JP4768681B2 - Hot water use system - Google Patents

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 an outlet water temperature sensor 85b, and the incoming water temperature sensor 85a and the outgoing water temperature sensor 85b are electrically connected to the control unit 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 is constructed by turning on the error display lamp 81 that the hot water pipe is reversely connected. Inform the person. 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 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 connects the incoming hot water pipe to the incoming water pipe connection, and the water temperature in the incoming water pipe connecting the incoming water pipe connection and the heat exchanger during execution of the hot water circulation operation. When the return side hot water pipe is lower than a reference temperature set in advance as the water temperature in the inlet pipe in the normal connection state where the return side hot water pipe is connected to the outlet side pipe connection part, the control is determined to be the reverse connection state. Comprising a configuration, and determining whether or not the reverse connection state is established by comparing a water temperature in the water inlet pipe line with the reference temperature in a state where the circulation fan is operated, wherein the circulation fan When it is determined that the water temperature in the water inlet pipe is lower than the reference temperature and the reverse connection state at a time when a predetermined time has elapsed since the operation is performed, the operation of the hot water terminal is stopped. It is characterized by A.
According to the above technical means, the water temperature in the water inlet pipe connecting the pipe connection part on the water inlet side of the hot water terminal and the heat exchanger, and the reference preset as the water temperature in the water inlet pipe in the positive connection state. comparing the temperature, Ru stops the operation of the hot water terminal temperature of the water inlet conduit is determined to be a reverse connection state is lower than the reference temperature.

That is, when the hot water circulation operation is executed in the reverse connection state, the water inlet pipe connecting the water inlet side pipe connection part of the hot water terminal and the heat exchanger has the heat after being radiated in the heat exchanger. Since the warm water flows in, the water temperature in the water inlet pipe is lower than when the warm water circulation operation is executed in the positive connection state. Therefore, the water temperature in the inlet pipe in the normal connection state is set in advance as a reference temperature, and if the water temperature in the inlet pipe is lower than the reference temperature, it is determined that the reverse connection state is established.
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.

In this case, the circulating fan of the hot water terminal is operated to increase the heat radiation from the heat exchanger, and when the hot water piping is reversely connected, the water temperature in the heat exchanger that flows out to the incoming water side is reduced. A determination is made as to whether or not the reverse connection state is obtained with the state sufficiently lowered. That is, it is determined whether or not the reverse connection state is established in a state in which the difference between the water temperature in the water inlet pipe and the reference temperature is noticeable. As a result, erroneous determination of reverse connection of hot water piping is reduced.

The technical means of the invention according to claim 2 is:
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 hot water terminal has a circulation fan that sends the heat released from the heat exchanger out of the machine as warm air,
The connection determining means connects the incoming hot water pipe to the incoming water pipe connection, and the water temperature in the incoming water pipe connecting the incoming water pipe connection and the heat exchanger during execution of the hot water circulation operation. When the return side hot water pipe is lower than a reference temperature set in advance as the water temperature in the inlet pipe in the normal connection state where the return side hot water pipe is connected to the outlet side pipe connection part, the control is determined to be the reverse connection state. Comprising a configuration, and determining whether or not the reverse connection state by comparing the reference temperature and the water temperature in the water inlet pipe in a state where the circulation fan is operated,
Rising temperature determination means for determining the amount of change in the water temperature in the inlet pipe from when the water temperature in the inlet pipe starts to rise until the circulation fan is operated,
The connection determining means sets the reference temperature to a value proportional to the magnitude of the water temperature change amount, and determines whether or not the reverse connection state exists.
The temperature of the hot water flowing into the water intake pipe line shows a relatively gradual change because the longer the length of the hot water pipe connecting the heat source machine and the hot water terminal, the greater the amount of heat released from the hot water pipe. . That is, a difference occurs in the water temperature in the inlet pipe depending on the length of the hot water pipe.

  However, in this case, a value that is proportional to the amount of change in the water temperature in the inlet pipe from when the water temperature in the inlet pipe starts to rise until the circulation fan is activated is set as the reference temperature. Since the reverse connection of the hot water pipe is determined by comparing the water temperature in the water intake pipe and the water temperature in the water inlet pipe, the erroneous determination of the reverse connection caused by the difference in the length of the hot water pipe 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, the reference | standard set beforehand as the water temperature in the water intake pipe line which connects the pipe connection part of the water supply side of a warm water terminal and a heat exchanger, and the water temperature in the said water intake pipe line in a normal connection state By determining the reverse connection of the hot water pipe from the comparison with the temperature, a water temperature sensor different from the above-mentioned water inlet pipe is provided in the water outlet pipe connecting the water outlet side pipe connection part of the hot water terminal and the heat exchanger. Since it is not necessary, it is possible to prevent the overall structure of the hot water utilization system from becoming complicated.

