JP2015224803A - Heat pump hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pump hot water supply device capable of improving accuracy in determining failure of appliances in starting an operation, and implementing a defrosting operation when probability of frost formation on an evaporation heat exchanger exists in starting the operation.SOLUTION: A heat pump hot water supply device 1 includes a heat pump-type heat source machine 3 configured by connecting a compressor 21, a condensation heat exchanger 22, an expansion valve 23 and an evaporation heat exchanger 24 by refrigerant piping 25, and implements defrosting of the evaporation heat exchanger 24 when frost formation of the evaporation heat exchanger 24 is detected. The heat pump hot water supply device further includes a control unit 4 for executing a defrosting operation when a temperature of a refrigerant discharged from the compressor 21 or a temperature of hot water heated by the condensation heat exchanger 22 does not reach first set temperatures respectively determined for each of them or higher within a first set time from the start of the operation of the heat pump-type heat source machine 3.

Description

  The present invention relates to a heat pump hot water supply apparatus, and more particularly to an apparatus for improving the accuracy of equipment failure determination at the start of operation.

  Conventionally, heat pump hot water supply devices have been widely spread. This type of heat pump hot water supply apparatus is a heat pump heat source device that heats hot water with a refrigerant, a hot water storage hot water supply device that includes a hot water storage tank that stores heated hot water, and circulates hot water between the heat pump heat source device and the hot water storage tank. Equipped with a heating circulation circuit, etc., hot water in the hot water storage tank is circulated to the heating circulation circuit and heated by a heat pump heat source machine, and the hot water is returned and stored in the hot water storage tank. Hot water is supplied to a desired hot water supply destination.

  The above heat pump heat source machine is configured by connecting a compressor, a condensation heat exchanger, an expansion valve, and an evaporating heat exchanger via a refrigerant pipe, and uses a refrigerant enclosed in the refrigerant pipe. Hot water supply operation is performed. In this hot water supply operation, the compressor and the blower fan for the evaporative heat exchanger are respectively driven, and heat is exchanged between the refrigerant flowing through the heat pump circuit and the hot water flowing through the heating circuit by the condensation heat exchanger, so that the hot water is supplied. Heated.

  In the heat pump type heat source device described above, the refrigerant absorbs heat from the outside air in the evaporative heat exchanger, and in cold regions and winter, frost is generated by freezing water vapor in the atmosphere attached to the surface of the evaporative heat exchanger. May occur. If frost adheres to the evaporative heat exchanger, the endothermic efficiency in the evaporative heat exchanger will be significantly reduced, and as a result, the operating efficiency of the heat pump heat source machine will be reduced. Is provided with a function of defrosting operation for stopping the hot water supply operation and removing frost adhering to the evaporative heat exchanger.

  By the way, in the above heat pump type heat source device, there is a possibility that the compressor, the expansion valve, etc. may break down due to long-term use or lightning strikes. For this reason, it is desirable for the heat pump hot water supply apparatus to determine the failure of the appliance at the start of operation. Conventionally, if the temperature of the refrigerant discharged from the compressor does not exceed the predetermined temperature before the predetermined time elapses at the start of operation, it is determined that an abnormality has occurred in the appliance, and the heat pump heat source Operation is stopped. In addition, for example, in the hot water supply apparatus disclosed in Patent Document 1, if the temperature of hot water supplied to the hot water storage tank does not reach a predetermined temperature before a predetermined time elapses from the start of operation, it is determined that the appliance has failed.

Japanese Patent No. 4128212

  However, in the function of determining the failure of the conventional heat pump hot water supply device or the hot water supply device of Patent Document 1, when the evaporative heat exchanger is blocked by snow or the like in a cold region or winter, the outside air When heat is not exchanged between the refrigerant and the refrigerant, the temperature of the refrigerant discharged from the compressor or the temperature of the hot water heated by the condensation heat exchanger does not rise at the start of operation, and it is determined that the appliance has failed There is.

  Therefore, at the start of operation of the heat pump water heater, it is determined that the appliance is malfunctioning despite the fact that the appliance such as the compressor and the expansion valve is normal. There is a problem that a predetermined error operation is executed.

