JP2565102B2 - Freezing prevention device for forced air supply / exhaust water heater - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a freeze prevention device for a forced air supply / exhaust type water heater, and more specifically, in addition to a hot water supply heat exchange can body, a bath heating heat exchange can body is arranged relatively close to each other. The present invention relates to an antifreezing device for a forced air supply / exhaust type water heater, which is capable of performing hot water supply and bath heating by performing combustion in each heat exchange can body by forced air supply / exhaust.

[0002]

2. Description of the Related Art A water heater in which a hot water supply heat exchange can and a bath heating heat exchange can are arranged side by side in one case to perform hot water supply and bath heating has been provided. Has been done. In such a water heater, in many cases, the hot water supply heat exchange can and the bath heating heat exchange can are arranged in close proximity to each other due to space limitations. In this case, a hot water supply side anti-freezing operation switch that detects the temperature of the hot water supply heat exchanger in the space between the two heat exchange cans and switches on when the temperature drops to around 0 ° C., and a heat exchange for bath heating There is a bath-side antifreeze operation switch that is turned on when the temperature of the water heater is detected and drops to around 0 ° C. On the water heater side, the hot-water supply side antifreeze operation switch is turned on. The heating of the electric heater attached to the vessel is started, and when the bath side freeze prevention operation switch is turned on at the bath heating side, circulation by the bath circulation pump is started.

[0003]

However, in the above-mentioned conventional water heater, particularly in the forced air supply / exhaust type water heater, when the combustion operation is not performed, the air flow in the case may be poor. Then, when the electric heater is turned on by turning on the water heater side anti-freezing operation switch, the surroundings are appropriately heated by the influence of the electric heater, and the temperature of the bath side anti-freezing operation switch located relatively near rises. For this reason, the bath side antifreeze operation switch does not turn on, even though the bath side must also perform antifreeze operation,
There was a problem that the freeze prevention operation was not started.

Therefore, the present invention solves the above-mentioned drawbacks of the prior art, and ensures that the bath-side antifreezing operation is reliably performed when necessary without the bath-side antifreezing operation being adversely affected by the electric heater on the hot-water supply side. It is an object of the present invention to provide a freezing prevention device for a forced air supply / exhaust water heater that can surely prevent not only the freezing on the side but also the freezing on the bath side.

[0005]

In order to achieve the above-mentioned object, a freezing prevention device for a forced air supply / exhaust type water heater according to the present invention includes a heat exchange can body for hot water supply and a heat exchange can body for bath heating in a case. Combining them to perform combustion operation by forced air supply and exhaust,
The temperature of the hot water supply heat exchanger is detected in the space between the two heat exchange cans, and when the temperature drops to around 0 ° C, the hot water supply side antifreeze operation switch and the temperature of the bath heating heat exchanger are detected. A bath-side antifreeze operation switch that turns on when the temperature drops to around 0 ° C is installed.
The hot water supply side starts heating by the electric heater attached to a part of the hot water supply heat exchanger by turning on the hot water supply side antifreezing operation switch, and the bath heating side by the bath circulation pump by turning on the bath side antifreezing operation switch A freezing prevention device for a forced air supply / exhaust type water heater that starts circulation so as to prevent freezing. Regarding the bath side freezing prevention operation, the hot water supply heat exchange can body and the bath heating heat exchange can Con only the hot water supply side antifreezing operation switch when both of the body is not performing combustion even when turned on, which is configured to perform freezing prevention operation by driving the bath circulation pump
It is characterized by having a trolley .

[0006]

According to the features of the present invention described above, when neither the hot water supply heat exchange can body nor the bath heating heat exchange can body is burning, the bath side freeze prevention operation is performed. The operation is started not only by turning on the prevention operation switch, but also when the hot water supply side freeze prevention operation switch is turned on even if the bath side freeze prevention operation switch is not turned on. That is, when combustion is not performed in either the hot water supply heat exchange can body or the bath heating heat exchange can body, the same temperature condition is obtained in any heat exchange can body heat exchanger. Therefore, if the hot water supply side freeze operation switch is turned on, even if the bath side anti-freeze operation switch is not turned on, this causes the effect of the electric heater on the hot water supply side. Considering this, it is assumed that the heat exchanger on the bath side has actually dropped to around 0 ° C., and the antifreezing operation on the bath side is started. This can reliably prevent freezing of the heat exchanger and circulation pump on the bath side.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view showing an embodiment of the device of the present invention, FIG. 2 is a flow chart showing an example of antifreezing control on the hot water supply side, and FIGS. It is a flowchart showing.

