JP6198796B2 - Heat pump type heating device - Google Patents

Description

  The present invention relates to a heat pump heating device including a heating heat exchanger and the like.

  As a prior art, there is a heat pump heating device having a heat pump unit and a heating circuit through which hot water heated by the heat pump unit flows. In this heat pump heating device, when the heating terminal to which the heating circuit is connected is no longer used, it is not necessary to heat the hot water by the heat pump unit, but the compressor of the heat pump unit has started the operation and the minimum operation time has elapsed. Until it is done, it cannot be stopped. Therefore, in the heat pump heating device of Patent Document 1, when a heating terminal bypass is added to the heating circuit and there is a stop instruction from the start of operation until the minimum operation time elapses, the heating circuit until the minimum operation time elapses. Continue to operate the compressor without stopping the hot water flow.

Japanese Patent No. 5721196

  In the heat pump heating device of Patent Document 1, it is necessary to add a bypass of the heating terminal to the heating circuit, and a high pressure abnormality may occur because the heat of the hot water heated by the heat pump unit in the heating circuit cannot be exhausted. .

  Accordingly, the present invention has been made to solve the above-described problems, and is a heat pump type that can prevent a high-pressure abnormality from occurring when there is a stop instruction from the start of operation until the minimum operation time has elapsed. An object is to provide a heating device.

A heat pump heating device according to a first aspect of the present invention includes a compressor, a heat source side heat exchanger, a refrigerant circuit provided with an electric valve and a use side heat exchanger, an outdoor fan for the heat source side heat exchanger, Control means for controlling the compressor, the motor-operated valve and the outdoor fan based on an operation start instruction and an operation stop instruction, and the control means starts the minimum operation after starting the operation based on the operation start instruction. When the operation stop instruction is issued before the time has elapsed, the frequency reduction control is performed to reduce the frequency of the compressor from the frequency when the operation stop instruction is issued until the minimum operation time elapses. Opening increase control to increase the opening from the opening when the operation stop instruction is given, and rotation speed reduction control to reduce the outdoor fan rotation speed from the rotation speed when the operation stop instruction is issued And performing at least one.

  In this heat pump type heating device, if there is an operation stop instruction until the minimum operation time elapses after starting operation based on the operation start instruction, the frequency of the compressor is operated until the minimum operation time elapses. Decrease the frequency from the frequency when the stop command is issued, and increase the opening of the motorized valve from that when the stop command is issued, or the rotation speed of the outdoor fan when the stop command is issued By reducing it further, low load operation is performed. Therefore, even if it is a case where the heat of the hot water heated by the heat pump unit cannot be exhausted in the heating circuit in which the use side heat exchanger is arranged, it is possible to prevent a high pressure abnormality from occurring.

  In the heat pump heating device according to the second invention, in the first invention, the use side heat exchanger is capable of heating the hot water flowing through the heating circuit to which the use side terminal is connected, and based on an operation start instruction. When an operation stop instruction is given before the minimum operation time elapses after the operation is started, the flow of hot water in the heating circuit is stopped until the minimum operation time elapses.

  In this heat pump type heating device, when there is an operation stop instruction until the minimum operation time elapses after starting operation based on the operation start instruction, a high-pressure abnormality occurs due to low load operation being performed. Since it can prevent, the flow of the hot water of the heating circuit where the use side heat exchanger is arranged can be stopped. Therefore, it is not necessary to add a heating terminal bypass to the heating circuit.

  In the first invention, when there is an operation stop instruction until the minimum operation time elapses after starting operation based on the operation start instruction, the operation of the compressor is stopped until the minimum operation time elapses. Decrease the frequency from the frequency when the instruction is given, and increase the opening of the motorized valve from the opening when the instruction to stop operation is given, or the rotational speed of the outdoor fan from the speed when the instruction to stop operation is given By reducing, low load operation is performed. Therefore, even if it is a case where the heat of the hot water heated by the heat pump unit cannot be exhausted in the heating circuit in which the use side heat exchanger is arranged, it is possible to prevent a high pressure abnormality from occurring.

