperature as high as 10 ° C.

  The general floor surface temperature of floor heating is said to be around 27 ° C. to 30 ° C. at the highest, and if the temperature rises as described above, the floor surface temperature may be as high as around 40 ° C. Such a temperature environment can impair the comfort of floor heating and cause low-temperature burns due to thermal blockage. Of course, an electric floor heating system is provided with a thermostat as a means for preventing excessive temperature rise, and the safety of the system is ensured, but the operating temperature of the thermostat is normally set to about 42 to 50 ° C. However, this phenomenon cannot be avoided with a thermostat.

  The present invention has been made in view of the circumstances as described above. In an electric floor heating system that uses a cord-like electric heater as a heat source and adopts an energization rate control system as a floor surface temperature control system, the outside air Even in a case where steady operation at an energization rate of about 100% continues for a long time in an environment where there is no change in temperature, it is possible to avoid the floor surface temperature from greatly rising beyond a preset temperature level selected in advance. An object of the present invention is to provide an electric floor heating system.

  Furthermore, the present invention, when continuing to operate so as not to increase the floor surface temperature greatly exceeding the preset temperature level selected in advance as described above, when the user intends to change the floor heating level to a lower one, An object of the present invention is to provide an electric floor heating system that can surely reflect a user's intention in operation.

  An electric floor heating system according to the present invention includes a cord-shaped electric heater as a heat source, an energization rate selection means for selecting an energization rate to the cord-shaped electric heater during steady operation, and a scale corresponding to the selected energization rate. An electric floor heating system including at least a controller for displaying a scale, and the controller further includes a timer means for monitoring an elapsed time after the energization of the cord-shaped electric heater is started. And an energization rate reducing means for automatically reducing the energization rate by a predetermined value ΔPx when a time t preset by the timer unit elapses, and under a situation where the operation rate is automatically reduced and operating. When the user operates the energization rate selection means and selects an energization rate lower than the preselected energization rate, the selected energization rate is the current energization rate during operation. In the case of higher or equal to the duty factor is characterized in that it comprises means does not change the duty ratio to the selected duty factor, the.

  In the electric floor heating system according to the present invention, the controller includes the above-described energization rate reducing means. When the user operates the energization rate selection means and selects a predetermined energization rate Pi in advance, the energization rate is as follows. Steady operation continues at. When energization continues for a predetermined time t after the start of energization, the energization rate is automatically reduced by the preset difference ΔPx, and the operation at the energization rate Pa (= Pi−ΔPx) is continued. Therefore, even if the electric floor heating system is placed in an environment where the outside air temperature does not change, and the steady operation is continued for a long time when the pre-selected energization rate Pi is near 100%, the floor surface temperature Can be effectively avoided to be higher than the initially selected set temperature level (that is, higher than the floor heating temperature corresponding to the energization rate Pi). As a result, it is possible to maintain the floor surface temperature in a certain temperature range even if continuous operation is performed for a long time, and the comfort of floor heating is not impaired, and low-temperature burns due to thermal blockage occur. I will not let you. Further, reducing the energization rate results in avoiding unnecessary power use, resulting in a reduction in power consumption and an energy saving effect.

  While the operation at the power supply rate Pa (= Pi−ΔPx) is continued, that is, in a situation where the power supply rate is automatically reduced by ΔPx, the user can It may happen that the energization rate Pb is lower than the previously selected energization rate Pi by operating the selection means. At that time, if the selected energization rate Pb is a value smaller than the energization rate Pa during the current operation, the temperature level of the floor heating changes to the lower side, and there is no problem.

  However, the energization newly selected by the user when the value of the difference ΔPx of the automatically decreasing energization rate or the decrease of the energization rate difference ΔPx due to the elapse of time occurs continuously a plurality of times. It is possible that the rate Pb is larger than the current rate Pa during the current operation. In that case, even though the user has selected an energization rate such that the floor temperature is lower than the current temperature, the floor temperature rises, and the user feels uncomfortable and feels a system failure. Let

  The controller according to the present invention automatically selects a power supply rate Pb lower than a preselected power supply rate Pi by operating the power supply rate selection means in a situation where the controller is operated at a reduced power supply rate. Sometimes, when the selected energization rate Pb is higher than or equal to the energization rate Pa during the operation, there is provided means for not changing the energization rate to the selected energization rate Pb. Even if the user selects a floor temperature level lower than the current operating state, it is possible to avoid the occurrence of the above-described situation that the floor temperature rises.

