JP5516466B2 - Air conditioner outdoor unit - Google Patents

Description

  The present invention relates to an outdoor unit of an air conditioner, and more particularly to an outdoor unit of an air conditioner that can accurately control the operation of a plurality of fans provided in the outdoor unit.

  Conventionally, as an air conditioner installed in a building such as a condominium or a general house, an outdoor unit installed outdoors, and at least one indoor unit installed on an indoor ceiling or wall surface, connected to the outdoor unit by refrigerant piping There exists what has. Among these, some outdoor units include a refrigerant circuit in which a compressor, a heat exchanger, an expansion valve, and the like are sequentially connected by refrigerant piping, and two fans that are rotated by a fan motor. By rotating, outside air is taken into the outdoor unit, heat is exchanged between the refrigerant and the outside air in the heat exchanger, and then the outside air after heat exchange is discharged outside the outdoor unit (for example, Patent Document 1).

  In the outdoor unit having two fans as described above, when the air conditioner is performing a cooling operation, that is, when the outdoor unit heat exchanger functions as a condenser, When the fan is rotated, the amount of heat exchange in the heat exchanger increases, and the condensation capacity in the heat exchanger of the outdoor unit exceeds the operating capacity required for the indoor unit. In such a case, by rotating only one of the two fans, the amount of outside air taken into the outdoor unit is reduced, the amount of heat exchange in the heat exchanger is reduced, and one fan is By stopping, the power consumption of the outdoor unit is reduced.

  Selection of the fan to be rotated includes, for example, an outside air temperature sensor for detecting the outside air temperature, a large heat generation board such as an outdoor unit control board and a power supply board, and a large heat generation part such as a reactor and a power module. Select a fan located near the electrical component box. If a fan away from the outside air temperature sensor or the electrical component box is selected and rotated, there is a risk that the amount of outside air flowing around the outside air temperature sensor or around the electrical component box may decrease. If the flow rate of outside air decreases, the outside air temperature may not be detected accurately by the outside temperature sensor due to the heat released from the heat exchanger or the electrical component box, and the cooling efficiency of the electrical component box may also be reduced. descend. In order to prevent such a problem, when only one fan is rotated, the fan near the outside temperature sensor or the electrical component box is rotated.

JP 2009-85481 A (pages 5-6, FIG. 2)

  However, in the outdoor unit of the air conditioner described above, wiring for supplying drive power to the fan motor that rotates each of the two fans at the time of assembly in the factory or replacement of the fan motor in maintenance work (for example, There is a possibility that the connection of the power supply line connected to every two fan motors from the power supply board is wrong. If the wiring is wrong, the control unit of the air conditioner gives an operation instruction to the fan motor of this fan to rotate only the fan placed near the outside air temperature sensor or the electrical component box. The fan motor is driven and the other fan located far from the outside air temperature sensor and the electrical component box rotates, which may prevent accurate detection of the outside air temperature and proper cooling of the electrical component box. It was.

  The present invention solves the problems described above, and provides an outdoor unit of an air conditioner that can rotate a specific fan even if wiring to a fan motor that rotates a plurality of fans is wrong. The purpose is to do.

  In order to solve the above-described problems, an outdoor unit of an air conditioner according to the present invention includes a plurality of fan motors, a fan connected to each fan motor, a heat exchanger, and an outside air temperature detection that detects an outside air temperature. Means and control means for supplying drive power to the plurality of fan motors. Wiring is provided between the control means and the plurality of fan motors so that drive power can be supplied from the control means to each of the plurality of fan motors. The control means determines whether the connection state of the wiring for each of the plurality of fan motors is correct. It has a connection determination mode for determining. When it is determined that the wiring to the fan motor is incorrect as a result of the determination, the control means performs drive control of the fan motor in response to the wiring error.

  In the outdoor unit of the air conditioner of the present invention configured as described above, the control unit of the outdoor unit has a connection determination mode for determining the correctness of the connection state of the wiring for each fan motor. If it is determined that the wiring to the fan motor is incorrect, the fan motor drive control is performed in response to the wiring error. As a result, when you want to selectively drive a specific fan motor and rotate the corresponding fan, even if the wiring to the fan motor is incorrect, the desired fan motor can be driven reliably. Since the fan corresponding to this can be rotated, it is possible to accurately detect the outside air temperature and reliably cool the electrical component box.

It is an external appearance perspective view which shows the front side of the outdoor unit by this invention. It is an external appearance perspective view which shows the back side of the outdoor unit by this invention. It is a schematic perspective view which shows the internal structure of the outdoor unit by this invention. It is a control block diagram of the fan of the outdoor unit according to the present invention. It is a flowchart explaining the control at the time of the connection determination in the outdoor unit by this invention.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. As an example, an air conditioner configured by an outdoor unit and at least one or more indoor units connected to the outdoor unit by refrigerant piping, the outdoor unit having two fans is exemplified. Will be described. The present invention is not limited to the following embodiments, and can be variously modified without departing from the gist of the present invention.

  As shown in FIGS. 1 to 3, the outdoor unit 1 of the air conditioner according to the present embodiment has a substantially rectangular parallelepiped housing. The casing has a front panel 1a that mainly serves as one side panel by processing a steel plate, a rear panel 1d that also serves as the other side panel, a service panel 1m, a bottom plate 1h, a top plate 1n, and a front panel. It is comprised from the piping cover 1t and the side surface piping cover 1w. A part of the front panel 1a and the rear panel 1d and the lower ends of the front piping cover 1t and the side piping cover 1w are assembled to the flange around the bottom plate 1h by screws, and the upper ends of the front panel 1a and the rear panel 1d are attached to the ceiling. The top plate 1n is assembled to the front panel 1a and the back panel 1d by screws so as to be closed by the plate 1n.

  In the following description, in the case of the outdoor unit 1, the front panel 1 a arranged in FIG. 1 is the front surface, the opposite surface is the back surface, and the service panel 1 m is disposed when the front panel 1 a is viewed from the front. The explanation will proceed with the right side as the opposite side and the left side as the opposite side.

  The inside of the casing of the outdoor unit 1 is partitioned into an air blower chamber 10 and a machine chamber 11 by an upper partition plate 61 and a lower partition plate 50 that are partition plates. The blower chamber 10 is mainly provided with an upper fan 20a, a lower fan 20b, and a heat exchanger 30. The heat exchanger 30 is formed in a substantially L shape when viewed from above, and is disposed along the back surface from the left side surface of the casing of the outdoor unit 1. The upper fan 20a and the lower fan 20b are respectively attached to an upper fan motor 21a and a lower fan motor 21b, which will be described later, and the upper fan motor 21a and the lower fan motor 21b are vertically mounted on a motor support fixed to the heat exchanger 30. By being attached at a predetermined interval, the upper fan 20 a is disposed above the blower chamber 10 and the lower fan 20 b is disposed below the blower chamber 10.

  The machine room 11 accommodates a compressor, an accumulator, a four-way valve, and piping. An electrical component box 60 is disposed in the upper part of the machine room 11, and the electrical component box 60 is fixed to the lower partition plate 50 by a bottom plate 62 that receives the electrical component box 60. As shown in FIG. 3, the lower partition plate 50 is bent so as to protrude toward the blower chamber 10, one side end is fixed to the right end of the front panel 1 a, and the other side end is heat exchanger 30. Is a steel plate fixed to a pipe outlet on the back side (not shown), and the lower end is in contact with the bottom plate 1h.

  As shown in FIGS. 1 and 2, the front panel 1 a is a steel plate formed by bending the front surface of the outdoor unit 1 from the front surface to the left side surface in a substantially L shape when viewed from the top surface. It arrange | positions so that the whole left side surface of the air blower room 10 side and the outdoor unit 1 may be covered. On the front side of the front panel 1a, a circular opening is formed at a position corresponding to the upper fan 20a and the lower fan 20b, and the air sucked into the blower chamber 10 of the outdoor unit 1 by the upper fan 20a and the lower fan 20b. Two air outlets 1s that exhaust to the outside are provided, and a fan guard 1b is covered so as to cover each air outlet 1s. Moreover, the suction port 1q which consists of a some hole is provided in the left side surface side of the front panel 1a.

