JP2009019844A - Hot water utilizing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the entire structure of a hot water terminal unit 3 from being complicated in a hot water utilizing system 1 for performing a hot water circulation operation for delivering and radiating hot water heated and generated by a heat source machine 2 from delivery side hot water piping L1 to a heat exchanger 32 of the hot water terminal unit 3, and then returning the hot water to the heat source machine 2 via return side hot water piping L2, wherein the system 1 is equipped with a connection determining means C31 capable of determining whether or not the delivery side hot water piping L1 is connected to a piping connection part 302 on a water outflow side of the hot water terminal unit 3 and the return side hot water piping L2 is connected to a piping connection part 301 on the water inflow side, which is a reverse connection state. <P>SOLUTION: When water flow to the heat exchanger 32 is temporarily stopped during execution of the hot water circulation operation and water flow is restarted after a passage of a predetermined period of time, if the water temperature of a water inflow conduit 32a connecting the water inflow side piping connection part 301 to the heat exchanger 32 is lowered to a reference change amount to which the water temperature is preset or less, the connection determining means determines that the piping connection state is in a reverse connection state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention detects a hot water utilization system that performs heating, drying, etc. using the heat of hot water, and in particular, detects reverse connection of a hot water pipe between a heat source device that generates hot water and a hot water terminal that discharges the heat of the hot water. It relates to a possible hot water utilization system.

  Hot water heated and generated by a heat source device is circulated and supplied to hot water terminals such as bathroom air conditioners and clothes dryers, and hot water is used to heat indoors and dry clothes using the heat of the hot water released from the hot water terminals. In the utilization system, in consideration of heat radiation efficiency, the water flow direction in the heat exchanger of the hot water terminal is generally set to one direction.

  Therefore, when the forward and return hot water pipes extending from the heat source unit are mistakenly connected reversely to the water inlet side and water outlet side of the pipe connection part of the hot water terminal, the hot water is reversed in the heat exchanger. Since it flows in the direction, the heat dissipation efficiency decreases.

  Therefore, in order to avoid this decrease in heat dissipation efficiency, two water temperature sensors for detecting the incoming and outgoing temperatures of the heat exchanger are provided in the hot water terminal, and the hot water piping is based on the difference in height between the incoming and outgoing temperatures. Some of them determine reverse connection.

  FIG. 4 is a schematic configuration diagram of a conventional hot water utilization system 6 that determines reverse connection based on the height difference, and releases the heat of hot water to the forward piping L1 and the return piping L2 of the hot water piping extending from the heat source unit 7. Thus, a hot water terminal 8 for heating the room is connected.

  The heat source unit 7 collects the heat of combustion of a gas burner (not shown) to generate hot water, and sends the hot water generated in the heat exchanger 72 to the outgoing pipe L1 between the hot water terminal 8 and the heat source 72. And a circulation pump 74 for circulation.

  On the other hand, the hot water terminal 8 includes a heat exchanger 82 that releases the heat of the hot water circulated and supplied from the heat source device 7 and a circulation fan 83 that sends out the heat released from the surface of the heat exchanger 82 to the room. Yes.

  In addition, in the casing 80 of the hot water terminal 8, a water inlet pipe connecting portion 801 connected to the heat exchanger 82 through the water inlet pipe 82a and a water outlet pipe connecting portion 802 connected to the heat exchanger 82 via the water outlet pipe 82b. And the incoming pipe L1 is connected to the water inlet pipe connecting portion 801, and the return pipe L2 is connected to the outlet pipe connecting portion 802.

  Furthermore, an incoming water temperature sensor 85a is attached to the incoming water pipe line 82a that connects the incoming water pipe connecting part 801 and the heat exchanger 82, and the outgoing water pipe line 82b that connects the outgoing water pipe connecting part 802 and the heat exchanger 82 is provided. Is provided with a water temperature sensor 85b, and the water temperature sensor 85a and the water temperature sensor 85b are electrically connected to the controller C8 of the hot water terminal 8.