  In the present invention, the energization rate selection means is not particularly limited, but a temperature setting table composed of n-stage scales with a difference in energization rate of ΔPy, and energization of the cord-shaped electric heater during steady operation from the temperature setting table. It is preferable that the energization rate selection unit includes a scale selection unit that selects a scale corresponding to the rate.

  At that time, the energization rate difference ΔPy for each scale set in the temperature setting table and the energization rate difference ΔPx that is automatically reduced when the time t preset by the timer means elapses may be different values. However, preferably, both values are equal. Further, the energization rate may be automatically reduced by the difference ΔPx when the predetermined time t has elapsed, and the state may be continued thereafter. The energization rate is reduced by the difference ΔPx after the predetermined time t has elapsed, It may be set to repeat the pattern in which the energization rate is reduced by the difference ΔPx again when the predetermined time t has further passed from the time.

  In the case where the difference ΔPy and the difference ΔPx are equal to each other, and the setting is such that the conduction rate automatic reduction of the difference ΔPx over multiple stages is performed, for example, the user sets the scale M10 (for example, The operation is started by selecting the energization rate Pi = 100%, the energization rate Pt1 becomes 100−ΔPx (%) after the time t has passed, and the energization rate Pt2 becomes 100−2ΔPx (%) after the time t has passed. ). Since ΔPy = ΔPx, the energization rate Pt1 corresponds to the energization rate of the scale M9 in the temperature setting table, and the energization rate Pt2 corresponds to the energization rate of the scale M8 in the temperature setting table. In this case, when the corresponding scale M (M9 or M8) is displayed on the display means of the controller, the user does not remember changing the scale himself, but a scale different from the original is displayed. There is a risk that you may feel a bug. Therefore, it is preferable not to perform the scale display corresponding to the energization rate when the energization rate is automatically reduced.

  How much time t from the start of energization to the start of automatic energization reduction and how much the energization rate reduction difference ΔPx set in the energization rate reduction means depends on the use conditions and environment of the floor heating. However, it is preferably set in a range in which the temperature range of the floor surface temperature after the reduction of the energization rate does not decrease compared to before the reduction of the energization rate in an environment where the outside air temperature does not change greatly.

  For example, it is practical to set the set time t from the start of energization to the start of the energization rate automatic reduction within a range of 4 to 10 hours after the input, as judged from the usage mode of normal floor heating. In a time shorter than 4 hours, depending on the environment where the electric floor heating system is installed, the energization rate may be forcibly reduced when the floor surface temperature does not reach the set temperature level, The floor surface temperature is lowered, and the user feels uncomfortable. The difference ΔPx is preferably about 5 to 15% of the energization rate Pi set at the start of energization. If the value is reduced to a value larger than this, even in an environment where the outside air temperature does not change significantly, the temperature range of the floor surface temperature after the reduction of the energization rate is such that the user is conscious compared to before the reduction of the energization rate. There is a risk of decline.

  As described above, the energization rate may be reduced once. In that case, after a set time t (e.g., 8 hours) has elapsed, the energization rate Pi set at the start of energization is reduced by, for example, 10% or 15%, and steady operation continues at an energization rate of 90% or 85%. However, if the energization rate is reduced by a large value ΔPx of 10% or 15% at a time in this way, the change in the floor surface temperature temporarily increases, which may cause discomfort to the user.

  In order to avoid this, it is preferable that the timer means in the energization rate control means can set the set time (t1, t2, tn) at the same or different intervals continuously in multiple stages. In this case, for example, when 4 hours (t1) have elapsed after the start of energization, 5% (ΔPx1) of the energization rate set at the start of energization is reduced, and after 4 hours have elapsed (8 hours after the start of energization) (T2) is set to further reduce by 5% (ΔPx2). By reducing the energization rate step by step in this way, the change in floor surface temperature at each step can be reduced, and the user's discomfort is eliminated.

