KR920009230B1 - Controller with remote control function - Google Patents

Abstract

The controller has a terminal for connecting a remote-control section having a variable resistance circuit with two cables in order to set operation-state in a gas heater etc.. The controller comprises taget value setting section (50); remote control section (60) connected with one of a display lamp of a display load in a line, having a series circuit with VRC and a switch; two cables for connecting the section (60), which controls circuits by detecting voltage from a DC applied terminal and another earthing terminal. The controller determines control setpoint according to voltage at a sub-control unit terminal.

Description

Control device with remote control

1 is a block diagram showing the functional configuration of the gas water heater control device of this embodiment.

2 is a schematic configuration diagram showing a gas water heater of this embodiment.

3 is a detailed circuit diagram of the main remote control in this embodiment.

4 is a detailed circuit diagram of a sub-remote control in this embodiment.

5 is a voltage explanatory diagram showing discrimination voltages related to the main remote controller in the control apparatus of this embodiment.

6 is a voltage explanatory diagram showing discrimination voltages related to sub-remote controllers in the control apparatus of this embodiment.

7 is a voltage waveform diagram for illuminating a lamp of a Gaga remote controller.

12 is a voltage explanatory diagram showing a conventional discrimination voltage.

* Explanation of symbols for the main parts of the drawings

1: gas water heater (apparatus)

30: control device (control device with remote operation function)

50: memory control unit (target setting unit) 60: sub-remote control unit (remote control unit)

61: variable resistance circuit 63: display circuit (load)

SW2: Priority switch (switch)

The present invention relates to a control device having a remote control function having a terminal for connecting a remote control unit having a variable resistance circuit for setting an operating state of the device with two wires.

For example, in the controller of a hot water heater, an operation unit is formed in which a variable resistance circuit for setting a tapping temperature and a display circuit including a display lamp are provided in parallel, and the operation unit has a constant from the control unit for controlling a combustion state or the like. A voltage is applied through the resistor to control the potential of the connection point between the resistor and the variable resistor circuit that changes according to the resistance of the variable resistor circuit as a set temperature signal.

At this time, if the wire for connecting the control device and the control unit is cut off or the connection between the control device and the control unit is incomplete, proper control cannot be performed. Therefore, only when the potential of the connection point between the resistor and the variable resistance circuit is below a constant voltage. In the case where the controller operates to control the hot water heater and displays a potential higher than a predetermined voltage, the hot water heater is not controlled in accordance with the disconnection detection state.

In addition to the operation unit, in order to determine whether to control based on the set temperature signal of the remote control unit having the same configuration, an operation unit switching switch for allowing one operation unit (for example, a remote control unit) to be given priority operation on the operation unit. (Or the priority switch) is formed in direct connection with the variable resistance circuit, and switching is determined as to which of the set temperature signals of the control panel to be effective based on the potential of the connection point that changes as the switch is opened or closed.

In this case, when the switch is closed and the potential of the connection point between the resistor and the variable resistance circuit on the side of the remote control unit formed by the switch indicates a voltage within a predetermined range, the set temperature signal of the remote control unit is selected, and the switch is opened, and the switch is opened. In the case of displaying a predetermined voltage higher than the voltage in the range, the set temperature signal of the operation section in which no switch is formed is selected.

Therefore, in the control apparatus, as for the remote control unit including the operation unit switching switch, the potential of the connection point between the resistor and the variable resistance circuit indicates the disconnection detection state, and the remote control unit is connected but is not used. Since three voltages, such as the voltage in the case of displaying the voltage within the predetermined range as the voltage in the case and the set temperature signal, must be discriminated, for example, as shown in FIG. The voltage for discriminating the potential is set in fine steps.

However, in order to accurately set the voltage in order to discriminate each case in this way, high precision is required in the discrimination circuit of the control apparatus.

For this reason, the control becomes complicated when expensive parts are required or compensation is made in consideration of the error of the parts.

The present invention provides a control device with a remote control function having a terminal for connecting a remote control unit for setting a control target value, the control unit being given to the remote control unit connected to the terminal and giving an instruction function for selecting with the control unit. The purpose is to simplify the configuration of the discrimination function for selection.

