Air-conditioning / hot water supply device and control method thereof

Abstract

The present disclosure relates to an air-conditioning / hot water supply device. The air-conditioning / hot water supply device of the present disclosure comprises: an outdoor unit comprising a compressor; a water tank which heats stored water by using the heat of a refrigerant discharged from the compressor; a plurality of indoor units comprising indoor heat exchangers; and a refrigerant distributor which connects the outdoor unit and the plurality of indoor units. The outdoor unit comprises: an outdoor heat exchanger comprising a first outdoor heat exchanger and a third outdoor heat exchanger; a first switching valve which connects the compressor and the first outdoor heat exchanger; and a second switching valve which connects the compressor and the third outdoor heat exchanger.

Description

Air conditioner and water heater and its control method

[0001] The present disclosure relates to an air conditioning water heater, and more specifically, to an air conditioning water heater that simultaneously performs hot water supply and cooling / heating operations.

[0002] While it is common to install hot water supply and HVAC systems independently, situations may arise where they must be installed as a single system depending on the installation environment, user requirements, and other factors.

[0003] Due to differences in the usage methods of the indoor units and water heaters in the air conditioning system, the heating (condensation) and cooling (evaporation) loads differ from those of typical indoor air conditioning units. Consequently, the system cannot operate stably and repeatedly stops and starts, causing damage to the compressor and potentially weakening the system's reliability.

[0004] For example, since the user always keeps the hot water supply running, if water is not used for a long time, the condensation load disappears, causing the compressor to stop in an emergency due to a rise in high pressure in the system. Subsequently, when the compressor is operated again, there is no condensation load, so the compressor stops in an emergency again due to a rise in high pressure, which can cause a problem of repeated stopping and starting.

[0005] When installing a system that operates the hot water supply and HVAC systems as a single outdoor unit, stable combined operation control for hot water and HVAC is required.

[0006] Registered patent KR 10-2129078 B1 provides an air conditioning water heater that performs hot water supply operation with multiple indoor units. However, the above-mentioned problem still exists in the disclosed content.

[0007] The present disclosure aims to solve the aforementioned problems and other problems.

[0008] Another objective is to provide an air conditioning water heater that simultaneously performs hot water supply operation and simultaneous heating and cooling operation.

[0009] Another objective is to provide an air conditioning water heater that stably operates the compressor even when there is almost no load acting on the water tank and on the indoor unit.

[0010] To achieve the above objective, an air conditioning water heater according to an embodiment of the present disclosure comprises an outdoor unit including a compressor, a water tank that heats stored water using the heat of a refrigerant discharged from the compressor, a plurality of indoor units including an indoor heat exchanger, and a refrigerant distributor connecting the outdoor unit and the plurality of indoor units.

[0011] The above outdoor unit includes an outdoor heat exchanger comprising a first outdoor heat exchanger and a third outdoor heat exchanger, a first switching valve connecting the compressor and the first outdoor heat exchanger, and a second switching valve connecting the compressor and the third outdoor heat exchanger.

[0012] The above outdoor unit includes a second outdoor heat exchanger connected in parallel or in series with the first outdoor heat exchanger according to the direction of refrigerant flow.

[0013] The above outdoor unit includes a discharge pipe that sends refrigerant discharged from the compressor to the first switching valve, a suction pipe that sends refrigerant flowing from the first switching valve to the compressor, a first branch pipe connecting the discharge pipe and the second switching valve, and a second branch pipe connecting the second switching valve and the suction pipe.

[0014] The above outdoor unit is connected to the above refrigerant distributor by three refrigerant pipes. The above refrigerant distributor is connected to each of the above plurality of indoor units by two refrigerant pipes.

[0015] It includes a liquid pipe connecting the above outdoor heat exchanger and the above refrigerant distributor.

[0016] The above outdoor unit includes a first branch liquid pipe connecting the first outdoor heat exchanger and the liquid pipe, a second branch liquid pipe connecting the second outdoor heat exchanger and the liquid pipe, and a third branch liquid pipe connecting the third outdoor heat exchanger and the liquid pipe.

[0017] The above outdoor unit includes a first outdoor expansion valve disposed in the first branch liquid pipe, a second outdoor expansion valve disposed in the second branch liquid pipe, and a third outdoor expansion valve disposed in the third branch liquid pipe.

[0018] The above outdoor unit includes a first connecting pipe connecting the first outdoor heat exchanger and the first switching valve, a second connecting pipe connecting the second outdoor heat exchanger and the first connecting pipe, and a third connecting pipe connecting the third outdoor heat exchanger and the second switching valve.

[0019] A check valve is disposed in the second connecting pipe to block the flow of refrigerant flowing through the first connecting pipe into the second connecting pipe.

[0020] The above outdoor unit includes a variable pass pipe connecting the first branch pipe and the second connecting pipe, and a variable pass valve for opening and closing the variable pass pipe.

[0021] In the operating mode where the operation of all the above plurality of indoor units is stopped and the water in the water tank is heated, the first switching valve sends the refrigerant flowing from the first outdoor heat exchanger to the compressor.

[0022] In the operating mode where the operation of all the above-mentioned multiple indoor units is stopped and the water in the water tank is heated, the second switching valve sends the refrigerant flowing from the third outdoor heat exchanger to the compressor or sends the refrigerant flowing from the compressor to the third outdoor heat exchanger based on the operating conditions of the compressor.

[0023] The second switching valve sends the refrigerant flowing from the compressor to the third outdoor heat exchanger when the frequency of the compressor is below the set frequency.

[0024] The second switching valve sends the refrigerant flowing from the compressor to the third outdoor heat exchanger when the discharge pressure of the compressor is higher than the set pressure.

[0025] In an operating mode where more than half of the plurality of indoor units are operated as condensers and the water in the water tank is heated, the first switching valve sends the refrigerant flowing from the first outdoor heat exchanger to the compressor.

[0026] In an operating mode in which more than half of the plurality of indoor units are operated as condensers and the water in the water tank is heated, the second switching valve sends the refrigerant flowing from the third outdoor heat exchanger to the compressor or sends the refrigerant flowing from the compressor to the third outdoor heat exchanger based on outdoor temperature conditions.

[0027] The second switching valve sends the refrigerant flowing from the compressor to the third outdoor heat exchanger when the outdoor temperature is lower than the set temperature.

