Heat pump system

Abstract

A heat pump system (1) includes: a plurality of contactors (21) that control an AC voltage supplied from a commercial power supply (51); a main board (23) that receives the AC voltage for controlling the plurality of contactors (21); an operation unit (24) for which a target temperature is set; a temperature sensor (27) that measures the water temperature; and a heat source unit (22) that converts the AC voltage supplied from the commercial power supply (51) through some or all of the plurality of contactors (21) into a heat source.

Description

Heat pump system 【0001】 This disclosure relates to a heat pump system. 【0002】 A conventional heat pump system further warms the hot water heat-exchanged in an outdoor unit in a heat source unit and supplies it to a hot water supply tank, a heating device, or the like. An example of the heat source unit is a heater. The heat source unit is supplied with an AC voltage obtained by controlling, with a contactor, an AC voltage supplied from a commercial power source different from the commercial power source that supplies the outdoor unit with an AC voltage. 【0003】 The electric water heater disclosed in Patent Document 1 includes a can body incorporating a plurality of heaters, a temperature sensor that detects the temperature of the hot water supplied from the can body, and control means that controls the on and off of the heaters so that the temperature of the hot water detected by the temperature sensor becomes the set temperature. 【0004】 The electric boiler disclosed in Patent Document 2 includes a heating unit including a plurality of electric heaters, and means for controlling each of the plurality of electric heaters based on a signal value from a heat demand detection device attached to the boiler body and a set value of temperature or pressure. 【0005】 JP-A-2005-37097, Utility Model Laid-Open No. 4-90849 【0006】 There are only three driving patterns for a conventional heat source unit, and the prior art cannot perform driving control with a small output. 【0007】 This disclosure has been made in view of the above, and an object thereof is to obtain a heat pump system capable of finely sequence-controlling the output of a heat source unit. 【0008】 To solve the above-described problems and achieve the object, the heat pump system according to this disclosure includes a plurality of contactors that control an AC voltage supplied from a commercial power source, a main board that receives an AC voltage for controlling the plurality of contactors, an operation unit to which a target temperature is set, a temperature sensor that measures the water temperature, and a heat source unit that converts an AC voltage supplied from a commercial power source through some or all of the plurality of contactors into heat. 【0009】The heat pump system described herein has the effect of being able to precisely sequence-control the output of the heat source. 【0010】 Figure showing the configuration of the heat pump system according to Embodiment 1 Figure showing the drive pattern of the heat source section of the heat pump system according to Embodiment 1 Flowchart showing the procedure of operation performed by the heat pump system according to Embodiment 1 Figure showing the seven contactors and control relay circuit of the heat pump system according to Embodiment 1 Figure showing the seven contactors and seven elements of the heat source section of the heat pump system according to Embodiment 1 Figure showing the configuration of the heat pump system according to Embodiment 2 Figure showing the configuration of the heat pump system according to Embodiment 3 Figure showing the connection status between the power terminal block of the heat pump system according to Embodiment 3 and a three-phase four-wire commercial power supply Figure showing the connection status between the power terminal block of the heat pump system according to Embodiment 3 and a three-phase three-wire commercial power supply Figure showing the connection status between the power terminal block of the heat pump system according to Embodiment 3 and a single-phase two-wire commercial power supply Figure showing the configuration of the heat pump system according to Embodiment 4 Figure showing the relay drive pattern for driving the heat source section when the physical switch of the heat pump system according to Embodiment 4 is off and in balanced use Figure showing the relay drive pattern for driving the heat source section when the physical switch of the heat pump system according to Embodiment 4 is on and in unbalanced use 【0011】 The heat pump system according to the embodiment will be described in detail below with reference to the drawings. 【0012】 Embodiment 1. Figure 1 shows the configuration of a heat pump system 1 according to Embodiment 1. The heat pump system 1 includes an indoor unit 2, an outdoor unit 3, and a hot water tank / heating equipment 4. Figure 1 also shows the water circulation path in the heat pump system 1. The indoor unit 2 has seven contactors 21 that control the AC voltage supplied from the commercial power supply 51. Each of the seven contactors 21 is controlled to be either on or off. The commercial power supply 51 is also shown in Figure 1. 