JPH06105993B2 - Remote control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a control provided with a terminal for connecting a remote operation section having an operation switch for giving an instruction of an operation state of a device with two electric wires. The present invention relates to a remote control device with a function.

[Prior Art] For example, in a water heater control device, a variable resistance circuit for setting a hot water outlet temperature and a switch circuit including an operation switch for making the water heater operable are provided with a control device and two There is an operation unit connected in parallel with a display circuit in an operation unit connected by an electric wire.

In such a control device, a tact type that the contact is closed only when the operation switch is operated and the contact is opened in other cases is used, and the switch circuit when the operation switch is closed is used. In order to make the combined resistance value with the variable resistance circuit clearly distinguishable from the resistance value set only by the variable resistance circuit, one terminal of the control device is grounded and the other terminal has a constant voltage. The operating state of the operating portion is detected by detecting the voltage of the terminal to which the voltage is applied in advance.

In addition, since the display power must be simultaneously sent to the display unit by the two wires to the operation unit, only the pulsed voltage for detecting the terminal voltage is supplied during the power supply to the display circuit. The voltage at the terminal is detected when this pulsed voltage is applied,
Based on the detected voltage, the operation state of the operation switch is determined, and the connection state of whether or not the operation section is connected is determined.If the detected terminal voltage is high, there is a gap between the terminals. If it is determined that the operation unit is not connected because it is in the open state, and this state is repeatedly detected, it is always the case that the operation unit is not connected, for example, always in the operation standby state (ON). When water flow is detected, automatic operation is performed so as to obtain a preset hot water temperature.

In such a thing having an automatic driving function, for example, when the connection state returns to normal when the connection state becomes poor, or when a new connection is made when the operation unit is not connected, If the operation standby state (ON), which is equivalent to the operation of the operation switch, is set, the connection is detected because the operation section is always in the operation standby state (ON) only. When the state is changed from the non-operated state to the state in which the connection is detected, the operation switch is set to the standby state (OFF) in which the operation switch is not yet operated.

[Problems to be Solved by the Invention] However, conventionally, the operation state of the operation switch and the connection state of the operation portion are detected based on the terminal voltage only for a short time when the pulsed voltage is applied. So, for example,
When the voltage detected at the terminal fluctuates for a short time due to the occurrence of lightning in the standby state, it is detected as a defective connection state and it returns to the normal state again, the device stops. There's a problem.

The present invention detects a transmission state such as a connection state with the operation unit,
In the remote operation device that controls according to the transmission state, even when an abnormality in the transmission state with the operation unit is detected,
The purpose is to be able to use the device with confidence.

[Means for Solving the Problem] The present invention includes an automatic reset type switch for instructing the operation and stop of operation of a device, and connects an operation unit for instructing operation and stop only when the switch is operated. A remote control device having two terminals for controlling the operating state of the device in the operation standby state or the operation stop state according to a signal from the operation section transmitted through the two terminals. When the signal from the operation unit is defective in coal transfer, the operating state before the transmission defect is detected is stored and the operation is performed according to the transmission defect. When is restored, the technical means is to drive according to the stored operating state.

[Operation] In the present invention, the operating state is controlled according to the signal transmitted to the two terminals to which the operating section is connected, and when the signal is transmitted, the operating state is controlled according to the instruction of the switch of the operating section. Is controlled and the signal is not transmitted, for example, it is controlled to a predetermined operating state.

If a signal is transmitted from the operation unit and the signal is not transmitted due to transmission failure when the signal is transmitted to the operation standby state according to the switch operation, the operating state at that time is stored and It is controlled to a predetermined operating state as the operating state when no signal is transmitted.

When the transmission failure is resolved and the signal from the operation unit is restored, the operation state corresponding to the stored switch instruction is restored and the operation is performed.

[Advantages of the Invention] According to the present invention, when the transmission from the operation unit is normally performed, if the transmission becomes defective, the signal is transmitted from the operation unit to the operating state in which the signal is not transmitted. When is restored, the operation that returns to the operating state before the transmission failure is performed.

Therefore, even if there is a transmission failure due to lightning, etc., when the equipment is operating according to the operation signal from the operation unit, the operation is temporarily performed when there is no signal from the operation unit. Since the vehicle is driven in the operating state before the transmission failure again after the recovery, the user can use the system without knowing the change.

In addition, if there is a transmission failure in the operation standby state, the operation standby state is stored, and if the transmission failure is resolved, it can be returned to the operation standby state. There is no end.