[0028] The control method of an air conditioning water heater of the present disclosure comprises the steps of: operating a first hot water dedicated mode in which the operation of all of a plurality of indoor units is stopped and a first switching valve sends refrigerant flowing from a first outdoor heat exchanger and a second outdoor heat exchanger to a compressor, and a second switching valve sends refrigerant flowing from a third outdoor heat exchanger to the compressor, so as to heat water in a water tank; and operating a second hot water dedicated mode in which the second switching valve is adjusted to allow refrigerant flowing from the compressor to flow to the third outdoor heat exchanger based on the operating conditions of the compressor.

[0029] The control method for the air conditioning water heater proceeds to the step of operating the second hot water dedicated mode when the frequency of the compressor is below the set frequency.

[0030] The control method for the air conditioning water heater proceeds to the step of operating the second hot water dedicated mode when the discharge pressure of the compressor is higher than the set pressure.

[0031] The control method for the air conditioning water heater proceeds by adjusting the second switching valve to operate the first hot water dedicated mode when at least one of the plurality of indoor units is operated after the second hot water dedicated mode has been executed.

[0032] After the above second hot water supply mode is executed, when the hot water supply and cooling temperature of the water tank exceeds the set temperature, the step of operating the above first hot water supply mode by adjusting the above second switching valve is performed.

[0033] Specific details of other embodiments are included in the detailed description and drawings.

[0034]

[0035] According to the air conditioner / water heater of the present disclosure, one or more of the following effects are provided.

[0036] First, there is an advantage in that it is possible to perform heating and cooling operations simultaneously with hot water supply operations through a refrigerant distributor connecting multiple indoor units and a water tank connecting them.

[0037] By connecting a third outdoor heat exchanger separately to the second outdoor heat exchanger, stable operation of the compressor can be maintained even when multiple indoor units are not operating and there is almost no load for heating the water tank.

[0038] Third, there is also the advantage of being able to perform defrosting and heating operations simultaneously by adjusting the connection method of the first, second, and third outdoor heat exchangers.

[0039] The effects of the present disclosure are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims.

[0040] FIG. 1 is a system diagram of an air conditioner / water heater according to one embodiment of the present disclosure.

[0041] FIG. 2 is a diagram illustrating the flow of refrigerant according to the first mode of the air conditioner / water heater of FIG. 1.

[0042] FIG. 3 is a diagram illustrating the flow of refrigerant according to the second mode of the air conditioner / water heater of FIG. 1.

[0043] Figure 4 is a diagram illustrating the flow of refrigerant according to the 3-1 mode of the air conditioner water heater of Figure 1.

[0044] Figure 5 is a diagram illustrating the flow of refrigerant according to the 3-2 mode of the air conditioner water heater of Figure 1.

[0045] Figure 6 is a diagram illustrating the flow of refrigerant according to the fourth mode of the air conditioner water heater of Figure 1.

[0046] Figure 7 is a diagram illustrating the flow of refrigerant according to the 5-1 mode of the air conditioner water heater of Figure 1.

[0047] FIG. 8 is a diagram illustrating the flow of refrigerant according to the 5-2 mode of the air conditioner water heater of FIG. 1.

[0048] FIG. 9 is a diagram illustrating the flow of refrigerant according to the 6th mode of the air conditioner / water heater of FIG. 1.

[0049] FIG. 10 is a flowchart relating to a control method for an air conditioner / water heater according to the present disclosure.

[0050] The advantages and features of the present disclosure and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments below but may be implemented in various different forms. The embodiments provided are merely to make the present disclosure complete and to fully inform those skilled in the art of the scope of the disclosure. The present disclosure is defined only by the scope of the claims. Throughout the specification, like reference numerals refer to like components.

[0051] Hereinafter, the present disclosure will be described with reference to the drawings for explaining an air conditioning water heater according to embodiments of the present disclosure.

[0052] With reference to FIG. 1, the configuration of the air conditioning water heater of the present disclosure will be explained.

[0053] The air conditioner / water heater of the present disclosure can compress a refrigerant to control the indoor temperature or heat a water tank. The air conditioner / water heater of the present disclosure may include at least one outdoor unit (20) and a plurality of indoor units (10a, 10b, 10c).

[0054] Here, each of the plurality of indoor units (10a, 10b, 10c) includes an indoor heat exchanger and an indoor fan. Accordingly, the meaning that an indoor unit is used as an evaporator or a condenser below may mean that the indoor heat exchanger of the indoor unit is used as an evaporator or a condenser.

[0055] The air conditioner / water heater of the present disclosure includes a hydrokit (16) connecting an outdoor unit (20) and a water tank (14). The hydrokit (16) may be a device that exchanges heat between a heat medium and a refrigerant. Accordingly, the heat medium heated in the hydrokit (16) may flow into the water tank (14) to heat the water inside the water tank (14).

[0056] The air conditioner / water heater of the present disclosure includes a refrigerant distributor (12) connecting an outdoor unit (20) and a plurality of indoor units (10a, 10b, 10c).

[0057] The outdoor unit (20) is connected to the refrigerant distributor (12) and three refrigerant pipes (34, 36, 38).

[0058] The refrigerant distributor (23) is connected to each of the multiple indoor units (10a, 10b, 10c) by two refrigerant pipes.

[0059] The outdoor unit (20) includes a compressor (22) that compresses the refrigerant. The outdoor unit (20) includes a plurality of outdoor heat exchangers (30a, 30b, 30c). The outdoor unit (20) includes a plurality of outdoor expansion valves (32a, 32b, 32c) connected to the plurality of outdoor heat exchangers (30a, 30b, 30c).

[0060] The outdoor unit (20) includes an accumulator (66) that separates the refrigerant flowing into the compressor (22).

[0061] The outdoor unit (20) includes a first switching valve (24) that sends the refrigerant discharged from the compressor (22) to the outdoor heat exchanger (30a, 30b, 30c) or sends the refrigerant flowing from the outdoor heat exchanger (30a, 30b, 30c) to the compressor (22).

[0062] The outdoor unit (20) includes an auxiliary valve (28) positioned between pipes through which refrigerant discharged from the compressor (22) and expelled outside the outdoor unit (20) flows.

[0063] The outdoor unit (20) includes a second switching valve (26) that sends a portion of the refrigerant discharged from the compressor (22) that is branched and flows to any one of a plurality of outdoor heat exchangers (30a, 30b, 30c), or sends the refrigerant flowing from any one of the plurality of outdoor heat exchangers (30a, 30b, 30c) to the compressor (22).