The controller C8 of the hot water terminal 8 displays an error display lamp 81 provided in the casing 80 when the detected temperature of the incoming water temperature sensor 85a is lower than the detected temperature of the outgoing water temperature sensor 85b when the heating operation is executed. A connection determination circuit (not shown) for lighting is incorporated.
In this case, when connecting the heat source device 7 and the hot water terminal 8, the forward piping L1 which is the hot water piping on the outlet side of the heat source device 7 is erroneously connected to the outlet pipe connection portion 802 of the hot water terminal 8, and the heat source If heating operation is performed in a reverse connection state in which the return pipe L2 which is the hot water pipe on the return side to the machine 7 is connected to the inlet pipe connection portion 801 of the hot water terminal 8, hot hot water supplied from the heat source machine 7 is used. Flows into the outlet pipe 82b, and the low-temperature hot water after the heat is radiated by the heat exchanger 82 flows into the inlet pipe 82a.

As a result, the detected temperature of the incoming water temperature sensor 85a becomes lower than the detected temperature of the outgoing water temperature sensor 85b, and the connection determination circuit that has detected this detects that the hot water pipe is reversely connected by turning on the error display lamp 81. Notify the installer. As a result, it is possible to avoid the use in a state where the heat dissipation capability is lowered.
JP-A-4-268123

  However, in the above-mentioned conventional one, since it is necessary to provide water temperature sensors for detecting reverse connection at two locations of the water inlet pipe 82a and the water outlet pipe 82b, there is a problem that the structure of the entire hot water terminal is complicated. there were.

The present invention has been made in view of such points,
`` Hot water that performs hot water circulation operation that heats the hot water generated by the heat source machine from the outgoing hot water pipe to the heat exchanger of the hot water terminal and dissipates it, and then returns to the heat source machine via the return hot water pipe A hot water terminal connected to a water outlet pipe connection of a hot water terminal connected to the heat exchanger, and a return hot water pipe connected to the heat exchanger. In the `` warm water use system equipped with a connection determination means capable of determining whether it is in the reverse connection state connected to the pipe connection part on the water inlet side '', it is possible to prevent the structure of the entire warm water terminal from becoming complicated. Let it be an issue.

The technical means of the invention according to claim 1 for solving the above-mentioned problem is as follows:
“The connection determination unit temporarily stops water flow to the heat exchanger during execution of the hot water circulation operation, and resumes water flow after a predetermined time has elapsed. It is determined that the reverse connection state is established when the water temperature in the inlet pipe connecting the vessel is lowered by a predetermined reference change amount or more.
According to the above technical means, when the hot water circulation operation is being executed, when the water flow to the heat exchanger of the hot water terminal is temporarily stopped and the water flow to the heat exchanger is started again, When the water temperature in the water inlet pipe connecting the pipe connection part on the side and the heat exchanger is lowered by a predetermined reference change amount or more, it is determined that the reverse connection state is established.

  That is, when the forward hot water pipe is connected to the incoming water pipe connection of the heat exchanger and the return hot water pipe is connected to the outgoing water pipe connection of the heat exchanger, If the water flow to the heat exchanger of the hot water terminal is temporarily stopped during the operation and the water flow is started again after a predetermined time has passed, the hot water after being radiated and cooled for a predetermined time in the heat exchanger Since it flows to the outlet side of the heat exchanger, it does not lower the water temperature in the inlet pipe.

  On the other hand, in the reverse connection state, if the water flow is started after the lapse of the predetermined time, the hot water cooled in the heat exchanger flows to the water intake side of the heat exchanger. Reduce.

Therefore, after the water flow to the heat exchanger of the hot water terminal is stopped for a predetermined time during the hot water circulation operation, the water flow is started again, and the water temperature in the upper entry water pipeline at that time is a preset reference change If it falls to more than the amount, it is determined that the reverse connection state.
Therefore, it is not necessary to provide a water temperature sensor different from the above-mentioned water inlet pipe in the water outlet pipe connecting the pipe connection part on the outlet side of the hot water terminal and the heat exchanger.