Further, since it is stored in the operation stopped state, the operation standby state does not occur when the transmission failure is resolved.

Therefore, the user can use the device without feeling communication abnormality.

[Embodiment] Next, the present invention will be described based on an embodiment shown in the drawings.

In the gas water heater 1 shown in FIG. 2, a burner group 11 composed of a plurality of burners is arranged in a combustor case 10 having an exhaust port 2 at the upper side, and a burner group 11 is arranged below the combustor case 10. A blower 12 is provided to supply combustion air to the. Above the burner group 11 in the combustor case 10, there is provided a heat exchanger 13 for heating the water passing through the inside by the combustion heat of the burner group 11. In the vicinity of the burner group 11, a sparker 14 for igniting the burner group 11 and a burner group 11
A frame rod 15 is provided to detect ignition of the.

Below the burner group 11, a fuel jet pipe 16 for supplying fuel gas is provided, and the fuel jet pipe 16 has a plurality of fuel jet ports for jetting fuel gas corresponding to the burners of the burner group 11, respectively. 16a is provided.

In the fuel pipe 20 which guides the fuel gas to the fuel jet pipe 16, two solenoid valves 21 and 22 which allow the fuel gas to pass when energized, and the supply pressure is controlled according to the energizing current to adjust the amount of the fuel gas supplied. The governor proportional valves 23 are provided in order from the upstream side.

A water supply pipe 17 that guides water to the heat exchanger 13 is provided with an electric water amount control device 18 for adjusting the amount of hot water supplied and a water flow switch 19 for detecting the water flow passing therethrough in order from the upstream side. A hot water supply pipe 17a for guiding hot water flowing out of 13 to a hot water supply port (not shown) is provided with a hot water temperature thermistor 25 for detecting the hot water temperature of the hot water flowing out.

The gas water heater 1 having the above configuration is controlled by the control device 30 shown in FIG.

The control device 30 is mainly a microcomputer having functional units of a sequence control unit 31, a temperature control unit 32, a combustion control unit 33, a water amount control unit 34, and a display control unit 35, which have predetermined functions according to a program in the ROM. The main remote controller (hereinafter referred to as "main remote controller") 50 driven by the remote controller drive circuits 40 and 40a, respectively.
Also, operation control is performed according to the operation state of the sub remote controller (hereinafter referred to as “sub remote controller”) 60.

The control device 30 includes terminals 36 and 37 for connecting the main remote controller 50, terminals 38 for connecting the sub remote controller 60,
39 are provided.

The main remote controller 50 is provided with terminals 50A and 50B for connecting between the terminals 36 and 37 of the control device 30, and two electric wires are provided between each terminal of the control device 30 and the main remote controller 50.
It is connected by 40A and 40B. In this case, the polarity is not specified in particular, so the terminals 50A and 50B of the main remote controller 50 are
It may be reversely connected to the terminals 36 and 37 of the controller 30.

Similarly, the sub remote controller 60 includes terminals 38, 39 of the control device 30.
Terminals 60A and 60B are provided for connection between the terminals, and the terminals are connected by two electric wires 40C and 40D. Similarly, the terminals 60A and 60B of the sub remote controller 60 are
It may be reversely connected to the terminals 38 and 39 of the controller 30.

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

As shown in FIG. 3, the main remote controller 50 has terminals 50.
A variable resistance circuit 51, an operation switch circuit 52, and a display circuit 53 are provided in parallel between A and 50B.

The variable resistance circuit 51 is composed of a variable resistor VR1 and a resistor R1 connected in parallel and a resistor R2 connected in series.The resistance of the variable resistor circuit 51 is changed by the user operating the variable resistor VR1. The set temperature is determined according to the value.

The operation switch circuit 52 includes an operation switch SW1 for instructing start and stop of operation of the gas water heater 1, and a resistor R3 connected in series to the operation switch SW1.
A normally open push button switch is used for the circuit, and the circuit is closed only during operation.

The display circuit 53 includes a bridge circuit 54, a switching circuit 55,
It comprises a combustion lamp circuit 56 and an operation lamp circuit 57.

The bridge circuit 54 forms a full-wave rectification circuit that allows the voltage applied between the terminals 50A and 50B to be in a fixed direction with respect to the switching circuit 55, the combustion lamp circuit 56, and the operation lamp circuit 57. Display circuit by connecting diodes D1 to D6 in series, diode D3 and diode D4, and diode D5 and diode D6 respectively.
The rising voltage of 53 is set high.