[0064] The outdoor unit (20) includes a first outdoor heat exchanger (30a) and a second outdoor heat exchanger (30b) connected in series or in parallel with the first outdoor heat exchanger (30a).

[0065] When the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) are used as evaporators, it can be considered as a heating mode. When the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) are used as condensers, it can be considered as a cooling mode.

[0066] In heating mode, the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) are connected in parallel. In cooling mode, the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) are connected in series.

[0067] That is, in heating mode, refrigerant flows to the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b), respectively. In cooling mode, refrigerant that has passed through the first outdoor heat exchanger (30a) flows to the second outdoor heat exchanger (30b).

[0068] The outdoor unit (20) includes a third outdoor heat exchanger (30c) through which a branched portion of the refrigerant flowing from the compressor (22) flows. The third outdoor heat exchanger (30c) is connected separately from the first outdoor heat exchanger (30a) or the second outdoor heat exchanger (30b).

[0069] The third outdoor heat exchanger (30c) is connected to the second switching valve (26).

[0070] The outdoor unit (20) includes a first outdoor expansion valve (32a) connected to a first outdoor heat exchanger (30a) and a second outdoor expansion valve (32b) connected to a second outdoor heat exchanger (30b).

[0071] The outdoor unit (20) includes a third outdoor expansion valve (32c) connected to a third outdoor heat exchanger (30c).

[0072] The first switching valve (24) can send the refrigerant discharged from the compressor (22) to the first outdoor heat exchanger (30a). The first switching valve (24) can send the refrigerant flowing from the first outdoor heat exchanger (30a) to the compressor (22).

[0073] The second switching valve (26) can send the refrigerant discharged from the compressor (22) to the third outdoor heat exchanger (30c). The second switching valve (26) can send the refrigerant flowing from the third outdoor heat exchanger (30c) to the compressor (22).

[0074] The air conditioner includes a high-pressure refrigerant pipe (34) through which high-pressure cooling discharged from the compressor (22) flows. The air conditioner includes a low-pressure refrigerant pipe (36) through which refrigerant flowing into the compressor (22) flows.

[0075] The air conditioner / water heater includes a liquid pipe (38) extending from an outdoor heat exchanger (30a, 30b, 30c) to a plurality of indoor units (10a, 10b, 10c).

[0076] High-pressure refrigerant pipe (34), low-pressure refrigerant pipe (36), and liquid pipe (38) may be extended from the outdoor unit (20). The high-pressure refrigerant pipe (34), low-pressure refrigerant pipe (36), and liquid pipe (38) extending from the outdoor unit (20) may be connected to a hydrokit (16) connected to a water tank (14).

[0077] The high-pressure refrigerant pipe (34), low-pressure refrigerant pipe (36), and liquid pipe (38) extending from the outdoor unit (20) can be connected to a refrigerant distributor (12) connected to a plurality of indoor units (10a, 10b, 10c).

[0078] The outdoor unit (20) includes a first branch liquid pipe (40) connected to a first outdoor heat exchanger (30a) and a second branch liquid pipe (42) connected to a second outdoor heat exchanger (30b). The outdoor unit (20) includes a third branch liquid pipe (44) connected to a third outdoor heat exchanger (30c).

[0079] Each of the first branch liquid tube (40), the second branch liquid tube (42), and the third branch liquid tube (44) is connected to the liquid tube (38).

[0080] A first outdoor expansion valve (32a) is placed in the first branch liquid pipe (40). A second outdoor expansion valve (32b) is placed in the second branch liquid pipe (42). A third outdoor expansion valve (32c) is placed in the third branch liquid pipe (44).

[0081] The outdoor unit (20) includes a first connecting pipe (46) connected to a first outdoor heat exchanger (30a). The outdoor unit (20) includes a second connecting pipe (48) connected to a second outdoor heat exchanger (30b). The outdoor unit (20) includes a third connecting pipe (50) connected to a third outdoor heat exchanger (30c).

[0082] The first connecting pipe (46) is connected to the first switching valve (24). The second connecting pipe (48) is connected to the first connecting pipe (46). A check valve (56) is provided in the second connecting pipe (48). The check valve (56) allows the refrigerant flowing through the second connecting pipe (48) to flow into the first connecting pipe (46). The check valve (56) blocks the refrigerant flowing through the first connecting pipe (46) from flowing into the second connecting pipe (48).

[0083] The outdoor unit (20) includes a variable pass pipe (52) connecting the first branch pipe (40) and the second connecting pipe (48), and a variable pass valve (54) for opening and closing the variable pass pipe (52).

[0084] When the variable pass valve (54) opens the variable pass pipe (52), the refrigerant flowing through the first branch pipe (40) can flow into the second connecting pipe (48).

[0085] The third connecting pipe (50) is connected to the second switching valve (26).

[0086] The outdoor unit (20) includes a discharge pipe (58) that sends the refrigerant discharged from the compressor (22) to the first switching valve (24), and a suction pipe (60) that sends the refrigerant flowing from the first switching valve (24) to the compressor (22).

[0087] An accumulator (66) may be placed in the suction tube (60).

[0088] The outdoor unit (20) includes a first branch pipe (62) that branches off from the discharge pipe (58) and connects to the second switching valve (26), and a second branch pipe (64) that connects from the second switching valve (26) to the suction pipe (60).

[0089] Referring to Fig. 2, the flow of the refrigerant in the first mode is explained.

[0090] The first mode may be a cooling operation mode in which all of the multiple indoor units (10a, 10b, 10c) are used as evaporators. Additionally, the first mode may be a hot water supply mode that heats the water tank. That is, the first mode is an operation mode in which the cooling operation mode and the hot water supply mode are applied simultaneously.

[0091] In the first mode, multiple indoor units are all used as evaporators. In the first mode, the water tank (14) is heated.

[0092] In the first mode, the first outdoor heat exchanger (30a), the second outdoor heat exchanger (30b), and the third outdoor heat exchanger (30c) are used as condensers.

[0093] In the first mode, the first switching valve (24) sends the refrigerant discharged from the compressor (22) to the first outdoor heat exchanger (30a). In the first mode, the second switching valve (26) sends the refrigerant discharged from the compressor (22) to the third outdoor heat exchanger (30c).

[0094] In the first mode, the variable pass valve (54) is opened. In the first mode, the first outdoor expansion valve (32a) is closed. In the first mode, the second outdoor expansion valve (32b) and the third outdoor expansion valve (32c) are opened.