  The object of the present invention is to improve the accuracy of equipment failure determination at the start of operation in a heat pump hot water supply device, and to perform defrosting operation when there is a possibility of frost formation on the evaporative heat exchanger at the start of operation Is to provide something.

  The heat pump hot water supply apparatus according to claim 1 includes a heat pump heat source device in which a compressor, a condensing heat exchanger, an expansion means, and an evaporating heat exchanger are connected by refrigerant piping, and detects frost formation on the evaporating heat exchanger. In such a case, in the heat pump water heater for defrosting the evaporative heat exchanger, the temperature of the refrigerant discharged from the compressor or the condensation heat exchange within the first set time from the start of operation of the heat pump heat source unit When the hot water temperature heated with a container does not become more than the 1st preset temperature set to each, the control means which performs a defrost operation is provided.

  According to a second aspect of the present invention, there is provided the heat pump hot water supply apparatus according to the first aspect of the invention, wherein the control means does not cause the refrigerant temperature or the hot water temperature to become equal to or higher than the first set temperature within a second set time after the defrosting operation ends. In some cases, it is determined that the instrument is out of order and a predetermined error operation is executed.

  According to a third aspect of the present invention, there is provided the heat pump hot water supply apparatus according to the first or second aspect of the invention, wherein when the outside air temperature is equal to or higher than the second set temperature, the control means is a malfunction of the appliance without performing the defrosting operation. And a predetermined error operation is executed.

  According to the invention of claim 1, in the heat pump hot water supply apparatus, the coolant temperature discharged from the compressor or the hot water temperature heated by the condensation heat exchanger is within the first set time from the start of operation of the heat pump heat source device. When the temperature does not exceed the first set temperature set for each, since the control means for performing the defrosting operation is provided, when no increase in the refrigerant temperature or the hot water temperature is observed at the start of the operation, to the evaporative heat exchanger The defrosting operation can be executed as there is a possibility of frost formation and the accuracy of failure determination can be improved by preventing the erroneous determination that the device is malfunctioning despite being normal. it can.

  According to invention of Claim 2, a control means determines with it being a failure of an instrument, when refrigerant | coolant temperature or hot water temperature does not become more than 1st setting temperature within 2nd setting time after completion | finish of defrost operation. Therefore, when the refrigerant temperature or the hot water temperature does not increase even when the defrosting operation is performed, it is possible to reliably determine that the instrument has failed.

  According to the invention of claim 3, when the outside air temperature is equal to or higher than the second set temperature, the control means determines that the instrument is out of order without executing the defrosting operation and executes a predetermined error operation. Therefore, when the outside air temperature is high, frost formation on the evaporative heat exchanger does not occur. Therefore, the failure determination time can be shortened by not performing the defrosting operation.

It is a schematic block diagram of the heat pump hot-water supply apparatus which concerns on Example 1 of this invention. It is a flowchart of failure determination operation control. 7 is a flowchart of failure determination operation control according to the second embodiment.

  Hereinafter, modes for carrying out the present invention will be described based on examples.

First, the whole structure of the heat pump hot-water supply apparatus 1 which concerns on this invention is demonstrated.
As shown in FIG. 1, a heat pump hot water supply apparatus 1 controls a hot water storage hot water supply apparatus 2 having a hot water storage tank 5 for storing hot water, a heat pump heat source apparatus 3 for heating hot water in the hot water storage tank 5, and a heat pump hot water supply apparatus 1. Heating circuit 8a, 8b etc. which circulate hot water between the control unit 4, the hot water storage hot-water supply apparatus 2, and the heat pump type heat source machine 3 are comprised.

  As shown in FIG. 1, a hot water storage and hot water supply apparatus 2 includes a hot water storage tank 5 having a vertically long cylindrical outer peripheral surface, various pipes 6, 7, 8 a and 8 b, a hot water circulation pump 11, an on-off valve 12, a mixing valve 13, A control unit 16, an outer case 17, and the like are provided. The hot water storage tank 5 stores high-temperature hot water (for example, 65 to 90 ° C.) heated by the heat pump heat source unit 3. In the hot water storage tank 5, a plurality of hot water temperature sensors 5a to 5d are arranged at predetermined intervals in the height direction.