The switching circuit 55 is a circuit for supplying electric power for lighting the lamp to the combustion lamp circuit 56 and the operation lamp circuit 57 when the voltage supplied from the bridge circuit 54 is equal to or higher than a predetermined voltage.

The combustion lamp circuit 56 is supplied with electric power for lighting the lamp from the switching circuit 55, the AC voltage is included in the DC voltage at that time, and a combustion lamp including a light emitting diode (LED) when the AC component is equal to or higher than a predetermined voltage. Turn on L1.

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

Next, the sub remote controller 60 will be described.

As shown in FIG. 4, the sub remote controller 60 has terminals 60A, 6
The variable resistance circuit 61 and the display circuit 63 are provided in parallel between 0B.

Like the variable resistance circuit 51, the variable resistance circuit 61 includes a variable resistor VR2 and a resistor R11 which are connected in parallel and a resistor R12 which are connected in series, and a rotary priority switch SW2 which is connected in series to these. There is. The priority switch SW2 is a switch for performing temperature control control in the control device 30 based on the set temperature of the sub remote controller 60. In the control device 30, the sub remote controller 60 is selected when the priority switch SW2 is in the ON state. , Main remote control when off
50 is selected.

The display circuit 63 has the same configuration as the display circuit 53 in the main remote controller 50, and the bridge circuit 64, and the combustion lamp circuit 66 provided in parallel via the switching circuit 65 on the output side of the bridge circuit 64 and provided with the combustion lamp L3. A priority indicator circuit 68 is provided in parallel with the switching circuit 65 on the output side of the bridge circuit 64.

The priority display circuit 68 includes a display switch SW3, a resistor R13, and a priority lamp L5 including a light emitting diode connected in series. The display switch SW3 is a rotary switch that works in conjunction with the priority switch SW2, and when giving priority to the sub remote controller 60, closes the circuit together with the priority switch SW2 and turns on the priority lamp L5.

In the control device 30, when the control device 30 is connected to the power line, the 5V power source (not shown) is always operating and the microcomputer is operating in the standby state.

In the sequence control unit 31, when the control device 30 is connected to the power line, the sequence control unit 31 is always in the start standby state, and the resistors 41, 41
between terminals 36 and 37 respectively detected via a, terminal 3
The predetermined operation mode is determined based on the terminal voltages V ₅₀ and V ₆₀ between 8 and 39.

In the sequence control unit 31, each terminal voltage V ₅₀ , V _{60 is} 0.5, as shown in FIG. 5 or FIG. 6, respectively.
~ 2.5V is read as set temperature voltage, 3.5 ~ 5V is read as disconnection detection voltage, 0.05V or less between terminals 36 and 37,
Read as the short circuit detection voltage between terminals 38 and 39.

Regarding the terminal voltage V ₅₀ on the main remote controller 50 side,
The minimum voltage to read as the set temperature voltage is lower than 0.5V and higher than 0.05V as the short circuit detection voltage 0.05 to 0.3
The voltage of V is also read as the operation switch operating voltage.

On the other hand, the terminal voltage V ₆₀ of the sub-remote controller 60 side, being detected 0.5~2.5V as set temperature voltage from being limited to the case where priority switch SW2 is closed, is detected set temperature voltage When the sub remote control 60 is used preferentially.

Conversely, when the priority switch SW2 is open, the terminal voltage V ₆₀
Is higher than the set temperature voltage of 0.5 to 2.5V, so 3.5 to 5V
Is detected when the main remote controller 50 is used.

In this way, when a voltage of 3.5 to 5 V is detected for the terminal voltage V ₆₀ , it cannot be determined whether it is due to a wire break or the priority switch SW2 is in the open state. Since the setting state of the variable resistance circuit 61 of the sub remote controller 60 is irrelevant to the control, there is practically no problem.

The operation mode is determined based on whether each terminal voltage V ₅₀ , V ₆₀ is the disconnection detection voltage or the set temperature voltage set as described above, and determines the connection state, conduction state or short-circuit state of each. Determined and determined.

The operation modes include a multi mode in which the main remote controller 50 and the sub remote controller 60 are both connected, an automatic mode in which no remote controller is connected, and a single mode in which only the main remote controller 50 is connected, depending on the usage pattern. .

Normally, such a determination of the operation mode is automatically performed when the control device 30 is connected to the power line, and the mode is determined according to each connection state, but during normal use,
When the connection of the main remote controller 50 is detected, for example, when the power supply voltage changes due to lightning,
As a result, the detected voltage may temporarily fluctuate.

