JP2013108651A - Floor heating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor heating system for easily detecting improper connection of refrigerant pipes in a cooling cycle operation without freezing a water heat exchanger in a floor heating unit.SOLUTION: In the cooling cycle operation of an outdoor unit 100, while a circulating pump 23 disposed in a hot water circuit in the floor heating unit 200 is in continuous operation, a plurality of electric valves EVA, EVB, EVC corresponding to a plurality of refrigerant pipe connections 7A, 7B, 7C, 8A, 8B, 8C, respectively, in the outdoor unit 100 are sequentially opened. On the basis of temperatures of indoor heat exchangers 4A, 4B detected by indoor heat exchanger temperature sensors 15A, 15B and a temperature of a liquid refrigerant detected by a temperature sensor 32 and flowing into the water heat exchanger 21, a refrigerant pipe connection determination part 18a determines the connection between the plurality of refrigerant pipe connections 7A, 7B, 7C, 8A, 8B, 8C and indoor heat exchangers 4A, 4B, and the water heat exchanger 21 through the refrigerant pipes.

Description

  The present invention relates to a floor heating system, and more particularly to a floor heating system including a floor heating unit.

  Conventionally, a multi-type air conditioner that includes a plurality of indoor units and an outdoor unit connected to the plurality of indoor units via a refrigerant pipe, and detects erroneous connection of refrigerant pipes connecting the indoor units to the outdoor unit. (For example, refer to JP-A-7-305879 (Patent Document 1)). In this multi-type air conditioner, the indoor unit is cooled one by one, and the temperature of the refrigerant path corresponding to the indoor unit to be cooled is detected to detect a refrigerant pipe misconnection. ing.

  By the way, in such a configuration of a multi-type air conditioner, in a floor heating system in which a floor heating unit is connected instead of an indoor unit, if an incorrect connection of refrigerant piping is detected during cooling cycle operation, Since the water heat exchanger may be frozen and damaged, there is a problem that an incorrect connection of the refrigerant pipe cannot be detected.

Japanese Patent Laid-Open No. 7-305879

  Then, the subject of this invention is providing the floor heating system which can detect the misconnection of refrigerant | coolant piping easily by air_conditioning | cooling cycle driving | operation, without freezing the water heat exchanger of a floor heating unit.

In order to solve the above problems, the floor heating system of the present invention is:
A floor heating unit;
A heat pump unit having a plurality of refrigerant pipe connections to which the floor heating unit is connected via refrigerant pipes;
Temperature detecting means for detecting a temperature of the water heat exchanger of the floor heating unit or a temperature corresponding to the temperature of the water heat exchanger;
In the cooling cycle operation of the heat pump unit, the circulation pump disposed in the hot water circuit of the floor heating unit is operated continuously or intermittently to correspond to the plurality of refrigerant pipe connection portions of the heat pump unit, respectively. Refrigerant pipe connection determination for determining connection between the plurality of refrigerant pipe connection portions and the refrigerant pipe based on the temperature of the water heat exchanger detected by the temperature detecting means by sequentially opening the plurality of motor-operated valves. And a section.

  According to the above configuration, in the floor heating system in which the floor heating unit is connected to the plurality of refrigerant pipe connection portions of the heat pump unit via the refrigerant pipe, the refrigerant pipe connection determination unit is configured to perform floor heating in the cooling cycle operation of the heat pump unit. Detected by temperature detection means by sequentially opening a plurality of motor-operated valves respectively corresponding to a plurality of refrigerant pipe connections of the heat pump unit in a state where the circulation pump disposed in the unit hot water circuit is continuously or intermittently operated. Based on the temperature of the water heat exchanger, the connection between the plurality of refrigerant pipe connection portions and the refrigerant pipe is determined. In other words, the liquid refrigerant flows into the water heat exchanger connected to the refrigerant pipe connection corresponding to the open motor-operated valve, and the temperature of the water heat exchanger decreases. It becomes possible to determine whether or not the correct water heat exchanger is connected to the corresponding refrigerant pipe connection.

  At the time of determination by the refrigerant pipe connection determination unit, heat is exchanged by the water circulating in the hot water circuit of the floor heating unit by continuously or intermittently operating the circulation pump disposed in the hot water circuit of the floor heating unit, and the liquid Freezing of the water heat exchanger into which the refrigerant flows can be prevented. In this way, it is possible to easily detect an incorrect connection of the refrigerant pipes in the cooling cycle operation without freezing the water heat exchanger of the floor heating unit.

Moreover, in the floor heating system of one embodiment,
The temperature detecting means is a temperature sensor that detects an inlet refrigerant temperature of the water heat exchanger.

  According to the said embodiment, the temperature fall of a water heat exchanger can be correctly caught with the temperature sensor which detects the refrigerant | coolant temperature of the inlet_port | entrance of a water heat exchanger.

Moreover, in the floor heating system of one embodiment,
The pressure sensor which detects the refrigerant | coolant pressure of the said water heat exchanger was provided.