  The back panel 1d is a steel plate formed by bending the back surface of the outdoor unit 1 from the back to the right side so as to be substantially L-shaped when viewed from above, covering the back of the machine room 11 of the outdoor unit 1, and the right side of the outdoor unit 1 It arrange | positions so that the surface may be covered with the service panel 1m mentioned later. In addition, an intake hole 1f for taking outside air into the machine room 11 by an upper fan 20a and a lower fan 20b is opened in the lower part on the back side of the rear panel 1d.

  As shown in FIG. 1, the service panel 1 m is a steel plate formed by bending the front side to the right side of the outdoor unit 1 into a substantially L shape when viewed from the top, and covers the machine room 11 side of the outdoor unit 1. Moreover, it arrange | positions so that the right side surface of the outdoor unit 1 may be covered with the back panel 1d. The service panel 1m is detachably attached so that the machine room 11 can be easily accessed during maintenance work of the outdoor unit 1.

  As shown in FIG. 2, the rear side of the housing of the outdoor unit 1 is connected to the blower chamber 10 by an upper fan 20a and a lower fan 20b between the side edge of the rear panel 1d and the side edge of the front panel 1a. It is the back suction port 1e for taking in outside air. The heat exchanger 30 is exposed at the rear suction port 1e, and a protective member 1g is provided at the rear suction port 1e. In addition, an outside air temperature sensor 40 serving as an outside air temperature detecting means is attached to the back suction port 1e side of the heat exchanger 30 corresponding to the upper right side of the back surface suction port 1e by a spacer (not shown).

  As shown in FIG. 3, the bottom plate 1 h is a substantially rectangular steel plate, and a peripheral portion thereof has a flange bent upward at a substantially right angle. Moreover, the leg part 1c for extending in the front-back direction of the outdoor unit 1 and installing the outdoor unit 1 on the ground etc. is provided in the lower surface of the bottom plate 1h, respectively.

  As shown in FIGS. 1 and 2, the top plate 1n is a substantially rectangular steel plate, and the peripheral portion of the top plate 1n has a flange bent downward. The top plate 1n is assembled to each upper end of the front panel 1a, the service panel 1m, and the rear panel 1d by screws. Although not shown, a heat insulating material is attached to the back side of the top panel 1n on the electrical component box 60 side.

Next, referring to FIGS. 1 to 4, the outdoor unit 1 of the air conditioner in the present embodiment is based on a method and a determination result for determining whether the power line is connected to the upper fan motor 21a and the lower fan motor 21b. A specific method for driving the upper fan motor 21a and the lower fan motor 21b will be described.
It is assumed that the outdoor unit 1 in the present embodiment rotates both the upper fan 20a and the lower fan 20b during startup. Further, it is assumed that the outside air temperature detected by the outside air temperature sensor 40 is always taken in by the control means 100 and stored in time series.

  As shown in FIG. 4, the outdoor unit 1 includes a control in addition to the upper fan 20 a and the lower fan 20 b, the upper fan motor 21 a and the lower fan motor 21 b, the heat exchanger 30, and the outside air temperature sensor 40. Means 100 are provided. The control means 100 is provided on a control board (not shown) stored in the electrical component box 60. The control means 100 mainly inputs DC power from a power supply circuit (not shown) and separately supplies drive power to the upper fan motor 21a and the lower fan motor 21b. A power supply unit 120 that can supply or stop supply, and a CPU 110 that controls the power supply unit 120 and has a storage unit and a timer unit (not shown). The CPU 110 receives communication data including the control content of the outdoor unit 1 transmitted from the indoor unit, and also uses a pressure sensor and a temperature sensor (not shown) provided in the outdoor air temperature sensor 40 and the refrigerant circuit of the outdoor unit 1. Capture the detection value. The CPU 110 controls the driving of the upper fan motor 21a and the lower fan 21b via the power supply unit 120 based on the received or captured various information, and includes a compressor and various valves disposed in the machine room 11. To control.