  In the electric floor heating system according to the present invention, the controller may further include means for selecting an energization rate at the start of energization. Specifically, for example, the maximum energization rate Pmax at the start of energization can be selected as a 100% energization rate, a 90% energization rate, and an 80% energization rate for the cord-shaped electric heaters having the same rated output. . For example, a plurality of field tables having different maximum energization rates Pmax at the start of energization are stored in the temperature setting table described above, and are selected by appropriate means. Regardless of which field table is selected, the energization rate is reduced by a preset difference ΔPx from the energization rate Pi selected by the user at the start of energization after a predetermined set time t has elapsed. .

  The means for selecting the maximum energization rate Pmax at the start of energization is extremely effective when the same electric floor heating system is installed in different environments, for example, in regions with different temperatures such as Hokkaido and Tokyo. For example, as a means to select a field table, when installing a dip switch at a position in the controller that is not easily accessible by the user under normal use conditions and constructing an electric floor heating system in the Hokkaido area, The construction is performed by selecting the DIP switch corresponding to the field table having the maximum energization rate Pmax of 100% at the start of energization. On the other hand, when constructing in the Tokyo area, a contractor selects, for example, a dip switch corresponding to the field table of the maximum energization rate Pmax 80% energization rate at the start of energization.

  In cold districts such as Hokkaido, when the user selects a high set temperature, the steady operation mode with an energization rate of 100% at the start of energization proceeds, and the comfortable floor surface between 27 ° C and 30 ° C as described above A temperature is obtained. On the other hand, in a relatively warm district such as Tokyo, a cord-like electric heater with the same rated output is used, and even when the energization rate at the start of energization is set to 80%, the floor surface temperature is 27 ° C. in the steady operation mode. It becomes a comfortable temperature of about ~ 30 ° C. Therefore, even in an electric floor heating system constructed by selecting a low energization rate at the start of energization, the floor surface temperature can reach up to about 40 ° C when the operation is continued for a long time. It is effective to adopt the energization rate reducing means according to the invention.

  In addition, there is no restriction | limiting in particular in the whole structure of the electric type floor heating system in this invention, After arrange | positioning arbitrary structures known conventionally, for example, a cord-shaped electric heater on a floor ground, it is woody from the top In a form constructed by placing a floor material on the floor, or in a form constructed by placing a wooden floor material with a cord-like electric heater integrated on the floor substrate while being electrically connected Everything is included.

  According to the present invention, in an electric floor heating system using a cord-like electric heater as a heat source and adopting an energization rate control method as a floor surface temperature control method, energization for a long time in an environment where the outside air temperature does not change. Even if it continues, it can be surely avoided that the floor surface temperature rises above the set temperature range (level) set at the beginning, giving the user discomfort due to excessive temperature rise, It is possible to reliably avoid the occurrence of low-temperature burns due to the blocking phenomenon. In addition, power consumption can be reduced, and energy saving operation is possible.

  Furthermore, during operation that prevents the floor surface temperature from rising beyond the preset temperature level selected in advance, i.e. during continuous operation with the power supply rate automatically reduced, the user can set the floor heating level. When trying to change to a lower one, it is possible to prevent the floor surface temperature from rising against the user's intention, and the user is not uncomfortable.

  Hereinafter, the present invention will be described with reference to embodiments. FIG. 1 is a schematic diagram showing an electric floor heating system according to the present invention, and FIG. 2 is a block diagram showing an overall control system.

  In FIG. 1, a cord-like electric heater 11 as a heat source is disposed on a floor base 10, and a large number of wood-based flooring 12 having concave grooves for accommodating the cord-like electric heater 11 formed on the back surface thereof. It is laid to create an electric floor heating floor. Although not shown, an electric floor heating floor may be made by placing a wooden floor material integrally incorporating a cord-shaped electric heater on a floor base while being electrically connected. In either case, the cord-shaped electric heater 11 is supplied with commercial power from the outside via the wiring 13, and a controller 20 is attached in the middle of the wiring.

  FIG. 2 is a block diagram showing a control system of the entire electric floor heating system. The electric floor heating system according to the present invention is a cord-shaped electric heater driven by the controller 20 and an energization rate controlled by the controller 20. 11 and. The controller 20 includes a control unit 30, a timer 31 and a DIP switch 32 are connected to the control unit 30, and an operation panel 40, a storage unit 50, and a drive circuit 60 are further connected.