In such a case, if the mode is directly changed according to the detected voltage, the operating state may change.

In this embodiment, the main remote controller 50 is controlled by the terminal voltage V ₅₀ .
When the connection is detected, the terminal voltage V ₅₀ fluctuates, for example, when the disconnection detection voltage is detected and the setting state of the main remote controller 50 is no longer detected, the operating state immediately before the disconnection detection is detected. It is memorized and the operation is performed by changing to the automatic mode as the disconnection detection state.

Normally, the disconnection detecting means can immediately return to operation. Therefore, when the disconnection detection voltage is no longer present, the operation is restarted based on the stored operating state.

The sequence control unit 31 enters the operation standby state when the operation signal of the operation switch SW1 is detected in the modes other than the automatic mode, and always enters the operation standby state in the automatic mode.

In the case of the multi-mode, based on the terminal voltage V ₆₀ of the sub remote controller 60 equipped with the priority switch SW2, it is determined which remote controller is to be controlled based on the set temperature information,
When the operation signal of the operation switch SW1 is detected and the operation standby state is entered, the set temperature from the selected remote controller is transmitted to the temperature control unit 32.

Also, in the operation standby state, being in the operation standby state,
The selection information of the selected remote controller is transmitted to the display control unit 35.

In the operation standby state, when the power of the drive circuit for driving the blower 12 of the gas water heater 1 and each valve is turned on, and water flow to the heat exchanger 13 is detected by the water flow switch 19, a predetermined ignition sequence is performed. Control and start combustion,
When the stoppage of water flow is detected, the combustion is stopped by the fire extinguishing sequence control.

On the other hand, if a short circuit between each terminal is detected by the terminal voltages V ₅₀ and V ₆₀ , an abnormality indication signal is sent to the remote control that has not detected a short circuit as the abnormality detection state, and the main remote control 50 in particular selects it. If the main remote controller 50 side terminals are short-circuited, the automatic mode is activated.

In the operation standby state and the operation state, the temperature control controller 32 has already read the set temperature voltage from the selected remote controller before the water flow is detected, and the hot water temperature thermistor.
The amount of heating is determined from the temperature information detected by 25 and transmitted to the combustion control unit 33.

In the automatic mode, the operation is always on standby, and when water flow is detected, it operates with a high temperature fixed temperature (for example, 60 ° C or 75 ° C) preset by a dip switch (not shown) as the set temperature. , In the start standby state, as in the case of prioritizing the main remote controller in the above-mentioned multi-mode, it operates only in accordance with the operating state of the main remote controller 50. When the connection state such as a short circuit between 36 and 37 is abnormal, it operates as in the case of the automatic mode and operates at the constant temperature set to the above high temperature.

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

The display control unit 35 uses the information of the selected remote controller and the combustion information detected by the frame rod 15 to turn on, off, and blink each lamp of the remote controllers 50 and 60 in accordance with the respective operating conditions. Control signals for controlling the control signals are transmitted to the remote control drive circuits 40 and 40a, respectively.

In the remote controller drive circuits 40 and 40a, the supply voltage from the 5V power source is applied to the terminals 36 and 37 via the resistors 42 and 42a, respectively, and the remote controllers 50 and 60 connected to the terminals 36 and 38 are used for detection. It is always supplied as voltage Vrem.

In addition to the detection voltage Vrem, a DC voltage from a 5V power source is directly applied to the terminals 36 and 38 of the remote controller drive circuits 40 and 40a, and the remote controller 50 and 60 are directly supplied to the remote controllers 50 and 60. The transistors 43 and 43a are connected to the terminals 36 and 38 via the diodes 44 and 44a. Further not shown
Switching transistors 45 and 45a are connected to the terminals 36 and 38 in order to directly supply the DC voltage from the 12V power source to the remote controllers 50 and 60, respectively.

In addition, switching transistors 46 and 46a are provided in front of the transistors 45 and 45a.
3, 43a, 46, 46a are controlled by the display control unit 35, respectively.

In the remote control drive circuit 40, the switching transistors 43 and 45 apply their respective voltages to the terminal 36 only when they are turned on by a control signal, and when both the transistors 43 and 45 are off, the 5V power supply Is applied to the terminal 36 via the resistor 42 as the detection voltage Vrem.

