JP2712667B2 - Hot water heating system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hot water heating apparatus using water as a heat medium.

2. Description of the Related Art As shown in FIG. 3, a conventional hot water heating apparatus heats an expansion tank 1 for hot water, a pump 2 for circulating hot water connected to an outlet of the tank 1, and a heating pump connected to the circulation pump 2. Heat exchanger 3 and a heater 4 for heating the heat exchanger 3
And a water injection valve 5 for injecting or stopping water in the expansion tank 1. A plurality of water level detectors 6, 7, and 8 are installed in the expansion tank 1, and each has a high water level,
Detects middle and low water levels. Then, the water level signals detected by the water level detectors 6, 7, 8 are input by the water level signal input means 9 and transmitted to the operation control means 10 as water level data. The operation control means 10 controls the operation based on the input water level data. When the water level in the expansion tank 1 decreases and the middle water level detector 7 is turned off, the water injection valve 5 is opened to inject water into the expansion tank 1, whereby the water level is increased. Rises and the high water level detector 6 is turned on, the water injection valve 5 is closed and the water is stopped.

Then, when water is first charged into the expansion tank 1 due to a test operation or the like, it is necessary to remove air since air is contained in the hot water pipe of the circulation system. (Hereinafter, this is referred to as air purge.) When air purge is performed, the switch 11 is turned on, and if water is contained in the expansion tank, the circulation pump 2 is rotated.
Perform air purge of the circulation system. Thereby, when the water level becomes low, the circulation pump is stopped, idling is prevented, and the water injection valve 5 is opened to pour water into the expansion tank 1. When the water level rises, the water injection valve 5 is closed to stop the water supply, and the circulation pump 2 is rotated to perform the air purge.

FIG. 2 shows an operation flow sequence at the time of this air purging.

However, in the conventional air purge sequence, when the room temperature monitoring unit 13 including the room temperature detector 13a and the temperature setting unit 13b shown in FIG. 3 determines that the temperature setting is lower than the room temperature. However, there has been a problem that the air purge cannot be performed particularly during a test run in summertime without opening the hot water valve 12.

In view of the above problems, an object of the present invention is to make it possible to easily perform an air purge during a test run even in summer.

Means for Solving the Problems To solve the above problems, a hot water heating apparatus of the present invention comprises a hot water expansion tank, a hot water circulation pump connected to an outlet of the tank, and a hot water circulation pump connected to the circulation pump. A heat exchanger that heats the heat exchanger, a heater that heats the heat exchanger, a room temperature monitoring unit that has a room temperature detector and a temperature setting unit, and issues an operation ON / OFF signal according to a difference between the room temperature and the set temperature. A water injection valve for injecting or stopping water in the expansion tank;
A plurality of water level detectors installed in the expansion tank, a plurality of water level signals from the water level detector, input water level signal input means for outputting water level data, and input water level data from the water level signal input means, When the water level of the expansion tank is low, the water injection valve is opened, and when the water level is high, the water injection valve is closed, and the ON / OFF of the hot water circulation pump and the heater is controlled by receiving a signal from the room temperature monitoring means. At the same time, the operation control means for controlling the opening and closing of the hot water valve in the hot water circuit, and the circulation pump is rotated independently of the signal from the room temperature monitoring means to open the hot water valve and perform air purging in the hot water circuit. Switch.

Effect of the Invention According to the above configuration, when the switch is turned on during the test operation, regardless of the magnitude of the room temperature, the hot water valve is opened first, and if water is contained in the expansion tank, the circulation pump is rotated, and the circulation system is rotated. Air purge. Thereby, when the water level becomes low, the circulation pump is stopped, idling is prevented, and a water injection valve is opened to pour water into the expansion tank.
Then, when the water level rises, the water injection valve is closed to stop the water, and the circulating pump is rotated to perform the air purge.

Embodiment An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a hot water heating apparatus according to an embodiment of the present invention, and FIG. 2 is a flowchart of the same operation. Only the operation control means 15 is different from the conventional example of the present invention. That is, the switch
Turning on 11 opens the hot water valve 12. In normal operation (when the switch 11 is not turned on), the room temperature monitoring unit 13 sends a signal to the operation control unit 15 based on the magnitude relationship between the room temperature detected by the room temperature detector 13a and the temperature set in the temperature setting unit 13b. The operation control means 15 receives the signal and opens the hot water valve 12 only when the temperature setting is higher than room temperature. However, when the switch 11 is turned on during the test operation, the hot water valve 12 is opened regardless of the signal from the room temperature monitoring means 13. If there is no water in the expansion tank 1 and the low water level detector 8 is off, the water injection valve 5 is opened. Fill the expansion tank 1 with water. Then, when the water level rises and the high water level detector 6 is turned on, the water injection valve 5 is closed to stop water, and at the same time, the circulating pump 2 is rotated, thereby turning on the hot water circuit.
14 Remove the air inside. As a result, when the water level in the expansion tank 1 drops significantly and the low water level detector 8 is turned off, the circulation pump 2 is stopped, and the water injection valve 5 is opened to inject water. By repeating this, air purge of the circulation system is performed.

Therefore, by turning on the switch 11, the air purge can be automatically completed even in summer, regardless of the room temperature.

Effects of the Invention As described above, according to the present invention, the air purge in the hot water circuit can be easily performed simply by turning on the switch, without performing an operation such as setting the temperature higher than room temperature.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the hot water heating apparatus according to the present invention, FIG. 2 is a flowchart of the test run, FIG. 4 is a conventional flowchart, and FIG. DESCRIPTION OF SYMBOLS 1 ... Expansion tank, 2 ... Hot water circulation pump, 3 ... Heat exchanger, 4 ... Heater, 5 ... Water injection valve, 6, 7, 8 ... Water level detector, 9 ... Water level signal input means , 15 ... operation control means, 11 ... switch, 12 ... hot water valve, 13 ... room temperature monitoring means, 13a ... room temperature detector, 13b ... temperature setting section.

Claims (1)

(57) [Claims] 1. An expansion tank for hot water, a pump for circulating hot water connected to an outlet of the tank, a heat exchanger connected to the circulation pump for heating hot water, and a heater for heating the heat exchanger. A room temperature monitoring means having a room temperature detector and a temperature setting unit, and issuing an operation ON / OFF signal according to a difference between the room temperature and the set temperature; a water injection valve for injecting or stopping water in the expansion tank; A plurality of installed water level detectors, water level signal input means for inputting a plurality of water level signals from the water level detector and outputting water level data, and inputting water level data from the water level signal input means, When the water level is low, the water injection valve is opened, and when the water level is high, the water injection valve is closed, and at the same time as receiving the signal of the room temperature monitoring means, controlling the on / off of the hot water circulation pump and the heater,
Operation control means for controlling the opening and closing of the hot water valve in the hot water circuit, and for rotating the circulation pump independently of the signal from the room temperature monitoring means to open the hot water valve and perform air purging of the circulation system of the hot water. A hot water heating device provided with a switch.