JP5448390B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner that performs preheating for heating.

  In an air conditioner equipped with a heat pump refrigeration cycle capable of cooling and heating, there is a problem that the start-up of heating is slow because the refrigerant and the indoor heat exchanger are cooled at the start of heating.

Therefore, an air conditioner that detects the temperature of the refrigerant in the refrigeration cycle while the operation is stopped and operates the compressor for a certain time when the detected temperature becomes lower than a predetermined value is known (for example, Patent Document 1). ).
Japanese Utility Model Publication No. 3-72270

In the above air conditioner, it is possible to suppress the temperature drop of the refrigerant in the refrigeration cycle by operating the compressor for a certain period of time.
However, it is difficult to perform rapid and high air volume heating only by suppressing the temperature drop of the refrigerant.

  The present invention takes the above circumstances into consideration, and an object thereof is to provide an air conditioner capable of rapid and high air volume heating.

The air conditioner of the invention according to claim 1 is a heat pump type refrigeration cycle capable of forming a heating flow path for returning refrigerant discharged from the compressor to the compressor through an indoor heat exchanger, an electronic expansion valve, and an outdoor heat exchanger. An indoor fan that circulates indoor air through the indoor heat exchanger, a heat exchanger temperature sensor that detects the temperature of the indoor heat exchanger, and a room temperature that is equal to or lower than a predetermined temperature during stoppage before starting heating When the preheating condition is entered into the preheating operation region where the outdoor temperature is equal to or lower than the predetermined temperature, the heating passage is formed while the compressor is in low capacity operation and the outdoor fan operation is started, and the indoor fan is operated and The low temperature operation of the compressor is turned on and off, and the opening temperature of the electronic expansion valve is controlled in accordance with the turning on and off, thereby maintaining the temperature detected by the heat exchanger temperature sensor within a predetermined range. Forecast A first control means for executing the operation, upon receiving an instruction for heating started during execution of the preheating operation, the compressor increases the ability of driving a low capacity, and sensing the temperature of the heat exchanger temperature sensor A second control means for operating the indoor fan at a low speed until reaching a set value, and when the detected temperature exceeds the set value, rapidly increasing the speed of the indoor fan and shifting to a heating operation; A third control unit that counts time, a fourth control unit that stops the preheating operation when the count time reaches a set time without an instruction to start heating, and during execution of the preheating operation And fifth control means for stopping the preheating operation when the preheating condition is not satisfied.

  According to the air conditioner of this invention, rapid and high air volume heating is possible.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the appearance of the indoor unit, and FIG. 2 shows a cross section of the interior of the indoor unit.
Reference numeral 1 denotes an indoor unit, which includes a front panel 1A that has a front surface curved in side view and forms an outer shell, and a rear main body on which components housed inside are arranged. A top suction port 2 is provided on the upper surface of the front panel 1A, a front suction port 3 is provided on the front surface of the front panel 1A, leaving a lower portion, and a blower outlet 4 is opened at the lower front surface of the front panel 1A.

  A grill 5 is fitted into the upper surface suction port 2, and the upper surface suction port 2 is always open. The front portion of the front panel 1A is rotatably opened and closed supported on the upper front end of the rear main body via a hinge portion (not shown) at the upper end here. Therefore, the lower end portion of the front panel 1A can be opened and closed with respect to the rear body.

  The front suction port 3 provided on the front surface of the front panel 1A is opened and closed by a movable panel 6 attached via a panel opening / closing mechanism K. That is, the movable panel 6 is opened by a forward protrusion based on the operation of the panel opening / closing mechanism K to form an indoor air suction passage, and the suction passage is closed by returning from the protrusion position.

  In addition, the movable panel 6 includes a transmissive display portion 6a at a portion corresponding to a display unit 20 described later. The transmissive display unit 6 a constitutes display means together with the display unit 20, and is formed of a light transmitting member. The transmissive display unit 6 a displays the display of the display unit 20 on the front side of the indoor unit 1.