In addition , by comparing the water temperature in the inlet pipe with the reference temperature with the water temperature in the heat exchanger sufficiently lowered, the erroneous determination of the reverse connection of the hot water pipe is reduced. Accuracy is improved.

In the invention according to claim 2 , by setting the reference temperature according to the length of the hot water pipe, the erroneous determination of the reverse connection of the hot water pipe caused by the difference in the length of the hot water pipe is reduced. The accuracy is further 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. After supplying heat to the bathroom air conditioner 3 via the outgoing pipe L1, and dissipating heat in the heat exchanger 32 of the bathroom air conditioner 3, the hot water circulation operation is performed again from the return pipe L2 to the heat source machine 2. 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 ( The connection determination circuit C31 that executes the control operation shown in the operation flowchart of FIG. 2 and a temperature gradient (hereinafter referred to as “rising temperature gradient”) from when the detected temperature T starts to rise until it reaches the ventilation start temperature Tm. ) A pipe length determination circuit C32 for calculating Δdn is incorporated.

The pipe length determination circuit C32 stores a plurality of reference temperatures Sn for determining whether or not the detected temperature T indicates a positive connection state.
This reference temperature Sn is a value corresponding to the detected temperature T after a predetermined time (for example, 20 seconds) has elapsed since reaching the ventilation start temperature Tm in the positive connection state, and the tapping temperature (here, 80 ° C.).

Further, the reference temperature Sn is selected to be lower as the length of the outgoing pipe L1 and the return pipe L2 is longer.
Specifically, as shown in the graph of FIG. 3, when the outgoing pipe L1 and the return pipe L2 are long (for example, 15 m), the water temperature in the water inlet pipe 32a after starting to rise is the outgoing pipe L1. Since the amount of heat radiation from the forward piping L1 and the return piping L2 is larger than when the return piping L2 is short (for example, 3 m), the change is relatively gradual. Therefore, when the rising temperature gradient Δdn calculated by the pipe length determination circuit C32 is large (for example, Δd1), the reference temperature Sn (S1) larger than that when the rising temperature gradient Δdn is small is not shown. It is selected from the data table of the reference temperature Sn.

Note that A and C in FIG. 3 are graphs showing a change in temperature indicating a normal connection state, and B and D are graphs showing a change in the detected temperature T during reverse connection. Further, rising up to the "connection determining circuit C31" is corresponding to the "connection determination unit" as described above onset bright specific matters, the "detected temperature T reaches the blower start temperature Tm from the start of rising calculating a temperature gradient Δdn "function of the pipe length judging circuit C32 corresponds to the" rising temperature determination means "as described above onset bright particular matters.

[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 determines that the water temperature in the incoming water pipe 32a, that is, the detected temperature T of the incoming water temperature sensor 35 is the blowing start temperature Tm (here, 40 ° C. ) Is determined (ST4).
If the detected temperature T does not reach the ventilation start temperature Tm in step ST4, it is determined whether or not a hot water signal is input from the heat source side control unit C2, and the heat source machine 2 is operating normally. This is confirmed (ST5).

  In step ST4, when the detected temperature T reaches the air blowing start temperature Tm, the pipe length determination circuit C32 calculates the above-described rising temperature gradient Δdn to select the reference temperature Sn, and the fan motor 36. To start the heating operation for circulating and supplying hot air into the bathroom (ST6-7).

At the same time as the fan motor 36 is activated, measurement of the elapsed time from the operation start time, that is, the air blowing start time, is started. When the elapsed time reaches a predetermined time (here, 20 seconds), the detected temperature (hereinafter referred to as “measured temperature”) Tn of the incoming water temperature sensor 35 when the predetermined time has elapsed is equal to or higher than the reference temperature Sn. (ST8 to ST9).
In step ST9, if the detected temperature Tn of the incoming water temperature sensor 35 is equal to or higher than the reference temperature Sn when the predetermined time has elapsed, the heating operation is performed until the heating switch P4 is turned off (ST10).

  That is, in the state where the circulation fan 33 is rotated and the warm air is circulated and supplied into the bathroom, if the detected temperature Tn of the incoming water temperature sensor 35 at the time when a predetermined time has elapsed is equal to or higher than the reference temperature Sn, the heat source device 2 Since it can be assumed that the high-temperature hot water sent to the outgoing pipe L1 is in a positive connection state in which it flows into the incoming water pipe 32a as it is from the incoming water side connection part 301, the heating operation is continued.

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 (ST11-12).
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, when the detected temperature Tn of the incoming water temperature sensor 35 is lower than the reference temperature Sn (see graphs B and D in FIG. 3) at the time when a predetermined time has elapsed in step ST9, the heat source device 2 sends it to the outgoing pipe L1. It is assumed that the hot water thus produced is in a reverse connection state in which heat is radiated from the water outlet side connection portion 302 through the water outlet pipe 32b and radiated in the heat radiating pipe 320 and then flows into the water inlet pipe 32a. 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 ST12 is executed, and the heating operation is stopped (ST13, ST11-12).

