JPH0225626A - Control device for hot water supply apparatus - Google Patents

Abstract

PURPOSE:To make it possible to judge whether the combustion was in operation or it was stopped during power failure by providing a circuit to detect a keep relay and a circuit to detect the state of ON or OFF of this keep relay. CONSTITUTION:When the switch 16a of kitchen remote controller 10 is pressed down, a signal is taken in a storage control section 12 from 11 and the signal of operation ON is stored. With this a set coil 18 is energized and both (a) contact point 20 and (b) contact point 21 are connected to S side, and a combustion control section 13 is supplied energy from the power source and combustion action is started. Next when the switch 16a of the kitchen remote controller 10 is pressed down, a signal that I1 operation is OFF is stored in the storage control section 12 and both contact points 20 and 21 are connected to R side and the combustion action stops. Here, the signal of operation ON in the storage control section 12 is erased when power failure occurs and again the power supply is started. But since both contact points 20 and 21 are still connected to the S side, the power supply is started to a combustion control section and the combustion action is reopened, Further, the state of the storage control section 12 before the power failure can be known by the input of I3.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a control device for a water heater.

BACKGROUND OF THE INVENTION A conventional water heater control device will be described below with reference to the drawings.

FIG. 2 shows the structure of a conventional general feeding machine. Further, FIG. 3 is a diagram showing the configuration of a conventional water heater control device.

In the water heater shown in FIG. 2, reference numeral 1 denotes a combustion chamber, which is supplied with combustion air by a fan 2 driven by a fan motor 3. A nozzle 4 for spraying fuel into the combustion chamber 1 is attached to the combustion chamber 1, and fuel is supplied to the nozzle 4 by an electromagnetic pump 5. The fuel sprayed from the nozzle 4 is ignited by a spark generated at the tip of the electrode 6. An igniter 7 is connected to the electrode 6, and the spark is generated by the high voltage generated across the electrode 6 by the igniter 7. Above the combustion chamber 1 is a furnace tube heat exchanger 8.
is provided, heat generated inside the combustion chamber 1 is exchanged with water supplied from the lower water supply port 8a,
Let the hot water come out from b.

A conventional control device for controlling a water heater that performs the above operation (hereinafter referred to as "combustion operation") will be explained based on FIG. 3.

Here, 9 is a power supply, which converts AC power into DC power and supplies it to the control section. 10 is a kitchen remote control installed in the kitchen;
Reference numeral 11 denotes a bath remote controller installed in the bath, and both remote controllers 10 and 11 are connected to a storage control unit port composed of a microcomputer or the like. This storage control unit 12 electrically stores operational ON/OFF signals from the kitchen remote controller 10 and the bath remote controller. Reference numeral 13 denotes a combustion control section which controls the various devices shown in FIG. 2 to perform the above-mentioned combustion operation. Memory control section and combustion control section 1
3 is connected via a transistor 14 and a relay (hereinafter referred to as a "key relay") 22. The transistor 14 is connected to the storage control section ratio through a current limiting resistor 15 at its base, and the 01 output on the storage control section transmits the power of the Wl power supply to the combustion control section. The keep relay n has a set coil slide connected to the memory control section port, a reset coil 19 connected to the combustion control section B, and an a contact point.

Both remote controllers 10 and 1.11 are switches 16a and 16b that are manually pressed when performing the combustion control operation of the water heater.
These switches 16a and 16b are configured so that their contacts close only when they are pressed.In addition, both remote controllers 10 and 11i are provided with an operation lamp 17 that indicates the operating status during combustion operation. a, 17 b
and abnormality display lamps 23a and 23b are provided.

The operation of the conventional water heater control device configured as described above will be described below.

When the switch 16a of the kitchen remote control 10 is pressed, its operation lamp 17a and the operation lamp 17b of the bath remote control 11 light up, and a signal to turn on the operation is inputted manually by the worker 1 at the memory control section. Stored within the memory control minister. At the same time, the output of 03 goes "Low" for several seconds.
J, and set coil m is energized. This results in
If the a contact is connected to the R side, it is connected to the S side and that state is maintained. And the output of 01 becomes "Low J", and conduction occurs between the collector and emitter of the transistor 14.As a result, power is supplied from the power supply 9, the combustion control section is operated, and the water heater performs a combustion operation to start the furnace. The water in the cylindrical heat exchanger 8 is heated.