[0095] Accordingly, a portion of the refrigerant discharged from the compressor (22) flows sequentially through the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) to flow outside the outdoor unit (20). Additionally, another portion of the refrigerant discharged from the compressor (22) flows through the third outdoor heat exchanger (30c) to flow outside the outdoor unit (20).

[0096] Another portion of the refrigerant discharged from the compressor (22) flows outside the outdoor unit (20) through the high-pressure refrigerant pipe (34).

[0097] The refrigerant flowing outside the outdoor unit (20) through the high-pressure refrigerant pipe (34) can flow into the water tank (14) through the hydro kit (16).

[0098] The refrigerant flowing outside the outdoor unit (20) through the liquid pipe (38) flows through the refrigerant distributor (12) to each of the multiple indoor units (10a, 10b, 10c).

[0099] The refrigerant that has been heat-exchanged in each of the multiple indoor units (10a, 10b, 10c) can flow to the compressor (22) of the outdoor unit (20) through the low-pressure refrigerant pipe (36). Additionally, the refrigerant flowing to the hydrokit (16) via the water tank (14) can flow through the liquid pipe (38).

[0100] Referring to Fig. 3, the flow of the refrigerant in the second mode is explained.

[0101] The second mode may be a heating operation mode in which all of the multiple indoor units (10a, 10b, 10c) are used as condensers. Additionally, the second mode may be a hot water supply mode that heats the water tank. That is, the second mode is an operation mode in which the heating operation mode and the hot water supply mode are applied simultaneously.

[0102] In the second mode, multiple indoor units (10a, 10b, 10c) are all used as condensers. In the second mode, the water tank (14) is heated.

[0103] In the second mode, the first outdoor heat exchanger (30a), the second outdoor heat exchanger (30b), and the third outdoor heat exchanger (30c) are used as evaporators.

[0104] In the second mode, the first switching valve (24) sends the refrigerant flowing from the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) to the compressor (22). In the second mode, the second switching valve (26) sends the refrigerant flowing from the third outdoor heat exchanger (30c) to the compressor (22).

[0105] In the second mode, the variable pass valve (54) is closed. In the second mode, the first outdoor expansion valve (32a), the second outdoor expansion valve (32b), and the third outdoor expansion valve (32c) are all opened. In the second mode, each of the first outdoor expansion valve (32a), the second outdoor expansion valve (32b), and the third outdoor expansion valve (32c) expands the flowing refrigerant.

[0106] Accordingly, the refrigerant discharged from the compressor (22) flows outside the outdoor unit (20) through the high-pressure refrigerant pipe (34).

[0107] A portion of the refrigerant flowing outside the outdoor unit (20) through the high-pressure refrigerant pipe (34) can flow into the water tank (14) through the hydrokit (16).

[0108] Another portion of the refrigerant flowing outside the outdoor unit (20) through the high-pressure refrigerant pipe (34) flows to each of the multiple indoor units (10a, 10b, 10c) through the refrigerant distributor (12).

[0109] The refrigerant that has been heat-exchanged in each of the multiple indoor units (10a, 10b, 10c) flows to the outdoor unit (20) through the liquid pipe (38). The refrigerant that flows through the water tank (14) to the hydrokit (16) flows to the outdoor unit (20) through the liquid pipe (38).

[0110] The refrigerant flowing to the outdoor unit (20) through the liquid pipe (38) can flow to the first outdoor heat exchanger (30a), the second outdoor heat exchanger (30b), and the third outdoor heat exchanger (30c) through the first branch liquid pipe (40), the second branch liquid pipe (42), and the third branch liquid pipe (44).

[0111] The refrigerant that has been heat-exchanged by flowing through the first outdoor heat exchanger (30a), the second outdoor heat exchanger (30b), and the third outdoor heat exchanger (30c) in parallel flows to the compressor (22).

[0112] The refrigerant flowing through the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) in parallel flows to the compressor (22) via the first switching valve (24). The refrigerant flowing through the third outdoor heat exchanger (30c) flows to the compressor (22) via the second switching valve (26).

[0113] Referring to FIGS. 4 and FIGS. 5, the flow of the refrigerant in the third mode is explained.

[0114] The third mode (or, 'hot water supply only mode') is a state in which multiple indoor units (10a, 10b, 10c) are stopped. Additionally, the third mode may be a hot water supply mode that heats the water tank. That is, the third mode is an operating mode to which only the hot water supply mode is applied.

[0115] The third mode (or, 'hot water supply only mode') can be operated as the third-1 mode (or, 'first hot water supply only mode') as shown in FIG. 4 and the third-2 mode (or, 'second hot water supply only mode') as shown in FIG. 5. In the third-1 mode and the third-2 mode, the refrigerant flow inside the outdoor unit is partially changed.

[0116] Mode 3-1 and Mode 3-2 can be operated alternately.

[0117] First, the 3-1 mode will be explained with reference to Fig. 4.

[0118] In the 3-1 mode, multiple indoor units (10a, 10b, 10c) are all stopped. In the 3-1 mode, the water tank (14) is heated. In the 3-1 mode, the first outdoor heat exchanger (30a), the second outdoor heat exchanger (30b), and the third outdoor heat exchanger (30c) are used as evaporators.

[0119] In the 3-1 mode, the first switching valve (24) sends the refrigerant flowing from the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) to the compressor (22). In the 3-1 mode, the second switching valve (26) sends the refrigerant flowing from the third outdoor heat exchanger (30c) to the compressor (22).

[0120] In mode 3-1, the variable pass valve (54) is closed. In mode 3-1, the first outdoor expansion valve (32a), the second outdoor expansion valve (32b), and the third outdoor expansion valve (32c) are all opened. In mode 3-1, each of the first outdoor expansion valve (32a), the second outdoor expansion valve (32b), and the third outdoor expansion valve (32c) expands the flowing refrigerant.

[0121] Accordingly, the refrigerant discharged from the compressor (22) flows outside the outdoor unit (20) through the high-pressure refrigerant pipe (34).

[0122] The refrigerant flowing outside the outdoor unit (20) through the high-pressure refrigerant pipe (34) flows into the water tank (14) through the hydro kit (16).

[0123] The refrigerant flowing through the water tank (14) to the hydrokit (16) flows to the outdoor unit (20) through the liquid pipe (38).

[0124] The refrigerant flowing to the outdoor unit (20) through the liquid pipe (38) can flow to the first outdoor heat exchanger (30a), the second outdoor heat exchanger (30b), and the third outdoor heat exchanger (30c) through the first branch liquid pipe (40), the second branch liquid pipe (42), and the third branch liquid pipe (44).

