JPH0322689Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a reset circuit for hot water appliances such as bathtubs, water heaters, and water heaters with bathtubs.

(Prior Art) Conventionally, in hot water appliances, when a safe operation is performed due to undetected wind pressure, non-ignition, etc., a reset switch independent of the operation switch is provided to reset the safe operation, and this reset switch is operated. There is a configuration in which the reset coil of the keep relay is energized to perform the reset when the operation switch is operated to the stop side, as shown in Japanese Patent Laid-Open No. 53-148729.

(Problem to be solved by the invention) However, the above conventional method requires a signal line to transmit the signal output from the stop side terminal of the reset switch or operation switch from the operation section to the main controller, which is disadvantageous in terms of cost. It is something.

(Purpose of the invention) In view of the above-mentioned circumstances, it is an object of the present invention to provide an inexpensive reset device for hot water appliances that allows safe operation to be reset by operating an operation switch.

(Example) The following will be explained based on an example shown in the drawings. FIG. 1 shows a schematic configuration of a water heater with a bath pot. A gas burner 4 serving as a heat source is provided, a fan 5 for sending combustion air to the gas burner 4, and a gas valve 6 for controlling the supply of combustion gas.

FIG. 2 shows the control circuit used in FIG. 1,
A indicates a remotely installed operating section, and B indicates a main body controller provided within the main body 1.

The operation section A is provided with a hot water supply operation switch 8 that controls the operation of the hot water supply heating circuit 2 and a bath operation switch 9 that controls the operation of the bath heating circuit 3. Both switches 8 and 9 are automatic return type push switches. These outputs are input to a hot water supply operation switch circuit 12 and a bath operation switch circuit 13 in the main body controller B via signal lines 10 and 11, respectively.
Both switch circuits 12 and 13 input a one-pulse signal output by pressing the operation switch described above and reverse the output state. For example, in a stopped state, inputting a pulse signal issues a running command, and in a running state, a running command is issued. Sequence control circuit 14 using a microcomputer to issue a stop command with a pulse signal
It is configured to output to . 15 is a safe operation reset circuit, which is a hot water supply operation switch circuit 1 during safe operation.
2 or a change in the output from the bath operation switch circuit 13, the sequence control circuit 14 is made to output a reset signal.

In the above configuration, while at least one of the heating circuits is in operation, a signal indicating that wind pressure is not detected, ignition is not detected, etc. is input to the sequence control circuit 14, and the control circuit 14
When an abnormality is determined in the control circuit 14
Operation output from the gas valve to the load such as the gas valve is stopped and safe operation is performed. During this safe operation, command inputs from the hot water supply operation switch circuit 12 and the bath operation switch circuit 13 are not processed, and a safe operation activation signal is output to the safety operation reset circuit 15. At this time, the safety operation reset circuit 15 receives the state change output of the switch circuits 12, 13 based on the pressing operation of one of the operation switches 11, 12, and outputs a reset signal to the sequence control circuit 14. The safety operation is reset by inputting such a reset signal, and the combustion control operation becomes possible again.

In the above embodiment, the reset can be performed by operating any one of the hot water supply operation switch 8 and the bath operation switch 9, but the hot water supply operation switch is provided in both the kitchen operation section and the bathroom operation section. In this case, the resettable switch may be limited to the hot water supply operation switch, in which case the reset operability is not impaired and the configuration of the control circuit can be simplified.

In addition, the output pulse signals of the operation switches 8 and 9 may be input directly to the safety operation reset circuit 15 without passing through the operation switch circuits 12 and 13. It may also be incorporated into a microcomputer that constitutes the control circuit 14.

(Effects of the invention) As described above, according to the invention, the operation section is provided with operation switches for hot water supply operation and bath operation that output pulse signals for each pressing operation, and output pulse signals from each operation switch. A sequence control circuit that alternately controls the start and stop of hot water supply and bath operation each time the water supply is received, and operates during safe operation of this sequence control circuit, and is activated in response to at least the output pulse signal from the operation switch for hot water supply operation. Since the control circuit is equipped with a safe operation reset circuit that outputs a reset signal for safe operation, the operation switch can also be used as a reset switch during safe operation, and there is no need to provide a signal line dedicated to reset operation, making it inexpensive. In addition, the reset operation is easy as it only requires pressing the operation switch once.

[Brief explanation of the drawing]

Figure 1 is an overall configuration diagram showing a water heater with a bath pot.
FIG. 2 is an electrical circuit diagram showing an embodiment of the present invention. 8... Operation switch (hot water supply operation switch), 9
...Driving switch (bath operating switch), 14...
...Sequence control circuit, 15...Safe operation reset circuit.

Claims (1)

[Scope of utility model registration request] The operating section is equipped with operation switches for hot water supply operation and bath operation that output pulse signals each time a press is operated, and the hot water supply and bath operation can be started and stopped alternately each time an output pulse signal is received from each operation switch. A sequence control circuit to be controlled, a safe operation reset circuit that operates when the sequence control circuit is in safe operation and outputs a safe operation reset signal to the sequence control circuit in response to at least an output pulse signal from the hot water supply operation switch. A reset circuit for a hot water appliance, characterized by comprising: