KR101250551B1 - Air conditioner and control method of the same - Google Patents

Abstract

PURPOSE: An air conditioner and an operating method thereof are provided to minimize power the consumption of a pump by reducing a minimum flow rate of heat source water by a user or an installer when conditions of a space, where the air conditioner is installed such, as weather is fine. CONSTITUTION: An air conditioner comprises an indoor unit(2), an outdoor unit(4), a heat source water passage, a pump(90), a variable flow rate valve(10), and a variable flow rate valve controlling unit. An indoor heat exchanger heat-exchanging with indoor air is installed in the indoor unit. The outdoor unit is connected to the indoor unit with a refrigerant passage. A water-refrigerant heat exchanger heat-exchanging the refrigerant and water is installed in the outdoor unit. The heat source water passage is connected to the water-refrigerant heat exchanger. The pump is installed in the heat source water passage. The variable flow rate valve is installed in the heat source water passage, and an opened degree of the variable flow rate valve is adjusted by the variable flow rate valve controlling unit. The variable flow rate valve controlling unit includes a minimum flow rate adjusting unit adjusting a minimum flow rate of heat source water and adjusts an opened degree of the variable flow rate valve according to the adjustment of the minimum flow rate adjusting unit.

Description

Air conditioner and its operation method {Air conditioner and Control method of the same}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner and a method of operating the same, and more particularly, to an air conditioner and a method of operating the same, having a water refrigerant heat exchanger in which heat source water and a refrigerant exchange heat.

In general, an air conditioner is a device that cools or heats a room by using a refrigeration cycle of a refrigerant. When a refrigerant is sequentially compressed, condensed, expanded, and evaporated, and when the refrigerant evaporates, it absorbs the surrounding heat and liquefies it. Cooling or heating is performed by the property of releasing the heat.

The air conditioner may condense or evaporate the refrigerant using outdoor air, and may condense or evaporate the refrigerant using heat source water such as water.

In the air conditioner, a water refrigerant heat exchanger for exchanging heat source water such as water with a refrigerant may be installed between the compressor and the expansion mechanism, and the refrigerant may be condensed or evaporated by the heat source water such as water.

The water refrigerant heat exchanger may be connected to an inflow channel for supplying the heat source water to the water refrigerant heat exchanger, and an outlet channel through which the heat source water exchanged with the refrigerant in the plate heat exchanger may be connected. Pumping pumps can be installed.

KR 10-2010-0064835 A (2010.06.15)

The air conditioner according to the prior art adjusts the opening degree of the flow control valve by using the operation rate of the compressor according to the operating capacity of the indoor unit or by using the sensed temperature of the water return pipe, so that the user or the installer can install the air conditioner There is a problem that can not be adjusted by selecting the opening range of the flow control valve in consideration of the power.

An air conditioner according to the present invention for solving the above problems is an indoor unit having an indoor heat exchanger which is heat-exchanged with indoor air; An outdoor unit connected to the indoor unit and a refrigerant flow path, and having a water refrigerant heat exchanger configured to exchange heat between the refrigerant and water; A heat source water flow passage connected to the water refrigerant heat exchanger; A pump installed in the heat source water passage; A oil displacement valve installed in the heat source water flow path and having an adjustable opening degree; And a flow rate valve control unit for controlling an opening degree of the flow rate valve, wherein the flow rate valve control unit includes a heat source minimum flow rate operation unit configured to operate a minimum flow rate of the heat source water, Adjust the opening.

In the method of operating an air conditioner according to the present invention, an indoor unit and an outdoor unit are connected to a refrigerant passage, a water refrigerant heat exchanger for exchanging water between a refrigerant and an outdoor unit is installed, and a heat source water passage is connected to the water refrigerant heat exchanger, A method of operating an air conditioner for operating an air conditioner provided with a pump and an adjustable oil amount valve having an opening degree, the method comprising: operating a minimum heat source water flow rate through a heat source water minimum flow rate control unit installed in the oil amount valve control unit controlling the oil amount valve; ; Setting a control lower limit value according to the minimum flow rate of the heat source water; The oil quantity valve control unit includes controlling the oil quantity valve by more than the control lower limit value.