  In the second aspect of the present invention, when there is an operation stop instruction until the minimum operation time elapses after starting operation based on the operation start instruction, a high-pressure abnormality is prevented from being caused by low load operation. Since it can do, the flow of the hot water of the heating circuit where the use side heat exchanger is arranged can be stopped. Therefore, it is not necessary to add a heating terminal bypass to the heating circuit.

It is a block diagram which shows the heat pump type heating apparatus of embodiment of this invention. It is a front view of the outdoor unit contained in the heat pump type heating apparatus of FIG. FIG. 3A is a partial cutaway view illustrating the internal configuration of the heat pump unit and the water unit when the outdoor unit is viewed from the front, and FIG. 3B is the water when the outdoor unit is viewed from above. FIG. 3C is a partial cutaway view for explaining the internal configuration of the unit, and FIG. 3C is a partial cutaway view for explaining the arrangement of the hot water supply water pipe connection portion and the heating water pipe connection portion when the outdoor unit is viewed from the right side surface. is there. 4 (a) and 4 (b) are a perspective view and a side view of a hot water supply heat exchanger and a heating heat exchanger, respectively. It is a block diagram of the control part of the heat pump type heating apparatus of FIG. It is a flowchart about the operation stop operation | movement of the heat pump type heating apparatus of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, the heat pump heating device (outdoor unit) 1 includes a heat pump unit 2 and a water unit unit 3 disposed above the heat pump unit 2. The heat pump unit 2 accommodates a compressor 10, an outdoor heat exchanger (heat source side heat exchanger) 11, an electric valve 12, and an outdoor fan 13. The water unit 3 accommodates a hot water supply heat exchanger (use side heat exchanger) 16A, a heating heat exchanger (use side heat exchanger) 16B, and a water supply pump 17.

  Inside the outdoor unit 1, a refrigerant circuit (heat pump) in which refrigerant circulates is configured. This refrigerant circuit has a main flow path 23, a first flow path 24, a second flow path 25, and a low pressure flow path 26.

  In the main flow path 23, the compressor 10, the outdoor heat exchanger 11, and the motor operated valve 12 are provided in order. A four-way switching valve 18 is connected to the discharge side of the compressor 10 disposed on one end side of the outdoor heat exchanger 11.

  The first flow path 24 and the second flow path 25 branch at the four-way switching valve 18 disposed on the discharge side of the compressor 10, and in the junction 19 disposed on the other end side of the outdoor heat exchanger 11. Join. A service port 41 communicating with the refrigerant circuit is disposed between the junction 19 of the main flow path 23 and the motor operated valve 12. The service port 41 is used, for example, for injecting refrigerant from the outside into the refrigerant circuit during maintenance or discharging the refrigerant from the refrigerant circuit to the outside.

  During the heating operation, the first flow path 24 connects the four-way switching valve 18 provided on the downstream side of the compressor 10 in the main flow path 23 and the merging portion 19 provided on the upstream side of the motor operated valve 12. The first flow path 24 is provided with a hot water supply heat exchanger 16A, and a first check valve 44 disposed between the hot water supply heat exchanger 16A and the merging portion 19. The first check valve 44 allows the flow of the refrigerant from the hot water supply heat exchanger 16A to the merging portion 19, but the refrigerant flows from the merging portion 19 to the hot water supply heat exchanger 16A (first flow path 24). Shut off.

  The second flow path 25 connects the four-way switching valve 18 and the junction 19 in parallel with the first flow path 24. The second flow path 25 is provided with a heating heat exchanger 16B, a receiver 46, and a second check valve 48. The second check valve 48 allows the refrigerant to flow from the heating heat exchanger 16B to the merging section 19, but the refrigerant flows from the merging section 19 to the heating heat exchanger 16B (second flow path 25). Shut off.

  The receiver 46 is a container for storing a refrigerant. Of the first channel 24 and the second channel 25, the heating heat exchanger 16 </ b> B and the second check valve 48 in the second channel 25 having a small refrigerant capacity. It is provided in between.

