JPH11101450A - Hot water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance operability by controlling low temperature heating based on temperature information from a temperature sensor for high temperature heating control upon failure of a temperature sensor for low temperature heating control thereby preventing shutdown of low temperature heating. SOLUTION: When heating operation is started by means of a heating switch and low temperature heating using a hot water floor mat is selected, a thermal valve thereof is opened (S1) and the hot water temperature is detected by a low temperature heating control thermistor and inputted to a microcomputer (S2). Low temperature hot water is the circulated based on that information and the temperature of low temperature heating is controlled. The operation is repeated when the thermistor us not failed (S1-S3) and failure is indicated at an error indicating section upon occurrence (S5). In place of the failed thermistor, a high temperature heating control thermistor functions to control low temperature heating (S6). Based on the hot water temperature information detected by the thermistor, low temperature hot water is circulated through a hot water mat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-temperature type hot-water heating apparatus for performing high-temperature heating (fan coil unit and the like) and low-temperature heating (floor heating such as a hot-water floor mat).

[0002]

2. Description of the Related Art In general, a temperature sensor for controlling high-temperature heating, which includes a heat source unit to which a hot water circuit for high-temperature heating and a hot-water circuit for low-temperature heating is connected, and measures a temperature of hot water during high-temperature heating, Controls high-temperature heating based on temperature information from a low-temperature heating control temperature sensor that measures the temperature of hot water and high-temperature heating control temperature sensor, and controls low-temperature heating based on temperature information from a low-temperature heating control temperature sensor. 2. Description of the Related Art A two-temperature hot-water type heating apparatus having a control means for controlling heating is known.

[0003] In this type of hot water type heating device, it is general that a fan coil unit or the like for high temperature heating and a hot water floor mat or the like for low temperature heating are connected to the heat source unit. It is. When hot water is passed through a fan coil unit or the like to perform high-temperature heating, the temperature of the hot water is controlled based on the detected temperature of a thermistor for high-temperature heating control, and when hot water is passed through a hot-water floor mat or the like for low-temperature heating. Generally, the hot water temperature is controlled based on the detected temperature of a thermistor for low-temperature heating control.

[0004]

However, the conventional configuration has a problem that if the thermistor for low-temperature heating control fails, low-temperature heating cannot be operated. Therefore, if the thermistor for low-temperature heating control breaks down,
There was a problem that low-temperature heating could not be performed from the occurrence of the failure until the repair was completed, and the usability was poor.

[0005] The present invention has been made in view of the above situation,
An object of the present invention is to provide a hot-water type heating device that enables low-temperature heating from the occurrence of a sensor failure for low-temperature heating control to completion of repair, thereby improving usability.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 comprises a heat source unit to which a hot water circuit for high-temperature heating and a hot water circuit for low-temperature heating are connected, A high-temperature heating control temperature sensor that measures the temperature of hot water, a low-temperature heating control temperature sensor that measures the temperature of hot water during low-temperature heating, and a high-temperature heating based on temperature information from the high-temperature heating control temperature sensor And controlling means for controlling low-temperature heating based on temperature information from the temperature sensor for low-temperature heating control, when the temperature sensor for low-temperature heating control fails, the control means: The low-temperature heating is controlled based on temperature information from a high-temperature heating control temperature sensor.

According to the first aspect of the present invention, when the temperature sensor for the low-temperature heating control fails, the temperature sensor for the high-temperature heating control works instead, and the temperature information from the high-temperature heating control temperature sensor is used. Based on this, low-temperature heating becomes possible.

According to a second aspect of the present invention, in the first aspect, when one of the high-temperature heating control temperature sensor and the low-temperature heating control temperature sensor fails,
It is configured to display an error.

According to the second aspect of the present invention, it is possible to surely notify an inspection worker or a user that one of the temperature sensor for high-temperature heating control and the temperature sensor for low-temperature heating control has failed. Can be.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a hot water type heating apparatus according to the present invention. Reference numeral 30 denotes a heat source unit. The heat source unit 30 includes a hot water floor mat 11 for low-temperature heating and a hot water air conditioner 4 for high-temperature heating.
And are connected. The heat source device 30 includes a hot water tank 5.
Is housed. The hot water tank 5 is connected to a hot water circulation pump 7 via a pipe 6a, and the hot water circulation pump 7 is connected to the heat exchanger 1 via a pipe 6b.