The present invention has the advantage that the user or installer can minimize the power consumption of the pump by operating the minimum flow rate of the heat source water when the climate and the like conditions where the air conditioner is installed, the climate, where the air conditioner is installed If the lamp is in a bad condition, the user or the installer may increase the heating or cooling performance by operating the minimum flow rate of the heat source water, and there is an advantage that the power consumption and efficiency can be selectively adjusted as desired.

1 is a view showing a refrigerant flow and a heat source water flow during the cooling operation of an embodiment of the air conditioner according to the present invention;
2 is a view showing a refrigerant flow and a heat source water flow during the heating operation of an embodiment of the air conditioner according to the present invention;
3 is a view schematically showing an outdoor unit and a flow rate valve and a pump of an embodiment of an air conditioner according to the present invention;
FIG. 4 is a view illustrating a fluid flow rate valve control unit illustrated in FIG. 3;
5 is a control block diagram of an embodiment of an air conditioner according to the present invention.
6 is a flowchart of an embodiment of a method of operating an air conditioner according to the present invention.

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

1 is a view showing a refrigerant flow and a heat source water flow during the cooling operation of one embodiment of the air conditioner according to the present invention, Figure 2 is a refrigerant flow and a heat source water flow during the heating operation of an embodiment of the air conditioner according to the present invention 3 is a view schematically illustrating an outdoor unit and a flow rate valve and a pump of an embodiment of the air conditioner according to the present invention, and FIG. 4 is a view showing the flow rate valve control unit shown in FIG. 3. 5 is a control block diagram of an embodiment of an air conditioner according to the present invention.

The air conditioner of the present embodiment may include an indoor unit 2, an outdoor unit 4, a heat source water flow path 8, and a fluid flow rate valve 10.

A plurality of indoor units 2 may be connected to the outdoor unit 4, and may be connected to the outdoor unit 4 in parallel.

The indoor unit 2 may include an indoor heat exchanger 12 that exchanges heat with indoor air.

The indoor unit 2 may include an indoor fan 14 which blows indoor air to the indoor heat exchanger 12 and then discharges the indoor air.

The air conditioner may include an indoor expansion mechanism 16 for expanding the refrigerant flowing into the indoor heat exchanger 12. The indoor expansion mechanism 16 may be installed in the indoor unit 2 together with the indoor heat exchanger 12 and the indoor fan 14, and may be formed of an electronic expansion valve such as an LEV valve. The indoor expansion mechanism 16 may be connected to the indoor heat exchanger 12 and the indoor heat exchanger connection passage 18.

The indoor heat exchanger 12 may function as an evaporator in which the refrigerant evaporates while exchanging heat with the indoor air when the refrigerant having the low temperature and low pressure expanded by the indoor expansion mechanism 16 passes, and the high temperature and high pressure flowed by the outdoor unit 4. When the refrigerant passes, the refrigerant may function as a condenser that condenses as it heat exchanges with the indoor air.

The outdoor unit 4 may include a water refrigerant heat exchanger 42 for exchanging refrigerant with heat source water such as water.

The air conditioner may include a compression unit 44 that sucks and compresses the refrigerant and discharges the refrigerant, and an outdoor expansion mechanism 46 for expanding the refrigerant flowing into the water refrigerant heat exchanger 42.

When the high temperature and high pressure refrigerant discharged from the compression unit 44 passes through the water refrigerant heat exchanger 42, the refrigerant may function as a condenser that condenses while being exchanged with heat source water such as water, and in the outdoor expansion mechanism 46. When the flowing low temperature low pressure refrigerant passes, the refrigerant may function as an evaporator that is evaporated while heat exchanged with heat source water such as water.

The water refrigerant heat exchanger 42 may be formed with a refrigerant heat exchange passage through which refrigerant is condensed or evaporated while a heat source water heat exchange passage through which the heat source water is heated or cooled. The water refrigerant heat exchanger 42 may consist of a plate heat exchanger or a shell tube heat exchanger. When the water refrigerant heat exchanger 42 is a plate heat exchanger, the refrigerant heat exchange passage and the heat source water heat exchange passage may be partitioned through the plate heat transfer member, and the refrigerant and the water may be heat exchanged through the plate heat transfer member. When the water refrigerant heat exchanger 42 is a shell tube type heat exchanger, the refrigerant heat exchange passage and the heat source water heat exchange passage may be partitioned by a tube disposed inside the shell, and the refrigerant and the heat source water may be exchanged through the tube.

The compression unit 44 may be installed in the outdoor unit 4 together with the water refrigerant heat exchanger 42 and the outdoor expansion mechanism 46.

The compression unit 44 sucks and compresses the refrigerant in the refrigerant suction passage 47 and discharges the refrigerant to the refrigerant discharge passage 48. The compression unit 44 is configured to vary in capacity. The compression unit 44 includes at least one compressor 49 and 50 to which the refrigerant suction passage 47 and the refrigerant discharge passage 48 are connected. The compressor 49 and 50 may include one inverter compressor having a variable compression capacity, and may include an inverter compressor 49 having a variable compression capacity and a constant speed compressor 50 having a constant compression capacity. Hereinafter, an example including the inverter compressor 49 and the constant speed compressor 50 will be described.

The refrigerant suction passage 47 may be connected in parallel to the inverter compressor 49 and the constant speed compressor 50. The refrigerant suction passage 47 is an inverter compressor suction passage 51 connected to the inverter compressor 49, a constant speed compressor suction passage 52 connected to the constant speed compressor 50, and an inverter compressor suction passage 51 and a constant speed. The compressor suction passage 52 may include a common suction passage 53 connected thereto. The accumulator 54 in which the liquid refrigerant in the refrigerant accumulates may be installed in the refrigerant suction passage 47. The accumulator 54 may be installed in the common suction passage 53.

The refrigerant discharge passage 48 may be connected in parallel to the inverter compressor 49 and the constant speed compressor 50. The refrigerant discharge passage 48 has an inverter compressor discharge passage 55 connected to the inverter compressor 49, a constant speed compressor discharge passage 56 connected to the constant speed compressor 50, and an inverter compressor discharge passage 55. The compressor discharge passage 56 may include a common discharge passage 57 to which the compressor discharge passage 56 is connected. The refrigerant discharge passage 48 may be provided with an inverter compressor oil separator 58 for separating oil from the refrigerant discharged from the inverter compressor 49 and oil into the refrigerant suction passage 47. The refrigerant discharge passage 48 may be provided with a constant speed compressor oil separator 59 for separating oil from the refrigerant discharged from the constant speed compressor 50 and recovering the oil into the refrigerant suction passage 47.

The outdoor expansion mechanism 46 may be connected to the water refrigerant heat exchanger 42 and the water refrigerant heat exchanger connection passage 60. The outdoor expansion mechanism 60 may be connected to the indoor expansion mechanism 16 and the refrigerant passage 62.

The outdoor expansion mechanism 46 may include an outdoor expansion valve that may expand while the refrigerant passes through the heating operation, and the refrigerant flowing out of the water refrigerant heat exchanger 42 bypasses the outdoor expansion valve during the cooling operation. It may further include a check valve installed in the pass passage and the bypass passage.

 The air conditioner may be configured as a combined air conditioning and air conditioner having a cooling cycle and a heating cycle, and may further include a cooling and heating switching valve 64 capable of switching the cooling operation and the heating operation.

The cooling and heating switching valve 64 is connected to the refrigerant suction passage 47, the refrigerant discharge passage 48, the water refrigerant heat exchanger 42, and the indoor heat exchanger 12.

The cooling and heating switching valve 64 may be connected to the common suction channel 53 of the refrigerant suction channel 47. The cooling / heating switching valve 64 may be connected to the common discharge passage 57 of the refrigerant discharge passage 48. The cooling and heating switching valve 64 may be connected to the water refrigerant heat exchanger 42 and the connection passage 66. The air conditioning heating valve 64 may be connected to the indoor heat exchanger 12 and the refrigerant passage 68.

The cooling and heating switching valve 64 may guide the refrigerant compressed by the compression unit 44 during the cooling operation and discharged into the refrigerant discharge passage 48 to flow to the water refrigerant heat exchanger 42, and the indoor heat exchanger 12. The refrigerant flowing in the can be guided to flow to the refrigerant suction passage (47). The cooling and heating switching valve 64 may guide the refrigerant compressed by the compression unit 44 during the heating operation and discharged into the refrigerant discharge passage 48 to flow to the indoor heat exchanger 12, and the water refrigerant heat exchanger 42. The refrigerant flowing in the can be guided to flow to the refrigerant suction passage (47).

The outdoor unit 4 includes a low pressure sensor 67 for detecting a pressure of the refrigerant suction passage 47; It includes a high pressure sensor 68 for detecting the pressure of the refrigerant discharge passage (48).

The low pressure sensor 67 may be installed in the refrigerant suction passage 47, and may be installed in the common suction passage 53 among the refrigerant suction passage 47 to detect the pressure of the refrigerant passing through the common suction passage 53. have.

The high pressure sensor 68 may be installed in the refrigerant discharge passage 48, and may be installed in the common discharge passage 57 of the refrigerant discharge passage 48 to sense the pressure of the refrigerant passing through the common discharge passage 48. have.

The heat source water passage 8 may be connected to an external heat exchanger 82 for exchanging heat source water heat-exchanged with the refrigerant in the water refrigerant heat exchanger 42 to outdoor air or geothermal heat. The heat source water flow passage 8 includes an inflow passage 84 through which the heat source water passing through the external heat exchange facility 82 is supplied to the water refrigerant heat exchanger 42, and the heat source water heat exchanged with the refrigerant in the water refrigerant heat exchanger 42. It may include a water discharge passage 86 that is discharged to the heat exchange facility (82).

The external heat exchange facility 82 includes a cooling tower for cooling the heat source water discharged through the water discharge passage 86 with outdoor air, a geothermal heat exchanger for heat exchange of the heat source water discharged through the discharge passage 86 with geothermal heat, and an output passage ( It may be made of a boiler for heating the heat source water discharged through 86, it may be made of a combination of a cooling tower and geothermal heat exchanger and boiler.

In the heat source water flow path 8, a pump 90 for allowing the heat source water to circulate the water refrigerant heat exchanger 42 and the external heat exchanger 82 may be installed.

The pump 90 may pump the heat source water such that the heat source water circulates through the water refrigerant heat exchanger 42, the water outlet passage 86, the external heat exchange facility 82, and the inlet passage 84. The pump 90 may be installed in at least one of the inlet passage 84 and the outlet passage 86.

The pump 90 may be configured as a variable displacement pump having a variable capacity, and may be composed of an inverter pump having a variable capacity according to an input frequency or a plurality of constant speed pumps having a variable pumping capacity.

The pump 90 may include a pressure sensor capable of sensing a pressure, and when the opening degree of the oil displacement valve 10 is reduced to increase the pressure drop, the pressure sensor detects this, and the pump 90 decreases the rotation speed. In this case, power consumption input to the pump 90 is minimized. On the contrary, when the oil displacement valve 10 has an increased opening degree and the pressure drop decreases, the pump 90 detects this, and the pump 90 increases the rotation speed.

The flow rate valve 10 is capable of adjusting the heat source water entering and exiting the water refrigerant heat exchanger 42, and by adjusting the opening degree, the flow rate of the heat source water circulating in the heat source water flow passage 8 can be varied. The oil quantity flow valve 10 may be installed in at least one of the inflow passage 84 and the outlet passage 86.

The flow rate valve 10 may be opened at the maximum opening at full open and at the minimum opening at the full close.

The oil quantity flow rate valve 10 can maximize the flow volume of the heat source water flow path 8 of a maximum opening city, and can minimize the flow volume of the heat source water flow path 8 of a minimum opening city.

The oil quantity flow valve 10 may be fully open at the start of the cooling operation or at the start of the heating operation. That is, the oil displacement valve 10 may be opened to the maximum valve at the start of the cooling operation or at the start of the heating operation to maximize the heat source water flow rate of the heat source water flow path 8.

When the start of the cooling operation or the start of the heating operation is completed, the oil quantity flow rate valve 10 may change the opening degree so that the flow rate of the heat source water flow path 8 may be adjusted differently from the start of the cooling operation or the start of the heating operation.

When the flow rate valve 10 increases or decreases the opening degree, the opening degree is increased by an increased opening degree by the set opening degree at the current opening of the displacement flow rate valve 10 or by an opening degree decreased by the setting opening degree at the current opening degree of the oil displacement valve 10. Can be reduced.

 When the flow rate valve 10 increases or decreases the opening degree a plurality of times, the opening amount valve 10 may increase the opening degree step by step by a set opening degree or decrease step by step by a setting opening degree.

The air conditioner includes a oil amount valve control unit 100 that controls the oil amount valve 10.

The oil amount valve control unit 100 may variably control the opening degree of the oil amount valve 10.

The oil amount valve control unit 100 may control the opening degree of the oil amount valve 10 according to the load of the outdoor unit 4.

In the cooling operation, the oil quantity valve control unit 100 may increase the opening degree of the oil quantity flow valve 10 when the detected pressure detected by the high pressure sensor 68 is greater than the target condensation pressure, and when the opening degree is increased, the oil quantity valve 10 If the current degree of opening is the maximum degree of opening, the current degree of opening can be maintained.

The oil quantity valve control unit 100 may reduce the opening degree of the oil quantity flow valve 10 when the sensing pressure sensed by the high pressure sensor 68 is less than the target condensation pressure during the cooling operation, and when the opening degree decreases, If the current opening degree is the minimum opening degree, the current opening degree can be maintained.

The oil amount valve control unit 100 may reduce the opening degree of the oil amount valve 10 when the sensing pressure sensed by the low pressure sensor 67 is greater than the target evaporation pressure during heating operation, and the current of the oil amount valve 10 may be reduced when the opening amount is decreased. If the opening degree is the minimum opening degree, the current opening degree can be maintained.

The oil amount valve control unit 100 may increase the opening degree of the oil amount valve 10 when the detected pressure sensed by the low pressure sensor 67 is lower than the target evaporation pressure during heating operation, and when the opening degree is increased, If the current opening degree is the maximum opening degree, the current opening degree can be maintained.

 The oil quantity valve control unit 100 may include a heat source water minimum flow rate operation unit 102 for manipulating a minimum flow rate of the heat source water, and the oil quantity flow rate valve control unit 100 may be a oil quantity valve according to the operation of the heat source water minimum flow rate operation unit 102. Opening degree of (10) can be adjusted.

The oil quantity flow rate valve control unit 100 may set one of a plurality of control lower limit values when the heat source water minimum flow rate operation unit 102 is operated.

 The plurality of control lower limit values may be set between a minimum opening degree control value corresponding to the minimum opening degree of the oil displacement valve 10 and a maximum opening degree control value corresponding to the maximum opening degree of the oil displacement valve 10.

The plurality of control lower limit values may be increased step by step at set value intervals.

For example, when the control value of the oil displacement valve 10 is 0V to 10V, the minimum opening degree control value corresponding to the minimum opening degree of the oil displacement valve 10 may be 0V, and corresponds to the maximum opening degree of the oil displacement valve 10. The maximum opening degree control value is 10V, and a plurality of lower limit values may be set in a range exceeding 0V and below 10V. The lower control limit value may be set to 2V, 4V, 6V, and 8V, where the minimum heat source water flow rate may be set to 20%, 40%, 60%, 80% of the maximum heat source water flow rate. The lower control limit value may be set to 3V, 5V, 7V, and 9V, wherein the minimum heat source water flow rate may be set to 30%, 50%, 70%, 90% of the maximum heat source water flow rate.

As shown in FIG. 4, the heat source minimum flow rate control unit 102 may include a plurality of dip switches 104 and 106, and the oil flow rate valve may be formed by a switching combination of the plurality of dip switches 104 and 106. The lower control limit of 10) can be set.

 The heat source minimum flow rate control unit 102 may have a lower control lower limit value due to a switching combination of the plurality of dip switches 104 and 106 during the cooling operation and the heating operation.

 When the switching combination of the plurality of dip switches 104 and 106 is the same in the cooling operation and the heating operation, the heat source minimum flow rate controller 102 may be set higher than the control lower limit during the cooling operation. Can be.

Table 1 is a table which shows the example which set the control lower limit value according to the switching combination of the heat source water minimum flow volume operation part in cooling operation and heating operation within 0V-10V.

Dip Switch 1 Dip switch 2 During cooling operation
Control lower limit Heating operation
Control lower limit OFF OFF 8V 9 V OFF ON 6 V 7 V ON OFF 4V 5V ON ON 2 V 3 V

For example, when the control value of the oil displacement valve 10 is 0V-10V, when the dip switch 1 and the dip switch 2 are both off and cooling operation, the control lower limit set by the heat-source water minimum flow volume control part 102 will be 8V. The oil quantity valve control unit 100 may output a control value within a range of 8V to 10V to the oil quantity valve 10.