  The second check valve 48 is disposed between the heating heat exchanger 16B and the merging portion 19 (downstream of the heating heat exchanger 16B and upstream of the merging portion 19).

  The low-pressure channel 26 connects the four-way switching valve 18 and the suction side of the compressor 10. The suction side of the compressor 10 refers to between the motor-operated valve 12 and the compressor 10, but the low-pressure flow path 26 is particularly connected between the compressor 10 and the outdoor heat exchanger 11.

  The hot water supply pump 17 supplies the hot water for hot water flowing out of the hot water supply tank 5 to the hot water supply heat exchanger 16 </ b> A and circulates the hot water for hot water supplied to the hot water supply tank 5.

  In the refrigerant circuit described above, the four-way switching is performed so that the refrigerant discharged from the compressor 10 flows in one of the first flow path 24 and the second flow path 25 and does not flow in the other flow path. The valve 18 is switched between a first state and a second state described later.

  In the first state, the refrigerant discharged from the compressor 10 flows to the first flow path 24 and does not flow to the second flow path 25, and the second flow path 25 is connected to the low pressure side of the main flow path 23. Specifically, regarding the hot water supply heat exchanger 16A through which the refrigerant flows, the discharge side of the compressor 10 is connected to the refrigerant inlet of the first flow path 24 via the four-way switching valve 18. An electric valve 12 is connected to the refrigerant outlet. Regarding the second flow path 25 through which the refrigerant does not flow, one end is connected to the low pressure flow path 26 via the four-way switching valve 18, and the other end is connected to the junction 19.

  In the first state, as shown by a solid line in FIG. 1, the refrigerant discharged from the compressor 10 flows into the first flow path 24 via the four-way switching valve 18. And after exchanging heat with water in the hot water heat exchanger 16 </ b> A, the electric valve 12 is reached via the junction 19. On the other hand, the refrigerant in the second flow path 25 flows into the low pressure flow path 26 via the four-way switching valve 18 and is sucked into the compressor 10. However, after the refrigerant in the second flow path 25 is sucked into the compressor 10, there is the second check valve 48, so that the refrigerant on the merging portion side 19 from the second check valve 48 is sucked into the compressor 10. It will never be done.

  In the second state, the refrigerant discharged from the compressor 10 flows into the second flow path 25 and does not flow into the first flow path 24, and the first flow path 24 is connected to the low pressure side of the main flow path 23. Specifically, with respect to the heating heat exchanger 16B through which the refrigerant flows, the refrigerant inlet of the second flow path 25 is connected to the discharge side of the compressor 10 via the four-way switching valve 18, and the second flow path 25 An electric valve 12 is connected to the refrigerant outlet. Regarding the first flow path 24 through which the refrigerant does not flow, one end is connected to the low pressure flow path 26 via the four-way switching valve 18, and the other end is connected to the junction 19.

  In the second state, as shown by the dotted line in FIG. 1, the refrigerant discharged from the compressor 10 flows into the second flow path 25 via the four-way switching valve 18. And after exchanging heat with water with the heat exchanger 16B for heating, it arrives at the motor operated valve 12 through the junction part 19. FIG. On the other hand, the refrigerant in the first flow path 24 flows into the low pressure flow path 26 via the four-way switching valve 18 and is sucked into the compressor 10. However, after the refrigerant in the first flow path 24 is sucked into the compressor 10, the first check valve 44 is provided, so that the refrigerant on the merging portion side 19 from the first check valve 44 is sucked into the compressor 10. It will never be done.

  The water unit 3 has a hot water supply water pipe connection part 20 and a heating water pipe connection part 21. The hot water supply water pipe connection portion 20 has an outward connection portion 20a and a return connection portion 20b, and the heating water pipe connection portion 21 has an outward connection portion 21a and a return connection portion 21b.

  Inside the water unit 3, the forward connection 20a of the hot water supply water pipe connection 20 is connected to the water outlet of the hot water supply heat exchanger 16A in the first state, and the return connection 20b of the hot water supply water pipe connection 20 is The hot water supply heat exchanger 16A is connected to the water inlet. Accordingly, the hot water supply circuit is configured by connecting the hot water supply heat exchanger 16A, the hot water supply tank 5, and the hot water supply pump 17.