  Inside the indoor unit 1, an indoor heat exchanger 9 formed by bending the front heat exchanger portion 9 </ b> A and the rear heat exchanger portion 9 </ b> B into a substantially inverted V shape is disposed. The front heat exchanger section 9A is formed in a curved shape at a position corresponding to the front panel 1A and the movable panel 6. The rear heat exchanger portion 9B is provided at an inclination at a position corresponding to the upper surface suction port 2.

  The electrostatic precipitator 10 is attached to the front side of the front heat exchanger section 9A. The electric dust collector 10 operates as an ozone generator in addition to the original dust collecting operation. A filter 11 is interposed between the indoor heat exchanger 9 and the front suction port 3 and the upper suction port 2. If the front panel 1 </ b> A is opened together with the movable panel 6, the filter 11 can be easily inserted into and removed from the indoor unit 1. Although not shown, a cleaning unit that automatically cleans dust adhering to the filter 11 is provided.

  An indoor fan 12 is disposed between the front and rear indoor heat exchangers 9A and 9B of the indoor heat exchanger 9 and facing the air outlet 7. The indoor fan 12 is a so-called cross-flow fan, has an axial dimension substantially the same as the width dimension of the indoor heat exchanger 9, and circulates indoor air through the indoor heat exchanger 9.

  The lower end portion of the front heat exchanger 9A is placed on the front drain pan 13a, and the lower end portion of the rear heat exchanger portion 9B is placed on the rear drain pan 13b, receiving drain water dripping from each heat exchanger, Can be drained. The outer surfaces of the side walls of the front and rear drain pans 13a and 13b are provided at positions close to the indoor fan 12, and constitute a nose n for the indoor fan 12.

  A partition wall member 14 connects the side wall portions of the front and rear drain pans 13a and 13b constituting the nose n and each side portion of the outlet 4. A space surrounded by the partition wall member 14 becomes a blowout air passage 15 that communicates the nose n and the blowout port 4.

  An upper and lower louver 7 </ b> A and a left and right louver 7 </ b> B are provided at the outlet 4 that opens at the end of the blowout air passage 15. Here, a plurality of left and right louvers 7B connected to each other via an operating mechanism are supported on one upper and lower louvers 7A. The upper and lower louvers 7A and the left and right louvers 7B are also mechanically connected to each other via a drive mechanism and a drive source (not shown).

FIG. 3 shows the indoor unit in operation, and FIG. 4 partially shows an internal configuration of the indoor unit.
The movable panel 6 has a cross-sectional shape curved along the vertical direction. In FIG. 3, the panel opening / closing mechanism K is provided only on one side (right side) of the front panel 1A in the left-right width direction and supports the movable panel 6 from the back side. Panel opening / closing mechanisms K are provided on both sides in the direction, and support both sides of the movable panel 6.

  The panel opening / closing mechanism K includes a drive shaft connected to the drive motor via a speed reduction mechanism, and a link mechanism body. The link mechanism is a parallel link mechanism including a fixed arm, a drive arm and a driven arm, and an auxiliary arm rotatably connected to the drive arm and the driven arm. Is provided with an auxiliary link mechanism.

Depending on the operation mode selected by the operation of the remote controller 100 described later, the opening posture of the movable panel 6 differs.
For example, when the dehumidifying operation mode is selected, the panel opening / closing mechanism K slightly protrudes the movable panel 6 from the front panel 1A, and the front suction port 3 is in a half-open state. In this state, the indoor fan 12 operates and the upper and lower louvers 7A are set upward, so that a so-called short circuit is formed in which the blowing air circulates in the shortest path from the outlet 4 to the upper surface inlet 2.

  When the cooling operation mode or the heating operation mode is selected, the panel opening / closing mechanism K causes the movable panel 6 to protrude from the front panel 1A to the maximum, and the front suction port 3 is fully opened. At this time, the lower end and the upper end of the movable panel 6 are higher than the lower end and the upper end of the front suction port 3, and the movable panel 6 is inclined with the upper end protruding forward from the lower end.

  In addition, when the cooling operation mode is selected, the upper and lower louvers 7A are inclined so as to face almost in the horizontal direction. When the heating operation mode is selected, the upper and lower louvers 7A are directed almost directly downward. In both the cooling and heating operations, the plurality of left and right louvers 7B are rotationally driven while being parallel to each other.