In the case 1, a hot water supply heat exchange can body 10 and a bath heat exchange can body 20 are provided relatively close to each other in parallel, and a space S is formed between them. The hot water supply heat exchange canister 10 and the bath heat exchange canister 20 are connected to a common exhaust pipe 30. A cylinder 40 is connected to the case 1 so that air is supplied from the outside. Forced supply / exhaust is performed by the exhaust cylinder 30 and the supply cylinder 40. The heat exchange can body 10 for hot water supply and the heat exchange can body 20 for bath are provided with blower fans 11 and 21, respectively, at their lower portions, and combustion burners 12 and 22 are provided therein. In addition, above the combustion burners 12 and 22, there are a heat exchanger 13 for hot water supply and a heat exchanger for bath heating, respectively.
23 are provided.

Hot water heat exchanger of the hot water heat exchange can body 10
In 13, a part of the pipe projects from the can body 10 into the space S,
A hot water supply side anti-icing operation switch 14 (hereinafter referred to as a Q side F point switch) and an electric heater 15 are provided at the protruding portion. Also, in the bath heating heat exchanger 23 of the bath heating heat exchange canister 20, a part of its pipe projects from the can body 20 into the space S, and the bath side freeze prevention operation switch 24 (hereinafter referred to as F side) An F point switch) is provided. The Q-side F point switch 14 is a switch that is turned on when the temperature of the hot water supply heat exchanger 13 decreases to around 0 ° C. Similarly, the F-side F-point switch 24 is a switch that is turned on when the bath heating heat exchanger 23 is lowered to around 0 ° C. The electric heater 15 is a heater for preventing the heat exchanger 13 for hot water supply from freezing.

The bath heating heat exchanger 23 is connected to a bath 60 through a reheating circulation path 50. Reheating circuit 50
A bath circulation pump 51, a bath temperature sensor 52, and a water flow switch 53 are provided in the. An outside air temperature sensor 70 is provided in the lower corner of the case 1 to detect the ambient temperature. Reference numeral 80 denotes a controller, which inputs information from each sensor and a command from a remote controller (not shown) and outputs a predetermined operation command to each part of the water heater.

The Q-side F point switch 14 keeps the temperature of the hot water supply heat exchanger 13 at 0 when the hot water supply heat exchange can body 10 is not combusted.
When the temperature drops to around 0 ° C., the switch is turned on, whereby the electric heater 15 heats the hot water supply heat exchanger 13. On the other hand, F
The side F point switch 24 is switched on when the temperature of the bath heating heat exchanger 23 drops to around 0 ° C. when the bath heating heat exchange can body 20 is non-combusting, and the bath circulation pump 51 is driven by this. Start the bath water to heat the bath heat exchanger 23
Circulates. Further, in the present invention, when neither the hot water supply heat exchange can body 10 nor the bath heating heat exchange can body 20 is non-combusting, even if the F side F point switch 24 is in the OFF state, When the Q side F point switch 14 is turned on,
The bath circulation pump 51 is operated.