Next, when the switch 16b of the bath remote control 11 is pressed,
The operation lamp 17b and the operation lamp 17a of the kitchen remote controller 10 are turned off, an operation-off signal is input from the input 12 of the memory control section, and the combustion operation is subsequently stopped in the opposite manner to the operation when the operation is on.

Here, if an abnormality occurs in the combustion of the water heater, for example, the fire goes out, the abnormal output OKI of the combustion control section 13
becomes "LOW", and the reset coil 19 is energized and a
Contact I is connected to the R side, and power to combustion control section B is cut off. As a result, the combustion operation is stopped, and at the same time, the A contact is connected to the R side, and the abnormality indicator lamps 23a and 23b of the kitchen remote control 10 and the remote control 11 are lit.

Problems to be Solved by the Invention In the conventional configuration as described above, when the water heater is exposed to an atmosphere where the temperature drops below freezing, the water in the furnace tube heat exchanger 8 freezes and the equipment is damaged. prevent from doing
Sometimes, the water heater is maintained in a combustion operating state (hereinafter referred to as "anti-freezing operation").

However, in the conventional control device, if a power outage occurs during the anti-freeze operation, the memory control section is reset and the operation-on signal is erased.

Therefore, even if electricity is restarted, the water heater remains stopped, and the temperature inside the furnace-tube heat exchanger 8 drops and freezes, which may damage the equipment. As a countermeasure for this, driving.

There is a method of mechanically locking the switches 16a and 16b for stopping, but if this method is used, a problem arises in that it is not possible to start and stop the motor at will from a plurality of locations.

Therefore, it is an object of the present invention to solve the problem σ) and to enable the antifreeze operation to be resumed after the power outage is resolved, even if a power outage occurs during the antifreeze operation.

Means for Solving the Problems In order to achieve the above object, the water heater control device of the present invention comprises:
The water heater operates by detecting the operation of the tact switch from the operation parts installed at multiple locations.

A memory control unit that switches stop, a keep relay that is driven by a signal from the memory control unit and mechanically maintains the operating and stopped states, and a combustion control that operates by applying a TC source to the contact point of the keep relay. The keep relay is configured to be switched to an off state by a combustion abnormality signal from the combustion control unit, and further includes a detection unit that detects the on or off state of the keep relay by another contact in the keep relay. The memory control unit is configured to be able to re-store the operation and stop signal before the stop 2 based on the detection signal of the on/off state of the keep relay by the detection circuit when the power is re-energized after a power outage. It is what was done.

Effect of the Invention The present invention has the above-mentioned structure and is equipped with a keep relay and a circuit that detects the on/off state of this keep relay, so it is possible to determine whether combustion operation was in progress or stopped at the time of a power outage, and based on this determination result, a power outage occurs. driving of time,
The stop signal is stored in the storage controller again. Therefore, when a power outage occurs during anti-freezing operation and is subsequently restored, the state of anti-freezing operation is maintained and damage to the equipment is prevented. In addition, the keep relay, which switches to the OFF state and stops combustion operation in response to an abnormal signal from the combustion control unit, also detects the operating status during a power outage, so one keep relay is used for both abnormality detection and anti-freezing. It will be shared.

Embodiment Hereinafter, a water heater control device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram of a control device for a water heater in an embodiment of the present invention. In FIG. 1, members having the same functions as those in FIG. 3 are given the same numbers.

In FIG. 1, reference numeral 21 is the b contact of the keep relay n, the S side of which is connected to the "High J" side of the power source 9, and the R side thereof connected to the "Low" side of the power source 9. Further, the b contact 21 is connected to the 13 human power of the memory control unit. Due to this kind of keep relay,
A signal holding unit is configured during a power outage.

The operation of the water heater control device configured as described above will be described below with reference to FIG. 1.

In FIG. 1, when the switch 16a of the kitchen remote control 1o is pressed, the operation lamp 17a and the bath remote control 1
1's operation lamp 17b lights up, and there is a factory 1 in the storage control department school.
A signal is captured from the controller, and the drive-on signal is stored.

This causes the output of dl to become 1'-LowJ for several seconds,
The set coil is energized.