The present invention includes a target value setting unit for setting a control target value, and has two terminals for connecting a variable resistance circuit and a serial circuit composed of switches to a remote control unit connected in parallel with a load, and at the same time, a resistance is provided at one side of the terminal. A control device with a remote operation function for applying a series voltage through the terminal and making the other terminal the ground electrode, detecting the voltage of the terminal and controlling the device based on the detected voltage, wherein the detected voltage of the terminal is the switch. In the case of the first predetermined voltage range obtained by making the closed state, the control target value is determined based on the detected voltage and the switch is opened to obtain a second higher than the first predetermined voltage range. In the case where the predetermined voltage is equal to or greater than, the control target value is determined based on the target value setting unit. And a stage.

Hereinafter, the present invention will be described in detail with reference to the drawings.

The burner group 11 which arrange | positioned the some burner is arrange | positioned in the combustor case 10 of the gas water heater 1 shown in FIG. 2, and burns in the burner group 11 arrange | positioned by the plurality of burner burners. A blower 12 for supplying air for installation is installed.

A water pipe heat exchanger 13 is formed above the burner group 11 in the combustor case 10, and water passing through the inside is heated by the heat of combustion by the burner group 11.

In the vicinity of the burner group 11 in the combustor case 10, a sparker 14 for igniting the burner group 11 is provided, and the ignition of the burner group 11 to check the operation of the gas water heater 1. The frame rod 15 which detects is provided.

An exhaust port 2 for discharging the combustion exhaust gas to the outside is provided above the combustion case 10.

A lower portion of the burner group 11 is provided with a nozzle tube 16 for supplying fuel gas, and the nozzle tube 16 includes a plurality of fuels in which the burner group 11 ejects fuel gas corresponding to each burner, respectively. A jet port 16a is formed.

The fuel pipe 20 which guides the fuel gas to the nozzle pipe 16 includes two electron valves 21 and 22 through which the fuel gas passes when it is energized, and a supply pressure of the fuel gas by controlling the supply pressure in accordance with the energizing current. The Gavarner proportional edges 23 to be adjusted are formed in order from the upstream side, respectively.

Although not shown, the water supply pipe (17) for inducing water from the water supply source to the heat exchanger (13) detects the quantity of water passing through the electric light control device (18) and the heat exchanger (13) for adjusting the amount of hot water. The water flow switch 19 is provided in order from the upstream side, and the tapping temperature of the tap water flowing out from the heat exchanger 13 is supplied to the hot water pipe 17a for guiding the tap water flowing out from the heat exchanger 13 to the hot water inlet not shown. The tapping to detect the is provided with a thermistor (25).

The gas water heater 1 which has the above structure is controlled by the control apparatus 30 shown in FIG.

The control device 30 centers on a microcomputer having functions of the sequence control unit 31, the temperature control unit 32, the combustion control unit 33, the quantity control unit 34, and the display control unit 35 by a program in the ROM. Operation state of the main remote controller (hereinafter referred to as the main remote controller: 50), which is a target value setting unit respectively driven by the remote controller driving circuits 40 and 40a, and the sub remote controller (hereinafter referred to as the sub remote controller: 60), which is a remote control unit. Control operation according to

The control device 30 is provided with terminals 36 and 37 for connecting the main remote control 50 and terminals 38 and 39 for connecting the sub remote control 60 to each other.

In the main remote controller 50, terminals 50A and 50B and the like are formed to be connected between the terminals 36 and 37 of the control device 30, and between the control device 30 and each terminal of the main remote controller 50. Is connected by two electric wires 40A and 40B.

In this case, since the polarity is not particularly determined, the terminals 50A and 50B of the main remote controller 50 may be connected to the terminals 36 and 37 of the control device 30 in reverse.

In the sub-remote control unit 60, terminals 60A and 60B and the like are formed in order to connect between the terminals 38 and 39 of the control device 30, and between each terminal by two wires 40C and 40D. Is connected.

In addition, since the structure is not specifically determined in the sub-remote control unit 60 as described above, the terminals 60 and 60B may be connected to the terminals 38 and 39 of the control device 30 in reverse.

First, the configuration of the main remote control 50 will be described.

In the main remote controller 50, the variable resistance circuit 51, the operation switch circuit 52, and the display circuit 53 are formed in parallel between the terminals 50A and 50B as shown in FIG.

The variable resistor circuit 51 is a variable resistor VR1 and a resistor R1 connected in parallel to each other in series with a resistor R2. The variable resistor circuit 51 is changed by a user operating the variable resistor VR1 as appropriate. The set temperature is determined according to the resistance value of (51).

The operation switch circuit 52 is composed of an operation switch SW1 for instructing operation start and stop of the gas water heater 1 and a resistor R3 connected in series with the operation switch SW1. The pushbutton switch is used to close the circuit only during operation.

In addition, the display circuit 53 is composed of six diodes D1 to D6 which form a full-wave rectifier circuit so that the terminals 50A and 50B may be connected to the terminals 36 and 37 of the control device 30 in reverse. It comprises a bridge circuit 54, a combustion lamp circuit 56 and a driving lamp circuit 57 formed in parallel as a switch circuit 55 on the output side of the bridge circuit 54.

At this time, the bridge circuit 54 allows the voltage applied between the terminals 50A and 50B to be in a predetermined direction with respect to the switching circuit 55, the combustion lamp circuit 56, and the driving lamp circuit 57, and at the same time a diode By connecting the D3 and the diode D4 and the diode D5 and the diode D6 in series, the rising voltage of the display circuit 53 is set high and the driving voltage of the display circuit 53 is increased. When not supplied, the current flowing through the display circuit 53 is reduced.

The switching circuit 55 is a circuit for supplying lamp lighting power to the combustion lamp circuit 56 and the driving lamp circuit 57 when the voltage supplied from the bridge circuit 54 is equal to or higher than a predetermined voltage. When the breakdown voltage of the Zener diode ZD1 connected to the base of the transistor Q1 is exceeded through R4, the transistors Q1 and Q2 are both turned on, so that a predetermined voltage is applied to each of the lamp circuits 56 and 57. Supplied.

The combustion lamp circuit 56 includes a predetermined AC component in a DC voltage to be applied to the resistor R5 through the diode D7 when the lamp lighting power is supplied from the switching circuit 55. When the AC component is above a predetermined voltage, the combustion lamp L1 made of the light emitting diode LED is turned on.

Here, the AC component included in the DC voltage applied to the resistor R5 passes through the capacitor C1, rectifies the voltage by the diodes D8 and D9, and then charges the capacitor C2 through the resistor R6. do.

When the charging voltage of the capacitor C2 is greater than or equal to a predetermined voltage, the charge charged in the capacitor C2 is applied to the base bias current of the transistor Q3 through the resistor R7, so that the transistor Q3 is 'on'. The combustion lamp L1 connected to the collector thereof is turned on.

In addition, the driving lamp circuit 57 turns on the driving lamp L2 made of the light emitting diode when the lamp lighting power is supplied from the switching circuit 55 and the effective value of the DC voltage at that time is a voltage higher than or equal to the predetermined voltage. .

Here, only when the potential of the capacitor C3 charged with the supply voltage from the switching circuit 55 through the resistor R8 and discharged by the diode D10 when the supply voltage is lower than the charge voltage is higher than or equal to the predetermined voltage, A predetermined bias current flows through the resistor R9 to the base of the transistor Q4, and the transistor Q4 is turned on, and the driving lamp L2 connected to the collector thereof is turned on.

Next, the sub remote control 60 will be described.

In the sub-remote control unit 60, the variable resistance circuit 61 and the display circuit 63 are provided in parallel between the terminals 60A and 60B as shown in FIG.

In the variable resistor circuit 61, the variable resistor VR2 and the resistor R11 connected in parallel as in the variable resistor circuit 51 are connected in series with the resistor R12, and in turn, the rotary priority switch (series) SW2) is connected.