  The operation panel 40 includes an ON / OFF switch 41 for the entire system, a push button 42 for the user to select a power supply rate corresponding to a set temperature level during steady operation, and a scale corresponding to the selected power supply rate (for example, , M10 to M1, etc.) and a teaspray 44 for displaying time and the like.

  The storage unit 50 includes an energization rate reduction table T1 that defines a relationship between the operation time t and the energization rate reduction amount ΔPx, and a scale M and an energization rate P corresponding to a set temperature level selected during the steady operation by the user. A temperature setting table T2 that defines the relationship is stored. An example of the energization rate reduction table T1 is shown in FIG. In this example, the energization rate Pt1 when the time t1 (for example, 4 hours) elapses is P-5 (%) and the time t2 (for example, 8 hours) with respect to the energization rate P% at the time of timer reset including the start of energization. The current energization rate Pt2 is set to P-10 (%), that is, with respect to the initial energization rate P, the energization rate is reduced by a difference ΔPx = 5% every time a predetermined time t elapses. .

  FIG. 4 shows an example of the temperature setting table T2. In this example, the energization rate P% is engraved from 100% to 35% with a difference ΔPy = 5%, and correspondingly, 10 scales M10 (Pmax) to M1 (Pmin) are swung. Three types of field tables (F1, F2, F3) are provided. In the field table F1, the maximum scale M10 corresponds to the energization rate Pmax = 100%, and then gradually decreases by 5%, and the minimum scale M1 corresponds to the energization rate Pmin = 55%. In the field table F2, the maximum scale M10 corresponds to the energization rate Pmax = 90%, and subsequently descends sequentially so that the minimum scale M1 corresponds to the energization rate Pmin = 45%. In the field table F3, the maximum scale M10 corresponds to the energization rate Pmax = 80%, and subsequently descends sequentially so that the minimum scale M1 corresponds to the energization rate Pmin = 35%.

  One of the three field tables F1, F2, and F3 of the temperature setting table T2 is selected by operating the dip switch 32 described above, and information on the energization rate Pi corresponding to the scale Mi in the selected field table Fi is the control unit. 30. The number of field tables F is not limited to three, and may be one, or more field tables F may be set by changing the value of the energization rate Pmax corresponding to the maximum scale M10.

  The drive circuit 60 is a circuit for supplying power from the power supply line 13 to the heater 11, and incorporates a switching circuit 61 as an example of means for performing energization rate control. The switching circuit 61 includes one or two or more relays, and controls the energization rate P to the heater 11 by changing the opening and closing of each relay by a command from the control unit 30, and is known per se. Is.

  As shown in FIG. 3, the control unit 30 sends a signal having a relay opening / closing cycle T to the switching circuit 61. This signal makes the switching circuit 61 conductive in the high level period t1, and makes the switching circuit 61 nonconductive in the low level period t2. The set energization rate P can be obtained by controlling the ratio of t1 / t2 with an appropriate circuit. The control unit 30 includes a comparison circuit 33 which will be described later.

  In the controller 20, the user turns on the ON-OFF switch 41 at the start of use, presses the push button 42 a required number of times, and selects a scale Mi corresponding to a desired temperature setting level (energization rate). The number of times of pressing is taken into the counter of the control unit 30, and the selected scale Mi is displayed on the display 44.

  When the switch 41 is turned on, the start-up operation mode at a 100% energization rate is started. For example, when the time of about 30 minutes has elapsed, the operation mode is switched to the steady operation mode. The control unit 30 sends a signal of the high level period t1 corresponding to the energization rate Pi corresponding to the scale Mi selected by the user to the switching circuit 61, and the floor heating at the floor surface temperature corresponding to the scale Mi is continuously operated. .

  The storage unit 50 of the controller 20 stores the energization rate reduction table T1 (FIG. 3) as described above, and the control unit 30 sends the signal set in the energization rate reduction table T1 over time to the switching circuit 61. To send. Thereby, the energization rate is automatically reduced with time. By having a means for automatically reducing the energization rate in this way, the abnormal rise in floor surface temperature, which may occur when steady operation is continued for a long time near the energization rate of 100%, is suppressed. Can improve the comfort of the electric floor heating system.