  Here, the water heat exchanger is a water heat exchanger into which liquid refrigerant flows in the cooling cycle operation.

  According to the embodiment, the temperature drop of the water heat exchanger is accurately determined by converting the temperature corresponding to the temperature of the water heat exchanger based on the refrigerant pressure of the water heat exchanger detected by the pressure sensor. Can be caught.

Moreover, in the floor heating system of one embodiment,
The floor heating unit has a thermal valve disposed in the hot water circuit,
At the time of determination by the refrigerant pipe connection determination unit, a thermal valve control unit is provided for opening at least one of the thermal valve of the floor heating unit.

  According to the above embodiment, at the time of determination by the refrigerant pipe connection determination unit, the thermal valve controller circulates the hot water circuit by opening at least one of the thermal valves arranged in the hot water circuit of the floor heating unit. Heat is exchanged with the liquid refrigerant by the water heat exchanger, and the water heat exchanger into which the liquid refrigerant flows can be reliably prevented from freezing.

Moreover, in the floor heating system of one embodiment,
The temperature detection means is a water temperature sensor that detects the water temperature on the forward side of the floor heating unit.

  According to the embodiment, the temperature drop of the water heat exchanger is indirectly detected by converting the temperature corresponding to the temperature of the water heat exchanger based on the water temperature on the outgoing side of the floor heating unit detected by the water temperature sensor. Can be detected automatically.

Moreover, in the floor heating system of one embodiment,
When the temperature of the water heat exchanger detected by the temperature detection means is approximately 5 ° C. or less, the heat pump that reduces the cooling cycle operation capability of the heat pump unit below the current capability or stops the cooling cycle operation. A unit controller was provided.

  According to the above embodiment, when the temperature of the water heat exchanger detected by the temperature detection means is approximately 5 ° C. or less, the heat pump unit controller reduces the cooling cycle operation capability of the heat pump unit below the current capability. Alternatively, by stopping the cooling cycle operation, the water heat exchanger can be prevented from being damaged by freezing.

Moreover, in the floor heating system of one embodiment,
At least one indoor unit for air conditioning is connected to the plurality of refrigerant pipe connections of the heat pump unit,
In the determination by the refrigerant pipe connection determination unit, after opening the indoor fans of the indoor unit for a preset time before opening the plurality of motor-operated valves respectively corresponding to the plurality of refrigerant pipe connection parts of the heat pump unit. An indoor fan control unit for controlling the indoor fan is provided so as to stop.

  According to the above embodiment, in the determination by the refrigerant pipe connection determination unit, before opening the plurality of motorized valves corresponding to the plurality of refrigerant pipe connection parts of the heat pump unit, the indoor fan control unit controls the indoor fan, By stopping the indoor fan of the indoor unit after operating for a preset time, even if there is a liquid refrigerant pool in the indoor heat exchanger when starting the refrigerant pipe connection determination, the indoor fan can be operated The liquid refrigerant pool can be eliminated by heat exchange with room air, the temperature of the indoor heat exchanger can be made equal to the room temperature, and the liquid refrigerant pool can prevent the temperature of the indoor heat exchanger from being accurately detected.

Moreover, in the floor heating system of one embodiment,
The thermal valve control unit opens the thermal valve before cooling cycle operation of the heat pump unit at the time of determination by the refrigerant pipe connection determination unit,
The refrigerant pipe connection determination unit operates the circulation pump with the thermal valve opened, and starts a cooling cycle operation of the heat pump unit after a preset time has elapsed from the operation of the circulation pump.

  According to the above embodiment, at the time of determination by the refrigerant pipe connection determination unit, the thermal valve control unit opens the thermal valve before the cooling cycle operation of the heat pump unit, and the refrigerant pipe connection determination unit opens the thermal valve. Since the cooling pump operation of the heat pump unit is started after a preset time has elapsed from the operation of the circulation pump by operating the circulation pump in a state, it is delayed that the thermal valve is opened, for example, for 1-2 minutes from energization In the closed state, the cooling cycle operation of the heat pump unit can be prevented and the water heat exchanger can be reliably prevented from freezing.

  As is clear from the above, according to the floor heating system of the present invention, a floor heating system that can easily detect misconnection of refrigerant pipes in a cooling cycle operation without freezing the water heat exchanger of the floor heating unit is realized. can do.

FIG. 1 is a configuration diagram of a floor heating system according to an embodiment of the present invention. FIG. 2 is a timing chart at the time of determining refrigerant pipe connection in the floor heating system. FIG. 3 is a flowchart for explaining the refrigerant pipe connection determination operation of the control device of the floor heating system. FIG. 4 is a flowchart following FIG. FIG. 5 is a flowchart following FIG. FIG. 6 is a flowchart following FIG.

  Hereinafter, the floor heating system of this invention is demonstrated in detail by embodiment of illustration.