A gas burner 2 is attached to the heat exchanger 1, and the heat of combustion by the gas burner 2 is supplied to the heat exchanger 1 by a combustion fan 22 to heat the hot water in the heat exchanger 1. A hot water air conditioner 4 having a high-temperature load is connected to the heat exchanger 1 via a pipe 6c. A bypass pipe 21 for returning a part of the hot water heated by the heat exchanger 1 to the hot water tank 5 is connected to the pipe 6c. The bypass pipe 21 is connected to a pipe 6d. 6d is connected to the hot water tank 5. The above constitutes the hot water circuit for high temperature heating. A hot water control valve 10 is connected to an outlet pipe 6b of the hot water circulation pump 7 via a pipe 6e. Each of the heat operated valves 10A and 10B of the hot water control valve 10 has a Are respectively connected. These constitute a low-temperature heating hot water circuit.

Reference numeral 20 denotes a remote controller, which is electrically connected to the control board CB and can remotely control the operation of starting and stopping the combustion of the equipment. Reference numeral 13 denotes a water level electrode disposed in the hot water tank 5, and reference numeral 14 denotes a water supply conduit for guiding water to the hot water tank 5, and includes a water injection electromagnetic valve 15 serving as an automatic water supply device.

The heat source unit 30 includes a thermistor (temperature sensor) for low-temperature heating control for measuring the temperature of hot water during low-temperature heating.
8 and a thermistor (temperature sensor) 25 for high-temperature heating control for measuring the temperature of hot water during high-temperature heating. The thermistor 8 for low-temperature heating control is provided in the pipe line 6b on the outlet side of the hot-water circulation pump 7, and measures the temperature of the low-temperature hot water of, for example, 60 ° C. The low-temperature hot water is sent from the hot water tank 5 via the hot water circulation pump 7, and is returned to the hot water tank 5 through the pipe 6 e and the hot water floor mat 11 without passing through the heat exchanger 1. The thermistor 25 for high-temperature heating control is provided in the pipe 6c on the outlet side of the heat exchanger 1, and detects a high-temperature hot water temperature of, for example, 80 ° C. After being heated in the heat exchanger 1, the high-temperature hot water is returned to the hot water tank 5 through the pipe 6 c and the hot water air conditioner 4.
Fuel is supplied to the gas burner 2 through a fuel line 17. A gas proportional valve 16, a gas solenoid valve 18, a source gas solenoid valve 19, and the like are connected to the fuel line 17.

Next, referring to FIG. 2, an object to be controlled by the hot water type heating apparatus and a microcomputer 10 as a control means will be described.
0 will be described.

The microcomputer 100 is mounted on a control board CB (FIG. 1). The microcomputer 100 is connected to a heating switch 40, a thermistor 8 for low-temperature heating control, a thermistor 25 for high-temperature heating control as information input means, and an error display unit 41 as means for displaying error information. The error display section 41 is provided on at least one of the remote controller 20 and the heat source device 30.

The microcomputer 100 includes:
Gas burner 2, hot water circulation pump 7,
A combustion fan 22, a thermal valve 10A on the hot water floor mat 11 side,
10B and the like are connected. Microcomputer 100
Controls the degree of opening of the gas proportional valve 16 and the like based on temperature information from the thermistor 25 for high-temperature heating control or the thermistor 8 for low-temperature heating control, and controls hot water temperature and the like.

Next, a control flow of the hot water heating apparatus will be described with reference to FIG. When the heating switch 40 shown in FIG. 2 is pressed, the heating operation is started. In step S1,
When low-temperature heating using the hot-water floor mat 11 is selected, the thermal valves 10A and 10B of the hot-water floor mat 11 are opened according to a command from the microcomputer 100.

In step S2, the temperature of the hot water detected by the low-temperature heating control thermistor 8, which measures the temperature of the hot water during low-temperature heating, is input to the myco-computer 100.
In step S3, low-temperature hot water is circulated through the hot-water floor mat 11 based on the detected hot-water temperature information, and the temperature of low-temperature heating is controlled.

Here, if the low-temperature heating control thermistor 8 has not failed, steps S1 to S3 are repeated. If the low-temperature heating control thermistor 8 has failed, the process proceeds to step S5. Microcomputer 1
00 causes the error display section 41 to display that the low-temperature heating control thermistor 8 has failed.