  Therefore, if a trial run is performed after installing the bathroom air conditioner 3, the installer is informed that the outgoing pipe L1 is in the reverse connection state connected to the water outlet side connection portion 302, and the heating operation is stopped. The

In step ST9, “determining whether or not the detected temperature Tn of the incoming water temperature sensor 35 when the predetermined time has elapsed from the start of blowing is equal to or higher than the reference temperature Sn, and if the detected temperature Tn is lower than the reference temperature Sn” is determined. function of the reverse connection is determined that the state is a "terminal-side control unit C2 corresponds to the" connection determination unit "as described above onset bright particular matters.

  In addition, during the execution of the control operations in steps ST3 to ST5, a malfunction of the hot water source 2 such as the fire extinguishing of the gas burner 21 or the abnormal operation of the circulation pump 24 occurs, and no hot water signal is 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. And the heating stop operation | movement of said step ST11 and ST12 is performed (ST14, ST11-12).

  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.

  As described above, the temperature Tn detected by the incoming water temperature sensor 35 is less than the reference temperature Sn when a predetermined time has elapsed since the start of water flow into the heat exchanger 32 of the bathroom air conditioner 3 and the operation of the circulation fan 33. In this case, that is, when hot water is supplied from the water outlet side to the water inlet side of the heat exchanger 32, and the water temperature sensor 35 detects the water temperature after radiating heat in the heat exchanger 32, the reverse connection state Therefore, 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 amount of heat released from the heat exchanger 32, and the detected temperature Tn of the incoming water temperature sensor when a predetermined time elapses when the forward pipe L1 and the return pipe L2 are reversely connected. Since the reverse connection is determined in a state in which the difference from the reference temperature Sn is conspicuous, erroneous determination of the reverse connection is reduced. This improves the reverse connection determination accuracy.

  Further, a reference temperature Sn corresponding to the length of the outgoing pipe L1 and the return pipe L2 is set from the rising temperature gradient Δdn, and the reverse connection is determined from a comparison between the reference temperature Sn and the detected temperature Tn. Thus, erroneous determination of reverse connection caused by the difference in length between the forward pipe L1 and the return pipe L2 is reduced. Thereby, reverse connection determination accuracy further improves.

[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.

  Furthermore, in the above embodiment, the detected temperature Tn of the incoming water temperature sensor 35 at the time when the incoming water temperature to the heat exchanger 32 is assumed to be rising (when 20 seconds have passed since the start of air blowing) Although the reference temperature Sn is compared, the detected temperature Tn of the incoming water temperature sensor 35 at the time when the incoming water temperature to the heat exchanger 32 is assumed to be stable (for example, when 150 seconds have elapsed from the start of air blowing) The reference temperature Sn may be compared.

  Moreover, although the hot water terminal in the said embodiment illustrated 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, It may be a fan heater or panel heater for indoor 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 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 connects the incoming hot water pipe to the incoming water pipe connection, and the water temperature in the incoming water pipe connecting the incoming water pipe connection and the heat exchanger during execution of the hot water circulation operation. When the return side hot water pipe is lower than a reference temperature set in advance as the water temperature in the inlet pipe in the normal connection state where the return side hot water pipe is connected to the outlet side pipe connection part, the control is determined to be the reverse connection state. Comprising a configuration, and determining whether or not the reverse connection state is established by comparing a water temperature in the water inlet pipe line with the reference temperature in a state where the circulation fan is operated, wherein the circulation fan When it is determined that the water temperature in the water inlet pipe is lower than the reference temperature and the reverse connection state at a time when a predetermined time has elapsed since the operation is performed, the operation of the hot water terminal is stopped. Hot water characterized by Use system. 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 hot water terminal has a circulation fan that sends out the heat released from the heat exchanger as warm air to the outside of the machine,
The connection determining means connects the incoming hot water pipe to the incoming water pipe connection, and the water temperature in the incoming water pipe connecting the incoming water pipe connection and the heat exchanger during execution of the hot water circulation operation. When the return side hot water pipe is lower than a reference temperature set in advance as the water temperature in the inlet pipe in the normal connection state where the return side hot water pipe is connected to the outlet side pipe connection part, the control is determined to be the reverse connection state. Comprising a configuration, and determining whether or not the reverse connection state by comparing the reference temperature and the water temperature in the water inlet pipe in a state where the circulation fan is operated ,
Rising temperature determination means for determining the amount of change in the water temperature in the inlet pipe from when the water temperature in the inlet pipe starts to rise until the circulation fan is operated,
The connection determination means sets the reference temperature to a value proportional to the magnitude of the water temperature change amount, and determines whether or not the reverse connection state is established .

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