  FIG. 1 shows a configuration diagram of a floor heating system according to an embodiment of the present invention. As shown in FIG. 1, the floor heating system of this embodiment includes an indoor unit A having an indoor heat exchanger 4A and an indoor fan 5A, an indoor unit B having an indoor heat exchanger 4B and an indoor fan 5B, An outdoor unit 100 connected to the indoor units A and B via a refrigerant pipe, a floor heating unit 200 having a water heat exchanger 21 connected to the outdoor unit 100 via a refrigerant pipe, and a floor heating unit 200 Floor heating panels 300 and 400 are provided.

  In FIG. 1, 1 is a compressor, 2 is a four-way valve with one end connected to the discharge side of the compressor 1, 3 is an outdoor heat exchanger with one end connected to the other end of the four-way valve 2, EVA , EVB, EVC are motor-operated valves having one end connected to the other end of the outdoor heat exchanger 3, and 4A, 4B are indoor heat exchangers having one end connected to the other end of the motor-operated valves EVA, EVB, 6 Is an accumulator in which one end is connected to the other end of the indoor heat exchangers 4A and 4B via the four-way valve 2 and the other end is connected to the suction side of the compressor 1. Indoor fans 5A and 5B are arranged in the vicinity of the indoor heat exchangers 4A and 4B, respectively.

  A plurality of refrigerant pipe connections 7A and 7B are connected to the other ends of the electric valves EVA, EVB and EVC, and the indoor heat exchangers 4A and 4B are connected to the plurality of refrigerant pipe connections via communication pipes (refrigerant pipes). One end of each is connected. A plurality of refrigerant pipe connection portions 8A and 8B are connected to the other ends of the indoor heat exchangers 4A and 4B via communication pipes (refrigerant pipes).

  The compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the electric valves EVA, EVB, EVC, the indoor heat exchangers 4A, 4B, the water heat exchanger 21 of the floor heating unit 200, and the accumulator 6 constitute a refrigerant circuit. doing.

  A discharge pipe temperature sensor 11 is provided on the discharge side of the compressor 1. The outdoor heat exchanger 3 is provided with an outdoor heat exchanger temperature sensor 12 for detecting the outdoor heat exchanger temperature, and an outdoor temperature sensor 13 for detecting the outdoor temperature is provided in the vicinity of the outdoor heat exchanger 3. Further, a temperature sensor 14A is provided in the refrigerant pipe that connects the electric valve EVA and the refrigerant pipe connection portion 7A, a temperature sensor 14B is provided in the refrigerant pipe that connects the electric valve EVB and the refrigerant pipe connection portion 7B, and the electric valve EVC A temperature sensor 14C is provided in the refrigerant pipe connecting the refrigerant pipe connection portion 7C. Further, a temperature sensor 17A is provided in the refrigerant pipe connecting the four-way valve 2 and the refrigerant pipe connection portion 8A, and a temperature sensor 17B is provided in the refrigerant pipe connecting the four-way valve 2 and the refrigerant pipe connection portion 8B. A temperature sensor 17C is provided in the refrigerant pipe connecting the valve 2 and the refrigerant pipe connecting portion 8C.

  The indoor heat exchanger 4A is provided with an indoor heat exchanger temperature sensor 15A that detects the temperature of the indoor heat exchanger, and an indoor temperature sensor 16A that detects the indoor temperature is provided near the indoor heat exchanger 4A. The indoor heat exchanger 4B is provided with an indoor heat exchanger temperature sensor 15B that detects the temperature of the indoor heat exchanger, and an indoor temperature sensor 16B that detects the indoor temperature is provided near the indoor heat exchanger 4B.

  The floor heating unit 200 is connected to the outdoor unit 100 via a connection pipe (refrigerant pipe) on the primary side, and to the secondary side outlet of the water heat exchanger 21 at one end. An expansion tank 22 with a positive / negative pressure valve, a circulation pump 23 having one end connected to the other end of the expansion tank 22 with a positive / negative pressure valve, and a forward header 24 having an inlet connected to the other end of the circulation pump 23; The thermal valves V1 to V4, each having one end connected to the four outgoing pipe connection ports of the outgoing header 24, and the outlet side connected to the secondary return port of the water heat exchanger 21, are connected to the four return pipes. And a return header 25 provided with a mouth.

  Further, the pressure sensor 31 is disposed in the refrigerant pipe that connects the refrigerant pipe connection portion 7 </ b> C and one end of the water heat exchanger 21. Further, a temperature sensor 32 is provided in the vicinity of the refrigerant pipe and the water heat exchanger 21 that connects the refrigerant pipe connection portion 8 </ b> C and the other end of the water heat exchanger 21. Further, an outgoing water temperature sensor 33 for detecting the outgoing water temperature is provided in the outgoing pipe connecting the expansion tank 22 with the positive / negative pressure valve and the circulation pump 23, and the return header 25 and the secondary return port of the water heat exchanger 21 are connected. A return water temperature sensor 34 for detecting the return water temperature is provided in the return pipe.