  When the air conditioner is performing a cooling operation, the heat exchanger 30 of the outdoor unit 1 functions as a condenser. At this time, when the outside air temperature is low and the amount of heat exchange between the outside air and the refrigerant in the heat exchanger 30 is large, if the upper fan 20a and the lower fan 20b are rotated, the heat exceeding the operating capacity required for the indoor unit This is the amount of heat exchange in the exchanger 30. In such a state, only one of the upper fan 20a and the lower fan 20b is rotated to reduce the amount of outside air taken into the outdoor unit 1, thereby reducing the amount of heat exchange between the refrigerant and the outside air in the heat exchanger 30. However, since a sufficient amount of heat exchange can be obtained, the CPU 110 stops the operation of either the upper fan motor 21a or the lower fan motor 21b via the power supply unit 120.

  Specifically, the upper fan motor 21a and the lower fan motor 21b are respectively connected to the power supply unit 120 of the control means 100 through a power supply line (connection line for supplying driving power to the upper fan motor 21a and the lower fan motor 21b). As shown in FIG. 4, the CPU 110 supplies or stops supplying driving power to the upper fan motor 21 a or the lower fan motor 21 b via the power supply unit 120.

  In the CPU 110, the heat exchange amount in the heat exchanger 30 when the two fans are rotating is the heat exchange amount in the heat exchanger 30 that is equal to or higher than the operation capacity required in the indoor unit, and the upper fan If it is determined that either the motor 21a or the lower fan motor 21b can be operated, the supply of drive power to the lower fan motor 21b via the power supply unit 120 is stopped to stop the rotation of the lower fan 20b. Only the upper fan motor 21a is supplied with driving power to rotate only the upper fan 20a.

  The reason why only the upper fan 20a is rotated is as follows. As shown in FIG. 2, the outside air temperature sensor 40 is disposed above the rear suction port 1 e, and the electrical component box 60 is disposed above the machine room 11 as illustrated in FIG. 3. For this reason, when the rotation of the upper fan 20a is stopped, there is a possibility that the circulation amount of the outside air around the outside temperature sensor 40 and around the electrical component box 60 is lowered. When the circulation amount of the outside air around the outside air temperature sensor 40 and around the electrical component box 60 decreases, the heat released from the heat exchanger 30 and the electrical component box 60 stays around the outside air temperature sensor 40 and is caused by the accumulated heat. Due to the influence, the outside air temperature sensor 40 cannot accurately detect the outside air temperature, and the cooling efficiency of the electrical component box is also lowered. Therefore, when only one of the fans is rotated, the CPU 110 rotates only the upper fan 20a to ensure detection accuracy by the outside air temperature sensor 40 and efficiently cool the electrical component box 60.

  When the outdoor fan 1 is manufactured or when the upper fan motor 21a and the lower fan motor 21b are replaced in maintenance work, the operator mistakenly supplies the power line from the power supply board and the upper fan motor 21a or the lower fan motor 21b. If the connection with the fan is reversed, in the situation where only one of the fans is desired to rotate, only the unintended fan, that is, the lower fan 20b rotates.

  When the operation of the outdoor unit 1 is continued in this state, as described above, the circulation amount of the outside air around the outside temperature sensor 40 and around the electrical component box 60 is reduced, and the heat exchanger 30 and the electrical component box 60 The released heat stays around the outside air temperature sensor 40 and the outside air temperature sensor 40 cannot accurately detect the outside air temperature, and the cooling efficiency of the electrical component box also decreases.

  To avoid the above situation. The outdoor unit 1 of the present embodiment has a connection determination mode for determining whether the wiring to the upper fan motor 21a and the lower fan motor 21b is correct. When it becomes a situation where only one of the fans is rotated, that is, when only the upper fan motor 21a is rotated in this embodiment, the CPU 110 first determines whether or not it is necessary to execute the connection determination mode. To do.