  A display unit 20 including a liquid crystal panel (or an organic EL panel) and a light emitting diode (LED) is attached to the inner surface side of the movable panel 6 and inside one (right side) panel opening / closing mechanism K. The display unit 20 displays the power consumption of the air conditioner and various information related to the power consumption, and displays the current time, the room temperature, the outside temperature, and the like as necessary. The display screen of the display unit 20 is transmitted through the transmissive display portion 6a of the movable panel 6 and presented to the user in the room.

  FIG. 5 shows the display unit 20 and its holding mechanism. The lead wire protection structural component H includes a lower case 22 connected to the display unit 20 via a first bent portion 21, an upper case 23 that forms an internal space with the lower case 22 and is slidably fitted. A lead wire guide accommodated in the lower case 22 and the upper case 23 is provided.

  Further, the lead wire protection structural component H is connected to the upper case 23 via the second bent portion 25, and is connected and fixed integrally with the guide member 26 so as to be rotatable on the front panel 1A. The hinge member 27 is supported.

  The heat pump refrigeration cycle shown in FIG. 6 is mounted on the indoor unit 1 and the outdoor unit (not shown) having such a configuration. Reference numeral 40 denotes a two cylinder type compressor having two cylinders 41 and 42. During cooling, the refrigerant discharged from the compressor 40 flows to the indoor heat exchanger 9 through the four-way valve 43, and the refrigerant passing through the indoor heat exchanger 9 passes through an electronic expansion valve (pulse motor valve; PMV) 44. To the outdoor heat exchanger 45. The refrigerant that has passed through the outdoor heat exchanger 45 is sucked into the cylinder 41 via the four-way valve 43 and the accumulator 47, and part of the refrigerant that has passed through the accumulator 47 is sucked into the cylinder 42 via the switching valve 48 and the buffer tank 49. Be turned. That is, a cooling channel is formed. An outdoor fan 46 is provided in the vicinity of the outdoor heat exchanger 45.

  During heating, the four-way valve 43 is reversed so that the refrigerant discharged from the compressor 40 flows through the four-way valve 43 to the outdoor heat exchanger 45 as indicated by the broken arrow, and the outdoor heat exchanger 45 The refrigerant that has passed through flows through the electronic expansion valve 44 to the indoor heat exchanger 9. The refrigerant that has passed through the indoor heat exchanger 9 is sucked into the cylinder 41 via the four-way valve 43 and the accumulator 47, and part of the refrigerant that has passed through the accumulator 47 is sucked into the cylinder 42 via the switching valve 48 and the buffer tank 49. Be turned. That is, a heating channel is formed.

  The switching valve 48 forms a refrigerant flow path connecting the accumulator 47 and the buffer tank 49 as shown in the figure when the compressor 40 is operated in two cylinders, and when the cylinder 42 of the compressor 40 is in the idling state, As shown in FIG. 7, a refrigerant flow path is formed in which part of the refrigerant discharged from the compressor 40 returns to the cylinder 42 while blocking the refrigerant flow path connecting the accumulator 47 and the buffer tank 49.

  On the other hand, one side portion of the indoor heat exchanger 9 is arranged with a gap from the side plate of the indoor unit 1, and the electric component box 16 is arranged in this gap. The electric component box 16 accommodates the indoor substrate 50, the light transmitting / receiving substrate 70, and the display substrate 80 shown in FIG.

  The indoor board 50 is connected to the commercial AC power supply AC, takes in the AC voltage of the commercial AC power supply AC into the power supply circuit 52 through the power switch 51, and supplies the AC voltage of the commercial AC power supply AC through the power relay 53. It sends out to the outdoor substrate 200 of the outdoor unit. The power supply circuit 52 steps down and rectifies the AC voltage taken in, and outputs it as operating voltages for the indoor substrate 50, the light transmitting / receiving substrate 70 and the display substrate 80.