【0013】The indoor unit 2 further includes a heat source unit 22 that converts AC voltage supplied from the commercial power supply 51 through some or all of the seven contactors 21 into a heat source, a main board 23 that receives AC voltage for controlling the seven contactors 21, an operation unit 24 for setting the target temperature, and a water circulation circuit 25. An example of the heat source unit 22 is a heater. The operation unit 24 is a receiver that receives setting conditions and instructions. An example of the operation unit 24 is a remote controller. The outdoor unit 3 includes a power supply circuit 31, a control circuit 32, and a heat exchanger 33. 【0014】 Each of the seven contactors 21 is assigned one of the codes C1 to C7 without any overlap. The heat source unit 22 has three element groups 26A, 26B, and 26C. Contactors 21 assigned one of the codes C1 to C3 are connected to element group 26A. Contactors 21 assigned one of the codes C4 or C5 are connected to element group 26B. Contactors 21 assigned one of the codes C6 or C7 are connected to element group 26C. The heat pump system 1 controls each of the seven contactors 21 connected to one of the three element groups 26A, 26B, and 26C of the heat source unit 22 using the main board 23. 【0015】 Each of the seven contactors 21 has an on / off switch, which is a circuit that switches between outputting the three-phase four-wire AC voltage of 340-420V obtained from the commercial power supply 51 to the corresponding element group among the three element groups 26A, 26B, and 26C of the heat source unit 22, and not outputting the voltage. 【0016】The heat source unit 22 includes the three element groups 26A, 26B, and 26C described above, and a temperature sensor 27 for measuring water temperature. For example, the temperature sensor 27 has a thermistor. Element group 26A has two elements assigned the code P and one element assigned the code 4P. One end of each of the two elements is connected to one end of the one element. The other end of one of the two elements is connected to a contactor 21 assigned the code C1. The other end of the other element is connected to a contactor 21 assigned the code C2. The other end of the one element is connected to a contactor 21 assigned the code C3. 【0017】 Each of element group 26B and element group 26C has one element assigned the code 2P and one element assigned the code 4P. In each of element group 26B and element group 26C, one end of the element assigned the code 2P is connected to one end of the element assigned the code 4P. The other end of the element assigned the code 2P in element group 26B is connected to the contactor 21 assigned the code C4. The other end of the element assigned the code 4P in element group 26B is connected to the contactor 21 assigned the code C5. The other end of the element assigned the code 2P in element group 26C is connected to the contactor 21 assigned the code C6. The other end of the element assigned the code 4P in element group 26C is connected to the contactor 21 assigned the code C7. 【0018】As described above, the heat source unit 22, which has three element groups 26A, 26B, and 26C, includes two elements assigned the code P, two elements assigned the code 2P, and three elements assigned the code 4P. P represents the amount of electrical energy used when converting electrical energy into thermal energy. For example, if the amount of electrical energy in P is 0.5 kW, then the amount of electrical energy in 2P is 1 kW, the amount of electrical energy in 4P is 2 kW, and the maximum amount of electrical energy in the heat source unit 22 is 9 kW. 【0019】 In other words, the heat source unit 22 has seven contactors 21 and seven elements for raising the water temperature. Each of the seven contactors 21 is a circuit that switches between outputting a three-phase four-wire AC voltage obtained from the commercial power supply 51 to the connected element among the seven elements of the heat source unit 22, and not outputting it. The AC voltage is transmitted to the element connected to the ON contactor 21 among the seven contactors 21 of the seven elements of the heat source unit 22. 【0020】 The seven elements include two minimum-output elements, two elements with twice the minimum output, and three elements with four times the minimum output. The minimum-output elements are assigned the designation P, the elements with twice the minimum output are assigned the designation 2P, and the elements with four times the minimum output are assigned the designation 4P. Hereafter, elements assigned the designation P may be referred to as elements with power P, elements assigned the designation 2P may be referred to as elements with power 2P, and elements assigned the designation 4P may be referred to as elements with power 4P. 【0021】The main board 23 includes a power supply circuit 231, a control relay circuit 232, and a microcomputer 233. The power supply circuit 231 is a circuit that converts a single-phase two-wire AC voltage of 200-240V supplied from the commercial power supply 52 into a DC voltage. The commercial power supply 52 is also shown in Figure 1. The power supply circuit 31 of the outdoor unit 3 is also a circuit that converts a single-phase two-wire AC voltage of 200-240V supplied from the commercial power supply 52 into a DC voltage, similar to the power supply circuit 231. 