  Furthermore, one end of the floor heating panel 300 is connected to the other end of the thermal valve V 1, and the other end of the floor heating panel 300 is connected to the return header 25. One end of the floor heating panel 400 is connected to the other end of the thermal valve V <b> 2, and the other end of the floor heating panel 400 is connected to the return header 25. In this embodiment, the two floor heating panels 300 and 400 are connected to the floor heating unit 200. However, the present invention is not limited to this, and the number of floor heating panels connected to the floor heating unit may be one or three or more.

  The outdoor unit 100 includes a control device 18 including a microcomputer and an input / output circuit. The control device 18 includes a refrigerant pipe connection determination unit 18a, an operation control unit 18b as an example of a heat pump unit control unit, an indoor fan control unit 18c, and a thermal valve control unit 18d. The indoor units A and B and the floor heating unit 200 include control units (not shown), and the control units of the indoor units A and B and the floor heating unit 200 communicate with the control device 18 of the outdoor unit 100 and a communication line. The floor heating system as a whole operates by communicating with each other via (not shown).

  According to the floor heating system having the above configuration, when the heating operation is performed by the indoor units A and B, the four-way valve 2 is switched to the position of the solid line and the operation of the compressor 1 is started. Then, the electric valves EVA and EVB are each opened to a predetermined opening degree. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is condensed into liquid refrigerant by exchanging heat with indoor air in the indoor heat exchangers 4A and 4B by operating the indoor fans 5A and 5B. Next, the liquid refrigerant from the indoor heat exchangers 4A and 4B is evaporated by heat exchange with outdoor air by operating an outdoor fan (not shown) in the outdoor heat exchanger 3 after being depressurized by the electric valves EVA and EVB. Thus, the refrigerant becomes a gas refrigerant and returns to the suction side of the compressor 1.

  In addition, when the floor heating panel 300, 400 performs the floor heating operation simultaneously with the heating operation in the indoor units A, B, the motor-operated valve EVC opens to a predetermined opening at the start of the operation, and the operation of the circulation pump 23 is started. Then, the thermal valves V1 and V2 are opened. Thereby, water circulates through the hot water circuit of the floor heating unit 200 and the floor heating panels 300 and 400. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is condensed by the heat exchange with the water flowing on the secondary side in the water heat exchanger 21 to become a liquid refrigerant. Next, the liquid refrigerant from the primary side of the water heat exchanger 21 is decompressed by the motor-operated valve EVC, and then evaporated by heat exchange with the outdoor air in the outdoor heat exchanger 3 to become a gas refrigerant. Return to the suction side.

  Here, only the floor heating operation may be performed by the floor heating panels 300 and 400 without performing the heating operation by the indoor units A and B.

  Next, in the floor heating system of this embodiment, the refrigerant pipe connection between the refrigerant pipe connection portions 7A, 7B, 8A, 8B of the outdoor unit 100 and the indoor units A, B, and the refrigerant pipe connection of the outdoor unit 100 The refrigerant | coolant piping connection determination operation which determines the connection of the part 7C, 8C and the floor heating unit 200 is demonstrated.

  FIG. 2 shows a timing chart at the time of determining the refrigerant pipe connection in the floor heating system. As shown in FIG. 2, the thermal valve controller 18d of the control device 18 (shown in FIG. 1) first opens the thermal valves V1 and V2 and starts the operation of the circulation pump 23 (FIG. 2 (E ), (F)). Next, after a predetermined time has elapsed, the refrigerant pipe connection determining unit 18a switches the four-way valve 2 to the dotted line position, starts the operation of the compressor 1, and starts the cooling cycle operation (FIG. 2 (A)). Further, the indoor fan 5A of the indoor unit A and the indoor fan 5B of the indoor unit B are operated for a predetermined time (FIGS. 2G and 2H). Then, after operating the indoor fans 5A and 5B for a predetermined time, the motor-operated valve EVA is opened, and the temperature of the indoor heat exchanger 4A is detected by detecting the temperature of the indoor heat exchanger 4A by the indoor heat exchanger temperature sensor 15A. It is determined whether or not it has decreased.

  Next, the electric valve EVA is closed, and the indoor fans 5A and 5B are operated again for a predetermined time (FIGS. 2 (G) and (H)). Then, after operating the indoor fans 5A and 5B for a predetermined time, the electric valve EVB is opened, and the temperature of the indoor heat exchanger 4B is detected by the indoor heat exchanger temperature sensor 15B. It is determined whether or not it has decreased.

  Next, the electric valve EVB is closed, and the indoor fans 5A and 5B are operated again for a predetermined time (FIGS. 2 (G) and (H)). Then, after operating the indoor fans 5A, 5B for a predetermined time, the electric valve EVC is opened, and the temperature of the water heat exchanger 21 is detected by detecting the temperature of the liquid refrigerant flowing into the water heat exchanger 21 by the temperature sensor 32. It is determined whether or not it has decreased.

  Finally, the electric valve EVC is closed, the compressor 1 is stopped, the cooling cycle operation is finished, the operation of the circulation pump 23 is stopped, and the thermal valves V1, V2 are closed (FIG. 2 (E), ( F)).