[0125] The refrigerant that has been heat-exchanged by flowing through the first outdoor heat exchanger (30a), the second outdoor heat exchanger (30b), and the third outdoor heat exchanger (30c) in parallel flows to the compressor (22).

[0126] The refrigerant flowing through the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) in parallel flows to the compressor (22) via the first switching valve (24). The refrigerant flowing through the third outdoor heat exchanger (30c) flows to the compressor (22) via the second switching valve (26).

[0127] Referring to Fig. 5, the 3-2 mode is explained.

[0128] In the 3-2 mode, multiple indoor units (10a, 10b, 10c) are all stopped. In the 3-2 mode, the water tank (14) is heated.

[0129] In the 3-2 mode, the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) are used as evaporators. In the 3-2 mode, the third outdoor heat exchanger (30c) is used as a condenser.

[0130] In the 3-2 mode, the first switching valve (24) sends the refrigerant flowing from the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) to the compressor (22). In the 3-2 mode, the second switching valve (26) sends a portion of the refrigerant discharged from the compressor (22) to the third outdoor heat exchanger (30c).

[0131] In mode 3-2, the variable pass valve (54) is closed. In mode 3-2, the first outdoor expansion valve (32a), the second outdoor expansion valve (32b), and the third outdoor expansion valve (32c) are all opened. In mode 3-1, the first outdoor expansion valve (32a) and the second outdoor expansion valve (32b) each expand the flowing refrigerant.

[0132] Accordingly, a portion of the refrigerant discharged from the compressor (22) flows outside the outdoor unit (20) through the high-pressure refrigerant pipe (34). Another portion of the refrigerant discharged from the compressor (22) flows to the third outdoor heat exchanger (30c) through the second switching valve (26).

[0133] The refrigerant flowing outside the outdoor unit (20) through the high-pressure refrigerant pipe (34) flows into the water tank (14) through the hydro kit (16).

[0134] The refrigerant flowing through the water tank (14) to the hydrokit (16) flows to the outdoor unit (20) through the liquid pipe (38).

[0135] The refrigerant flowing to the outdoor unit (20) through the liquid pipe (38) can flow to the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) through the first branch liquid pipe (40) and the second branch liquid pipe (42).

[0136] The refrigerant that has been heat-exchanged by flowing through the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) in parallel flows to the compressor (22).

[0137] The refrigerant flowing in parallel through the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) respectively flows to the compressor (22) via the first switching valve (24).

[0138] The refrigerant flowing from the third outdoor heat exchanger (30c) flows through the third branch liquid pipe (44) and then flows into the first branch liquid pipe (40) and the second branch liquid pipe (42), respectively.

[0139] Referring to Fig. 6, the flow of the refrigerant in the fourth mode is explained.

[0140] The fourth mode may be a simultaneous operation mode in which a portion (10a, 10b) of a plurality of indoor units (10a, 10b, 10c) is used as an evaporator and the remaining portion (10c) of a plurality of indoor units (10a, 10b, 10c) is used as a condenser.

[0141] However, among the plurality of indoor units (10a, 10b, 10c), the number of indoor units (10a, 10b) used as evaporators may be greater than the number of indoor units (10c) used as condensers. Accordingly, in the fourth mode, the first outdoor heat exchanger (30a), the second outdoor heat exchanger (30b), and the third outdoor heat exchanger (30c) are used as condensers.

[0142] The fourth mode may be a hot water supply mode that heats the water tank. In other words, the fourth mode is an operation mode in which the simultaneous operation mode and the hot water supply mode are applied simultaneously.

[0143] In the fourth mode, some (10a, 10b) of the plurality of indoor units (10a, 10b, 10c) are used as evaporators, and the remaining portion (10c) is used as a condenser. In the fourth mode, the water tank (14) is heated.

[0144] In the fourth mode, the first switching valve (24) sends the refrigerant discharged from the compressor (22) to the first outdoor heat exchanger (30a). In the fourth mode, the second switching valve (26) sends the refrigerant discharged from the compressor (22) to the third outdoor heat exchanger (30c).

[0145] In the fourth mode, the variable pass valve (54) is opened. In the fourth mode, the first outdoor expansion valve (32a) is closed. In the fourth mode, the second outdoor expansion valve (32b) and the third outdoor expansion valve (32c) are opened.

[0146] Accordingly, a portion of the refrigerant discharged from the compressor (22) flows sequentially through the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) to flow outside the outdoor unit (20). Additionally, another portion of the refrigerant discharged from the compressor (22) flows through the third outdoor heat exchanger (30c) to flow outside the outdoor unit (20).

[0147] Another portion of the refrigerant discharged from the compressor (22) flows outside the outdoor unit (20) through the high-pressure refrigerant pipe (34).

[0148] The refrigerant flowing outside the outdoor unit (20) through the high-pressure refrigerant pipe (34) can flow into the water tank (14) through the hydro kit (16).

[0149] The refrigerant flowing outside the outdoor unit (20) through the liquid pipe (38) flows through the refrigerant distributor (12) to some of the multiple indoor units (10a, 10b, 10c). The refrigerant flowing outside the outdoor unit (20) through the high-pressure refrigerant pipe (34) can flow through the refrigerant distributor (12) to some of the remaining indoor units.

[0150] Among the multiple indoor units (10a, 10b, 10c), the refrigerant that has been heat-exchanged in the indoor unit used as a condenser can flow to the indoor unit used as an evaporator.

[0151] Among the multiple indoor units (10a, 10b, 10c), the refrigerant that has undergone heat exchange in the indoor unit used as an evaporator can flow to the compressor (22) of the outdoor unit (20) through the low-pressure refrigerant pipe (36). Additionally, the refrigerant flowing to the hydrokit (16) via the water tank (14) can flow through the liquid pipe (38).

[0152] Referring to FIGS. 7 and FIGS. 8, the flow of the refrigerant in the fifth mode is explained.

[0153] The fifth mode is a simultaneous operation mode in which some (10a, 10b) of the multiple indoor units (10a, 10b, 10c) are used as condensers and the remaining some (10c) are used as evaporators.

[0154] However, among the multiple indoor units (10a, 10b, 10c), the number of indoor units (10a, 10b) used as condensers may be greater than the number of indoor units (10c) used as evaporators. Therefore, in the fifth mode, the first outdoor heat exchanger (30a), the second outdoor heat exchanger (30b), and the third outdoor heat exchanger (30c) can mostly be used as evaporators.