The technical means of the invention according to claim 2 is:
In claim 1,
“The hot water terminal has a circulation fan that sends out the heat released from the heat exchanger to the outside of the machine,
The connection determining means is configured to change the reference temperature of the water temperature in the water inlet pipe when water circulation is resumed at least in a state where the circulation fan is operated until the predetermined time has elapsed since the water flow was stopped. It is characterized by determining whether or not the amount has decreased by an amount or more.
In this, at least the circulation fan of the hot water terminal is operated until the predetermined time has elapsed after stopping the water flow to increase the heat radiation amount from the heat exchanger, and the hot water pipe is reversely connected. In this case, it is determined whether or not the reverse connection state is established in a state where the water temperature in the heat exchanger flowing out to the water inlet side is sufficiently lowered. That is, it is determined whether or not the reverse connection state is established in a state where the difference between the amount of decrease in the water temperature in the incoming water pipe and the reference change amount is noticeable when the hot water pipe is reverse connection. As a result, erroneous determination of reverse connection of hot water piping is reduced.

Since the present invention has the above configuration, the present invention has the following specific effects.
In the invention which concerns on Claim 1, by determining the reverse connection of a hot water piping from the fall amount of the water temperature in the water intake pipe line which connects the piping connection part and the heat exchanger of the incoming water side of a warm water terminal, Since it is not necessary to provide a water temperature sensor different from the above-mentioned water inlet pipe in the water outlet pipe connecting the water outlet side pipe connection section and the heat exchanger, it is possible to prevent the entire structure of the hot water utilization system from becoming complicated.

  In the invention which concerns on Claim 2, the misjudgment of the reverse connection of a hot water piping is determined by determining the reverse connection of a hot water piping from the fall | decrease amount of the water temperature in the water intake pipe in the state which increased the heat dissipation from a heat exchanger. Therefore, the reverse connection determination accuracy is improved.

Next, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic configuration diagram of a hot water utilization system 1 according to an embodiment of the present invention, and FIG. 2 is an operation flowchart showing a connection determination operation for hot water piping of the hot water utilization system 1. Details of each part will be described below.

As shown in FIG. 1, the warm water utilization system 1 includes a heating source 2 for heating and generating hot water, and a bathroom air conditioner 3 for releasing and heating the warm water to perform heating and drying. The hot water generated in the heat exchanger 22 of the heat source unit 2 is connected by a pipe (hereinafter referred to as “outward pipe”) L1 and a return-side hot water pipe (hereinafter referred to as “return pipe”) L2. Supplying to the bathroom air conditioner 3 via the outgoing pipe L1, radiating heat in the heat exchanger 32 of the bathroom air conditioner 3, and then performing a hot water circulation operation returning to the heat source machine 2 from the return pipe L2 again. is there. And by this warm water circulation operation, heat is radiated from the heat exchanger 32 of the bathroom air conditioner 3, and heating or drying in the bathroom is performed.
In addition, a controller 4 that instructs the operation of the heat source device 2 and the bathroom air conditioner 3 is electrically connected to the heat source device 2.

[Heat source machine 2]
The heat source unit 2 heats and generates hot water by the combustion heat of the fuel gas, and in the casing 20 there is a gas burner 21 for burning the fuel gas supplied from a gas pipe (not shown), and the combustion heat of the fuel gas. The heat exchanger 22 for recovering the gas, the gas amount adjusting valve 23 for adjusting the supply amount of the fuel gas supplied to the gas burner 21, and the hot water generated in the heat exchanger 22 is sent to the outgoing pipe L1 side to condition the bathroom air A circulation pump 24 circulated with the machine 3 and a control unit (hereinafter referred to as “heat source side control unit”) C2 for controlling the operation of the heat source machine 2 as a whole are accommodated.

Then, the outgoing pipe L1 is connected to the hot water outlet side of the heat exchanger 22 via the circulation pump 24, and the return pipe L2 is connected to the hot water inlet side.
The heat source side control unit C2 is electrically connected with a gas amount adjusting valve 23, a circulation pump 24, a terminal side control unit C3 to be described later, and a remote control side control unit C4 to be described later, and the terminal side control unit C3. When the hot water instruction signal output from the hot water is received, the circulating pump 24 is operated, the gas burner 21 is ignited by an ignition device (not shown), and the temperature detected by a hot water temperature sensor (not shown) is set to a preset hot water temperature (for example, 80 ° C. The hot water control circuit C20 for adjusting the opening of the gas amount adjusting valve 23 is incorporated so that

  The hot water control circuit C20 is a terminal-side control unit which will be described later with a hot water signal indicating that the circulating pump 24 and the gas burner 21 are operating normally when the circulating pump 24 is operating and the gas burner 21 is burning. A function to output to C3 is provided.