  Assume that the user changes the scale M to the lower one (Mb) by pressing the push button 42 of the operation panel 40 when the operation with the power supply rate automatically reduced is continued as described above. . The scale signal is sent to the control unit 30, and the control unit 30 calls the energization rate Pb corresponding to the selected scale Mb from the temperature setting table T2. The control unit 30 includes a comparison circuit 33, compares the current energization rate Pa with the called energization rate Pb, and continues the current operation state when Pb is greater than or equal to Pa. When Pb is smaller than Pa, a signal corresponding to the energization rate Pb is sent to the switching circuit 61. As a result, the system switches to operation at the power supply rate Pb.

  More specifically, it is assumed that the user selects M10 in the electric floor heating system in which the field table F1 is set. When the operation is continued at the energization rate Pt1 of 100-ΔPx (%) after the time t has elapsed, the user changes the scale of the controller from M10 to M9 in order to lower the floor temperature level by one. And In this case, since the energization rate corresponding to the scale M9 is equal to the value of the energization rate Pt1, the change to the energization rate corresponding to the scale M9 does not occur. When the user attempts to lower the floor temperature level by two and changes the scale of the controller from M10 to M8, the energization rate corresponding to the scale M8 is smaller than the value of the energization rate Pt1. The rate is changed to the energization rate corresponding to the scale M8, and the operation at that energization rate is continued.

  When the operation is continued at the energization rate Pt2 of 100-2ΔPx (%) after the time 2t has elapsed, the user has changed the scale of the controller from M10 to M9 in order to lower the floor temperature level by one. And In this case, since the energization rate corresponding to the scale M9 is larger than the value of the energization rate Pt2, the energization rate does not change. Even when the scale of the controller is changed from M10 to M8 in order to lower the floor temperature level by two, the power supply rate corresponding to the scale M8 is equal to the value of the power supply rate Pt2. Absent. When the user tries to lower the floor temperature level by three and changes the scale of the controller from M10 to M7, the energization rate corresponding to the scale M7 becomes a value smaller than the value of the energization rate Pt2 for the first time. The energization rate is changed to the energization rate corresponding to the scale M7, and the operation at that energization rate, that is, the operation in the state where the floor temperature level is lower than before, is continued.

  Hereinafter, an example of a more specific operation mode of the electric floor heating system will be described with reference to FIGS.

  When constructing the electric floor heating system according to the present invention, the contractor operates the dip switch 32 to select the temperature setting scale group, that is, the field table F, optimum for the construction site from the temperature setting table T2. Here, an example of the operation of the electric floor heating system will be described assuming that the field table F1 is selected. If there is one field table F, this step is omitted. Further, as described above, when the steady operation is continued for a long time, the floor surface temperature is abnormally heated in most cases when the energization rate is in the vicinity of the set maximum value. Therefore, in the following description, the case where the user selects the scale M10 of the field table F1 as the set temperature level in the steady operation mode is taken as an example.

  The user turns on the ON-OFF switch 41 of the operation panel 40 (step 301). The control unit 30 reads the dip switch 32 selected in advance, and takes in information about the field table F1 in the temperature setting table T2 (step 302). The user selects the scale Mi corresponding to the set temperature level (energization rate Pi) during steady operation by pressing the push button 42 of the operation panel 40 as many times as necessary (step 303). Accordingly, the temperature setting scale Mi is read into the storage unit 50 (step 304), and the corresponding scale M10 is displayed on the display 44. The timer is reset and start-up operation begins (step 305).

  The control unit 30 determines whether the scale Mi is M10 or not (step 306). When the scale Mi is M9 to M1, after the start-up operation with 100% energization rate, the operation shifts to the steady operation with the energization rate P corresponding to M9 to M1, and the conventional operation is continued (step 400). When the scale Mi is M10, the steady operation is continued at the energization rate P (10) from the start-up operation (step 307).

  The timer 31 monitors whether or not the time t1 from the timer reset has elapsed (step 308). When time t1 (for example, 4 hours) has elapsed, the control unit 30 reduces the energization rate by 5% (step 309). Thereby, the operation at the energization rate P (10) -5% continues (step 310). The energization rate P (10) -5% corresponds to the energization rate of M9, but the scale display on the display 44 is maintained at M10.