[0155] The 5th mode can be operated as the 5-1 mode as shown in FIG. 7 and the 5-2 mode as shown in FIG. 8. In the 5-1 mode and the 5-2 mode, the refrigerant flow inside the outdoor unit is partially changed.

[0156] Modes 5-1 and 5-2 can be operated alternately.

[0157] First, the 5-1 mode will be explained with reference to Fig. 7.

[0158] Mode 5-1 may be a simultaneous operation mode in which a portion (10a, 10b) of a plurality of indoor units (10a, 10b, 10c) is used as a condenser, and the remaining portion (10c) of a plurality of indoor units (10a, 10b, 10c) is used as an evaporator. Additionally, Mode 5-1 may be a hot water supply mode for heating a water tank. That is, Mode 5-1 is an operation mode in which the simultaneous operation mode and the hot water supply mode are applied simultaneously.

[0159] In the 5-1 mode, the load generated in the indoor unit (10a, 10b) used as a condenser is formed to be greater than the load generated in the indoor unit (10c) used as an evaporator.

[0160] In mode 5-1, the water tank (14) is heated.

[0161] In the 5-1 mode, the first outdoor heat exchanger (30a), the second outdoor heat exchanger (30b), and the third outdoor heat exchanger (30c) are used as evaporators.

[0162] In the 5-1 mode, the first switching valve (24) sends the refrigerant flowing from the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) to the compressor (22). In the 5-1 mode, the second switching valve (26) sends the refrigerant flowing from the third outdoor heat exchanger (30c) to the compressor (22).

[0163] In mode 5-1, the variable pass valve (54) is closed. In mode 5-1, the first outdoor expansion valve (32a), the second outdoor expansion valve (32b), and the third outdoor expansion valve (32c) are all opened. In mode 5-1, each of the first outdoor expansion valve (32a), the second outdoor expansion valve (32b), and the third outdoor expansion valve (32c) expands the flowing refrigerant.

[0164] Accordingly, the refrigerant discharged from the compressor (22) flows outside the outdoor unit (20) through the high-pressure refrigerant pipe (34).

[0165] The refrigerant flowing outside the outdoor unit (20) through the high-pressure refrigerant pipe (34) can flow into the water tank (14) through the hydro kit (16).

[0166] The refrigerant flowing outside the outdoor unit (20) through the high-pressure refrigerant pipe (34) flows through the refrigerant distributor (12) to the indoor unit (10a, 10b) used as a condenser among the plurality of indoor units (10a, 10b, 10c).

[0167] A portion of the refrigerant that has undergone heat exchange in the indoor unit used as a condenser can flow through the refrigerant distributor (12) to the indoor unit (10c) used as an evaporator. The remaining portion of the refrigerant that has undergone heat exchange in the indoor unit used as a condenser flows into the outdoor unit (20) through the liquid pipe (38).

[0168] The refrigerant flowing through the water tank (14) to the hydrokit (16) flows to the outdoor unit (20) through the liquid pipe (38).

[0169] The refrigerant flowing to the outdoor unit (20) through the liquid pipe (38) can flow to the first outdoor heat exchanger (30a), the second outdoor heat exchanger (30b), and the third outdoor heat exchanger (30c) through the first branch liquid pipe (40), the second branch liquid pipe (42), and the third branch liquid pipe (44).

[0170] The refrigerant that has been heat-exchanged by flowing through the first outdoor heat exchanger (30a), the second outdoor heat exchanger (30b), and the third outdoor heat exchanger (30c) in parallel flows to the compressor (22).

[0171] The refrigerant flowing through the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) in parallel flows to the compressor (22) via the first switching valve (24). The refrigerant flowing through the third outdoor heat exchanger (30c) flows to the compressor (22) via the second switching valve (26).

[0172] With reference to Fig. 8, the 5-2 mode is explained.

[0173] Mode 5-2 may be a simultaneous operation mode in which a portion (10a, 10b) of a plurality of indoor units (10a, 10b, 10c) is used as a condenser and the remaining portion (10c) of a plurality of indoor units (10a, 10b, 10c) is used as an evaporator. Additionally, Mode 5-2 may be a hot water supply mode for heating a water tank. That is, Mode 5-2 is an operation mode in which the simultaneous operation mode and the hot water supply mode are applied simultaneously.

[0174] In the 5-2 mode, the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) are used as evaporators. In the 5-2 mode, the third outdoor heat exchanger (30c) is used as a condenser.

[0175] In the 5-2 mode, the first switching valve (24) sends the refrigerant flowing from the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) to the compressor (22). In the 5-2 mode, the second switching valve (26) sends the refrigerant flowing from the third outdoor heat exchanger (30c) to the compressor (22).

[0176] In mode 5-2, the variable pass valve (54) is closed. In mode 5-2, the first outdoor expansion valve (32a), the second outdoor expansion valve (32b), and the third outdoor expansion valve (32c) are all opened.

[0177] In the 5-2 mode, the first outdoor expansion valve (32a), the second outdoor expansion valve (32b), and the third outdoor expansion valve (32c) each expand the flowing refrigerant.

[0178] In the 5-2 mode, a portion of the refrigerant discharged from the compressor (22) flows outside the outdoor unit (20) through the high-pressure refrigerant pipe (34). Another portion of the refrigerant discharged from the compressor (22) flows to the third outdoor heat exchanger (30c) through the second switching valve (26).

[0179] The refrigerant flowing outside the outdoor unit (20) through the high-pressure refrigerant pipe (34) can flow into the water tank (14) through the hydro kit (16).

[0180] The refrigerant flowing outside the outdoor unit (20) through the high-pressure refrigerant pipe (34) flows through the refrigerant distributor (12) to the indoor unit (10a, 10b) used as a condenser among the plurality of indoor units (10a, 10b, 10c).

[0181] A portion of the refrigerant that has undergone heat exchange in the indoor unit used as a condenser can flow through the refrigerant distributor (12) to the indoor unit (10c) used as an evaporator. The remaining portion of the refrigerant that has undergone heat exchange in the indoor unit used as a condenser flows into the outdoor unit (20) through the liquid pipe (38).

[0182] The refrigerant flowing through the water tank (14) to the hydrokit (16) flows to the outdoor unit (20) through the liquid pipe (38).

[0183] The refrigerant flowing to the outdoor unit (20) through the liquid pipe (38) can flow to the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) through the first branch liquid pipe (40) and the second branch liquid pipe (42).