[Bathroom air conditioner 3]
The bathroom air conditioner 3 is a hot water terminal that heats and heats the hot water circulated and supplied from the heat source device 2 into the bathroom as hot air, and releases heat of the hot water into the casing 30. Heat exchanger 32, circulation fan 33 that sends heat released from heat exchanger 32 into the bathroom, and control unit that controls the operation of the entire bathroom air conditioner 3 (hereinafter referred to as “terminal-side control unit”). C3 is housed.

  In the casing 30, an air passage 300 that connects the air inlet 30 a and the air outlet 30 b is formed. The heat exchanger 32 is incorporated on the upstream side of the air passage 300, and the circulation fan 33 is installed on the downstream side. Is incorporated.

  The heat exchanger 32 has a heat radiating pipe 320 extending so as to meander between the side walls of the air passage 300 from the circulation fan 33 side to the air inlet 30a side, and the end of the heat radiating pipe 320 on the circulation fan 33 side. Is connected to a water inlet side pipe connecting portion (hereinafter referred to as “water inlet side connecting portion”) 301 provided on the outer surface of the casing 30 via a water inlet pipe 32a, while the end of the heat radiating pipe 320 on the inlet 30a side. The portion is connected to a water discharge side pipe connection portion (hereinafter referred to as a “water discharge side connection portion”) 302 provided on the outer surface of the casing 30.

  Therefore, in the normal connection state in which the forward pipe L1 is connected to the water inlet side connection portion 301 and the return pipe L2 is connected to the water outlet side connection portion 302, the high temperature supplied from the heat source device 2 into the heat radiating pipe 320 is high. The hot water flows through the circulation fan 33 side to the intake port 30a side.

  In addition, a heat valve 34 that can be opened and closed in accordance with an instruction from the terminal-side control unit C3 is incorporated in the water inlet pipe 32a. By opening the heat valve 34, the heat source machine 2 sends out the heat valve 34a. The heated water flows into the heat radiating pipe 320.

Further, an incoming water temperature sensor 35 for detecting the water temperature in the incoming water pipe 32a is attached to the incoming water pipe 32a.
The circulation fan 33 is a cross flow fan extending between the side walls of the air passage 300, and a fan motor 36 is connected to the axial end of the circulation fan 33.

  Therefore, if this fan motor 36 is driven, the air in the bathroom is taken into the air passage 300 from the air inlet 30a and warmed on the side of the air inlet 30a of the heat radiating pipe 320 that is in a low temperature region in the above-described positive connection state. After that, it is further heated on the side of the circulation fan 33 of the heat radiating pipe 320 that becomes a high temperature region, and is sent out from the blower opening 30b into the bathroom. As a result, the air sent into the ventilation path 200 is efficiently heated.

  On the other hand, the thermal control valve 34, the incoming water temperature sensor 35, the fan motor 36, and the heat source side control unit C2 are electrically connected to the terminal side control unit C3, and a heating instruction signal output from the controller 4 side. Is received, the heating valve 34 is opened, and the heating control circuit that activates the fan motor 36 when the detected temperature T of the incoming water temperature sensor 35 reaches a preset blowing start temperature Tm (for example, 40 ° C.). C30 is incorporated.

  Further, a reverse connection notification lamp P1 and a heat source unit error notification lamp P2 provided on the casing 30 are electrically connected to the terminal side control unit C3, and connection determination operation of the forward piping L1 and the return piping L2 ( A connection determination circuit C31 for executing the control operation shown in the operation flowchart of FIG. 2, a water temperature change detection circuit C32 for detecting a change amount (hereinafter referred to as “temperature gradient”) Δdn of the detected temperature T per unit time, and Is incorporated.

The connection determination circuit C31 stores in advance a reference change amount (for example, 3 deg) S for determining whether or not a later-described water temperature decrease amount ΔT is a value indicating reverse connection.
The “connection determination circuit C31” corresponds to the “connection determination means” as the invention specifying items of the first to third aspects.