Then, both the a contact z and the b contact 21 are connected to the S side. After a few seconds, the energization to the set coil is stopped, but both the a contact n and the b contact 21 remain connected to the S side, and the combustion control unit 131CrrL source is supplied to start the combustion operation.

Next, when the switch 16a of the kitchen remote control 10 is pressed,
The operation lamp 17a and the operation lamp 17b of the bath remote controller 11 are turned off, and a signal is taken into the memory control unit 11, and the operation-off signal is stored. As a result, the output of 02 becomes 1'-LowJ for several seconds, and the reset coil 19 is energized. Then, a contact z, b contact 21
Both contacts are connected to the R side. After a few seconds, the power supply to the reset coil 19 is stopped, but both the a contact Z and the b contact ■ remain connected to the R side, and the power to the combustion control section ratio is cut off, and the combustion operation is stopped.

Here, the contacts A contact I and B contact 21 are connected to the S side, and if a power outage occurs while anti-freezing operation (combustion operation state) is being performed and energization is restarted, , the operation-on signal will be erased from the memory control unit pressure. However, the A contact and the B contact 21 are mechanically held and S
The combustion control unit ratio is energized again, and the combustion operation is restarted. Furthermore, the storage control department stores the operation-on signal again by knowing the state before the power outage from the input of I3. Naturally, when the power is restored from a state where the combustion operation is stopped, the state where the combustion operation is stopped is maintained.

Among the control operations of the combustion control unit 13, for the sake of safety and prevention of damage to equipment, ■ stopping the combustion operation when there is no water in the furnace tube heat exchanger 8; ■ stopping the combustion operation when there is an abnormality in the water heater; When vibration is applied, there are operations such as stopping the combustion operation, but in this embodiment, this operation is common to the signal holding operation during a power outage. That is, when the above abnormality occurs, the output of the combustion control section 13? 1 in 5
becomes "LOW", the reset relay 19 is energized, the A contact point is connected to the R side, and the combustion control section 13
The power supply to the engine will be cut off, and the combustion operation will stop. At this time, the operation-on signal is stored in the memory control unit, and the b contact 21 is connected to the R side, so that the input of I3 is l.
'-LowJ, it is determined that there is an abnormal state, and the kitchen remote control 10. Abnormality indicator lamp 23a of bath remote control 11.

23b is turned on.

By providing a signal holding section during power outage as described above,
If the power is reenergized after a power outage during antifreeze operation, antifreeze operation can be restarted again.
Prevents damage to equipment due to freezing.

Effects of the Invention As described above, according to the present invention, by providing a signal holding section during a power outage, it is possible to restart the antifreeze operation when the power is reenergized after a power outage during the antifreeze operation. Therefore, damage to equipment due to freezing can be prevented.

In addition, the keep relay as a signal holding unit is activated by the abnormal signal from the combustion control unit, so one keep relay can be used for both abnormality detection and antifreeze purposes.
It can be an inexpensive configuration.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a water heater control device according to an embodiment of the present invention, Fig. 2 is a block diagram of a conventional water heater controlled by the control device of Fig. 1, and Fig. 3 is a block diagram of a conventional water heater. FIG. 2 is a configuration diagram of a control device of FIG. 9...Power source, 10...Kitchen remote control, 11...Bath remote control, Hill...Storage control section,...Combustion control section, lQa, 16b...Switch, 17a, 17b...
・Operation lamp, sliding...Set coil, 19...Reset coil, I...A contact, 21...B contact, ρ・
...Keep relay 23a, 23b...Error indicator lamp.

Claims (1)

[Claims] 1. A memory control unit that detects the operation of a tact switch from an operation unit provided at a plurality of locations and switches the water heater on and off, and is driven by a signal from the memory control unit,
The keep relay is equipped with a keep relay that mechanically maintains the operating and stopped states, and a combustion control unit that is powered by the contacts of the keep relay and operates, and the keep relay is activated by a combustion abnormality signal from the combustion control unit. It is configured to switch to the OFF state, and further includes a detection circuit that detects the ON/OFF state of the keep relay using other contacts in the keep relay, and the storage control unit is configured to switch to the OFF state when the keep relay is turned on again after a power outage.
A water heater control device configured to be able to re-store operation and stop signals before a power outage based on a detection signal of an on/off state of the keep relay by the detection circuit.