  Next, the refrigerant pipe connection determination operation of the control device 18 of the floor heating system will be described with reference to the flowcharts of FIGS. 3 to 6, the indoor units A and B are connected to the refrigerant pipe connection portions 7A, 7B, 8A and 8B of the outdoor unit 100 via the refrigerant pipe, and the refrigerant pipe connection portion 7C of the outdoor unit 100 is connected. 8C, the floor heating system having a configuration in which the floor heating unit 200 is connected via the refrigerant pipe will be described. However, the refrigerant pipe connection determination operation is performed in the refrigerant pipe connection portion of the outdoor unit according to the connection configuration of the indoor unit and the floor heating unit. Processing is performed.

  First, when the processing of the refrigerant pipe connection determination operation starts, the thermal valves V1 and V2 are opened in step S1 shown in FIG.

  Next, it progresses to step S2 and the driving | operation of the circulation pump 23 of the floor heating unit 200 (shown in FIG. 1) is started.

  And if it determines with predetermined time (for example, 1 minute-2 minutes) having passed by step S3, it will progress to step S4.

  Next, the cooling cycle operation is started in step S4.

  Next, the process proceeds to step S5, the operation of the indoor fan 5A of the indoor unit A (shown as “A” in FIG. 3) is started, the process proceeds to step S6, and the indoor unit B (shown as “B” in FIG. 3) is started. The operation of the indoor fan 5B is started.

  If it is determined in step S7 that the predetermined time has elapsed, the process proceeds to step S8, the operation of the indoor fan 5A of the indoor unit A is stopped, and the process proceeds to step S9, where the operation of the indoor fan 5B of the indoor unit B is stopped.

  Next, in step S11 shown in FIG. 4, the motor-operated valve EVA corresponding to the indoor unit A (shown as “A” in FIG. 3) is opened.

Next, the process proceeds to step S12, and if it is determined that the temperature t _{A of} the indoor heat exchanger 4A detected by the indoor heat exchanger temperature sensor 15A is equal to or lower than the reference temperature T1, the process proceeds to step S21 shown in FIG. In this embodiment, the temperature t _A of the indoor heat exchanger 4A is compared with the reference temperature T1, but it is determined by the amount of change in temperature drop or the gradient of temperature drop with respect to the temperature t _A of the indoor heat exchanger 4A. May be.

On the other hand, if it is determined in step S12 that the temperature t _{A of} the indoor heat exchanger 4A detected by the indoor heat exchanger temperature sensor 15A is higher than the reference temperature T1, the process proceeds to step S13.

  Next, if it is determined in step S13 that the predetermined time has elapsed, the process proceeds to step S14, while if it is determined that the predetermined time has not elapsed, the process returns to step S12.

  In step S14, the refrigerant pipe connection determination unit 18a detects that the refrigerant pipe of the indoor unit A (shown as “A” in FIG. 3) to be connected to the refrigerant pipe connection units 7A and 8A is erroneously connected. In step S15, the electric valve EVA is closed, and in step S16, the circulation pump 23 is stopped. In step S17, the thermal valves V1 and V2 are closed.

  Next, it progresses to step S18, and after stopping driving | operation of the compressor 1 and stopping a cooling cycle driving | operation, this process is complete | finished.

  Next, in step S21 shown in FIG. 5, the operation of the indoor fan 5A of the indoor unit A (shown as “A” in FIG. 3) is started, the process proceeds to step S22, and the indoor unit B (shown as “B” in FIG. 3) is started. The indoor fan 5B shown in FIG.

  If it is determined in step S23 that a certain time has elapsed, the process proceeds to step S24, the operation of the indoor fan 5A of the indoor unit A is stopped, and the process proceeds to step S25, where the operation of the indoor fan 5B of the indoor unit B is stopped.

  Next, in step S26, the electric valve EVB corresponding to the indoor unit B (indicated as “B” in FIG. 3) is opened.

Then, the process proceeds to step S27, if the temperature t _B of the detected indoor heat-exchanger 4B by the indoor heat exchanger temperature sensor 15B is determined to be equal to or less than the reference temperature T1, the process proceeds to step S31 shown in FIG.

On the other hand, if it is determined in step S27 that the temperature t _{B of} the indoor heat exchanger 4B detected by the indoor heat exchanger temperature sensor 15B is higher than the reference temperature T1, the process proceeds to step S28.

  Next, if it is determined in step S28 that the predetermined time has elapsed, the process proceeds to step S29. If it is determined that the predetermined time has not elapsed, the process returns to step S27.

  Then, in step S29, it is detected that the refrigerant pipe of the indoor unit B (shown as “B” in FIG. 3) to be connected to the refrigerant pipe connecting portions 7B and 8B is erroneously connected, and the process proceeds to step S16 shown in FIG. move on.

  Next, in step S31 shown in FIG. 6, the operation of the indoor fan 5A of the indoor unit A (shown as “A” in FIG. 3) is started, the process proceeds to step S32, and the indoor unit B (shown as “B” in FIG. 3) is started. The indoor fan 5B shown in FIG.