[0184] The refrigerant that has been heat-exchanged by flowing through the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) in parallel flows to the compressor (22).

[0185] The refrigerant flowing in parallel through the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) respectively flows to the compressor (22) via the first switching valve (24).

[0186] The refrigerant flowing from the third outdoor heat exchanger (30c) flows through the third branch liquid pipe (44) and then flows into the first branch liquid pipe (40) and the second branch liquid pipe (42), respectively.

[0187] Referring to Fig. 9, the flow of the refrigerant in the 6th mode is explained.

[0188] The 6th mode may be a defrosting operation mode in which high-pressure refrigerant is sent as part of an outdoor heat exchanger during the process in which all of the multiple indoor units (10a, 10b, 10c) are used as condensers. Additionally, the 6th mode may be a hot water supply mode for heating a water tank. That is, the 6th mode is an operation mode in which heating operation, defrosting operation, and hot water supply mode are applied simultaneously.

[0189] Mode 6 can be executed based on outdoor temperature conditions. That is, Mode 6 can be executed when the outdoor temperature is below the set temperature.

[0190] In the 6th mode, multiple indoor units (10a, 10b, 10c) are all used as condensers. In the 6th mode, the water tank (14) is heated.

[0191] In the 6th mode, the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) are used as evaporators. In the 6th mode, the third outdoor heat exchanger (30c) is used as a condenser.

[0192] In the sixth mode, the first switching valve (24) sends the refrigerant flowing from the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) to the compressor (22). In the sixth mode, the second switching valve (26) sends a portion of the refrigerant discharged from the compressor (22) to the third outdoor heat exchanger (30c).

[0193] In the sixth mode, the variable pass valve (54) is closed. In the sixth mode, the first outdoor expansion valve (32a), the second outdoor expansion valve (32b), and the third outdoor expansion valve (32c) are all opened. In the sixth mode, each of the first outdoor expansion valve (32a), the second outdoor expansion valve (32b), and the third outdoor expansion valve (32c) expands the flowing refrigerant.

[0194] Accordingly, a portion of the refrigerant discharged from the compressor (22) flows outside the outdoor unit (20) through the high-pressure refrigerant pipe (34). Another portion of the refrigerant discharged from the compressor (22) flows to the third outdoor heat exchanger (30c) through the second switching valve (26).

[0195] A portion of the refrigerant flowing outside the outdoor unit (20) through the high-pressure refrigerant pipe (34) can flow into the water tank (14) through the hydrokit (16).

[0196] Another portion of the refrigerant flowing outside the outdoor unit (20) through the high-pressure refrigerant pipe (34) flows to each of the multiple indoor units (10a, 10b, 10c) through the refrigerant distributor (12).

[0197] The refrigerant that has been heat-exchanged in each of the multiple indoor units (10a, 10b, 10c) flows to the outdoor unit (20) through the liquid pipe (38). The refrigerant that flows through the water tank (14) to the hydrokit (16) flows to the outdoor unit (20) through the liquid pipe (38).

[0198] The refrigerant flowing to the outdoor unit (20) through the liquid pipe (38) can flow to the first outdoor heat exchanger (30a), the second outdoor heat exchanger (30b), and the third outdoor heat exchanger (30c) through the first branch liquid pipe (40), the second branch liquid pipe (42), and the third branch liquid pipe (44).

[0199] The refrigerant that has been heat-exchanged by flowing through the first outdoor heat exchanger (30a), the second outdoor heat exchanger (30b), and the third outdoor heat exchanger (30c) in parallel flows to the compressor (22).

[0200] The refrigerant flowing in parallel through the first outdoor heat exchanger (30a) and the second outdoor heat exchanger (30b) respectively flows to the compressor (22) via the first switching valve (24). The refrigerant flowing from the third outdoor heat exchanger (30c) flows through the third branch liquid pipe (44) and flows to the first branch liquid pipe (40) and the second branch liquid pipe (42) respectively.

[0201] Referring to Fig. 10, a control method for an air conditioner / water heater will be explained.

[0202] The control method described in FIG. 10 relates to a control method in which the 3-1 mode (or 1st hot water dedicated mode) and the 3-2 mode (or 2nd hot water dedicated mode) are changed during the process of performing the 3rd mode (or, 'hot water dedicated mode').

[0203] That is, multiple indoor units (10a, 10b, 10c) are in a stopped state, and the process can proceed in a hot water supply mode that heats the water tank (S100).

[0204] First, the step (S100) of operating the 3-1 mode is performed. The 3-1 mode may be operated by the user. However, even if the user specifies only the 3 mode, it may be operated in the 3-1 mode.

[0205] Afterwards, it is determined whether the frequency (Hz) of the compressor (22) is lower than the set frequency (Hz) (S200). At this time, it is possible to determine whether the frequency of the compressor (22) is the lowest frequency at which the compressor (22) operates.

[0206] In addition, it is determined whether the pressure of the refrigerant discharged from the compressor (22) exceeds the set pressure (S300).

[0207] If the frequency of the compressor (22) is lower than the set frequency and the pressure of the refrigerant discharged from the compressor (22) exceeds the set pressure, damage to the compressor (22) may occur due to overload of the compressor (22).

[0208] This can occur when the load in the area used as a condenser is very low. That is, when the operation of multiple indoor units (10a, 10b, 10c) is stopped and only the water tank (14) is supplied with hot water, after a certain amount of time has elapsed, the load for heating the water tank (14) can be formed to be very low.

[0209] When the above conditions are satisfied, the operation is switched to the 3-2 mode (S400).

[0210] That is, the second switching valve (26) can be switched so that the refrigerant discharged from the compressor (22) flows to the third outdoor heat exchanger (30c). Accordingly, since the third outdoor heat exchanger (30c) is used as a condenser, the load resulting from the operation of the third outdoor heat exchanger (30c) may increase.

[0211] However, thereafter, a step (S500) is performed to determine whether some of the multiple indoor units (10a, 10b, 10c) operate as condensers.

[0212] That is, when some of the multiple indoor units (10a, 10b, 10c) are operated as condensers, the load of the area used as a condenser increases, so the operation can be switched to the 3-1 mode (S600).

[0213] However, if all of the multiple indoor units (10a, 10b, 10c) are still in a stopped state, operation of the 3-2 mode can be maintained (S700).

[0214] In addition, a step (S800) is performed to determine whether the hot water supply and cooling temperature exceeds the set temperature. Here, the hot water supply and cooling temperature may be the temperature difference between the water temperature of the water tank (14) and the temperature of the refrigerant or cooling water intended to heat the water of the water tank (14).