  In the hot water supply heat exchanger 16A, between the refrigerant flowing in from the four-way switching valve 18 on the discharge side of the compressor 10 and the hot water supply hot water flowing in from the return connection portion 20b of the hot water supply water pipe connection portion 20 in the first state. As a result of the heat exchange, the hot water for hot water supply is heated, and the heated hot water for hot water supply flows out toward the forward connection portion 20 a of the hot water supply water pipe connection portion 20.

  Inside the water unit 3, the forward connection 21 a of the heating water pipe connection 21 is connected to the water outlet of the heating heat exchanger 16 B in the second state, and the return connection 21 b of the heating water pipe connection 21 is , Connected to the water inlet of the heat exchanger 16B for heating. Therefore, the heating circuit is configured by connecting the heating heat exchanger 16B, the gas boiler 6, the heating terminal 7, and the pump 8.

  In the heating heat exchanger 16B, in the second state, between the refrigerant that has flowed in from the four-way switching valve 18 on the discharge side of the compressor 10 and the hot water for heating that has flowed in from the return connection portion 21b of the heating water pipe connection portion 21. The hot water for heating is heated by the heat exchange at, and the heated hot water flows out toward the forward connection portion 21a of the heating water pipe connection portion 21. In the heat pump heating device of the present embodiment, the outdoor unit 1 can heat either hot water for hot water supply or hot water for heating.

  The heat pump heating device 1 according to the present embodiment is connected to the use side device 4. The use side device 4 includes a hot water supply tank 5, a gas boiler 6, a heating terminal 7 such as a floor heating panel, and a pump 8. The gas boiler 6 has a heater 6 a and is connected to a heating terminal 7 and a hot water supply terminal 9. Therefore, the gas boiler 6 heats the hot water for hot water supplied from the hot water supply tank 5 before being supplied to the hot water supply terminal 9 or before the hot water for heating supplied from the outdoor unit 1 is supplied to the heating terminal 7. Can be heated. The pump 8 supplies the heating hot water flowing out from the heating terminal 7 to the heating heat exchanger 16 </ b> B, and circulates the heating hot water supplied to the heating terminal 7.

  Fig.3 (a) is a partial fracture | rupture figure explaining the internal structure of the heat pump part 2 and the water unit part 3 when the outdoor unit 1 is seen from the front, FIG.3 (b) shows the outdoor unit 1 from upper direction. FIG. 3C is a partial cutaway view illustrating the internal configuration of the water unit section 3 when viewed, and FIG. 3C is a hot water supply water pipe connection section 20 and a heating water pipe connection section when the outdoor unit 1 is viewed from the right side surface. FIG. As shown in FIG. 3A, the four-way switching valve 18 is disposed in the heat pump unit 2.

  FIG. 4A and FIG. 4B are a perspective view and a side view of a hot water supply heat exchanger 16A and a heating heat exchanger 16B, respectively. Inside the water unit 3 of the outdoor unit 1, the hot water supply heat exchanger 16A and the heating heat exchanger 16B are arranged in a vertically stacked state, as shown in FIG.

  The heating heat exchanger 16B has a heating water pipe 32 wound so as to be stacked in two stages in the vertical direction, and the hot water heat exchanger 16A is stacked in two stages in the vertical direction. It has the hot water supply water piping 31 wound like this. The hot water supply water pipe 31 and the heating water pipe 32 are wound in a substantially spiral shape at each stage in a plan view.

  A hot water supply return connection pipe 31a extending from the water supply pump 17 (return connection part 20b of the hot water supply water pipe connection part 20) is connected to the water inlet of the hot water supply heat exchanger 16A, and the water flow of the hot water supply heat exchanger 16A is Connected to the outlet is a hot water supply connection pipe 31 b extending from the forward connection part 20 a of the hot water supply water pipe connection part 20. A heating return communication pipe 32a extending from the return connection part 21b of the heating water pipe connection part 21 is connected to the water inlet of the heating heat exchanger 16B, and the water outlet of the heating heat exchanger 16B is connected to the water outlet of the heating heat exchanger 16B. The heating outgoing communication pipe 32b extending from the outgoing connecting part 21a of the heating water pipe connecting part 21 is connected.