Transistor 43, which directly supplies power from the 5V power supply, and 12
Transistor 45 for directly supplying power from the V power supply
When both are off, the detection voltage Vrem from the 5V power supply is
It is applied to a series circuit including a parallel circuit of the variable resistance circuit 51 and the operation switch circuit 52 in the main remote controller 50 and the resistor 42, and the terminal 36 is combined with the variable resistance circuit 51 in the main remote controller 50 according to the operating state. The voltage division corresponding to the resistance appears as the terminal voltage V ₅₀ .

In the remote control drive circuit 40a, similarly to the remote control drive circuit 40, when the respective voltages are applied and both the transistors 43a and 45a are off, the terminal 38 receives a voltage corresponding to the operation state of the remote control 60. Appears as voltage V ₆₀ .

The display controller 35 controls the remote controllers 50 and 60 via the remote controller drive circuits 40 and 40a having the above-described configuration according to the control state of the sequence controller 31.

Control of lighting, blinking, and extinguishing of each lamp is performed depending on whether the operating state of the gas water heater 1 is in a standby state, during combustion, or when an abnormality occurs. Further, a separate display is provided for each remote controller 50, 60 depending on whether or not the remote controller is in the priority state.

Table 1 summarizes the relationship between the display states of the remote controllers 50 and 60 and the operating states of the gas water heater 1.

Hereinafter, control of the remote controller drive circuit 40 by the display controller 35 will be described. Regarding the remote control drive circuit 40a,
Describe in parentheses ().

Run lamp L2 without turning on combustion lamp L1 (L3)
Transistor 45 (45
Turn on a) and supply the power from the 12V power supply almost continuously as shown in Fig. 7.

In this case, since the set temperature signal is read from the remote controller that receives this control, the power supply from the 12V power supply is stopped for a very short time, and only the detection voltage Vrem from the 5V power supply is supplied. However, they are provided at intervals of 30 mS, 3 mS each.

Run lamp L2 (L without turning on combustion lamp L1 (L3)
In the case of blinking only 4), the transistor 45 (45a) is turned on / off according to the blinking cycle, and the power from the 12V power supply is intermittently supplied as shown in FIG. The blinking cycle at this time is, for example, 2.7 sec on and 2.7 sec off.

When both the combustion lamp L1 (L3) and the operation lamp L2 (L4) are turned on, the transistor 43 (43a) is turned on to continuously supply the power from the 5V power supply and the transistor 45 (45a) is controlled. Then, for example, pulse period 10m
With the continuous pulse of S, 5 mS is turned on and 5 mS is turned off repeatedly, and the electric power from the 12 V power source converted into the pulse is supplied together with the electric power from the 5 V power source as shown in FIG.

Also in this case, the time during which both the power from the 5V power supply and the power from the 12V power supply are stopped and only the detection voltage Vrem is supplied is provided at intervals of 3mS and 30mS.

When only the combustion lamp L1 (L3) is continuously turned on and the operation lamp L2 (L4) is blinked, as described above, it is converted into a constant pulse having a pulse period of 10 mS, for example.
While continuously supplying the power from the 12V power supply, the transistor 43 (43a) is turned on / off according to the blinking cycle, and as shown in FIG. 10, the power from the 5V electrode changes according to the blinking cycle. To control.

Combustion lamp L1 without turning on the operation lamp L2 (L4)
To make only (L3) blink, the transistor 43 (43
a) fixed to turn off the power from the 5V power supply and
As shown in the figure, the electric power from the 12V power source converted into a constant pulse having a continuous pulse period of 10 mS is intermittently supplied according to a blinking period in which 1 second on and 1 second off are repeated.

Transistor 43 (43
a) and the transistor 45 (45a) for directly supplying the power from the 12V power supply are off, and only the detection voltage Vrem from the 5V power supply is continuously supplied, the combustion lamp L1 (L3) Neither the operation lamp L2 (L4) lights up.

In each of the above-mentioned cases, even if each lamp is lit or blinking, the remote control 50
In order to be able to read the operation status of (60), as in the case of, the detection voltage Vrem from the 5V power supply
Only 3mS is supplied at intervals of 30mS.

In this case, the time for which only the detection voltage Vrem is supplied is 3m.
Since S is a very short time, it is possible to perform lighting and blinking display of each lamp without any visual problem.

In the sequence control unit 31 described above, the terminals 36, 37
When 0.05V or less is detected as the short circuit detection voltage between the transistors 43 and 45 in the remote control drive circuit 40,
In order to protect the transistor from being damaged or the like, the transistors 43 and 45 are controlled not to be turned on and the power supply is stopped.