【0022】 The control relay circuit 232 is a circuit that controls each of the seven contactors 21. The control relay circuit 232 has seven on / off switches, each corresponding to one of the seven contactors 21 without overlap. The control relay circuit 232 switches each of the seven contactors 21 between a state where it outputs AC voltage obtained from the commercial power supply 52 and a state where it does not output AC voltage. The AC voltage from the commercial power supply 52 is transmitted to the contactor 21 that corresponds to the on / off switch of the seven on / off switches in the control relay circuit 232. The on / off switch of the contactor 21 to which the AC voltage from the commercial power supply 52 has been transmitted turns on. In other words, the contactor 21 to which the AC voltage from the commercial power supply 52 has been transmitted turns on. 【0023】The microcomputer 233 is the main control unit that performs various controls. The microcomputer 233 reads temperature information from the temperature sensor 27 connected inside the water circulation circuit 25 and outputs an ON command to the control relay circuit 232 to drive the optimal element among the seven elements in order to bring the water temperature indicated by the temperature information to the target temperature. The ON / OFF switch of the control relay circuit 232 corresponding to the ON command is turned ON, the ON / OFF switch of the contactor 21 corresponding to that ON / OFF switch is turned ON, and the AC voltage from the commercial power supply 51 is transmitted to the optimal element among the seven elements of the heat source unit 22. The target temperature is the target temperature set in the operation unit 24. The microcomputer 233 is programmed with a control sequence to control the ON and OFF states of each of the seven contactors 21 in order to bring the water temperature indicated by the temperature information obtained from the temperature sensor 27 to the target temperature set in the operation unit 24. 【0024】 The control unit 24 sets the target water temperature and operating status of the hot water tank / heating equipment 4 of the heat pump system 1 and sends a command to the microcomputer 233. 【0025】 The water circulation circuit 25 is connected to the outdoor unit 3 and the hot water tank / heating equipment 4. The water undergoes heat exchange in the heat exchanger 33 of the outdoor unit 3, is further heated in the heat source unit 22 of the indoor unit 2, and then reaches the hot water tank / heating equipment 4. After passing through the hot water tank / heating equipment 4, the water passes through the indoor unit 2 again and reaches the heat exchanger 33 of the outdoor unit 3, where it undergoes heat exchange once more, thus completing the circulation. 【0026】 The control circuit 32 of the outdoor unit 3 is a circuit that controls the heat exchanger 33 using a DC voltage supplied from the power supply circuit 31. 【0027】Next, the operation of the heat pump system 1 will be described. The main board 23 is powered by a commercial power supply 52, and the power supply circuit 231 converts the AC voltage to a DC voltage. The microcomputer 233 transmits a signal to the control relay circuit 232 to control the seven contactors 21. This signal closes the on / off switch of the control relay circuit 232 corresponding to the contactor 21 connected to the target element among the seven elements of the heat source unit 22. The contactor 21 connected to the target element is one of the seven contactors 21. When the on / off switch of the control relay circuit 232 is closed, the AC voltage from the commercial power supply 52 is supplied to the coil portion of the contactor 21 connected to the target element, the on / off switch of the contactor 21 is closed, and the AC voltage from the commercial power supply 52 is supplied to the target element. 【0028】 For example, if the element assigned the code P among the seven elements of the heat source unit 22 has an energy output of 0.5 kW, the element assigned the code 2P has an energy output of 1 kW, and the element assigned the code 4P has an energy output of 2 kW, the heat pump system 1 drives the seven elements in a drive pattern 201 to heat water with an energy output of up to 9 kW in steps of 0.5 kW, as shown in Figure 2. Figure 2 is a diagram showing the drive pattern 201 of the heat source unit 22 of the heat pump system 1 according to Embodiment 1. Figure 2 shows the relationship between the amount of power consumed and the on and off states of each of the seven contactors 21. 【0029】 Figure 3 is a flowchart showing the operation procedure of the heat pump system 1 according to Embodiment 1. The heat source unit 22 is driven in stages according to the flowchart shown in Figure 3. First, a target temperature is set in the operation unit 24 (S1), and the heat pump system 1 starts operation. The microcomputer 233 reads the temperature information of the water circulation circuit 25 from the temperature sensor 27 (S2), and the heat exchanger 33 of the outdoor unit 3 is driven to heat the water so that the temperature indicated by the temperature information reaches the target temperature. 【0030】The microcomputer 233 determines whether the temperature indicated by the temperature information it has read has reached the set target temperature within a certain period of time (S3). If the microcomputer 233 determines that the temperature indicated by the temperature information has reached the target temperature (Yes in S3), the operation of the heat pump system 1 ends. If the microcomputer 233 determines that the temperature indicated by the temperature information has not reached the target temperature (No in S3), it drives the heat exchanger 33 to heat the water (S4). 【0031】 The operation of step S4 will be further explained below. Figure 4 shows the seven contactors 21 and control relay circuit 232 of the heat pump system 1 according to Embodiment 1. In Figure 4, each of the seven contactors 21 is assigned one of the symbols C1 to C7. Figure 5 shows the seven contactors 21 of the heat pump system 1 according to Embodiment 1 and the seven elements of the heat source unit 22. In Figure 5, each of the seven contactors 21 is assigned one of the symbols C1 to C7, and each of the seven elements of the heat source unit 22 is assigned one of the symbols P, 2P, and 4P. 【0032】 Based on the drive pattern 201 shown in Figure 2, the microcomputer 233 closes the on / off switches of the control relay circuit 232 corresponding to the contactor 21 corresponding to one or more of the seven elements. More specifically, based on the drive pattern 201, the microcomputer 233 closes the multiple on / off switches of the control relay circuit 232 in stages. As a result, the microcomputer 233 supplies power from the commercial power supply 51 to one or more of the seven elements of the heat source unit 22 to heat the water. 【0033】After performing the operation in step S4, the microcomputer 233 reads the temperature information of the water circulation circuit 25 from the temperature sensor 27 (S5) and determines whether the temperature indicated by the temperature information has reached the set target temperature (S6). If the microcomputer 233 determines that the temperature indicated by the temperature information has reached the target temperature (Yes in S6), the heat pump system 1 maintains the temperature by limiting the capacity of the heat exchanger 33 (S7). After the operation in step S7 is performed, the operation of the heat pump system 1 ends. 【0034】 If the microcomputer 233 determines that the temperature indicated by the temperature information has not reached the target temperature (No in S6), the on / off switches of the seven contactors 21 are turned on in stages according to the drive pattern 201 shown in Figure 2, for example, so that the heat source unit 22 is driven in stages and the water is heated (S8). This temperature is the temperature of the water to be heated. After the operation in step S8 is performed, the microcomputer 233 reads the temperature information of the water circulation circuit 25 from the temperature sensor 27 (S9) and determines whether the temperature indicated by the temperature information has reached the set target temperature (S10). 【0035】 If the microcomputer 233 determines that the temperature indicated by the temperature information has not reached the target temperature (No in S10), the operation in step S8 is performed. If the microcomputer 233 determines that the temperature indicated by the temperature information has reached the target temperature (Yes in S10), the heat pump system 1 maintains the temperature by limiting the capacity of the heat exchanger 33 and the heat source unit 22 (S11). This temperature is the temperature of the water to be heated. After the operation in step S11 is performed, the operation of the heat pump system 1 ends. 【0036】When the difference between the current temperature and the target temperature of the water circulation circuit 25 is relatively large, the heat pump system 1 heats the water with a relatively large driving capacity, or with a combination of a relatively large driving capacity and a relatively small driving capacity. When the difference becomes relatively small, the heat pump system 1 heats the water with a relatively small driving capacity. As a result, when the temperature of the water circulation circuit 25 is about to reach the target temperature, the heat pump system 1 uses the control circuit 32 to suppress the capacity of the heat exchanger 33 so that the temperature does not exceed the target temperature, and also controls the on / off switches of each of the seven contactors 21 in accordance with the driving pattern 201 to suppress the capacity of the heat source unit 22 and maintain the temperature inside the water circulation circuit 25. 【0037】 As described above, each of the seven contactors 21 connected to the commercial power supply 51 is connected to one of the seven elements of the heat source unit 22 without overlap, and the main board 23 controls each of the seven contactors 21. As a result, the heat pump system 1 can heat water with multi-stage control of up to 18 steps, compared to the conventional 3 steps. In other words, the heat pump system 1 can appropriately adjust the temperature of the hot water tank / heating equipment 4. 【0038】 Furthermore, since the heat source unit 22 has two elements with power P, two elements with power 2P, and three elements with power 4P, the heat pump system 1 can finely control the output of the heat source unit 22. Power P is the power for the steps that the user wants to set when performing the control. In other words, the heat pump system 1 can finely sequence control the output of the heat source unit 22. In addition, the heat pump system 1 can slow down the deterioration of each on / off switch of the seven contactors 21. 【0039】 Note that the number of contactors 21 is not limited to seven. There may be multiple contactors 21. 【0040】Embodiment 2. The heat pump system 1 according to Embodiment 1 can finely control the output of the heat source unit 22 by applying a three-phase four-wire AC voltage from a Y power supply to some or all of the seven elements of the heat source unit 22 using seven contactors 21. The heat pump system 1A according to Embodiment 2 has seven board-mounted relay components 28 instead of the seven contactors 21 of the heat pump system 1, as shown in Figure 6. Figure 6 is a diagram showing the configuration of the heat pump system 1A according to Embodiment 2. 【0041】 The main differences between the heat pump system 1A according to Embodiment 2 and the heat pump system 1 according to Embodiment 1 are that in the heat pump system 1A, the seven contactors 21 in the heat pump system 1 are replaced with seven board-mounted relay components 28, and the heat pump system 1A further includes a relay board 29 and a power terminal block 30. In Embodiment 2, the indoor unit 2 of Embodiment 1 is replaced with indoor unit 2A, and the main board 23 of Embodiment 1 is replaced with main board 23A. The main board 23A does not have a control relay circuit 232. Embodiment 2 will mainly describe the differences from Embodiment 1. 【0042】Each of the seven board-mounted relay components 28 is assigned one of the codes X1 to X7 without any overlap. The board-mounted relay component 28 assigned code X1 is connected to one of the two elements of the element group 26A of the heat source unit 22 that are assigned code P. The board-mounted relay component 28 assigned code X2 is connected to the other of the two elements of the element group 26A of the heat source unit 22 that are assigned code P. The board-mounted relay component 28 assigned code X3 is connected to the element of the element group 26A of the heat source unit 22 that is assigned code 4P. The board-mounted relay component 28 assigned code X4 is connected to the element of the element group 26B of the heat source unit 22 that is assigned code 2P. The board-mounted relay component 28 assigned code X5 is connected to the element of the element group 26B of the heat source unit 22 that is assigned code 4P. The board-mounted relay component 28 assigned the code X6 is connected to the element assigned the code 2P of the element group 26C of the heat source unit 22. The board-mounted relay component 28 assigned the code X7 is connected to the element assigned the code 4P of the element group 26C of the heat source unit 22. 【0043】The relay board 29 is equipped with seven board-mounted relay components 28, a sub-microcomputer 41, and a power supply circuit 42. In Embodiment 2, the microcomputer 233 of Embodiment 1 is replaced by a main microcomputer 43. The power supply terminal block 30 connects the commercial power supply 51 to each of the seven board-mounted relay components 28, and also connects the commercial power supply 51 to each of the seven elements of the heat source unit 22. As shown in FIG. 6, the power supply terminal block 30 has a first pin 301, a second pin 302, a third pin 303, and a fourth pin 304. The first pin 301 is connected to the board-mounted relay component 28 to which any one of the symbols X1 to X3 is assigned. The second pin 302 is connected to the board-mounted relay component 28 to which the symbols X4 and X5 are assigned. The third pin 303 is connected to the board-mounted relay component 28 to which the symbols X6 and X7 are assigned. The fourth pin 304 is connected to the seven elements of the heat source unit 22. 【0044】 The relay board 29 is powered from a commercial power supply 52. The power supply circuit 42 converts the AC voltage supplied from the commercial power supply 52 into a DC voltage. The main microcomputer 43 uses the temperature sensor 27 to read the temperature of the water flowing through the water circulation circuit 25, and based on the read temperature, sends a drive command for the heat source unit 22 required to reach the target temperature set by the operation unit 24 to the sub-microcomputer 41. The sub-microcomputer 41 that has received the drive command sends a signal to the coil side of the board-mounted relay component 28 that is connected to the target element among the seven elements of the heat source unit 22 out of the seven board-mounted relay components 28. As a result, the switch of the board-mounted relay component 28 connected to the target element closes, and power from the commercial power supply 51 is supplied to the target element, driving the heat source unit 22 to heat the water. 【0045】As described above, the heat pump system 1A according to the second embodiment controls the heat source unit 22 using the relay board 29 on which seven board-mounted relay components 28 are mounted. In each of the seven contacts 21 of the heat pump system 1 according to the first embodiment, the switching sound of the on-off switch is relatively large, and there is concern that switching noise of each on-off switch of the seven contacts 21 may occur in response to making the output of the heat source unit 22 finer. Since the heat pump system 1A has seven board-mounted relay components 28 instead of the seven contacts 21, it is possible to suppress the switch switching noise. 【0046】 Note that the number of the board-mounted relay components 28 is not limited to seven. The number of the board-mounted relay components 28 is plural. 【0047】 Embodiment 3. The heat pump system 1 according to the first embodiment and the heat pump system 1A according to the second embodiment apply a three-phase four-wire AC voltage of the Y power supply to some or all of the seven elements of the heat source unit 22 using the seven contacts 21 or the seven board-mounted relay components 28, whereby the output of the heat source unit 22 can be finely controlled. As shown in FIG. 7, the heat pump system 1B according to the third embodiment has a power supply terminal block 60 instead of the power supply terminal block 30 of the heat pump system 1A. FIG. 7 is a diagram showing the configuration of the heat pump system 1B according to the third embodiment. 【0048】 The main difference between the heat pump system 1B according to the third embodiment and the heat pump system 1A according to the second embodiment is that the power supply terminal block 30 of the heat pump system 1A is replaced with the power supply terminal block 60 in the heat pump system 1B. In the third embodiment, the indoor unit 2A of the second embodiment is replaced with the indoor unit 2B. In the third embodiment, the differences from the second embodiment will be mainly described. 【0049】The power terminal block 30 in the heat pump system 1A according to Embodiment 2 is a 4-pole power terminal block for three-phase four-wire systems, whereas the power terminal block 60 in the heat pump system 1B according to Embodiment 3 is a 6-pole power terminal block. The power terminal block 60 has six pins: a first pin 601, a second pin 602, a third pin 603, a fourth pin 604, a fifth pin 605, and a sixth pin 606. The reason the heat pump system 1B has a 6-pole power terminal block 60 is to accommodate the Y power supply (340-420V three-phase four-wire AC power supply), the T power supply (200-240V three-phase three-wire AC power supply), and the V power supply (200-240V single-phase two-wire AC power supply). 【0050】 Figure 8 shows the connection between the power terminal block 60 of the heat pump system 1B according to Embodiment 3 and a three-phase four-wire commercial power supply 511. Figure 9 shows the connection between the power terminal block 60 of the heat pump system 1B according to Embodiment 3 and a three-phase three-wire commercial power supply 512. Figure 10 shows the connection between the power terminal block 60 of the heat pump system 1B according to Embodiment 3 and a single-phase two-wire commercial power supply 513. 【0051】 As shown in Figure 8, when a three-phase four-wire commercial power supply 511 is used, L1 of the three-phase four-wire commercial power supply 511 is connected to the first pin 601 of the power terminal block 60, L2 of the three-phase four-wire commercial power supply 511 is connected to the second pin 602 of the power terminal block 60, L3 of the three-phase four-wire commercial power supply 511 is connected to the third pin 603 of the power terminal block 60, and N of the three-phase four-wire commercial power supply 511 is connected to the fourth pin 604 of the power terminal block 60. The fourth pin 604 and the fifth pin 605 are connected by a shorting wire 71. The fifth pin 605 and the sixth pin 606 are connected by a shorting wire 72. 【0052】As shown in Figure 9, when a three-phase three-wire commercial power supply 512 is used, L1 of the three-phase three-wire commercial power supply 512 is connected to the first pin 601 of the power terminal block 60, L2 of the three-phase three-wire commercial power supply 512 is connected to the second pin 602 of the power terminal block 60, and L3 of the three-phase three-wire commercial power supply 512 is connected to the third pin 603 of the power terminal block 60. The first pin 601 and the fourth pin 604 are connected by a shorting wire 73, the second pin 602 and the fifth pin 605 are connected by a shorting wire 74, and the third pin 603 and the sixth pin 606 are connected by a shorting wire 75. 