  An indoor control unit (MCU) 60, drive circuits 61, 62, 63, 64, 65, and a serial circuit 66 are mounted on the indoor substrate 50. The indoor control unit 60 controls the entire air conditioner together with an outdoor control unit 203 (described later) on the outdoor substrate 200 by transmitting and receiving data to and from the outdoor substrate 200 via the serial circuit 66. The drive circuit 61 drives the upper and lower louvers 7A, the left and right louvers 7B, and the movable panel 6. The drive circuit 62 drives the electric dust collector 10 and the filter 11. The drive circuit 63 drives the light transmission / reception unit 71 on the light transmission / reception substrate 70. The drive circuit 64 drives the display unit 20 on the display substrate 80. The drive circuit 65 drives the fan motor 12M of the indoor fan 12 at a variable speed.

  In addition, a sensor group 67, a panel detector 68, and a filter detector 69 are connected to the indoor control unit 60. The sensor group 67 includes an indoor temperature sensor that detects the indoor temperature TA, a heat exchanger temperature sensor that detects the temperature TC of the indoor heat exchanger 9, and a refrigerant temperature sensor that detects the temperature TCJ of the refrigerant flowing out of the indoor heat exchanger 9. And an indoor humidity sensor for detecting indoor humidity. The panel detector 68 detects opening / closing of the movable panel 6. The filter detector 69 detects insertion / removal of the filter 11.

  The light transmission / reception unit 71 receives infrared light for operation emitted from a remote controller (also referred to as a remote controller) 100 and emits infrared light for data transmission to the remote controller 100.

  As shown in FIG. 9, the remote controller 100 includes a liquid crystal display unit 101, a temperature adjustment button 102, an automatic button 103, a cooling button 104, a stop button 105, a dehumidifying button 106, a heating button 107, an airflow button 108, and an open / close cover ( It has an operation surface 110 inside (not shown).

  The liquid crystal display unit 101 is for displaying various operating conditions and various information relating to driving, and in particular, has a dot pattern screen 101a for displaying dot patterns of various images. The temperature adjustment button 102 is for setting a target value of the room temperature. The automatic button 103 is for setting an automatic operation mode in which operation modes such as cooling, heating, and dehumidification are automatically selected and executed. The cooling button 104 is for setting the cooling operation, the stop button 105 is for stopping the operation, the dehumidifying button 106 is for setting the dehumidifying operation, and the heating button 107 is for setting the heating operation. The airflow button 108 is used to set the airflow direction of the blowing air, and various airflow patterns are switched and displayed on the dot pattern screen 101a for each operation.

  On the operation surface 110, there are a timer button 111 for setting a time until operation stop, an “information” button 112 for information guidance, a wind direction button 113 for switching the up / down wind direction and the left / right wind direction, and operation of the electric dust collector 10. An air clean button 114 for setting, an air volume button 115 for setting the blown air volume, a swing button 116 for setting the swing of the upper and lower louvers 7A, a preheat button 117 for setting a preheating operation for heating, and an operation A timer off button 118 for setting a reservation time for stopping, a button with a timer 119 for setting a reservation time for starting operation, a reservation button 120 for determining these reservation times, a menu button 121, and a cancel button 122 are provided. Is provided.

  On the other hand, as shown in FIG. 10, a power supply circuit 201, an outdoor control unit (MCU) 203, and drive circuits 204, 205, 206, 207, 208 are mounted on the outdoor board 200 of the outdoor unit. The power supply circuit 201 converts the AC voltage supplied from the indoor board 50 into an operating voltage for the outdoor board 200 and outputs the converted voltage. The drive circuit 204 drives the electronic expansion valve 44. The drive circuit 205 drives the switching valve 48. The drive circuit 206 drives the compressor motor 40M of the compressor 40 at a variable speed. The drive circuit 207 drives the four-way valve 43. The drive circuit 208 drives the fan motor 46M of the outdoor fan 46 at a variable speed.

  A sensor group 209 is connected to the outdoor control unit 203. The sensor group 209 detects the temperature of the refrigerant discharged from the compressor 40, the temperature of the refrigerant discharged from the compressor 40, the temperature of the refrigerant sucked into the compressor 40, and the temperature of the outdoor heat exchanger 45. A heat exchanger temperature sensor that detects the outdoor temperature, and an outdoor air temperature sensor that detects the outdoor temperature TO.