Similarly, when 0.05V or less is detected as the short circuit detection voltage between the terminals 38 and 39, the power supply by the transistors 43a and 45a in the remote control drive circuit 40a is stopped.

The water amount control unit 34 controls the electric water amount control device 18 based on the temperature information detected by the hot water temperature thermistor 25 to limit the flow rate exceeding the heating capacity from passing through the heat exchanger 13.

Next, in the gas water heater 1 of the present embodiment having the above configuration, the priority switch SW2 of the sub remote controller 60 is opened,
The operation when the main remote controller 50 is selected in the independent mode according to the terminal voltage V ₆₀ will be described.

Based on the terminal voltage V ₅₀ , the main remote controller 50
It is detected that it is connected between 7 and it will be in the start standby state.

When the operation switch SW1 is operated, it enters the operation standby state,
As shown in FIG. 7, only the detection voltage Vrem is applied to the main remote controller 50 at a predetermined cycle, and the operation lamp L2
Lights up, and at this time, the operation lamp
L4 lights up.

At this time, the user controls the variable resistor circuit 51 of the main remote controller 50.
When the hot water outlet temperature is set by, the terminal voltage V ₅₀ according to the resistance value of the variable resistance circuit 51 is read as a set temperature signal.

At this time, the detected temperature signal of the hot water temperature thermistor 25 is also read, and the combustion amount is determined using these as the heating information.

After that, when a hot water tap (not shown) is opened, ignition is performed in a predetermined sequence, the burner group 11 is ignited, and combustion control is performed.

When the variable resistor of the remote controller is operated after ignition, the outlet heated water temperature is newly set according to the resistance value.

On the other hand, when the main remote controller 50 is selected and apparently operating in the single mode, for example, when the terminal voltage V ₅₀ is not normally detected due to lightning, etc., A signal is not transmitted correctly A disconnection condition is detected.

In this case, the fact that combustion is in progress is stored as the operating state, and the main remote controller 50 operates in the automatic mode in which it is not connected.

Therefore, the fixed temperature set in advance is set as the set temperature, the temperature control and the combustion control are performed, and the hot water supply is continued.

When such a momentary disconnection detection state returns to a normal state,
Control is performed again based on the terminal voltage V ₅₀ .

Therefore, even if there is a communication abnormality, the operation can be restored to the original operating state in a short time without stopping the operation, and the user does not feel the abnormality.

On the other hand, when a communication abnormality occurs in the operation standby state, the fact that the operation standby state is stored is stored, so that when the communication state is restored, the startup standby state is not returned.

Therefore, if the operation switch is operated to be in the operation standby state, the hot water supply can be started immediately when the water flow is detected.

As described above, according to the present invention, when there is a communication failure for a short time such as a connection state with a remote controller, the device can be used without any change.

In the above embodiments, the terminal voltage for connection with the remote controller is detected, but a microcomputer may be mounted on the remote controller to communicate with the control device.

Although water flow is detected by the water flow switch in the present embodiment, water flow may be detected by the flow rate detection signal of the flow rate sensor.

In the above embodiments, the gas water heater is shown, but a water heater provided with a combustor using other fuel such as oil, a water heater using electric heating, or another device such as an air conditioner may be used.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a functional configuration of a gas water heater control apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram showing a gas water heater according to the present embodiment. FIG. 4 is a circuit diagram showing the main remote controller of the present embodiment, FIG. 4 is a circuit diagram showing the sub remote controller of the present embodiment, and FIG. 5 is a voltage explanatory diagram showing the discrimination voltage for the main remote controller in the control device of the present embodiment. FIG. 6 is a voltage explanatory view showing a discrimination voltage for the sub remote controller in the control device of this embodiment, and FIGS. 7 to 11 are voltage waveform diagrams for lighting the lamps of the respective remote controllers. In the figure, 30 ... control device (remote control device), 36, 37 ... terminals (two terminals), 50 ... main remote control (operation part),
SW1 …… Operation switch.

Claims (1)

[Claims] 1. An automatic return type switch for instructing operation and stop of operation of equipment, and having two terminals for connecting an operation section for instructing operation and stop of operation only when the switch is operated. A remote operation device for controlling the operating state of the device in the operation standby state or the operation stop state according to the signal from the operation section transmitted via the two terminals, wherein the signal from the operation section is defective. In the case of, the operation state before detecting the transmission failure is stored and the operation is performed according to the transmission failure, and when the signal from the operation unit is restored in the transmission failure, it is stored. A remote control device which operates according to the operating state.