  When the CPU 110 rotates only the upper fan motor 21a, the CPU 110 stops supplying the driving power to the lower fan motor 21b via the power supply unit 120 and stops the rotation of the lower fan 20b (only the upper fan 20a rotates). The latest outside air temperature is determined as the latest outside air temperature Tn out of the outside air temperatures taken in and stored from the outside air temperature sensor 40 when the upper fan 20a and the lower fan 20b are rotating together. Next, the CPU 110 rotates only the upper fan motor 21a, takes in the outside air temperature detected by the outside air temperature sensor 40, and stores it as the first outside air temperature T1. The CPU 110 continuously takes in the first outside air temperature T1, and the CPU 110 is not shown if the taken-in first outside air temperature T1 is higher than the latest outside air temperature Tn stored, for example, 10 ° C. or higher. Time measurement is started at the time measuring unit, and it is determined whether or not the state where the first outside air temperature T1 is equal to or higher than the latest outside air temperature Tn + 10 ° C. continues for a predetermined time, for example, 5 minutes. And CPU110 will perform connection determination mode, if the state where 1st external temperature T1 is more than the newest external temperature Tn + 10 degreeC continues for the predetermined time.

  The reason for monitoring the first outside air temperature T1 in order to determine whether or not it is necessary to execute the connection determination mode is as follows. That is, if the upper fan 20a is rotating, the outside air flows and the first outside air temperature T1 is equal to or lower than the latest outside air temperature Tn, but if the upper fan 20a is stopped, the heat exchanger 30 Thus, it is considered that the first outside air temperature T1 becomes higher than the latest outside air temperature Tn due to the air that has undergone heat exchange with the refrigerant and the heat that is radiated from the electrical component box 60. Therefore, if the state where the first outside air temperature T1 is equal to or higher than the latest outside air temperature Tn + 10 ° C. continues for a predetermined time, it can be determined that the wiring to both fans may be wrong.

  Specifically, the CPU 110 executes the connection determination mode as follows. The CPU 110 stops supplying the driving power to the upper fan motor 21a via the power supply unit 120 to stop the upper fan 20a, and starts supplying driving power to the lower fan motor 21b to rotate the lower fan 20b. At the same time, the time measuring unit of the CPU 110 starts time measurement. Then, the CPU 110 continues the above-described stop of the upper fan 20a and rotation of the lower fan 20b for a predetermined time, for example, 10 minutes after execution of the connection determination mode, and obtains the second temperature T2 from the outside air temperature sensor 40 after the predetermined time has elapsed. Capture and memorize. Then, the CPU 110 determines whether or not the second temperature T2 is equal to or lower than the latest outside air temperature Tn stored.

  In a state where the wiring between the power supply unit 120 and the upper fan motor 21a and the lower fan motor 21b is opposite, the CPU 110 stops the supply of driving power to the upper fan motor 21a via the power supply unit 120. If the supply of driving power to the lower fan motor 21b is started, the upper fan motor 21a is driven and the lower fan motor 21b is stopped, contrary to the control by the CPU 110. That is, the upper fan 20a rotates and the lower fan 20b stops.

  In such a state, outside air circulates around the outside air temperature sensor 40 and around the electrical component box 60, and heat is exchanged with the refrigerant in the heat exchanger 30, and the heat is released from the air and the electrical component box 60. Since heat is released to the outside of the outdoor unit 1, the second outside air temperature T2 detected by the outside air temperature sensor 40 becomes equal to or lower than the latest outside air temperature Tn. Thereby, CPU110 judges that the wiring of each fan motor and the power supply part 120 is wrong. The CPU 110 that has determined that the wiring is wrong instructs the power supply unit 120 to switch the control of each fan motor, that is, when only the upper fan 20a is to be rotated, the lower fan motor 21b is connected via the power supply unit 120. To supply driving power.