When the control value of the oil quantity flow valve 10 is 0V-10V, when the dip switch 1 and the dip switch 2 are both off and heating operation, the control lower limit set by the heat-source water minimum flow volume control part 102 is 9V, and the oil quantity valve The controller 100 may output the control value within the range of 9V to 10V higher than the control value range during the cooling operation to the oil displacement valve 10.

When the control value of the oil quantity flow valve 10 is 0V-10V, when the dip switch 1 and the dip switch 2 are both ON and cooling operation, the control lower limit set by the heat-source water minimum flow volume control part 102 is 2V, and the oil quantity valve The controller 100 may output a control value within the range of 2V to 10V to the oil displacement valve 10.

When the control value of the oil displacement valve 10 is 0V to 10V, when the dip switch 1 and the dip switch 2 are both on and heating operation, the control lower limit value set by the heat source minimum flow rate control unit 102 is 3V, and the oil displacement valve The controller 100 may output a control value within the range of 3 V to 10 V higher than the control value range during the cooling operation to the oil displacement valve 10.

The oil quantity flow valve 10 may set various control lower limit values according to the operation of the heat source water minimum flow rate operation unit 102 and whether the cooling / heating operation is performed, and detailed description of each example will be omitted.

As shown in FIG. 3, the oil amount valve control unit 100 may be installed in the outdoor unit 4 together with the main control unit 110 controlling the outdoor unit 4, and the main control unit 110 and the main control unit communication line 112 may be installed. ) Can be connected.

Here, the main controller 110 controls the compression unit 44, the outdoor expansion mechanism 46, and the heating / cooling switching valve 64 according to the operation of the indoor unit 2 and the detection of the low pressure sensor 67 and the high pressure sensor 68. Can be controlled.

As shown in FIG. 3, the oil quantity valve control unit 100 may be connected to the oil quantity valve 10 and the oil quantity valve communication line 114, and adjust the opening degree of the oil quantity valve 10 through the oil quantity valve communication line 114. The control value can be output.

  The flow rate valve control unit 100 may be provided with a plurality of dip switches 104 and 106 that may configure the heat source minimum flow rate control unit 102.

A valve communication line connector 116 to which the oil flow rate valve communication line 114 is connected may be installed.

The flow rate valve 100 may be provided with a control unit communication line connector 118 to which the main control unit communication line 112 is connected.

6 is a flowchart of an embodiment of a method of operating an air conditioner according to the present invention.

In the operating method of the air conditioner according to the present embodiment, the step of operating the minimum amount of heat source water flow rate through the heat source water minimum flow rate control unit 102 installed in the oil amount valve control unit 100 for controlling the opening degree of the oil amount valve 10 ( S1)

An installer or a user who installs an air conditioner can operate a plurality of dip switches 104 and 106 installed in the oil quantity valve control unit 100 and turn on and off a plurality of dip switches 104 and 106. By operation, the desired heat source minimum flow rate can be input.

When the minimum heat flow rate of the heat source water is operated as described above, a step (S2) of setting the control lower limit value according to the operated heat source water minimum flow rate may be performed.

According to the on / off state of the plurality of dip switches 104 and 106, the oil quantity valve control unit 100 may recognize a desired heat element minimum flow rate and set a control lower limit value.

 The oil quantity valve control unit 100 may set one of a plurality of control lower limits. The plurality of control lower limit values may be set between a minimum opening degree control value corresponding to the minimum opening degree of the oil displacement valve 10 and a maximum opening degree control value corresponding to the maximum opening degree of the oil displacement valve 10, and the plurality of control lower limit values may be set. It may be incrementally increased in value (eg 2V) intervals.

The oil quantity valve control unit 100 may be set to the control lower limit value of the oil quantity flow valve 10 by selecting one of the control lower limit values among the plurality of control lower limit values according to the on / off states of the plurality of dip switches 104 and 106. have.

  The control lower limit value may be set differently in the cooling operation and the heating operation, and when the same operation is input to the heat source minimum flow rate control unit 102, the control lower limit value in the heating operation may be set higher than the control lower limit value in the cooling operation. have.