  In the hot water supply heat exchanger 16A, a hot water supply refrigerant pipe 33 is spirally wound around the outer periphery of the hot water supply water pipe 31, and in the heating heat exchanger 16B, a heating refrigerant is provided around the outer periphery of the heating water pipe 32. The pipe 34 is wound spirally. The hot water supply heat exchanger 16A has a refrigerant inlet connected to a hot water supply connection pipe 33a extending from the discharge-side branching portion 18 of the compressor 10, and a hot water supply heat exchanger 16A has an electric outlet connected to the refrigerant outlet. A hot water supply connecting pipe 33b extending from the valve 12 is connected. Further, a heating communication pipe 34a extending from the branch portion 18 on the discharge side of the compressor 10 is connected to the refrigerant inlet of the heating heat exchanger 16B, and the refrigerant outlet of the heating heat exchanger 16B is connected to the refrigerant inlet of the heating heat exchanger 16B. The heating communication pipe 34b extending from the motor-operated valve 12 is connected.

  In the present embodiment, the hot water supply heat exchanger 16A is a portion in which the hot water supply refrigerant pipe 33 is spirally wound around the outer periphery of the hot water supply water pipe 31, and the heating heat exchanger 16B is the outer periphery of the heating water pipe 32. It is assumed that the heating refrigerant pipe 34 is spirally wound.

  The hot water supply water pipe 31 of the hot water supply heat exchanger 16A is wound so as to be stacked in two stages in the vertical direction, and is located at a lower stage from the hot water return communication pipe 31a. Hot water for hot water supply flows into the pipe, and hot water for hot water supply flows out from the pipe located at the upper stage to the hot water supply connecting pipe 31b. The heating water pipe 32 of the heating heat exchanger 16B is wound so as to be stacked in two stages in the vertical direction, and is in a stage disposed on the lower side from the heating return communication pipe 32a. The warm water for heating flows into the pipe, and the warm water for heating flows out from the pipe located at the upper stage to the forward communication pipe 32b for heating.

  The hot water supply water pipe 31 of the hot water supply heat exchanger 16 </ b> A configured as described above and the heating water pipe 32 of the heating heat exchanger 16 </ b> B are stacked inside the water unit 3. Specifically, the hot water supply heat exchanger 16A is wound so as to be stacked in two stages, and is configured such that hot water for hot water supply flows out from a pipe (outer pipe) in the uppermost stage. The heating heat exchanger 16B is stacked above the hot water supply heat exchanger 16A (for hot water supply so as to be close to the pipe (outer pipe) at the uppermost stage in the hot water supply water pipe 31). (It is laminated on the heat exchanger 16A.)

  A water communication pipe (a hot water supply return communication pipe 31a and a hot water supply forward communication pipe 31b) and a refrigerant communication pipe (a hot water supply communication pipe 33a and a hot water supply communication pipe 33b) are connected to the hot water supply heat exchanger 16A. The heating heat exchanger 16B is connected to a water communication pipe (heating return communication pipe 32a and heating outgoing communication pipe 32b) and a refrigerant communication pipe (heating communication pipe 34a and heating communication pipe 34b). Has been.

  As shown in FIG. 5, the control unit 56 of the heat pump heating device 1 is connected to the compressor 10, the electric valve 12, the outdoor fan 13, the water supply pump 17, and the controller 4 a of the usage side device 4. .

  The compressor 10 is controlled to an operation frequency based on the load of the hot water supply heat exchanger 16A or the heating heat exchanger 16B, and is controlled to an operation frequency equal to or higher than the minimum operation frequency except when stopped. The motor-operated valve 12 is not less than the minimum opening of the motor-operated valve 12 and is fully opened in a state where the compressor 10 is controlled at an operating frequency based on the load of the hot water supply heat exchanger 16A or the heating heat exchanger 16B. The following opening is controlled. The outdoor fan 13 is controlled to a rotational speed based on the load of the hot water supply heat exchanger 16A or the heating heat exchanger 16B.