【0053】 As shown in Figure 10, when a single-phase two-wire commercial power supply 513 is used, the inductor (L) of the single-phase two-wire commercial power supply 513 is connected to the first pin 601 of the power terminal block 60, and the non-current (N) of the single-phase two-wire commercial power supply 513 is connected to the fourth pin 604 of the power terminal block 60. The first pin 601 and the second pin 602 are connected by a shorting wire 76, the second pin 602 and the third pin 603 are connected by a shorting wire 77, the fourth pin 604 and the fifth pin 605 are connected by a shorting wire 78, and the fifth pin 605 and the sixth pin 606 are connected by a shorting wire 79. 【0054】 As described above, the heat pump system 1B according to Embodiment 3 has a power terminal block 60 which is a 6-pin power terminal block. The power terminal block 60 has six pins: a first pin 601, a second pin 602, a third pin 603, a fourth pin 604, a fifth pin 605, and a sixth pin 606. The power terminal block 60 further has short-circuit wires 71 to 79 which can be changed in accordance with the commercial power supply system 51. Therefore, the heat pump system 1B can drive the heat source unit 22 in accordance with multiple power supply systems by changing the connection of the short-circuit wires in accordance with the power supply system. In other words, although power supply systems may differ from country to country or region to region, the heat pump system 1B can be used in a relatively large number of countries and regions. 【0055】Embodiment 4. The heat pump systems 1, 1A, and 1B according to Embodiments 1 to 3 can precisely sequence control the output of the heat source unit 22. When performing multi-stage control of the output of the heat source unit 22, in a three-phase power supply such as a Y power supply or a T power supply, the load from the heat source unit 22 is not uniform to each phase in Steps 1 to 5, 7 to 11, and 13 to 17 shown in Figure 2, resulting in an imbalance in the voltage of each phase. In areas where this imbalance is unacceptable, the heat pump systems 1, 1A, and 1B according to Embodiments 1 to 3 cannot be used. Embodiment 4 describes a configuration that allows switching between balanced and unbalanced operation of the heat source unit 22. 【0056】 Figure 11 shows the configuration of the heat pump system 1C according to Embodiment 4. The heat pump system 1C has a relay board 81 instead of the relay board 29 that the heat pump system 1A according to Embodiment 2 has, and a power terminal block 60 instead of the power terminal block 30 that the heat pump system 1A has. The relay board 81 is equipped with seven board-mounted relay components 28, a sub-microcomputer 41, a power supply circuit 42, and a switch circuit 82. In Embodiment 4, the indoor unit 2A of Embodiment 2 is replaced with an indoor unit 2C. Embodiment 4 will mainly describe the differences from Embodiment 2. 【0057】 The switch circuit 82 outputs a signal to the sub-microcomputer 41. A physical switch 83 is mounted on the switch circuit 82. The switch circuit 82 switches between balanced and unbalanced drive of the heat source unit 22 depending on the on or off state of the physical switch 83 before power is applied. In balanced operation, by turning off the physical switch 83, the sub-microcomputer 41 receives a Lo signal from ground 85 through the pull-down resistor 84. In unbalanced operation, by turning on the physical switch 83, the DC voltage 86 conducts, and the sub-microcomputer 41 receives a Hi signal from the DC voltage 86. 【0058】When the physical switch 83 is off, the heat pump system 1C controls the output of the heat source unit 22 using the relay drive pattern 91 shown in Figure 12. Figure 12 shows the relay drive pattern 91 for driving the heat source unit 22 when the physical switch 83 is off and the system is in balanced operation, as shown in Embodiment 4. When the physical switch 83 is on, the heat pump system 1C controls the output of the heat source unit 22 using the relay drive pattern 92 shown in Figure 13. Figure 13 shows the relay drive pattern 92 for driving the heat source unit 22 when the physical switch 83 is on and the system is in unbalanced operation, as shown in Embodiment 4. In other words, Figure 13 shows the relay drive pattern 92 for driving the heat source unit 22 when the physical switch 83 is on and the system is in unbalanced operation, similar to Embodiments 1, 2, and 3. In this way, the heat pump system 1C can control the output of the heat source unit 22 in response to the on and off switching of the physical switch 83 implemented in the switch circuit 82. 【0059】 As described above, the heat pump system 1C according to embodiment 4 has a relay board 81 on which a switch circuit 82 is mounted, so that the drive of the heat source unit 22 can be easily switched between balanced use and unbalanced use. 【0060】 Specifically, when the commercial power supply 51 is a three-phase commercial power supply and the heat source unit 22 is driven by the three-phase commercial power supply, the relay board 81 has a switch circuit 82 that switches between a state in which the load on the three-phase commercial power supply is equalized and a state in which it is unbalanced. As a result, the heat pump system 1C can easily switch the drive of the heat source unit 22 between balanced and unbalanced use. 