  As described above, when the control unit 100 of the outdoor unit 1 performs control to rotate only the upper fan 20a disposed above, the detected temperature T1 detected by the outside air temperature sensor 40 is the latest outside air for a predetermined time. If the temperature is higher than the temperature Tn by a predetermined temperature or more, the connection determination mode is executed to check the wiring between the power supply unit 120 and each fan motor. If this is wrong (opposite), the control to each fan motor is switched. Thus, the intended fan (which is to be rotated) can be reliably rotated. As a result, the outside air temperature sensor 40 can accurately detect the outside air temperature, and the electrical component box 60 can be efficiently cooled.

  In the embodiment described above, the outside air temperature sensor 40 and the electrical component box 60 are disposed above the blower chamber 10 of the outdoor unit 1, and when either one of the fans is rotated, only the upper fan 20a is used. Although the outdoor unit 1 to be rotated has been described as an example, the outdoor temperature sensor 40 and the electrical component box 60 are disposed below the blower chamber 10 of the outdoor unit 1, and when either one of the fans is rotated, It may be an outdoor unit that rotates only the lower fan 20b.

  Moreover, although the outdoor unit 1 has been described as an example in which two fans are provided, there are more fans than two, for example, three fans, and each of the fans In the case where the outside air temperature sensor 40 and the electrical component box 60 are arranged in any vicinity, one or two of the three units arranged in the vicinity of the outside air temperature sensor 40 or the electrical component box 60 are provided. The fan may be rotated.

  Next, the flow of processing when the connection determination mode is executed in the CPU 110 of the control unit 100 provided in the outdoor unit 1 of the present embodiment will be described using the flowchart shown in FIG. In the flowchart of FIG. 5, ST represents a step, and the subsequent numbers represent step numbers. In FIG. 5, the processing related to the present invention is mainly described, and description of processing in normal operation of the outdoor unit 1 such as compressor rotation speed control and various valve opening / closing control is omitted. .

  When the CPU 110 receives an operation start instruction from the indoor unit and starts operation, the CPU 110 rotates both the upper fan 20a and the lower fan 20b, and constantly takes in the outside air temperature detected by the outside air temperature sensor 40. First, CPU 110 determines whether or not the operation mode instruction from the indoor unit is a cooling operation (ST1). If the operation mode is not cooling operation (ST1-No), CPU 110 returns the process to ST1.

  If the operation mode is the cooling operation (ST1-Yes), the CPU 110 compares the heat exchange amount in the heat exchanger 30 when the two fans are rotating with the operation capability required in the indoor unit. Then, it is determined whether or not only the upper fan 20a needs to be rotated (ST2). If rotation of upper fan 20a and lower fan 20b is necessary (ST2-No), CPU 110 returns the process to ST1.

  If rotation of only the upper fan 20a is sufficient (ST2-Yes), the CPU 110 stops supplying the driving power to the lower fan motor 21b via the power supply unit 120 to stop the lower fan 20b and stores it. Of the outside air temperatures taken in when the two fans are rotating, the latest outside air temperature is determined as the latest outside air temperature Tn (ST3). Next, the CPU 110 starts taking in the first detected temperature T1 detected by the outside air temperature sensor 40 (ST4).

  Next, the CPU 110 determines whether or not the captured first detected temperature T1 is equal to or higher than the latest outside air temperature Tn + 10 ° C. (ST5). If the first detected temperature T1 is not equal to or higher than the latest outside air temperature Tn + 10 ° C. (ST5-No), the CPU 110 returns the process to ST5.

  If the first detected temperature T1 is equal to or higher than the latest outside air temperature Tn + 10 ° C. (ST5-Yes), the CPU 110 starts time measurement (ST6), and the first detected temperature T1 is equal to or higher than the latest outside air temperature Tn + 10 ° C. However, it is determined whether or not the measurement has continued for a predetermined time since the start of time measurement (ST7). If the predetermined time has not been continued (ST7-No), CPU 110 returns the process to ST1.

  If it has continued for a predetermined time (ST7-Yes), the CPU 110 stops supplying the driving power to the fan motor 20a via the power supply unit 120, stops the upper fan 20a, and drives the lower fan motor 21b. Is started to rotate the lower fan 20b, and time measurement is started (ST8).