[Controller 4]
As shown in FIG. 1, the controller 4 includes a power switch P3, a heating switch P4, an audio output unit P5, and a display unit P6, and waits for a hot water supply to the heat source side control unit C2 in response to an ON operation of the heating switch P4. A control unit (hereinafter referred to as “remote control unit control unit”) C4 that outputs a signal and outputs a heating instruction signal to the terminal side control unit C3 is provided.

[Actual connection determination]
Next, the connection determination operation by the connection determination circuit C31 of the terminal side control unit C3 will be described according to the operation flowchart of FIG.

When the power switch P3 of the controller 4 is turned on, the heating control circuit C30 is activated and waits for the heating instruction signal to be input from the remote control side control unit C4 of the controller 4 (ST1).
At this time, the heat source machine 2 receives the hot water standby signal output from the remote controller side control unit C4, activates the hot water control circuit C20 of the heat source side control unit C2, and outputs the hot water instruction signal from the terminal side control unit C3. It will be in the state of waiting for.

  When the heating switch P4 of the controller 4 is turned on and a heating instruction signal is input from the remote control side control unit C4 via the heat source side control unit C2, the heating control circuit C30 opens the thermal valve 34 and the heat source side A hot water discharge instruction signal is output to the controller C2 (ST2-3).

  Then, although not shown, the heat source side control unit C2 that has received this tapping instruction signal operates the circulation pump 24, ignites the gas burner 21, and starts supplying hot water to the outgoing pipe L1 side. Thereby, the hot water produced | generated in the heat exchanger 22 by the side of the heat source machine 2 is sent into the heat exchanger 32 by the side of the bathroom air conditioner 3 through the going piping L1.

  When the water flow to the heat exchanger 32 is started, the terminal side control unit C3 operates the fan motor 36 to start the heating operation for circulating and supplying hot air into the bathroom, and at the same time inside the water inlet line 32a. It is determined whether the water temperature, that is, the detected temperature T of the incoming water temperature sensor 35 has reached a predetermined temperature Tm (here, 40 ° C.) (ST4 to 5).

  If the detected temperature T does not reach the predetermined temperature Tm in step ST5, whether or not a hot water signal is input from the heat source side control unit C2 to the terminal side control unit C3, that is, the heat source unit 2 It is determined whether or not it is operating normally. And when the said hot water signal is input, the determination operation of the said step ST5 is performed again (ST6).

  If the detected temperature T reaches the predetermined temperature Tm in step ST5, the water temperature change detection circuit C32 determines whether the temperature gradient Δdn is 0, that is, the detected temperature T of the incoming water temperature sensor 35 is Monitoring is started as to whether or not the transition is at a constant value (ST7).

  When the temperature gradient Δdn becomes zero, the heat valve 34 is closed for a predetermined time (here, 10 seconds) while the rotation of the circulation fan 33 is maintained, and the heat of the hot water staying in the radiating pipe 320 is increased. Release (ST8-9).

  Thereafter, if the predetermined time elapses in step ST9, the temperature detected by the incoming water temperature sensor 35 at the time when the predetermined time elapses (hereinafter referred to as "water temperature before resuming water flow") T1 is stored and the thermal valve 34 is set. Open and restart the water flow into the heat radiating pipe 320 (ST10).

Then, the detected temperature T2 of the incoming water temperature sensor 35 (hereinafter referred to as “water temperature after resuming water flow”) T2 after elapse of a certain time (here, 5 seconds) after the thermal valve 34 is opened is before the above water flow is resumed. The value subtracted from the water temperature T1, that is, the water temperature decrease amount ΔT per unit time after resuming the water flow is calculated, and it is determined whether or not the water temperature decrease amount ΔT is smaller than the reference change amount S. (ST11-13).
In step ST13, when the water temperature decrease amount ΔT is smaller than the reference change amount S (for example, 2 deg), the heating operation is performed until the heating switch P4 is turned off (ST14).

  That is, if the water temperature decrease amount ΔT when resuming the water flow is small, a relatively high temperature hot water staying in the outgoing pipe L1 is in a positive connection state in which it flows into the inlet pipe 32a via the inlet side connection part 301. Since it can be assumed that there is, continue heating operation.