[0215] Therefore, if the hot water supply and cooling temperature exceed the set temperature, it can be determined that the load for heating the water tank (14) has increased.

[0216] Therefore, when the hot water supply and cooling temperature exceed the set temperature, the operation is switched to the 3-1 mode (S600).

[0217] However, when the hot water supply and cooling temperature is below the set temperature, the operation of mode 3-2 is maintained (S900).

[0218] Although preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above. Various modifications are possible by those skilled in the art without departing from the essence of the present disclosure as claimed in the claims, and such modifications should not be understood individually from the technical spirit or perspective of the present disclosure.

Claims

1. Outdoor unit including a compressor; A water tank that heats stored water using the heat of the refrigerant discharged from the above compressor; A plurality of indoor units including indoor heat exchangers; It includes a refrigerant distributor connecting the above outdoor unit and the above plurality of indoor units, The above outdoor unit is, An outdoor heat exchanger including a first outdoor heat exchanger and a third outdoor heat exchanger, and A first switching valve connecting the above compressor and the above first outdoor heat exchanger, and An air conditioning water heater including a second switching valve connecting the above compressor and the above third outdoor heat exchanger.

2. In Paragraph 1, The above outdoor unit is an air conditioning water heater comprising a second outdoor heat exchanger connected in parallel or in series with the first outdoor heat exchanger according to the flow direction of the refrigerant.

3. In Paragraph 1, The above outdoor unit is, A discharge pipe that sends the refrigerant discharged from the above compressor to the above first switching valve, and A suction pipe that sends the refrigerant flowing from the first switching valve to the compressor, and A first branch pipe connecting the discharge pipe and the second switching valve, and An air conditioning water heater comprising a second branch pipe connecting the second switching valve and the suction pipe.

4. In Paragraph 1, The above outdoor unit is connected to the above refrigerant distributor by three refrigerant pipes, and The above refrigerant distributor is an air conditioning water heater connected to each of the plurality of indoor units by two refrigerant pipes.

5. In Paragraph 1, It includes a liquid pipe connecting the above outdoor heat exchanger and the above refrigerant distributor, The above outdoor unit is, A second outdoor heat exchanger connected in parallel or in series with the first outdoor heat exchanger according to the flow direction of the refrigerant, and A first branch liquid pipe connecting the first outdoor heat exchanger and the liquid pipe, and A second branch liquid pipe connecting the second outdoor heat exchanger and the liquid pipe, and A third branch liquid pipe connecting the above third outdoor heat exchanger and the above liquid pipe, and A first outdoor expansion valve disposed in the first branch liquid pipe, and A second outdoor expansion valve disposed in the second branch liquid pipe, and An air conditioning water heater including a third outdoor expansion valve disposed in the third branch liquid pipe.

6. In Paragraph 5, The above outdoor unit is, A first connecting pipe connecting the first outdoor heat exchanger and the first switching valve, and A second connecting pipe connecting the second outdoor heat exchanger and the first connecting pipe, and It includes a third connecting pipe connecting the third outdoor heat exchanger and the second switching valve, An air conditioner water heater having a check valve disposed in the second connecting pipe to block the flow of refrigerant flowing through the first connecting pipe into the second connecting pipe.

7. In Paragraph 6, The above outdoor unit is an air conditioning water heater comprising a variable pass pipe connecting the first branch pipe and the second connecting pipe, and a variable pass valve for opening and closing the variable pass pipe.

8. In Paragraph 1, In an operating mode where the operation of all the above-mentioned multiple indoor units is stopped and the water in the water tank is heated, The first switching valve sends the refrigerant flowing from the first outdoor heat exchanger to the compressor, and The above second switching valve is an air conditioning water heater that sends the refrigerant flowing from the third outdoor heat exchanger to the compressor or sends the refrigerant flowing from the compressor to the third outdoor heat exchanger based on the operating conditions of the compressor.

9. In Paragraph 8, The above second switching valve is an air conditioning water heater that sends the refrigerant flowing from the compressor to the third outdoor heat exchanger when the frequency of the compressor is below the set frequency.

10. In Paragraph 8, The above second switching valve is an air conditioning water heater that sends the refrigerant flowing from the compressor to the third outdoor heat exchanger when the discharge pressure of the compressor is higher than the set pressure.

11. In Paragraph 1, In an operating mode in which more than half of the above plurality of indoor units operate as condensers and heat the water in the water tank, The first switching valve sends the refrigerant flowing from the first outdoor heat exchanger to the compressor, and The above second switching valve is an air conditioning water heater that sends the refrigerant flowing from the above third outdoor heat exchanger to the compressor or sends the refrigerant flowing from the compressor to the above third outdoor heat exchanger based on outdoor temperature conditions.

12. In Paragraph 11, The above second switching valve is an air conditioning water heater that sends the refrigerant flowing from the compressor to the third outdoor heat exchanger when the outdoor temperature is lower than the set temperature.

13. A step of operating a first hot water supply mode in which the operation of all multiple indoor units is stopped and the water in the water tank is heated, wherein a first switching valve sends refrigerant flowing from a first outdoor heat exchanger and a second outdoor heat exchanger to a compressor, and a second switching valve sends refrigerant flowing from a third outdoor heat exchanger to the compressor; A control method for an air conditioning water heater comprising the step of operating a second hot water supply mode by adjusting the second switching valve to allow the refrigerant flowing from the compressor to flow to the third outdoor heat exchanger based on the operating conditions of the compressor.

14. In Paragraph 13, A control method for an air conditioning water heater that proceeds with the step of operating the second hot water dedicated mode when the frequency of the compressor is below the set frequency.

15. In Paragraph 13, A control method for an air conditioning water heater that proceeds with the step of operating the second hot water supply mode when the discharge pressure of the compressor is higher than the set pressure.

16. In Paragraph 13, A control method for an air conditioning water heater, wherein, after the above-mentioned second hot water dedicated mode is performed, when at least one of the plurality of indoor units is operated, the step of operating the above-mentioned first hot water dedicated mode by adjusting the above-mentioned second switching valve is performed.

17. In Paragraph 13, A control method for an air conditioning water heater, wherein, after the above-mentioned second hot water supply mode is executed, when the hot water supply and cooling temperature of the water tank exceeds the set temperature, the above-mentioned second switching valve is adjusted to operate the above-mentioned first hot water supply mode.

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