  A water supply pipe 6 and an upstream heating circulation circuit 8 a are connected to the lower end of the hot water storage tank 5. The water supply pipe 6 is provided with an on-off valve 12 for supplying low temperature clean water to the hot water storage tank 5. The upper end of the hot water storage tank 5 is connected to a downstream heating circulation circuit 8b and a hot water discharge pipe 7, and hot hot water returned from the heating circulation circuit 8b is stored in the hot water storage tank 5, and the hot water storage tank 5 is used for hot water supply. The hot water in the inside can be supplied to the tap pipe 7.

  The outer case 17 is formed in a thin steel plate box shape, and includes a hot water storage tank 5, various pipes 6, 7, a part of the heating circulation circuits 8 a, 8 b, a hot water circulation pump 11, an on-off valve 12, a mixing valve 13, Various hot water temperature sensors 15a to 15d, a main control unit 16 and the like are accommodated. The hot water temperature sensor 15a is provided on the outlet side of the heat exchanger passage portion 22a of the condensing heat exchanger 22 in the heating circuit 8b and detects the temperature of hot water flowing out of the heat exchanger passage portion 22a. A signal is supplied to the main control unit 16.

Next, the heat pump heat source machine 3 will be described.
As shown in FIG. 1, the heat pump heat source device 3 includes a heat pump circuit 20 that heats hot and cold water with a refrigerant, an auxiliary control unit 43 that is connected to the main control unit 16 and controls the heat pump heat source device 3, and an exterior housing these components. A case 45 and the like are provided. The heat pump heat source unit 3 further includes a blower fan 27 for an evaporative heat exchanger driven by a blower motor 27a, a bypass passage 31 for a defrosting operation, and a defrost valve 32.

  The heat pump circuit 20 includes a compressor 21, a condensing heat exchanger 22 for heating hot water, an expansion valve 23 for rapidly expanding a high-pressure refrigerant to lower the temperature and pressure, and an evaporation heat exchanger 24 for absorbing outside air heat, These devices 21 to 24 are configured to be connected via a refrigerant pipe 25 and perform a hot water supply operation using a refrigerant accommodated in the refrigerant pipe 25.

  The compressor 21 is a known hermetic compressor that adiabatically compresses a refrigerant in a gas phase state to increase the temperature.

  The condensing heat exchanger 22 is configured by a double pipe having a heat exchanger passage portion 22 a installed between the heating circulation circuits 8 a and 8 b and an internal passage 22 b that is a part of the refrigerant pipe 25. In the condensing heat exchanger 22, heat is exchanged between the refrigerant flowing in the internal passage 22b and hot water supplied to the heat exchanger passage portion 22a from the heating circuit 8a, the hot water is heated, the refrigerant is cooled and liquefied.

  The expansion valve 23 (corresponding to the expansion means) adiabatically expands the liquid phase refrigerant and lowers the temperature. The expansion valve 23 is a control valve having a variable throttle amount. An expansion valve with a constant throttle amount may be used instead of the expansion valve 23 with a variable throttle amount.

  The evaporative heat exchanger 24 has an evaporator passage portion 24a included in the refrigerant pipe 25, and the evaporator passage portion 24a has a heat transfer tube and a plurality of fins. In the evaporative heat exchanger 24, heat is exchanged between the refrigerant flowing through the evaporator passage portion 24a and the outside air, and the refrigerant absorbs heat from the outside air and vaporizes.

  The refrigerant pipe 25 includes a refrigerant passage 25 a that connects the discharge side of the compressor 21 and the inlet side of the condensation heat exchanger 22, and a refrigerant passage 25 b that connects the outlet side of the condensation heat exchanger 22 and the inlet side of the expansion valve 23. The refrigerant passage 25c connects the outlet side of the expansion valve 23 and the inlet side of the evaporation heat exchanger 24, and the refrigerant passage 25d connects the outlet side of the evaporation heat exchanger 24 and the introduction side of the compressor 21. .