If the heating switch P4 is turned off, a hot water stop signal is output to the heat source side control unit C2, and the thermal valve 34 is closed to block water flow in the heat radiating pipe 320, and then the fan motor 36 is turned on. Stop and stop supplying hot air into the bathroom (ST15-16).
At this time, the hot water control circuit C20 of the heat source side control unit C2 that has received the hot water stop signal output from the terminal side control unit C3 extinguishes the gas burner 21 and stops the circulation pump 24.

  On the other hand, as shown in the graph of FIG. 3, when the water temperature decrease amount ΔT when the water flow is resumed in step ST13 is equal to or greater than the reference change amount S (for example, 8 deg), It is assumed that the hot water that has stayed and is cooled and has a relatively low temperature flows into the water inlet pipe 32b.

  Accordingly, the reverse connection notification lamp P1 of the bathroom air conditioner 3 is turned on, and the voice output unit P5 and the display unit P6 of the controller 4 informs that the hot water pipe is reversely connected by voice and display. The heating stop operation of ST16 is executed, and the heating operation is stopped (ST17, ST15 to 16).

That is, if a trial run is performed after installing the bathroom air conditioner 3, the contractor is informed that the outgoing pipe L1 is in the reverse connection state connected to the water discharge side connection portion 302, and the heating operation is stopped. The
In step ST13, it is determined whether or not the water temperature decrease amount ΔT when the water flow is resumed is smaller than the reference change amount S, and if the water temperature decrease amount ΔT is equal to or greater than the reference change amount S, The function unit of the terminal-side control unit C2 that determines that the pipe is in the reverse connection state corresponds to the “connection determination unit” as the invention specifying matters of the first and second claims.

  In addition, during the execution of the control operations in steps ST4 to ST6, the hot water source operation failure of the heat source machine 2 such as the fire extinguishing of the gas burner 21 and the abnormal operation of the circulation pump 24 occurs, and the hot water signal is not input from the heat source side control unit C2. If the heat source unit error notification lamp P2 of the bathroom air conditioner 3 is turned on, the sound output unit P5 and the display unit P6 of the controller 4 notify that the heat source unit 2 has a hot water discharge operation failure by voice and display. Then, the heating stop operation in steps ST15 and ST16 is executed (ST18, ST15 to 16).

  Therefore, when hot water is not supplied to the bathroom air conditioner 3 due to a malfunction of the hot water supply operation of the heat source unit 2, the heat source unit 2 is determined before determining whether the outgoing pipe L1 and the return pipe L2 are reversely connected. The hot water operation failure is notified to the installer, and the heating operation is stopped.

  In this way, the water flow into the heat exchanger 32 of the bathroom air conditioner 3 is temporarily stopped during the heating operation, and the water flow is started from the water temperature T1 before the water flow is resumed when the water is passed again after a predetermined time has passed. This is the case when the value ΔT obtained by subtracting the water temperature T2 after the restart is equal to or larger than the preset reference change amount S, that is, when the incoming water temperature sensor 35 detects the temperature of the hot water cooled in the heat exchanger 32. Since it is determined to be in the connected state, it is not necessary to provide a water temperature sensor for detecting the water temperature of the outlet water pipe 32b connected to the outlet side of the heat exchanger 32, separately from the incoming water temperature sensor 35. Therefore, the structure of the entire hot water utilization system 1 is not complicated.

  Further, the circulation fan 33 is rotated to increase the heat radiation amount from the heat exchanger 32, and the hot water in the heat exchanger 32 is sufficiently cooled, that is, the forward piping L1 and the return piping L2 are positively connected. Since it is determined whether or not the water temperature decrease amount ΔT is equal to or greater than the reference change amount S in a state where the difference in the water temperature decrease amount ΔT is noticeable between the case and the reverse connection, water flow is resumed. In this case, the possibility that the hot water in the heat exchanger 32 is erroneously determined to be the normal connection state is reduced despite the reverse connection state in which the hot water flows into the water inlet pipe 32a. This improves the reverse connection determination accuracy.

[Others]
In the above embodiment, the connection determination circuit C31 that executes the connection determination operation is incorporated in the terminal side control unit C3 of the bathroom air conditioner 3. However, the connection determination circuit C31 is incorporated in the heat source side control unit C2 of the heat source unit 2. Alternatively, it may be incorporated in the remote control side control unit C4 of the controller 4.