  If it is determined in step S33 that the fixed time has elapsed, the process proceeds to step S34, the operation of the indoor fan 5A of the indoor unit A is stopped, and the process proceeds to step S35, where the operation of the indoor fan 5B of the indoor unit B is stopped.

  Next, in step S36, the electric valve EVC corresponding to the floor heating unit 200 (indicated as “C” in FIG. 3) is opened.

Next, the process proceeds to step S37, and if it is determined that the temperature t _{c of the} liquid refrigerant flowing into the hydrothermal exchanger 21 detected by the temperature sensor 32 is equal to or lower than the reference temperature T2, the process proceeds to step S40, and the motor-operated valve EVC is closed. Then, the process proceeds to step S16 shown in FIG. In this embodiment, the temperature t _{c of the} liquid refrigerant flowing into the water heat exchanger 21 and the reference temperature T2 are compared, but the temperature decreases with respect to the temperature t _{c of the} liquid refrigerant flowing into the water heat exchanger 21. You may determine by the variation | change_quantity or the gradient of a temperature fall.

On the other hand, if it is determined in step S37 that the temperature t _{c of the} liquid refrigerant flowing into the water heat exchanger 21 detected by the temperature sensor 32 is higher than the reference temperature T2, the process proceeds to step S38.

  Next, if it is determined in step S38 that the predetermined time has elapsed, the process proceeds to step S39. If it is determined that the predetermined time has not elapsed, the process returns to step S37.

  And in step S39, it detects that it is a misconnection of the refrigerant | coolant piping of the floor heating unit 200 (it shows to "C" in FIG. 3) which should be connected to refrigerant | coolant piping connection part 7C, 8C, and step S16 shown in FIG. Proceed to

  Although not shown in the flowcharts of FIGS. 3 to 6, the operation control unit 18 b (heat pump unit control unit) is detected by the temperature sensor 32 during the refrigerant cycle operation in the refrigerant pipe connection determination operation of the control device 18. Whether a temperature corresponding to the temperature of the water heat exchanger 21 is converted based on the temperature of the liquid refrigerant flowing into the water heat exchanger 21, and whether the converted temperature of the water heat exchanger 21 is 5 ° C. or less. Determine whether. And if the operation control part 18b (heat pump unit control part) determines with the temperature of the water heat exchanger 21 being about 5 degrees C or less, it will reduce the capability of the cooling cycle operation of the outdoor unit 100 from the present capability, or Stop the cooling cycle operation. Thereby, it can prevent that the water heat exchanger 21 is damaged by freezing. The operation control unit 18b (heat pump unit control unit) is configured to detect the water temperature on the outgoing side of the floor heating unit 200 detected by the outgoing water temperature sensor 33 or the outlet side of the water heat exchanger 21 detected by the pressure sensor 31. Based on the refrigerant pressure, a temperature corresponding to the temperature of the water heat exchanger 21 may be converted to determine whether or not the converted temperature of the water heat exchanger 21 is approximately 5 ° C. or less.

  Thus, according to the floor heating system having the above configuration, the indoor units A and B and the floor heating unit 200 are connected to the plurality of refrigerant pipe connection portions 7A, 7B, and 7C of the outdoor unit 100 (heat pump unit) via the refrigerant pipe. , 8A, 8B, 8C, the refrigerant pipe connection determination unit 18a continuously operates the circulation pump 23 provided in the hot water circuit of the floor heating unit 200 in the cooling cycle operation of the outdoor unit 100. In this state, the plurality of electric valves EVA, EVB, EVC respectively corresponding to the plurality of refrigerant pipe connections 7A, 7B, 7C, 8A, 8B, 8C of the outdoor unit 100 are sequentially opened, and the indoor heat exchanger temperature sensor 15A , 15B and the temperature of the liquid refrigerant flowing into the water heat exchanger 21 detected by the temperature sensor 32 based on the temperature of the indoor heat exchangers 4A, 4B. Determining medium pipe connection portion 7A, 7B, 7C, 8A, 8B, the connection between 8C and the refrigerant pipe. That is, the indoor heat exchangers 4A, 4B connected to the refrigerant pipe connection portions (7A, 7B, 7C, 8A, 8B, 8C) corresponding to one open electric valve of the electric valves EVA, EVB, EVC or Since the liquid refrigerant flows into the water heat exchanger 21 and the temperature of the indoor heat exchangers 4A, 4B or the water heat exchanger 21 is lowered, the refrigerant pipe connection determination unit 18a is connected to the refrigerant pipe connection part corresponding to the opened electric valve. It is possible to determine whether or not the correct indoor heat exchanger 4A, 4B or water heat exchanger 21 is connected. At the time of determination by the refrigerant pipe connection determination unit 18a, heat is exchanged by water circulating in the hot water circuit of the floor heating unit 200 by continuously operating the circulation pump 23 disposed in the hot water circuit of the floor heating unit 200, Freezing of the water heat exchanger 21 into which the liquid refrigerant flows can be prevented. In this manner, it is possible to easily detect an incorrect connection of the refrigerant pipes in the cooling cycle operation without freezing the water heat exchanger 21 of the floor heating unit 200.