  The refrigerant pipe 25 is provided on the discharge side of the compressor 21 and detects the temperature of the refrigerant discharged from the compressor 21. The refrigerant discharge side temperature sensor 29 a is provided on the inlet side of the expansion valve 23 and flows into the expansion valve 23. An expansion valve inlet side temperature sensor 29b for detecting the refrigerant temperature to be detected, an expansion valve outlet side temperature sensor 29c provided on the outlet side of the expansion valve 23 and detecting the refrigerant temperature flowing out of the expansion valve 23, and an outlet of the evaporative heat exchanger 24 An evaporative heat exchanger outlet side temperature sensor 29d that detects the temperature of the refrigerant flowing out from the evaporative heat exchanger 24 is provided. The exterior case 45 or the evaporation heat exchanger 24 is provided with an outside air temperature sensor 29e that detects the outside air temperature.

  The refrigerant pipe 25 is provided with a bypass passage 31 connected to the refrigerant passage 25a and the refrigerant passage 25c so as to bypass the condensation heat exchanger 22 and the expansion valve 23. The bypass passage 31 is provided with a defrost valve 32 that is connected in parallel to the condensation heat exchanger 22 and the expansion valve 23 and that is controlled to open and close by the auxiliary control unit 43 during the defrost operation. When the frost formation of the evaporative heat exchanger 24 is detected, the defrost valve 32 is opened and the defrost operation is performed.

  During the hot water supply operation of the heat pump heat source device 3, the heated refrigerant compressed to a high pressure by the compressor 21 is sent to the condensation heat exchanger 22 and heated from the lower end of the hot water storage tank 5 by driving the hot water circulation pump 11. Heat is exchanged with water flowing into the heat exchanger passage 22a through the circulation circuit 8a to warm the water, and the liquefied refrigerant is cooled to the expansion valve 23, and the heated hot water passes through the heating circuit 8b. The hot water is stored in the hot water storage tank 5 of the hot water storage hot water supply device 2 and the hot water is stored in the hot water storage tank 5 by repeating the heating operation via the heat pump heat source unit 3.

Next, the control unit 4 will be described.
As shown in FIG. 1, the heat pump hot water supply apparatus 1 is controlled by a control unit 4 including a main control unit 16 and an auxiliary control unit 43. Detection signals from various temperature sensors and the like are transmitted to the control unit 4, and the control unit 4 controls the operation of the hot water storage hot water supply device 2 and the heat pump heat source unit 3, the operation / stop of various pumps, and the open / close states of various valves. Various operations (hot water supply operation, defrosting operation, etc.) are executed by controlling switching and opening degree adjustment.

  The main control unit 16 can communicate data with the operation remote controller 46 that can be operated by the user. When the target hot water temperature is set by operating the switch of the operation remote controller 46, the target hot water temperature data is transferred from the operation remote controller 46. It is transmitted to the main control unit 16. The auxiliary control unit 43 is capable of data communication with the main control unit 16, and in accordance with instructions from the main control unit 16, various devices (the compressor 21, the expansion valve 23, the blower motor 27 a, the removal device) of the heat pump heat source unit 3. Drive control of the frost valve 32 and the like is performed.

Next, failure determination operation control related to the present invention will be described.
The control unit 4 (corresponding to the control means), when the refrigerant temperature discharged from the compressor 21 does not exceed the first set temperature within the first set time from the start of operation of the heat pump heat source unit 3, If the refrigerant temperature does not exceed the first set temperature within the second set time after completion of the defrost operation, it is determined that the instrument is malfunctioning, and a predetermined error operation is executed. Further, when the outside air temperature is equal to or higher than the second set temperature, it is possible to execute failure determination operation control in which it is determined that there is a failure of the instrument without executing the defrosting operation and a predetermined error operation is performed.

  Next, the failure determination operation control that is automatically executed by the control unit 4 when starting the operation of the heat pump heat source apparatus 3 will be described based on the flowchart of FIG. In the figure, the symbol Si (i = 1, 2,...) Indicates each step. The control program for the failure determination operation control is stored in the control unit 4 in advance.