In step S6, a thermistor 25 for high-temperature heating control is operated for low-temperature heating control in place of the failed low-temperature heating control thermistor 8. That is,
The hot water temperature detected by the high-temperature heating control thermistor 25 is input to the microcomputer 100, and in step S7, low-temperature hot water is circulated through the hot-water floor mat 11 based on the detected temperature information, and low-temperature heating is performed. Temperature is controlled.

The microcomputer 100 controls the low-temperature heating and terminates in steps S8 and S9. If the temperature control of the low-temperature heating is repeated without terminating the control, the microcomputer 100 proceeds to step S1.
And the steps S1 to S7 are repeated.

On the other hand, if the high-temperature heating operation is selected in step S1, the hot water temperature detected by the high-temperature heating control thermistor 25 is input to the microcomputer 100 in step S10. In step S11, the microcomputer 100 controls the temperature of high-temperature heating by circulating high-temperature hot water of, for example, 80 ° C. in the hot-water air conditioner 4 based on the detected temperature. Here, in step S12, the thermistor 25 for high-temperature heating control
If a failure has occurred in step S13, the microcomputer 100 causes the error display section 41 to display that the thermistor 25 for high-temperature heating control has failed in step S13.
At 14, the high-temperature heating operation is stopped.

According to this embodiment, when the temperature sensor 8 for low-temperature heating control fails, the temperature sensor 25 for high-temperature heating control works instead, and the temperature information from the temperature sensor 25 for high-temperature heating control is used. , Low-temperature heating becomes possible. Therefore, from the occurrence of a failure in the temperature sensor 8 for low-temperature heating control to the completion of the repair, the low-temperature heating operation cannot be disabled, and the usability can be improved.

Further, the microcomputer 100 displays an error indicating that a failure has occurred on the error display section 41.
It is possible to reliably know that one of the temperature sensor 25 for high-temperature heating control and the temperature sensor 8 for low-temperature heating control has failed.

The description of the specific embodiment has been completed.
The present invention is not limited to the embodiments described above.
For example, in the above embodiment, a thermistor is used as a temperature sensor for high-temperature heating control and for low-temperature heating control,
It goes without saying that other types of temperature sensors can be used.

[0027]

As described above, according to the first aspect of the present invention, when the temperature sensor for the low-temperature heating control fails, the temperature sensor for the high-temperature heating control works in place of the temperature sensor for the high-temperature heating control. Based on the temperature information from the temperature sensor
Low temperature heating becomes possible. Therefore, from the occurrence of the failure of the temperature sensor for low-temperature heating control to the completion of the repair, the low-temperature heating operation cannot be disabled, and the usability can be improved.

According to the second aspect of the present invention, the failure of one of the temperature sensor for the high-temperature heating control and the temperature sensor for the low-temperature heating control can be reliably notified to the inspection worker or the user. I can let you know.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a hot water heating device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a control object and control means of the same hot water type heating device.

FIG. 3 is a flowchart showing control of the hot water type heating device.

[Explanation of symbols]

 4 Hot Water Air Conditioner 8 Low Temperature Heating Control Thermistor (Temperature Sensor) 11 Hot Water Floor Mat 25 High Temperature Heating Control Thermistor (Temperature Sensor) 30 Heat Source Unit 41 Error Display Unit 100 Microcomputer (Control Means)

Claims (2)

[Claims] 1. A high-temperature heating control temperature sensor for measuring a temperature of hot water during high-temperature heating, comprising: a heat source device to which a high-temperature heating hot water circuit and a low-temperature heating hot-water circuit are connected; Controls high-temperature heating based on temperature information from the low-temperature heating control temperature sensor that measures the temperature and high-temperature heating control temperature sensor, and controls low-temperature heating based on temperature information from the low-temperature heating control temperature sensor. A control unit that controls the low-temperature heating based on the temperature information from the high-temperature heating control temperature sensor when the low-temperature heating control temperature sensor fails. A hot water type heating device characterized by the above-mentioned. 2. The hot water heating apparatus according to claim 1, wherein an error is displayed when one of the high-temperature heating control temperature sensor and the low-temperature heating control temperature sensor fails.