  It is monitored whether or not a signal for changing the scale Mi is input (step 311). If there is no change signal, the operation is continued as it is (step 401). When there is a change signal, the control unit 30 reads the energization rate Pb corresponding to the scale Mi after the change from the temperature setting table T2 (step 312), and newly reads the energization rate Pb and the current energization rate Pa. Are compared (step 313).

  If Pb ≧ Pa, the operation at the power supply rate Pa is continued (step 314). When Pn <Pa, the control unit 30 sends a signal corresponding to the energization rate Pb to the drive circuit 60, and continues the operation at the newly selected energization rate Pb (step 315). The display 44 is changed to the newly selected scale (step 316).

  The timer 31 further monitors the passage of time (step 317), and when the time t2 (for example, 4 hours) has passed, the control unit 30 further reduces the energization rate by 5% (step 318). Thereby, the operation at the energization rate P (10) -10% continues (step 319). The energization rate P (10) -10% corresponds to the energization rate of M (8), but the scale display on the display 44 is maintained as before.

  It is monitored whether or not a signal for changing the scale Mi corresponding to the set temperature level (energization rate P) is input (step 320). If there is no change signal, the operation is continued as it is (step 402). When there is a change signal, the control unit 30 reads the energization rate Pb corresponding to the scale Mi after the change from the temperature setting table T2 (step 321), and newly reads the energization rate Pb and the current energization rate Pa. Are compared (step 322).

  If Pb ≧ Pa, the operation at the power supply rate Pa is continued (step 323). If Pn <Pa, the operation at the energization rate Pb is continued (step 324). The display 44 is changed to the newly selected scale (step 325).

  In the above description, the dip switch 32 is exemplified as the selection means of the field table F (F1, F2, F3) in the temperature setting table T2. However, the dip switch 32 is an example, and any selection means may be used. it can. In addition, although the switching circuit 61 using a relay is shown as a circuit for controlling the energization rate, this is also an example, and any conventionally known energization rate control means can be used.

Schematic which shows an example of the electric floor heating system by this invention. The block diagram which shows the control system of the whole electric floor heating system. An energization rate reduction table T1 that defines the relationship between the operation duration time t and the energization rate reduction amount ΔPx. A temperature setting table T2 that defines the relationship between the scale M of the field table F (F1 to F3) and the energization rate P. The figure explaining the waveform which shows the electricity supply rate control in a system. Flow chart of control. Control flow diagram (continued).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Floor base | substrate, 11 ... Code-like electric heater, 12 ... Wood type flooring, 13 ... Wiring, 20 ... Controller, 30 ... Control part, 31 ... Timer, 32 ... Dip switch, 33 ... Comparison circuit, 40 ... Control panel , 42 ... push buttons for setting temperature level, 44 ... display, 50 ... storage unit, 60 ... drive circuit, 61 ... switching circuit, T1 ... energization rate reduction table, T2 ... temperature setting table

Claims (4)

At least a cord-shaped electric heater that is a heat source, an energization rate selecting unit that selects an energization rate to the cord-shaped electric heater during steady operation, and a scale display unit that displays a scale corresponding to the selected energization rate An electric floor heating system including at least a controller,
The controller further includes:
Timer means for monitoring the elapsed time after starting to energize the cord-shaped electric heater;
An energization rate reducing means for automatically reducing the energization rate by a predetermined value ΔPx when a time t set in advance by the timer means elapses;
The selected energization rate when the user selects an energization rate lower than the preselected energization rate by operating the energization rate selection means in the situation where the energization rate is automatically reduced and operating. Means that does not change the energization rate to the selected energization rate when the energization rate is higher than or equal to the energization rate during operation;
An electric floor heating system characterized by comprising:   The energization rate selection means is a scale for selecting a scale corresponding to the energization rate to the cord-shaped electric heater during steady operation from the temperature setting table, and a temperature setting table comprising n-stage scales with a difference in energization rate of ΔPy. The electric floor heating system according to claim 1, further comprising selection means.   The difference ΔPy between the energization rates for each scale set in the temperature setting table and the difference ΔPx between the energization rates automatically reduced when a time t preset by the timer means elapses are set to the same value. The electric floor heating system according to claim 2.   The scale display means maintains the previous scale display without displaying the scale corresponding to the power supply rate when the power supply rate reduction means automatically reduces the power supply rate by the predetermined value ΔPx. The electric floor heating system according to claim 3.

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