The priority switch SW2 is a switch for performing temperature control in the control device 30 according to the set temperature of the sub-remote control 60. In the control device 30, the priority switch SW2 is' When in the 'on' state, the sub-remote control unit 60 is selected, and in the 'off' state, the main remote controller 50 is selected.

The display circuits 63 have the same configuration as that of the display circuits 53 in the main remote controller 50.

The bridge circuit 64 and the output side of the bridge circuit 64 are provided in parallel via a switching circuit 65, and are provided with a combustion lamp circuit 66 having a combustion lamp L3 and a driving lamp L4. One driving lamp circuit 67 is formed, and on the output side of the bridge circuit 64, a priority display circuit 68 is formed in parallel with the switching circuit 65.

At this time, the priority display circuit 68 connects the display switch SW3, the resistor R13 and the priority lamp L5 made of a light emitting diode in series.

The display switch SW3 is a rotary switch interlocked with the priority switch SW2. When the sub-remote control 60 is given priority, the priority lamp L5 is turned on by closing the circuit like the priority switch SW2. .

These main remote control 50 and the sub-remote control 60 is provided in the control device 30 according to a user's needs, and when the main use mode is provided with the main remote control 50 and the sub remote control 60 together, When only the main remote control 50 is provided, there are three cases in which no remote control is provided.

In addition, the sub-remote control 60 can be connected to the terminals 36 and 37 as it is instead of the main remote control 50 by switching the illustrated dip switch. In this case, the sub-remote control connected to the terminals 36 and 37 ( Although the priority switch SW2 of 60 is used as an operation switch, it will be described below that the main remote control 50 is connected to the terminals 36 and 37.

Next, each functional part in the control apparatus 30 and the control apparatus 30 is demonstrated, respectively.

In the control apparatus 30, when the control apparatus 30 is connected to a light wire, the 5V power supply which is not shown in figure is always supplied and it operates in the standby state with a microcomputer.

In the sequence control unit 31, when the control device 30 is connected to the light line, the terminal 30 is always in a start standby state, and between the terminals 36 and 37 whose resistances are detected through the 41 and 41a, respectively. Alternatively, the predetermined operation mode is determined based on the terminal voltages V ₅₀ and V ₆₀ between the terminals 38 and 39.

The sequence controller 31 reads 0.5-2.5V as the set temperature voltage for each terminal voltage V _{50 and} V ₅₀ as shown in FIG. 5 or FIG. 6, and 3.5-5V disconnection detection voltage. And 0.05 V or less as a short-circuit detection voltage between the terminals 36 and 37 or between the terminals 38 and 39.

Also with respect to the main remote control unit 50, the terminal voltage (V ₅₀₎ on the side of the lower back than the lowest voltage (0.5V) of reading a set point voltage and the control voltage of a voltage of 0.05V-0.3V as a short circuit detecting voltage operation switch Read as

On the other hand, with respect to the terminal voltage V ₆₀ of the sub-remote control unit 60, 0.5-2.5 V as the set temperature voltage is detected only when the priority switch SW2 is closed. It is assumed that the remote control 60 is used first.

On the contrary, when the priority switch SW2 is in the open state, the terminal static voltage V ₅₀ is higher than the set temperature voltage of 0.5-2.5V, so that 3.5-5V is detected when each main remote controller 50 is used.

In this way, when a voltage of 0.5-5V is detected with respect to the terminal voltage V ₆₀ , it is not possible to determine whether it is due to disconnection or the like, and if the priority switch SW2 is in an open state. Since the setting state of the variable resistance circuit 61 of FIG.

In addition, the operation mode is determined by determining the connection state or the conduction state, respectively, according to whether the terminal voltages V ₅₀ and V ₆₀ are the disconnection detection voltages or the set temperature voltages respectively set as described above.

Examples of the operation mode include a multi-mode in which the main remote controller 50 and the sub-remote controller 60 are connected together, an automatic mode in which the remote controller or the like is not connected, and a single mode in which only the main remote controller 50 is connected. have.