  Next, CPU 110 determines whether or not a predetermined time has elapsed after performing the process of ST8 (ST9). If the predetermined time has not elapsed (ST9-No), CPU 110 returns the process to ST9. If the predetermined time has elapsed (ST9-Yes), the CPU 110 takes in the second detected temperature T2 detected by the outside air temperature sensor 40 (ST10), and the taken in second detected temperature T2 is equal to or lower than the latest outside air temperature Tn. It is determined whether or not there is (ST11). If the second detected temperature T2 is equal to or lower than the latest outside air temperature Tn (ST11-Yes), the CPU 110 determines that the wiring between the power supply unit 120 and each fan is incorrect, and switches the control of the fan (ST12). That is, when it is desired to rotate the upper fan 20a, the driving power is supplied to the lower fan motor 21b via the power supply unit 120. Then, CPU 110 returns the process to ST1.

  If the second detected temperature T2 is not equal to or lower than the latest outside air temperature Tn (ST11-No), the CPU 110 determines that the wiring to each fan is correct, and supplies driving power to the fan motor 20a via the power supply unit 120. Then, the upper fan 20a is rotated, and the supply of drive power to the lower fan motor 21b is stopped to stop the lower fan 20b (ST13). Then, CPU 110 returns the process to ST1.

  As described above, the outdoor unit for an air conditioner according to the present invention has a connection determination mode for determining whether the connection state of the wiring for each fan motor is correct. As a result of the determination, the wiring to the fan motor is incorrect. If it is determined, the fan motor drive control is performed in response to a wiring error. As a result, when you want to selectively drive a specific fan motor and rotate the corresponding fan, even if the wiring to the fan motor is incorrect, the desired fan motor can be driven reliably. Since the fan corresponding to this can be rotated, accurate detection of the outside air temperature and appropriate heat dissipation of the electrical component box can be performed.

DESCRIPTION OF SYMBOLS 1 Outdoor unit 1a Front panel 1b Fan guard 1c Leg part 1d Rear panel 1f Intake hole 1g Protection member 1h Bottom plate 10 Heat exchange chamber 11 Machine room 20a Upper fan 20b Lower fan 21a Upper fan motor 21b Lower fan motor 30 Heat exchanger 40 Outside air Temperature sensor 60 Electrical component box 100 Control means 110 CPU
120 Power supply

Claims (4)

A plurality of fan motors, fans connected to the respective fan motors, a heat exchanger, an outside air temperature detecting means for detecting an outside air temperature, and a control means for supplying driving power to the plurality of fan motors. Air conditioner outdoor unit,
Between the control means and the plurality of fan motors, wiring is made so that driving power can be supplied from the control means to each of the plurality of fan motors,
The control means have a determined connection determination mode correctness of the connection states of a plurality of said each fan motor wiring,
When selecting and driving some of the fan motors,
The latest outside temperature is determined as the latest outside temperature among the outside temperatures detected by the outside temperature detecting means when all the fan motors are driven,
The outdoor unit for an air conditioner, wherein the connection determination mode is executed when a first outside air temperature detected by the outside air temperature detecting means is equal to or higher than a temperature obtained by adding a predetermined temperature to the latest outside air temperature . When it is not necessary to drive all of the plurality of fan motors, the control means selects some of the fan motors arranged in the vicinity of the outside air temperature detection means and drives the fan motors. The outdoor unit of the air conditioner according to claim 1. The control means, when executing the connection determination mode, stops the selected several fan motors, drives all the other fan motors, and detects the second air temperature detected by the outside air temperature detecting means. 3. The outdoor unit for an air conditioner according to claim 1, wherein if the outside air temperature is equal to or lower than the latest outside air temperature, it is determined that the wiring to the fan motor is incorrect. 2. The control unit according to claim 1, wherein if the wiring to the fan motor is determined to be incorrect in the connection determination mode, the control unit performs drive control of the fan motor corresponding to the incorrect wiring. The outdoor unit of the air conditioner of Claim thru | or 3.