  The controller 4a is a controller of the use side device 4, and an operation start instruction and an operation stop instruction for the heating terminal 7 and the hot water supply terminal 9 are performed. When an operation start instruction or an operation stop instruction is performed on the controller 4 a, the instruction is sent to the control unit 56.

  Hereinafter, the operation stop operation of the heat pump type heating apparatus 1 of the present embodiment will be described in detail. FIG. 6 is a flowchart of the operation stop operation of the heat pump type heating device.

  In step S1, the controller 56 determines whether or not there has been an operation start instruction based on whether an operation start instruction operation has been performed on the heating terminal 7 or the hot water supply terminal 9 with respect to the controller 4a. In step S1, when it is determined that there has been an operation start instruction, the process proceeds to step S2, and the heat pump heating device 1 starts the heating operation.

  In the heat pump heating device 1, when the heating operation is started, the operation frequency of the compressor 10 increases stepwise toward the operation frequency based on the load of the hot water supply heat exchanger 16A or the heating heat exchanger 16B. The opening degree of the electric valve 12 is controlled to an opening degree based on the load of the hot water supply heat exchanger 16A or the heating heat exchanger 16B. At this time, the rotational speed of the outdoor fan 13 is controlled to a rotational speed based on the load of the hot water supply heat exchanger 16A or the heating heat exchanger 16B.

  If it is not determined in step S1 that an operation start instruction has been issued, the determination in step S1 is repeated.

  In step S2, after starting the heating operation, in step S3, the control unit 56 issues an operation stop instruction based on whether the controller 4a has been operated to stop operation for the heating terminal 7 or the hot water supply terminal 9. Determine if there was. If it is determined in step S3 that an operation stop instruction has been issued, the process proceeds to step S4, and after the heating operation is started, it is determined whether or not a minimum operation time (eg, 2 min) has elapsed. If it is not determined in step S4 that the minimum operation time has elapsed, the process proceeds to step S5, and low load operation is started.

  The low load operation is an operation in which the load of the heat pump type heating device 1 is reduced, and the operation frequency of the compressor 10 is decreased to the lowest operation frequency lower than the operation frequency when the operation stop instruction is given, and the motor-operated valve 12 is operated. Is increased to a fully opened opening larger than the opening when the operation stop instruction is issued, and the outdoor fan 13 is stopped (the rotation speed of the outdoor fan 13 is the rotation when the operation stop instruction is issued). The number of revolutions is reduced to 0, which is smaller than the number). During the low load operation, the heat pump heating device 1 stops the hot water supply pump 17. Therefore, the flow of hot water in the hot water supply circuit is stopped during the low load operation of the heat pump heating device 1. Further, during the low load operation of the heat pump heating device 1, the user side device 4 stops the pump 8 by operating the controller 4 a to stop operation of the heating terminal 7 and the hot water supply terminal 9. ing. Therefore, at the time of low load operation of the heat pump heating device 1, the flow of hot water in the heating circuit is stopped in the use side device 4.

  In step S3, when it is not determined that the operation stop instruction has been issued, the determination in step S3 is repeated.

  When it is determined in step S4 that the minimum operation time has elapsed, the process proceeds to step S7, and the heat pump heating device 1 stops the heating operation.

  In step S5, after the low load operation is started, in step S6, it is determined whether the minimum operation time has elapsed after the heating operation is started. When it is determined in step S6 that the minimum operation time has elapsed, the process proceeds to step S7, and the heat pump heating device 1 stops the low load operation. If it is not determined in step S6 that the minimum operation time has elapsed, the determination in step S6 is repeated.

[Characteristics of the heat pump type heating apparatus of this embodiment]
The heat pump type heating device of the present embodiment has the following features.