  Moreover, although the said controller 4 is electrically connected to the bathroom air conditioner 3 via the heat-source equipment 2, it may be directly connected to the bathroom air conditioner 3.

  Further, in the heating operation in the above-described embodiment, the fan motor 36 is operated at the same time as the water flow to the heat exchanger 32 is started, but the detected temperature T of the incoming water temperature sensor 35 is set to a preset temperature (for example, 40 After reaching (° C.), the fan motor 36 may be operated.

  In the above embodiment, the reverse connection is based on the difference between the detected temperature T1 of the incoming water temperature sensor 35 at the time when the water flow is resumed and the detected temperature T2 at the time when a certain time has elapsed after the water flow is resumed. However, the detection temperature T of the incoming water temperature sensor 35 when the temperature exceeds a predetermined temperature Tm and starts to change at a certain value, and the above detection when a certain time has elapsed after restarting the water flow. You may determine reverse connection based on the difference with temperature T2.

  On the other hand, whether or not the water temperature decrease amount ΔT after closing the thermal valve 34 once and opening the thermal valve 34 is smaller than the reference change amount S is determined by the detection temperature T of the incoming water temperature sensor 35 being constant. Although it is executed in a state where the value changes, it may be executed when the detected temperature T of the incoming water temperature sensor 35 is rising.

  Further, in the above embodiment, when the temperature gradient Δdn is 0, it is determined that the detected temperature T of the incoming water temperature sensor 35 is changing at a constant value, but the temperature gradient Δdn expects an error. If it is within the range (for example, −0.1 ≦ Δdn ≦ + 0.1), it may be determined that the detected temperature T is changing at a constant value.

Furthermore, the reference change amount S may be set within a range in which a difference between the water temperature change amount in the normal connection state and the water temperature change amount in the reverse connection state can be recognized, or may be set to zero.
Although the hot water terminal in the said embodiment demonstrated and demonstrated the bathroom air conditioner 3, if it is a thing of the structure which may cause the fall of heat dissipation efficiency by reversely connecting a hot water piping, indoor heating It may be a fan heater or panel heater for heating, a hot water mat for floor heating, a clothes dryer or the like.

The schematic block diagram of the hot water utilization system 1 which concerns on embodiment of this invention The operation | movement flowchart which shows the connection determination operation | movement of the hot water utilization system 1 which concerns on embodiment of this invention. The graph which shows the change of the detection temperature T of the incoming water temperature sensor 35 of the hot water utilization system 1 which concerns on embodiment of this invention. Schematic configuration diagram of a conventional hot water utilization system 6

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hot water utilization system 2 ... Heat source machine 3 ... Hot water terminal 301 ... Incoming side pipe connection part 302 ... Outlet side pipe connection part 32 ... Heat exchanger 32a ... · Inlet pipe C31 ··· Connection determining means L1 ··· Outward hot water piping L2 ··· Return hot water piping

Claims (2)

Use of hot water to circulate the hot water generated by the heat source equipment from the hot water pipe on the outgoing side to the heat exchanger of the hot water terminal, dissipate heat, and then return to the heat source equipment via the hot water pipe on the return side The hot water terminal is connected to the outlet connection of the hot water terminal connected to the heat exchanger, and the return hot water pipe is connected to the heat exchanger. In the hot water usage system equipped with a connection determination means capable of determining whether or not it is in the reverse connection state connected to the side pipe connection part,
The connection determination means temporarily stops water flow to the heat exchanger during execution of the hot water circulation operation, and resumes water flow after a predetermined time has elapsed. When the water temperature in the water intake pipe connecting the two drops below a reference change amount set in advance, the hot water utilization system is determined to be in the reverse connection state. In the hot water use system according to claim 1,
The hot water terminal has a circulation fan that sends out heat released from the heat exchanger to the outside of the machine,
The connection determining means is configured to change the reference temperature of the water temperature in the water inlet pipe when water circulation is resumed at least in a state where the circulation fan is operated until the predetermined time has elapsed since the water flow was stopped. A hot water utilization system, characterized by determining whether or not the amount has decreased.

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