The air conditioner may perform the step (S3) of controlling the oil quantity flow valve 10 above the set control lower limit. The oil amount valve control unit 100 may control the oil amount valve 10 within a set control lower limit value and a maximum opening degree control value range for controlling the oil amount amount valve 10 to the maximum opening degree. The oil quantity valve control unit 100 may control the oil quantity valve 10 according to the load of the outdoor unit in the control lower limit value and the maximum opening degree control value range.

2: indoor unit 4: outdoor unit
8: heat source flow path 10: oil pressure valve
12: indoor heat exchanger 16: indoor expansion mechanism
42: water refrigerant heat exchanger 44: compression
46: outdoor expansion mechanism 90: pump
100: oil flow valve control unit 102: minimum flow rate operation
104, 106: Dip switch 110: Main control unit

Claims (14)

An indoor unit having an indoor heat exchanger configured to exchange heat with indoor air;
An outdoor unit connected to the indoor unit and a refrigerant flow path, and having a water refrigerant heat exchanger configured to exchange heat between the refrigerant and water;
A heat source water flow passage connected to the water refrigerant heat exchanger;
A pump installed in the heat source water passage;
A oil displacement valve installed in the heat source water flow path and having an adjustable opening degree;
A oil quantity valve control unit for controlling the opening degree of the oil quantity valve,
The oil amount valve control unit includes a heat source water minimum flow rate operation unit for operating a minimum flow rate of the heat source water, and the air conditioner to adjust the opening degree of the oil flow rate valve in accordance with the operation of the heat source water minimum flow rate operation. The method of claim 1,
And the oil quantity valve control unit sets one of a plurality of control lower limit values when the heat source water minimum flow rate operation unit is operated. The method of claim 2,
And the plurality of control lower limit values are set between a minimum opening degree control value corresponding to the minimum opening degree of the oil quantity flow rate valve and a maximum opening amount control value corresponding to a maximum opening degree of the oil quantity flow rate valve. The method of claim 2,
The plurality of control lower limit values are increased step by step at set intervals. The method of claim 1,
And the heat source minimum flow rate control unit sets a lower control limit value of the oil displacement valve by a switching combination of a plurality of dip switches. The method of claim 5, wherein
And the heat source minimum flow rate control unit has a lower control limit value by a combination of switching of the plurality of dip switches during cooling operation and heating operation. The method according to claim 6,
And the heating source minimum flow rate control unit has a lower control limit in heating operation than a lower control limit in cooling operation when the switching combinations of the plurality of dip switches are the same in the cooling operation and the heating operation. Air conditioner with indoor unit and outdoor unit connected with refrigerant flow path, water refrigerant heat exchanger for heat exchange between refrigerant and water in outdoor unit, water source heat exchanger connected to water refrigerant heat exchanger, and variable flow rate valve with adjustable pump and opening in heat source water passage In the operation method of the air conditioner for driving the machine,
Operating a heat source water minimum flow rate through a heat source water minimum flow rate control unit installed in the oil flow rate valve control unit controlling the oil flow rate valve;
Setting a control lower limit value according to the minimum flow rate of the heat source water;
And operating the oil quantity valve by the oil quantity valve control unit being greater than or equal to the control lower limit value. The method of claim 8,
And the oil quantity valve control unit controls the oil quantity valve according to the load of the outdoor unit in the set control lower limit value and the maximum opening degree control value range for controlling the oil quantity valve. The method of claim 9,
And a plurality of the lower limit control values are set between a minimum opening control value corresponding to the minimum opening degree of the oil displacement valve and a maximum opening control value corresponding to the maximum opening degree of the oil displacement valve. 11. The method of claim 10,
And the oil quantity valve control unit sets one of a plurality of control lower limit values. The method of claim 11,
The plurality of control lower limit values are increased step by step at intervals of the set. The method of claim 8,
The control lower limit is a method of operating an air conditioner different in cooling operation and heating operation. The method of claim 8,
The control lower limit value is the operation method of the air conditioner, when the same operation is input to the said heat source water minimum flow volume operation part, the control lower limit value at the time of heating operation is higher than the control lower limit value at the time of cooling operation.

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