  In the flowchart of FIG. 2, when this control is started, first in S1, the control unit 4 determines whether or not the operation (startup) of the heat pump heat source unit 3 has been started, If it is determined that the operation of the heat pump heat source apparatus 3 is started based on a timer or the like, the determination of S1 is Yes, the process proceeds to S2, and S1 is repeated while the determination of S1 is No.

  Next, in S2, various devices (compressor 21, expansion valve 23, blower motor 27a, etc.) of the heat pump heat source unit 3 are controlled under normal startup conditions, so that the operation of the heat pump heat source unit 3 is performed. Start, set the count N to 0, and proceed to S3.

  Next, in S3, it is determined whether or not the first set time has elapsed (the time for which the output of the heat pump heat source machine 3 becomes stable, for example, about 15 to 20 minutes), and the first set time has elapsed. In this case, the determination of S3 is Yes, the process proceeds to S4, and if the determination of S3 is No, S3 is repeated.

  Next, in S4, the detection signal of the compressor discharge side temperature sensor 29a is read, and based on this detection signal, the control unit 4 calculates the discharge refrigerant temperature discharged from the compressor 21, and proceeds to S5.

  Next, in S5, it is determined whether or not the discharged refrigerant temperature is lower than a first set temperature (for example, about 40 to 70 degrees), and when the discharged refrigerant temperature is lower than the first set temperature (when not higher than the first set temperature). ), The determination of S5 is Yes, and the process proceeds to S6. If the discharged refrigerant temperature is equal to or higher than the first set temperature, the determination in S5 is No, the process proceeds to S7, the apparatus of the heat pump heat source unit 3 is determined to be normal, and the process returns. The first set temperature is preferably set to a temperature that is about 20 ° C. lower than the required refrigerant discharge temperature.

  Next, in S6, it is determined whether or not the count N (the number of executions of the defrosting operation) is less than a set number (for example, 2 times). If the count N is less than the set number, the determination in S6 is Yes. If the count N is equal to or greater than the set number, the determination in S6 is No and the process moves to S9.

  Next, in S8, the detection signal of the outside air temperature sensor 29e is read, and based on this detection signal, the control unit 4 calculates the outside air temperature of the heat pump heat source unit 3, and proceeds to S10.

  Next, in S10, it is determined whether or not the outside air temperature is lower than a second set temperature (for example, about 5 ° C.). When the outside air temperature is lower than the second set temperature (when not higher than the second set temperature), If the determination in S10 is Yes, the process proceeds to S11, and the outside air temperature is equal to or higher than the second set temperature, the determination in S10 is No, the process proceeds to S14, and it is determined that the heat pump heat source unit 3 has failed. . That is, when the outside air temperature is equal to or higher than the second set temperature, it is determined that the instrument has failed without performing the defrosting operation.

  Next, in S11, a defrosting operation is executed for a predetermined time (for example, about 5 to 10 minutes), and (N + 1) is set in the count N. That is, when the refrigerant temperature discharged from the compressor 21 does not become the first set temperature or more within the first set time from the start of operation of the heat pump heat source apparatus 3, the outside air temperature is the second set temperature or more. If not, the defrosting operation is performed.

  In the defrosting operation, the control unit 4 stops the blower fan 27, switches the defrost valve 32 to the open state, and switches the expansion valve 23 to the fully closed state. Then, if the heat pump heat source unit 3 is normal, the high-temperature and high-pressure refrigerant discharged from the compressor 21 does not flow to the condensation heat exchanger 22 but flows to the evaporation heat exchanger 24 through the bypass passage 31 and evaporates. When frost adheres to the heat exchanger 24, defrosting is performed by melting the frost. After the predetermined time has elapsed, the defrosting operation is terminated, the normal operation is restored, and the process proceeds to S4.

