JPH0711338B2 - Hot water heater - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hot water heater for circulating hot water between a water heater and an indoor radiator.

[Prior art]

In a commonly used hot water heater that supplies hot water heated by a water heater to an indoor radiator to heat the room and returns the hot water after radiation to the water heater, the heating water is used before heating. It is necessary to fill the circuit with water and fill the heating water circuit with water.

Conventionally, in order to fill the heating water circuit with water, only the circulating pump of the heating water circuit is operated, and the test operation mode without burning the water heater has been set. It was filled with water.

In this test run mode (see Fig. 3), when the test run switch is turned on, a water level detection switch such as a float switch that detects the presence of water in the expansion tank arranged in the heating water circuit is turned on, and the circulation pump Is started.

At this time, fuel is not supplied to the combustor of the water heater and combustion is not performed.

When the heating water circuit is full, the water level in the expansion tank rises, the water level detection switch is turned off, and the circulation pump is stopped.

[Problems to be Solved by the Invention] However, in the above-described conventional test operation mode, it takes a long time to fill the heating water circuit, and particularly when it is installed in an apartment house or the like, heating of a plurality of houses is performed. Since the construction is done at the same time, it is often necessary to fill the water of multiple heating water circuits at the same time, forgetting to turn off the test operation switch and cancel the test operation mode,
There was a problem that the trial run switch might be left on.

If you do not release the trial run mode, water supply will not be stopped,
This causes problems such as the possibility that makeup water may overflow.

An object of the present invention is to solve the above problems and provide a hot water heater capable of reliably releasing the test operation mode when the filling of the heating water circuit is completed, even when forgetting to release the test operation mode. That is.

[Means for Solving the Problems]

In order to achieve the above object, the hot water heater of the present invention is started by turning on a test operation switch in a test operation mode in which the heating water circuit is filled with water, and after a lapse of a predetermined time, the circulation pump is stopped and the automatic supply water valve It is provided with a timer for closing the test operation mode and releasing it.

[Action]

In the hot water heater of the present invention configured as described above, when the test operation switch is turned on to start the test operation mode in which the heating water circuit is filled with water, the automatic replenishment water valve is opened to automatically replenish water. When the circulation pump is started, the water filling of the heating water circuit is started, and the timer is started.

When a preset predetermined time has elapsed after the timer was started, the circulation pump is stopped and the automatic make-up water valve is closed to cancel the trial operation mode.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

Referring to FIG. 2, a hot water heater to which the present invention is applied will be described. The water heater 1 includes a heat exchanger 10, a burner 11 arranged below the heat exchanger 10, and a control valve for controlling the fuel gas amount to the burner 11.
12 and a combustion fan 13.

The outgoing pipe 21 is connected to the hot water outlet side outlet of the heat exchanger 10, and the outgoing pipe 21 is provided with a plurality of branch pipes 31, 31 via the first header 30.
And the branch pipes 31 and 31 are connected to the inlet sides of the heat radiation heat exchangers 32 and 32 of the indoor radiators 3 and 3, respectively.

In the heat radiating heat exchangers 32, 32, the low temperature water after heating the air supplied by the heat radiating fans 33, 33 is collected from the branch pipes 34, 34 to the second header 35, and is returned from the return pipe 22 to the expansion tank 4
Sent to.

The low temperature water in the expansion tank 4 is transferred from the water inlet pipe 23 to the heat exchanger 10 of the water heater 1 by the circulation pump 5 provided in the water inlet pipe 23.
Sent to the cold water side inlet of.

The expansion tank 4 includes a makeup water pipe 24 and an overflow pipe 41.
Is connected, and the makeup water pipe 24 is provided with an automatic makeup water valve 7.

A water level detection switch 6 is arranged in the expansion tank 4, and the water level detection switch 6 is composed of electrodes for high water level (H), medium water level (M), and low water level (L). .

Next, a test operation mode in which the heating water circuit is filled with water before the heating operation is started will be described with reference to the flowchart of FIG.

When the trial run switch is turned on, the trial run mode is entered, and the automatic replenishment water valve 7 opens to start automatic replenishment of water.
A timer installed in a controller (not shown) or the like starts.

Within a predetermined time preset in the timer, the water level detection switch 6 causes the water level in the expansion tank 4 to reach a predetermined low water level (for example, a water level between the low water level L and the medium water level M or a low water level L).
And the like), the circulation pump 5 is started, water is supplied into the heating water circuit, and water filling is performed.

When the heating water circuit is filled with water, the water level in the expansion tank 4 also rises. Therefore, the water level must be at a predetermined high water level (for example, the water level between the medium water level M and the high water level H, or the high water level H). When it is detected and turned off, the operation of the circulation pump 5 is stopped (the trial operation mode continues).

When a preset predetermined time has elapsed, the timer stops the operation of the circulation pump 5, closes the automatic replenishment water valve 7 to stop the automatic replenishment of water, and releases the trial operation mode.

With the above configuration, even if it takes a long time to fill the water during operation in the trial operation mode and forgets to cancel the trial operation mode, the trial operation mode is automatically released after the elapse of a predetermined time. It is possible to prevent the occurrence of troubles such as continuing the operation even afterward, or overflowing the water supplied to the expansion tank 4.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

Even if it takes a long time to fill the water in the trial run mode in which the heating water circuit is filled with water and you forget to cancel the trial run mode, the trial run mode is automatically released after the specified time has elapsed, so the circulation pump It is possible to prevent the occurrence of troubles such as continuing the operation even after the water filling is completed, or overflow of the water that is automatically supplied.

[Brief description of drawings]

FIG. 1 is a flow chart showing the operation of the embodiment of the present invention,
FIG. 2 is a schematic configuration diagram of a heating water circuit to which the present invention is applied, and FIG. 3 is a flowchart showing the operation of a conventional hot water heater. 1 ... Water heater, 3 ... Indoor radiator, 4 ... Expansion tank, 5 ... Circulation pump, 6 ... Water level detection switch, 7 ...
… Automatic refill water valve.

Claims (1)

[Claims] 1. A timer is provided, which starts in a trial operation mode of a heating water circuit by turning on a trial operation switch, and turns off a circulation pump, an automatic replenishing water valve and the like after a predetermined time to release the trial operation mode. Characteristic hot water heater.