  In the heat pump type heating apparatus 1 of the present invention, when there is an operation stop instruction until the minimum operation time elapses after starting the heating operation based on the operation start instruction, the compressor is operated until the minimum operation time elapses. 10 frequency is decreased to the lowest operating frequency lower than the frequency when the operation stop instruction is given, and the opening degree of the motor-operated valve 12 is increased to a fully open position larger than the opening degree when the operation stop instruction is issued, and The outdoor fan 13 is stopped (by reducing the rotational speed of the outdoor fan 13 to 0, which is smaller than the rotational speed when the operation stop instruction is issued, a low-load operation is performed. When the hot water heated by the heat pump unit cannot be exhausted in the hot water supply circuit in which the heat pump is disposed and the heating circuit in which the heat exchanger 16B for heating is disposed Even, it is possible to prevent the high-pressure abnormality occurs.

  In the heat pump type heating apparatus 1 of the present invention, when there is an operation stop instruction until the minimum operation time has elapsed after starting operation based on the operation start instruction, a high-pressure abnormality occurs due to low load operation. Since it can prevent, it can stop the flow of the warm water of the heating circuit by which the heat exchanger 16B for heating is arrange | positioned. Therefore, it is not necessary to add a bypass of the heating terminal 7 to the heating circuit.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not only by the above description of the embodiments but also by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  In the above-described embodiment, the low-load operation is an operation in which the operation frequency of the compressor 10 is decreased to the minimum operation frequency, the opening degree of the motor-operated valve 12 is increased to the fully open opening degree, and the outdoor fan 13 is stopped. However, in the low load operation, the operation frequency of the compressor 10 is decreased to an operation frequency lower than the operation frequency when the operation stop instruction is issued, and the opening degree of the motor-operated valve 12 is instructed to stop the operation. The effect of the present invention can be obtained in the case of an operation in which the opening is increased to an opening larger than the opening and the rotation speed of the outdoor fan 13 is decreased to a rotation speed smaller than the rotation speed when the operation stop instruction is issued. . In addition, the present invention performs the operation frequency reduction control for reducing the operation frequency of the compressor 10 to an operation frequency lower than the operation frequency when the operation stop instruction is given as the low load operation, and the opening degree of the motor operated valve 12. Is increased to an opening larger than the opening when the operation stop instruction is issued, and the rotation speed of the outdoor fan 13 is reduced to a rotation speed smaller than the rotation speed when the operation stop instruction is issued. It is also possible to perform rotation speed reduction control.

  By using the present invention, it is possible to prevent a high-pressure abnormality from occurring when there is a stop instruction from the start of operation until the minimum operation time has elapsed.

DESCRIPTION OF SYMBOLS 1 Heat pump type heating apparatus 10 Compressor 11 Outdoor heat exchanger (heat source side heat exchanger)
12 Motorized valve 13 Outdoor fan 16A Heat exchanger for hot water supply (use side heat exchanger)
16B Heat exchanger for heating (use side heat exchanger)
56 Control unit (control means)

Claims (2)

A refrigerant circuit provided with a compressor, a heat source side heat exchanger, an electric valve and a use side heat exchanger;
An outdoor fan for the heat source side heat exchanger;
Control means for controlling the compressor, the motor-operated valve and the outdoor fan based on an operation start instruction and an operation stop instruction;
The control means includes
After starting operation based on the operation start instruction, if there is an operation stop instruction until the minimum operation time elapses, until the minimum operation time elapses,
Perform frequency reduction control to reduce the frequency of the compressor from the frequency when the operation stop instruction is given,
Opening degree increase control that increases the opening degree of the motorized valve from the opening degree when the operation stop instruction is given, and rotation speed reduction control that decreases the rotation speed of the outdoor fan from the rotation speed when the operation stop instruction is given A heat pump-type heating device that performs at least one of them. The use side heat exchanger is capable of heating hot water flowing through a heating circuit to which a use side terminal is connected,
After starting operation based on the operation start instruction, when there is an operation stop instruction until the minimum operation time elapses, the flow of hot water in the heating circuit is stopped until the minimum operation time elapses. The heat pump heating apparatus according to claim 1.

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