  Note that the circulation pump 23 disposed in the hot water circuit of the floor heating unit 200 may be intermittently operated during the determination by the refrigerant pipe connection determination unit 18a to prevent the water heat exchanger 21 from freezing.

  In the floor heating system of the present invention, only the floor heating unit 200 may be connected to the plurality of refrigerant pipe connection portions 7A, 7B, 7C, 8A, 8B, 8C of the outdoor unit 100 through the refrigerant pipe. In this case, in the cooling cycle operation of the outdoor unit 100, the refrigerant pipe connection determination unit 18a operates the outdoor unit 100 in a state where the circulation pump 23 disposed in the hot water circuit of the floor heating unit 200 is continuously or intermittently operated. The temperature of the water heat exchanger 21 detected by the temperature sensor 32 by sequentially opening the plurality of electric valves EVA, EVB, EVC respectively corresponding to the plurality of refrigerant pipe connections 7A, 7B, 7C, 8A, 8B, 8C Based on the above, the connection between the plurality of refrigerant pipe connection portions 7A, 7B, 7C, 8A, 8B, 8C and the refrigerant pipe is determined. That is, the liquid refrigerant is connected to the water heat exchanger 21 connected to the refrigerant pipe connection portion (7A, 7B, 7C, 8A, 8B, 8C) corresponding to one open electric valve of the electric valves EVA, EVB, EVC. Flows in and the temperature of the water heat exchanger 21 decreases, so that the refrigerant pipe connection determination unit 18a is connected to the refrigerant pipe connection parts 7A, 7B, 7C, 8A, 8B, and 8C. It becomes possible to determine whether or not.

  In addition, the temperature sensor 32 that detects the inlet refrigerant temperature of the water heat exchanger 21 can accurately capture the temperature drop of the water heat exchanger 21.

  Further, based on the refrigerant pressure of the water heat exchanger 21 detected by the pressure sensor 31, a temperature corresponding to the temperature of the water heat exchanger 21 can be converted, whereby the temperature of the water heat exchanger 21 is decreased. Can be accurately captured.

  Moreover, at the time of determination by the refrigerant pipe connection determination unit 18a, water heat exchange is performed with water circulating in the hot water circuit by opening at least one of the thermal valves V1 to V4 disposed in the hot water circuit of the floor heating unit 200. It is possible to reliably prevent freezing of the water heat exchanger 21 through which heat is exchanged with the liquid refrigerant in the vessel 21 and into which the liquid refrigerant flows.

  The temperature corresponding to the temperature of the water heat exchanger 21 can be converted based on the water temperature on the outgoing side of the floor heating unit 200 detected by the outgoing water temperature sensor 33, and the temperature drop of the water heat exchanger 21 can be converted. May be detected indirectly.

  Further, in the determination by the refrigerant pipe connection determination unit 18a, before opening the plurality of motor-operated valves EVA, EVB, EVC corresponding to the plurality of refrigerant pipe connection parts 7A, 7B, 7C, 8A, 8B, 8C of the outdoor unit 100, respectively. In addition, when the indoor fan 5A, 5B is controlled by the indoor fan control unit 18c and the indoor fans 5A, 5B of the indoor units A, B are operated for a predetermined time and then stopped, the refrigerant pipe connection determination is started. Even if there is a liquid refrigerant pool in the indoor heat exchangers 4A and 4B, the liquid refrigerant pool is eliminated by operating the indoor fans 5A and 5B by heat exchange with the indoor air, and the indoor heat exchangers 4A and 4B The temperature can be made equal to the room temperature, and it is possible to prevent the temperature of the indoor heat exchangers 4A and 4B from being accurately detected due to the liquid refrigerant pool.

  Further, at the time of determination by the refrigerant pipe connection determination unit 18a, the thermal valve control unit 18d opens the thermal valves V1 and V2 before the cooling cycle operation of the outdoor unit 100 (heat pump unit), and the refrigerant pipe connection determination unit 18a Since the circulating pump is operated with the thermal valves V1 and V2 opened, and the cooling cycle operation of the outdoor unit 100 is started when a predetermined time has elapsed from the operation of the circulating pump 23, the thermal valves V1 and V2 For example, when the open state is delayed for 1-2 minutes after energization, the cooling cycle operation of the outdoor unit 100 can be prevented from being performed, and the water heat exchanger can be reliably prevented from freezing. .

  In the said embodiment, not only the plate-type water heat exchanger 21 but a double-pipe type water heat exchanger may be used.

  Moreover, in the said embodiment, although the connection of the refrigerant | coolant piping of the floor heating unit 200 was determined using the temperature sensor 32 which detects the temperature of the liquid refrigerant which flows into the plate-type water heat exchanger 21, this temperature sensor The temperature sensor which detects not only 32 but the temperature of the water heat exchanger itself may be used.