【0061】 The configurations shown in the above embodiments are examples only, and it is possible to combine them with other known technologies, combine different embodiments, and omit or modify parts of the configuration without departing from the gist of the invention. 【0062】1, 1A, 1B, 1C Heat pump system, 2, 2A, 2B, 2C Indoor unit, 3 Outdoor unit, 4 Hot water tank / heating equipment, etc., 21 Contactor, 22 Heat source unit, 23, 23A Main board, 24 Control unit, 25 Water circulation circuit, 26A, 26B, 26C Element group, 27 Temperature sensor, 28 Board-mounted relay component, 29, 81 Relay board, 30, 60 Power terminal block, 31, 42, 231 Power circuit, 32 Control circuit, 33 Heat exchanger, 41 Sub-microcomputer, 43 Main microcomputer, 51, 52 Commercial power supply, 71, 72, 73, 74, 75, 76, 77, 78, 79 Short-circuit wire, 82 Switch circuit, 83 Physical switch, 84 Pull-down resistor, 85 Ground, 86 DC voltage, 91, 92 Relay drive pattern, 201 Drive pattern, 232 Control relay circuit, 233 Microcomputer, 301, 601 First pin, 302, 602 Second pin, 303, 603 Third pin, 304, 604 Fourth pin, 511 Three-phase four-wire commercial power supply, 512 Three-phase three-wire commercial power supply, 513 Single-phase two-wire commercial power supply, 605 Fifth pin, 606 Sixth pin.

Claims

1. A heat pump system comprising: a plurality of contactors that control an AC voltage supplied from a commercial power source; a main board that receives the AC voltage for controlling the plurality of contactors; an operating unit for setting a target temperature; a temperature sensor for measuring water temperature; and a heat source unit that converts the AC voltage supplied from the commercial power source through some or all of the plurality of contactors into a heat source.

2. The heat pump system according to claim 1, wherein each of the plurality of contactors is controlled to be either on or off, the plurality of contactors is seven contactors, the heat source unit has seven elements corresponding to the seven contactors for raising the water temperature, and the seven elements include two minimum output elements, two elements with twice the output of the minimum output, and three elements with four times the output of the minimum output.

3. The heat pump system according to claim 2, wherein the main board has a microcomputer programmed with a control sequence for controlling the on and off states of each of the seven contactors in order to bring the water temperature, indicated by the temperature information obtained from the temperature sensor, to the target temperature set by the operation unit.

4. A heat pump system comprising: a plurality of board-mounted relay components for controlling AC voltage supplied from a commercial power source; a main board for receiving AC voltage to control the plurality of board-mounted relay components; an operating unit for setting a target temperature; a temperature sensor for measuring water temperature; a heat source unit for converting AC voltage supplied from the commercial power source through some or all of the plurality of board-mounted relay components into a heat source; a relay board on which the plurality of board-mounted relay components are mounted and which supplies and cuts off power from the commercial power source to the heat source unit; and a power terminal block for connecting the commercial power source to the relay board and the heat source unit.

5. The heat pump system according to claim 4, wherein each of the plurality of board-mounted relay components is controlled to be either on or off, the plurality of board-mounted relay components is seven board-mounted relay components, the heat source has seven elements corresponding to the seven board-mounted relay components for raising the water temperature, and the seven elements include two minimum output elements, two elements with twice the output of the minimum output, and three elements with four times the output of the minimum output.

6. The heat pump system according to claim 5, wherein the main board has a microcomputer programmed with a control sequence for controlling the on and off states of each of the seven board-mounted relay components in order to bring the water temperature, indicated by the temperature information obtained from the temperature sensor, to the target temperature set by the operation unit.

7. The heat pump system according to any one of claims 4 to 6, wherein the power terminal block has a plurality of pins and a plurality of shorting lines that can change the wiring in accordance with the commercial power supply system.

8. The heat pump system according to any one of claims 4 to 7, wherein the commercial power supply is a three-phase commercial power supply, the heat source unit is driven by the three-phase commercial power supply, and the relay board has a switch circuit that switches between a state in which the load on the three-phase commercial power supply is equal and a state in which it is uneven.

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