A specific control operation of the antifreezing operation will be described with reference to FIGS. First, the freezing prevention operation on the hot water supply side will be described with reference to FIG. 2. Now, when the non-combustion state of the combustion burner 12 of the hot water supply heat exchange can body 10 is detected by a flame detector (not shown) or the like (Yes in S1). ), When the Q side F point switch 14 is turned on (Yes in S2),
The controller 80 turns on the electric heater 15 (S5). Even if the Q side F-point switch 14 is turned off in S2, if the outside air temperature sensor 70 indicates 3 ° C. or lower (Yes in S3), whether the outside air temperature sensor 70 is −2 ° C. or lower. Although the subsequent conditions differ depending on whether or not (S4), the electrothermal heater 15 is turned on in any case (S5, S9). When the electric heater 15 is turned on, the hot water supply heat exchanger 13 is directly heated, and the freezing of the hot water supply heat exchanger 13 is prevented. When the Q side F point switch 14 is turned on and when the outside air temperature sensor 70
If the temperature is below -2 ° C, the electric heater 15 is switched on for 40 minutes (S6), then switched off (S7), and after waiting for 10 minutes (S8), the process returns to S1 again. If S4 is NO, the electric heater 15 is turned on (S9),
After 20 minutes (S10), the switch is turned off (S1
1) After waiting for 30 minutes (S12), the process returns to S1 again.

Next, the freezing prevention operation control on the bath side will be described with reference to FIGS. 3 to 5. First, in FIG. 3, the flame detector (not shown) on the water heater side and the bath side, etc. Either combustion burner 12, 22 on the Q side) or the bath side (F side)
If the Q side F-point switch 14 is turned on (YES in S2) when it is detected that the F-side F-point switch 24 is turned on (YES in S1), the F-side F point switch 24 is turned on,
The controller 80 turns on the bath circulation pump 51 regardless of whether it is turned off (S6). In S1, the water heater side (Q
Side) and the bath side (F side) cannot be said to be in a non-combustion state (No in S1), but the bath side (F side) is non-combustion (Yes in S3), F side F When the point switch 24 is turned on (Yes in S4), the controller 80 turns on the bath circulation pump 51. Even if the F side F point switch 24 is turned off in S4 (No in S4), the outside temperature sensor
If 70 is 3 ° C. or lower (YES in S5), the bath circulation pump 51 is turned on. When the circulation pump 51 is turned on, the circulation pump 51 is driven, and the water in the bathtub 60 is reheated and circulates through the circulation passage 50 to the bath heating heat exchanger 23, and the bath heating heat exchanger 23, the circulation passage 50, and the circulation. Prevent freezing in the pump 51 etc. After the circulation pump 51 is turned on (S6), a reheating circulation path
If the water flow switch 53 of 50 is turned on continuously for 30 seconds (S7
Yes), and the circulation pump 51 is turned off because the predetermined freeze prevention operation has been performed by this (S9). In S7, if the water flow switch 53 does not turn on continuously for 30 seconds even after 5 minutes have passed (YES in S8), it is determined that there is no water in the bathtub 60, and the bath circulation pump 51 is turned off (S10).

When the bath circulation pump 51 is turned off in S9, the process proceeds to the flow shown in FIG. That is, when the bath circulation pump 51 is turned off, if the Q side F point switch 14 is on (No in S11) or the F side F point switch 24 is on (No in S12), After waiting for 5 minutes (S16), the process returns to S1 in FIG. When the Q-side F-point switch 14 is off (Yes in S11) and the F-side F-point switch 24 is also off (Yes in S12), it is determined whether the bath temperature sensor 52 is 15 ° C or lower (S13). ), In the following case (S
If the temperature of the outside air temperature sensor 70 is -2 ° C. or lower, 5 is given according to the temperature of the outside air temperature sensor 70.
Give a waiting time of one minute (Yes in S14, Yes in S15, S16), and give a waiting time of 15 minutes when the temperature of the outside air temperature sensor 70 is 1 ° C or less (Yes in S14, No in S15, S18). If the temperature of the outside air temperature sensor 70 exceeds 1 ° C, a waiting time of 50 minutes is given (NO in S14, S1
7). Even if the bath temperature sensor 52 exceeds 15 ° C. in S13 (NO in S13), depending on the temperature of the outside air temperature sensor 70,
When the temperature of the outside air temperature sensor 70 is −2 ° C. or less, a waiting time of 5 minutes is given (Yes in S19, Yes in S20, S2
1) If the temperature of the outside air temperature sensor 70 is 1 ° C or less, 3
Give a waiting time of 0 minutes (Yes in S19, No in S20,
If the temperature of the outside air temperature sensor 70 exceeds 1 ° C., a waiting time of 90 minutes is given (NO in S19, S23).