  In S4 after S11, the detection signal of the compressor discharge side temperature sensor 29a is read, and based on this detection signal, the control unit 4 calculates the discharge refrigerant temperature discharged from the compressor 21, and proceeds to S5. If the discharged refrigerant temperature is lower than the first set temperature, the determination in S5 is Yes, and the process proceeds to S6. In S6, if the count N is equal to or greater than the set number of times, that is, the defrosting operation is executed for the set number of times. If yes, the determination in S6 is No, and the process proceeds to S9.

  Next, in S9, it is determined whether or not the second set time has elapsed (the time when the output becomes stable after the defrosting operation is completed, for example, about 5 minutes). Yes, and the process proceeds to S12. If the determination of S9 is No, S9 is repeated.

  Next, in S12, the detection signal of the compressor discharge side temperature sensor 29a is read, and based on this detection signal, the control unit 4 calculates the discharge refrigerant temperature discharged from the compressor 21, and proceeds to S13.

  Next, in S13, it is determined whether or not the discharged refrigerant temperature is lower than a first set temperature (for example, about 40 to 70 degrees), and when the discharged refrigerant temperature is lower than the first set temperature (when not higher than the first set temperature). ), The determination in S13 is Yes, the process proceeds to S14, and it is determined that the appliance of the heat pump heat source apparatus 3 has failed. That is, when the refrigerant temperature does not exceed the first set temperature within the second set time after the end of the defrosting operation, it is determined that the instrument has failed. When the discharged refrigerant temperature is equal to or higher than the first set temperature, the determination in S13 is No, the process proceeds to S7, the apparatus of the heat pump heat source unit 3 is determined to be normal, and the process returns.

  Next, in S15, since it is determined in S14 that the instrument is malfunctioning, a predetermined error operation is executed. That is, since an abnormality has occurred in the heat pump type heat source unit 3, the operation of the heat pump type heat source unit 3 is stopped as a predetermined error operation, and the failure of the appliance is indicated to the user via the display of the operation remote controller 46, voice or the like. Then, a series of control is terminated.

Next, the effect | action and effect of the heat pump hot-water supply apparatus 1 of this invention are demonstrated.
The heat pump hot water supply device 1 executes the defrosting operation when the refrigerant temperature discharged from the compressor 21 does not become the first set temperature or less within the first set time from the start of the operation of the heat pump heat source device 3. Since the control unit 4 is provided, if no increase in the refrigerant temperature is observed at the start of operation, the defrosting operation can be performed because there is a possibility of frost formation on the evaporating heat exchanger 24, and the appliance is normal. The accuracy of failure determination can be improved by preventing an erroneous determination that there is a failure despite being present.

  In addition, when the refrigerant temperature does not become the first set temperature or less within the second set time after the defrosting operation is completed, the control unit 4 determines that the instrument is faulty and executes a predetermined error operation. If the refrigerant temperature does not increase even after the defrosting operation is performed, it can be determined that the instrument has failed.

  Further, when the outside air temperature is equal to or higher than the second set temperature, the control unit 4 determines that the instrument is out of order without performing the defrosting operation and executes a predetermined error operation, so the outside air temperature is high. In this case, since no frost is generated on the evaporative heat exchanger 24, failure determination time can be reduced by not performing the defrosting operation.

  Next, a second embodiment in which the failure determination operation control of the first embodiment is partially changed will be described. In the first embodiment, the refrigerant temperature discharged from the compressor 21 is used for determining the failure of the appliance. In the second embodiment, the temperature of hot water heated by the condensing heat exchanger 24 is used. .

  The failure determination operation control automatically executed by the control unit 4 when starting the operation of the heat pump heat source apparatus 3 will be described based on the flowchart of FIG. In the figure, the symbol Si (i = 1, 2,...) Indicates each step. The control program for the failure determination operation control is stored in the control unit 4 in advance. In addition, since S1-S3, S6-S11, S14, and S15 are the same as that of Example 1, description is abbreviate | omitted.

  First, in S16 instead of S4 in FIG. 2 of the first embodiment, the detection signal of the hot water temperature sensor 15a is read, and based on this detection signal, the control unit 4 causes the heat exchanger passage of the condensation heat exchanger 22 to be read. The hot water temperature flowing out from the section 22a is calculated, and the process proceeds to S17.