  Although specific embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Compressor 2 ... Four-way valve 3 ... Outdoor heat exchanger 4A, 4B ... Indoor heat exchanger 5A, 5B ... Indoor fan 7A, 7B, 7C, 8A, 8B, 8C ... Refrigerant piping connection part 8 ... Accumulator 11 ... Discharge pipe temperature sensor 12 ... Outdoor heat exchanger temperature sensor 13 ... Outdoor temperature sensor 14A, 14B, 14C ... Temperature sensor 15A, 15B ... Indoor heat exchanger temperature sensor 16A, 16B ... Indoor temperature sensor 17A, 17B, 17C ... Temperature sensor DESCRIPTION OF SYMBOLS 18 ... Control apparatus 18a ... Refrigerant piping connection determination part 18b ... Operation control part 18c ... Indoor fan control part 18d ... Thermal valve control part 21 ... Water heat exchanger 22 ... Expansion tank with positive / negative pressure valve 23 ... Circulation pump 24 ... Outbound header 25 ... Return header 31 ... Pressure sensor 32 ... Temperature sensor 100 ... Outdoor unit 200 ... Heating unit 300, 400 ... Floor heating panel EVA, EVB, EVC ... Electricity Valves V1 to V4 ... Thermal valves

Claims (8)

Floor heating unit (200),
A heat pump unit (100) having a plurality of refrigerant pipe connections (7A, 7B, 7C, 8A, 8B, 8C) to which the floor heating unit (200) is connected via refrigerant pipes;
Temperature detecting means for detecting a temperature of the water heat exchanger (21) of the floor heating unit (200) or a temperature corresponding to the temperature of the water heat exchanger (21);
In the cooling cycle operation of the heat pump unit (100), the heat pump unit (100) is operated with the circulation pump (23) disposed in the hot water circuit of the floor heating unit (200) continuously or intermittently operated. Detected by the temperature detecting means by sequentially opening a plurality of motor-operated valves (EVA, EVB, EVC) respectively corresponding to the plurality of refrigerant pipe connection portions (7A, 7B, 7C, 8A, 8B, 8C) Based on the temperature of the water heat exchanger (21), a refrigerant pipe connection determining unit (7A, 7B, 7C, 8A, 8B, 8C) for determining connection between the refrigerant pipes and the refrigerant pipe ( 18a) and a floor heating system. In the floor heating system according to claim 1,
The floor heating system according to claim 1, wherein the temperature detection means is a temperature sensor (32) for detecting an inlet refrigerant temperature of the water heat exchanger (21). In the floor heating system according to claim 1 or 2,
A floor heating system comprising a pressure sensor (31) for detecting a refrigerant pressure of the water heat exchanger (21). In the floor heating system according to any one of claims 1 to 3,
The floor heating unit (200) has thermal valves (V1 to V4) arranged in the hot water circuit,
A thermal valve control unit (18d) that opens at least one of the thermal valve (V1 to V4) of the floor heating unit (200) at the time of determination by the refrigerant pipe connection determination unit (18a) is provided. A floor heating system characterized by that. In the floor heating system according to any one of claims 1 to 4,
The floor heating system according to claim 1, wherein the temperature detecting means is a water temperature sensor (33) for detecting a water temperature on the forward side of the floor heating unit (200). In the floor heating system according to any one of claims 1 to 5,
When the temperature of the water heat exchanger (21) detected by the temperature detection means is approximately 5 ° C. or lower, the cooling cycle operation capability of the heat pump unit (100) is reduced below the current capability or the cooling operation is performed. A floor heating system comprising a heat pump unit controller (18b) for stopping cycle operation. In the floor heating system according to any one of claims 1 to 6,
At least one air conditioning indoor unit (A, B) is connected to the plurality of refrigerant pipe connections (7A, 7B, 7C, 8A, 8B, 8C) of the heat pump unit (100),
In the determination by the refrigerant pipe connection determination section (18a), the plurality of motor-operated valves (7A, 7B, 7C, 8A, 8B, 8C) respectively corresponding to the plurality of refrigerant pipe connection sections (7A, 7B, 7C, 8A, 8B, 8C) of the heat pump unit (100). Before opening (EVA, EVB, EVC), the indoor fans (5A, 5B) are stopped so that the indoor fans (5A, 5B) of the indoor units (A, B) are stopped after operating for a preset time. A floor heating system comprising an indoor fan control section (18c) for controlling. In the floor heating system according to claim 4,
The thermal valve control unit (18d) opens the thermal valve (V1 to V4) before the cooling cycle operation of the heat pump unit (100) when the refrigerant pipe connection determination unit (18a) determines.
The refrigerant pipe connection determination unit (18a) operates the circulation pump (23) with the thermal valves (V1 to V4) opened, and sets a predetermined time from the operation of the circulation pump (23). A floor heating system, wherein after the elapse of time, the cooling cycle operation of the heat pump unit (100) is started.

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