On the other hand, when the operation signal of the operation switch SW1 is detected in addition to the automatic mode, the sequence control unit 31 enters the operation standby state, and in the automatic mode, always the operation standby state.

In the case of the multi-mode as described above, when the operation signal of the operation switch SW1 is detected and the operation standby state, either of the terminals according to the terminal voltage V ₆₀ on the side of the sub-remote control unit 60 having the priority switch SW2. It determines whether to control based on the remote controller setting temperature information of the controller, and transmits the set temperature from the selected remote controller to the temperature controller 32.

In the operation standby state, the display controller 35 transmits the information in the operation standby state to the display control unit 35 and the like.

In the operation standby state, the power supply of the blower 12 of the gas water heater 1 and the drive circuit for driving each valve is supplied, and when water flow to the heat exchanger 13 is detected by the water flow switch 19, it is predetermined. The combustion control is started by starting the combustion control. When the water supply stop is detected, the combustion is stopped by the digestion sequence control.

When the temperature controller 32 is in the operation standby state and the operation state, the set temperature voltage from the selected remote controller is read in advance before the passage of water starts, and the tapping operation determines the amount of heating from the detected temperature information by the thermistor 25. This is transmitted to the combustion control unit 33.

The combustion controller 33 controls the blower 12 and the governor proportional valve 23 according to the heating amount determined by the temperature controller 32 to control the combustion amount of the burner group 11.

In automatic mode, it is always in operation standby state, and when water flow is detected, it operates at a set temperature (for example, 60 ° C or 75 ° C) as the set temperature, and in stand-alone mode, it is in the start standby state and the main remote control of the multi-mode First of all, it operates only by the operation state of the main remote control 50.

The display control unit 35 includes information on the selected remote controller and combustion information detected by the frame rod 15. The display controller 35 lights three lamps of each of the remote controllers 50 and 60 according to an operation state. Send each to

Prior to the description of the control cooling of the display control unit 35, the configuration of the control circuit remote control drive circuits 40 and 40a by the display control unit 35 will be described.

In the remote controller driving circuits 40 and 40a, a supply voltage from a 5V power source is applied to the terminals 36 and 38 through the resistors 42 and 42a, respectively, and each remote controller 50 to be connected to each terminal 36 and 38 is provided. And 60 are always supplied as the detection voltage Vrem.

Switching transistors 40 and 40a have switching transistors for directly supplying DC voltages from the 5V power supply to the respective terminals 36 and 38 in addition to the detection voltage Vrem to the respective remote controls 50 and 60. 43 and 43a are connected to the respective terminals 36 and 38 via the respective terminals 44 and 44a.

In addition, switching transistors 45 and 45a are connected to the respective terminals 36 and 38 in order to directly supply DC voltages of the 12V power supply (not shown) to the remote controllers 50 and 60.

In front of the transistors 45 and 45a, switching transistors 46 and 46a are provided, and each of the transistors 43, 43a, 46 and 46a is controlled by the display control unit 35, respectively.

In the remote control drive circuit 40, each switching transistor 43, 45 applies each voltage to the terminal 36 only when it is 'on' by a control signal, and the transistors 43, 45 are 'off' together. Only the voltage from the 5V power supply is applied to the terminal 36 via the resistor 42 as the detection voltage Vrem.

When the transistor 43 for directly supplying power from the 5V power supply and the transistor 45 for directly supplying power from the 12V power supply are both 'off', the detection voltage Vrem at the 5V power supply is the main remote control 50. ) Is applied to the parallel circuit of the variable resistance circuit 51 and the operation switching circuit 52 and the series circuit composed of the resistor 42, and the terminal 36 has a variable resistance circuit in the main remote control 50 (). According to the operating state of 51), the divided voltage different from the combined resistance is represented by the terminal voltage (V ₅₀ ).

Also in the remote controller driving circuit 40a, when the voltages are applied as in the remote controller driving circuit 40, and the transistors 43a and 45a are both 'off', the terminal 38 is connected to the operation state of the remote controller 60. The resulting voltage is represented by the terminal voltage V ₅₀ .