  Next, in S17 instead of S5 in FIG. 2 of the first embodiment, it is determined whether or not the hot water temperature is lower than a first set temperature (for example, about 40 to 70 degrees), and the hot water temperature is lower than the first set temperature. In the case of (when the temperature is not equal to or higher than the first set temperature), the determination in S17 is Yes, and the process proceeds to S6. When the hot water temperature is equal to or higher than the first set temperature, the determination in S17 is No, the process proceeds to S7, it is determined that the heat pump heat source unit 3 is normal, and the process returns. The first set temperature is preferably set to a temperature that is about 20 ° C. lower than the required hot water temperature.

  Next, in S18 instead of S12 of FIG. 2 of the first embodiment, the detection signal of the hot water temperature sensor 15a is read, and based on this detection signal, the control unit 4 causes the heat exchanger passage of the condensation heat exchanger 22 to be read. The hot water temperature flowing out from the section 22a is calculated, and the process proceeds to S19.

  Next, in S19 instead of S13 in FIG. 2 of the first embodiment, it is determined whether or not the hot water temperature is lower than a first set temperature (for example, about 40 to 70 degrees), and the hot water temperature is lower than the first set temperature. In the case of (when the temperature is not equal to or higher than the first set temperature), the determination in S19 is Yes, and the process proceeds to S14. When the hot water temperature is equal to or higher than the first set temperature, the determination in S19 is No, the process proceeds to S7, the heat pump heat source unit 3 is determined to be normal, and the process returns.

  Thus, the heat pump hot-water supply apparatus 1 is, when the hot water temperature heated with the condensation heat exchanger 24 does not become more than 1st setting temperature within 1st setting time from the operation start of the heat pump type heat source unit 3, Since the control unit 4 that performs the defrosting operation is provided, if no increase in hot water temperature is observed at the start of operation, the defrosting operation may be performed on the assumption that there is a possibility of frost formation on the evaporation heat exchanger 24. It is possible to improve the accuracy of the failure determination by preventing the erroneous determination that the device is defective even though it is normal.

Next, a mode in which the first and second embodiments are partially changed will be described.
[1] In the first and second embodiments, the first set time, the second set time, the first set temperature, and the second set temperature are merely examples, and the functions and outputs of the heat pump hot water supply device 1 are shown. It can be appropriately changed according to the above.

[2] In the first and second embodiments, the bypass passage 31 is provided so as to bypass the condensing heat exchanger 22 and the expansion valve 23, but the expansion valve 23 can be set to a fully open state during the defrosting operation. If so, it may be provided so as to bypass only the condensation heat exchanger 22.

[3] In addition, those skilled in the art can implement the present invention in various forms with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. It is.

DESCRIPTION OF SYMBOLS 1 Heat pump hot water supply apparatus 3 Heat pump type heat source machine 4 Control unit 21 Compressor 22 Condensation heat exchanger 23 Expansion valve 24 Evaporation heat exchanger 25 Refrigerant piping

Claims (3)

A heat pump heat source device in which a compressor, a condensing heat exchanger, an expansion means, and an evaporating heat exchanger are connected by refrigerant piping, and when frosting of the evaporating heat exchanger is detected, the evaporating heat exchange In the heat pump water heater that defrosts the oven,
Within a first set time from the start of operation of the heat pump heat source machine, the refrigerant temperature discharged from the compressor or the hot water temperature heated by the condensation heat exchanger is equal to or higher than the first set temperature set for each. If not, a heat pump hot water supply apparatus comprising control means for performing a defrosting operation.   If the refrigerant temperature or the hot water temperature does not exceed the first set temperature within the second set time after the end of the defrosting operation, the control means determines that there is a malfunction of the appliance and determines a predetermined error. 2. The heat pump hot water supply apparatus according to claim 1, wherein the operation is performed. The said control means determines that it is a failure of an instrument, and performs a predetermined | prescribed error operation | movement, without performing the said defrost operation, when outside temperature is more than 2nd setting temperature. The heat pump hot-water supply apparatus of 1 or 2.