When the bath circulation pump 51 is turned off in S10, that is, when the water circulation switch 53 is not turned on continuously for 30 seconds or more even after 5 minutes have passed even though the bath circulation pump 51 is turned on, When the bath circulation pump 51 is turned off, the process proceeds to the flow of FIG. And the Q side F point switch 14
Is on (No in S31) or F side F point switch
If 24 is turned on (NO in S32), the process returns to S1 of FIG. 3 with a waiting time of 30 minutes (S35). Q side F
When the point switch 14 is off (Yes in S31) and the F-side F point switch 24 is also off (Yes in S32), the temperature detected by the outside air temperature sensor 70 depends on the temperature of the outside air temperature sensor 70.
If the temperature is 2 ° C or less, a waiting time of 30 minutes is given (S33: Yes, S34: Yes, S35). When the temperature detected by the outside air temperature sensor 70 is 1 ° C. or less, the standby time is 60 minutes (S33).
Yes, S34, No, S36). In addition, the outside temperature sensor
When the detected temperature of 70 exceeds 1 ° C., the waiting time is 90 minutes (NO in S33, S37).

[0016]

According to the freeze prevention apparatus for a forced air supply / exhaust type water heater according to the first aspect of the present invention, the present invention has the above-described structure and operation, and the heat exchange can body for hot water supply and the heat exchange can body for bath heating. A controller configured to operate the bath circulation pump to perform antifreeze operation even when only the hot water supply side antifreeze operation switch is turned on when both are not burning
Since the anti-freezing operation on the bath side is not adversely affected by the electric heater on the hot water supply side, the anti-freezing operation on the bath side is reliably performed when necessary. Can also be done reliably.

[Brief description of drawings]

FIG. 1 is a cross-sectional configuration diagram showing an embodiment of the device of the present invention.

FIG. 2 is a flowchart showing an example of freeze prevention control on the hot water supply side.

FIG. 3 is a flowchart showing an example of freeze prevention control on the bath side.

FIG. 4 is a flowchart showing an example of freeze prevention control on the bath side.

FIG. 5 is a flowchart showing an example of freeze prevention control on the bath side.

[Explanation of symbols]

 1 Case 10 Heat exchange can body for hot water supply 13 Heat exchanger for hot water supply 14 Hot water supply side freeze prevention operation switch (Q side F point switch) 15 Electric heater 20 Heat exchange can body for bath heating 23 Heat exchanger for bath heating 24 Bath side Antifreeze operation switch (F side F point switch) 50 Reheating circulation circuit 51 Bath circulation pump 60 Bathtub 70 Outside air temperature sensor 80 Controller S space

Claims (1)

(57) [Claims] 1. A hot water supply heat exchange can body and a bath heating heat exchange can body are arranged side by side in a case to perform combustion operation by forced air supply / exhaust, and in the spaces between the both heat exchange can bodies, respectively. Detects the temperature of the heat exchanger for hot water supply and switches it on when it decreases to around 0 ° C. Detects the temperature of the anti-freezing operation switch on the hot water supply side and the heat exchanger for bath heating and switches it on when it decreases to around 0 ° C. A bath side freeze prevention operation switch is provided, and the hot water supply side starts heating by an electric heater attached to a part of the hot water supply heat exchanger when the hot water supply side freeze prevention operation switch is turned on, and the bath heating side freezes on the bath side. This is a freezing prevention device for a forced air supply / exhaust type water heater that prevents freezing by starting circulation by the bath circulation pump when the prevention operation switch is turned on. In addition, even when both the hot water supply heat exchange can body and the bath heating heat exchange can body are not burning, even if only the hot water supply side freeze prevention operation switch is turned on, the bath circulation pump is operated. An anti-icing device for a forced air supply / exhaust water heater, characterized in that a controller configured to perform anti-freezing operation is provided .