The display control unit 35 controls each remote control unit 50 or 60 in accordance with the control state of the sequence control unit 31 through the remote control drive circuits 40 and 40a having the above-described configuration.

The control of lighting of each lamp, the number of lights, and the lighting off are the operation states of the gas water heater, depending on whether it is in the operation standby state, whether it is in combustion, whether it is burning or not, and whether or not the remote control is in the priority state. 50, 60) will be displayed separately.

The combustion lamps L1 and L3 are lit continuously during combustion when the flame is detected by the frame rod 15 irrespective of priority of the remote control, regardless of non-priority, and abnormally detected in the case of ignition or misfire during combustion. Flashes as status.

The operation lamps L2 and L4 are turned on in the remote control that is in the priority side during operation standby and combustion, and in the remote control that is in the non-priority side, it blinks in the case of the main remote control 50 and in the case of the sub-remote control 60. .

When an abnormality occurs, first, the lamp is turned off without turning on regardless of non-priority.

The operation lamp L4 is turned on or the combustion lamp L3 flashes only when the priority lamp in the sub-remote control 60 or the priority of the sub-remote control 60 in which the priority switch SW2 and the display switch SW3 are closed. Lights up or flashes in response to the lighting of the combustion lamp L3.

Table 1 shows the relationship between the display state in each of the remote controllers 50 and 60 and the operation state of the gas water heater 1.

TABLE 1

Hereinafter, the control by the display control unit 35 to the remote controller driving circuit 40 will be described.

In addition, the remote control drive circuit 40a is described in parentheses.

(1) When only the operation lamp L2 (L4) is turned on without the combustion lamp L1 (L3) turned on, the transistor 45 (45a) is turned on, as shown in FIG. Power is generally supplied continuously.

In this case, since the set temperature signal is read from the remote control under this control, the time for supplying only the detection voltage (Vrem) from the 5V power supply is supplied in 30mS intervals by stopping the power supply from the 12V power supply for a short time. It is set.

(2) When only the driving lamp L2 (L4) is flashed without turning on the combustion lamp L1 (L3), the transistor 45 (45a) is 'on' and 'off' according to the flashing cycle, and the result is shown in FIG. As shown below, the power from the 12V power supply is intermittently supplied.

The flashing cycle at this time is 8.7 seconds 'on' and 2.7 seconds 'off'.

(3) When the combustion lamp L1 (L3) and the operation lamp L2 (L4) are turned on together, the transistor 43 (43a) is turned on to continuously supply the power from the 5V power supply, and at the same time, the transistor (45 (45a)) is controlled to convert the pulse into pulses as shown in FIG. 9 by repeatedly performing a constant pulse of 10mS, that is, 5mS 'on' and 5mS 'off'. The power from the supplied 12V power supply is superimposed with the power from the 5V power supply.

Also in this case, the power from the 5V power supply and the power from the 12V power supply are maintained together so that only the detection voltage Vrem is supplied at 3mS intervals at 30mS intervals.

④ When only the combustion lamp L1 (L3) is turned on continuously and the operation lamp L2 (L4) is blinking, as shown in the above ③, for example, from a 12 V power source converted into a continuous pulse of 10 mS continuous pulse. Power is supplied continuously and the transistor 43 (43a) is 'on' and 'off' according to the flashing period to control the power from the 5V power supply to change with the flashing cycle as shown in FIG.

⑤ When only the combustion lamp L1 (L3) blinks without turning on the operation lamp L2 (L4), the transistor 43 (43a) is fixed in the 'off' state to cut off the power at the 5V power supply. As shown in Fig. 11, the intermittent operation is repeated according to a flashing cycle in which the power from the 12V power source converted into a continuous constant pulse of 10mS pulse cycle is repeated 'on' for 1 second and 'off' for 1 second. Supply by

The transistor 43 (43a) for directly supplying power from the 5V power supply and the transistor 45 (45a) for supplying power directly from the 12V power supply are both 'off' and the voltage for detection from the 5V power supply ( The time for which only Vrem) is supplied is set at intervals of 30mS by 3mS.

In this case, the time for supplying only the detection voltage Vrem is a very short time of 3 mS, so that the flashing display of each lamp can be performed without a visual problem.

In the sequence control unit 31, when 0.05 V or less is detected as the short-circuit detection voltage between the terminals 36 and 37, the transistors 43 and 45 in the remote control drive circuit 40 are damaged from damage or the like. In order to protect each transistor 43, 45 so as not to be 'on' power supply is stopped.

In the case where the short circuit detection voltage between the terminals 38 and 39 is detected to be 0.05 V or less in this way, the power supply by each of the transistors 43a and 45a in the remote control drive circuit 40a is stopped.

The water quantity control unit 34 controls the lamp type water quantity control unit 18 based on the detected temperature information by the tapping temperature thermistor 25 to restrict the flow rate of the heating capacity or more through the heat exchanger 13.

When the main remote control 50 is normally connected between the terminals 36 and 37 for connecting the main remote control 50, and there is no disconnection in the electric wires 40A and 40B or the main remote control 50, and it is conducting. The voltage value of the only voltage V ₅₀ is obtained by dividing the detection voltage Vrem by the resistor 42, the variable resistance circuit 51, and the like, and is usually 0.5 to 2.5 V depending on the resistance value of the variable resistor VR1. Indicates a value between

On the contrary, when the main remote controller 50 is not normally connected between the terminals 36 and 37, or when the electric wire or the like is disconnected and is not conducting, the detection is applied to the terminal 36 through the resistor 42. The voltage Vrem is detected as a voltage value very close to 5V because there is almost no voltage drop.

In the case where the priority switch SW2 is opened with respect to the sub-remote control unit 60, no current flows to the variable resistance circuit 61 even when the wires 40C and 40D and the sub-remote control unit 60 are in a conductive state. Only terminal 63) detects the terminal voltage V ₆₀ by the voltage drop caused by the current.

In this display circuit 63, in the bridge circuit 64, the diodes D3 and D4, D5 and D6 are connected in series, and the display circuit 63 has a high input voltage. The current value flowing through the display circuit 63 by Vrem is very small.

For this reason, the terminal voltage V ₆₀ becomes very high.

However, the fact that the priority switch SW2 is in the open state is a case where control is not performed by the setting signal from the sub-remote controller 60, and therefore, there is no problem on the control.

The connection function of the main remote control unit 50 and the sub remote control unit 60 is determined by the determination function, and an operation mode according to the connection state of each remote control unit is determined based on the connection state.

Therefore, it is not necessary to separately change the mode of the control device 30 according to the connection state of the remote controller.

As described above, in the present embodiment, the discrimination voltage for disconnection detection and the discrimination voltage in the case of non-priority use are common to the sub-remote control unit 60, so that the configuration of the circuit and the like for voltage discrimination is simplified.

In the above embodiment, the frame rod is used as the ignition detection means, but a thermocouple may be used for the combustion detection.

In the above embodiment, although the gas hot water heater is shown, it is not limited to the combustion apparatus provided with the some operation part, It may be air-conditioning apparatuses, such as air-conditioning etc. provided with a some operation part, and lighting fixtures.

Claims (1)

(Correct) The remote control unit has a target value setting unit 50 for setting a control target value, and the remote control unit 60 has a remote control unit 60 in which one of a display load or a display lamp is connected in parallel to a series circuit composed of a variable resistance circuit and an open / close switch. In addition to having two connection terminals for connection, DC voltage is applied to one side of the terminal through a resistor, and the other terminal is used as a grounding electrode to detect the voltage at both terminals and control the device based on the detected voltage. In the control device with a remote operation function, the control target value is determined according to the level of the detected voltage when the detected voltage of the terminal is within the first predetermined voltage range obtained when the on / off switch is closed. When the open / close switch is in the open state and is higher than or equal to the second predetermined voltage range higher than the first predetermined voltage range, The control device is a remote control function, characterized in that the determining of the control target value by the target value setting unit group attached.

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