  And the indoor control part 60 and the outdoor control part 203 have the following means (1)-(7) as main functions regarding a preheating driving | operation.

  (1) When the preheating condition based on the indoor temperature TA detected by the indoor temperature sensor of the sensor group 67 and the outdoor temperature TO detected by the outdoor temperature sensor of the sensor group 209 is satisfied, the compressor 40 is operated at a low capacity (operating cylinder). Control means for performing a preheating operation for maintaining the temperature (detected temperature of the heat exchanger temperature sensor) TC of the indoor heat exchanger 9 within a certain range by forming a heating flow path of the heat pump refrigeration cycle while reducing the number).

  (2) Control means for operating the indoor fan 12 at an extremely low speed during the preheating operation and forming a short circuit in which the blown air circulates in the shortest path from the blower outlet 4 to the upper surface suction inlet 2.

  (3) Control means for notifying that effect by displaying the display unit 20 during execution of the preheating operation.

  (4) When an instruction to start heating is received from the remote controller 100 during the preheating operation, the capacity of the compressor 40 is increased and the indoor fan is detected until the detected temperature TC of the heat exchanger temperature sensor reaches the set value TCx. 12 is a control means that operates 12 at a low speed, and when the detected temperature TC exceeds a set value TCx, the speed of the indoor fan 12 is rapidly increased to shift to a heating operation.

  (5) Control means for counting time t1 during execution of the preheating operation.

  (6) Control means for stopping the preheating operation when the count time t1 reaches the set time t1x without an instruction to start heating from the remote controller 100.

  (7) Control means for stopping the preheating operation when the preheating condition is not satisfied during execution of the preheating operation.

Next, the operation will be described with reference to the flowchart of FIG.
When the indoor temperature TA detected by the indoor temperature sensor is, for example, 15 ° C. or lower and the outdoor temperature TO detected by the outdoor air temperature sensor is, for example, 10 ° C. or lower, the preheating condition is established. However, while the low-capacity operation of the compressor 40 (one-cylinder operation) and the operation of the outdoor fan 46 are started, the four-way valve 43 is reversed to form the heating flow path of the heat pump refrigeration cycle, Preheating operation is started (step 302).

  In this case, as shown in FIG. 14, the low-capacity operation by one cylinder of the compressor 40 is turned on and off (interrupted), and the opening degree of the electronic expansion valve 44 is controlled in accordance with the on and off. The temperature of the indoor heat exchanger 9 (detected temperature of the heat exchanger temperature sensor) TC is maintained within a predetermined range. When controlling the opening of the electronic expansion valve 44, an initial opening (number of drive pulses; 60 pls) is first set at the start of preheating, and then the temperature TCJ of the refrigerant flowing out of the indoor heat exchanger 9 (detection of the refrigerant temperature sensor). The degree of opening is increased or decreased so that the degree of superheat (superheat amount) SH, which is the difference between the temperature) and the heat exchanger temperature TC, becomes a constant value.

  During this preheating operation, the indoor fan 12 is operated at an extremely low speed, and as shown in FIG. 13, a short circuit is formed for circulating the blown air along the shortest path from the outlet 4 to the upper surface inlet 2.

  During the preheating operation, the characters “in preheating” are displayed on the display unit 20, and the display is transmitted through the transmission display portion 6a of the movable panel 6 (step 303). The user in the room can accurately know that the preheating operation is being performed by viewing the transmission display of the transmission display unit 6a. Also, with the start of the preheating operation, the time count t1 is started (step 304).

  During the preheating operation, when an instruction to start heating is issued from the remote controller 100 (YES in step 305), the capacity of the compressor 40 is increased (step 306), and the indoor fan 12 is operated at a low speed (step 306). 306). At the same time, the “preheating” display on the display unit 20 is canceled (step 308), and the time count t1 is cleared (step 309).

  At this time, if the temperature TC of the indoor heat exchanger 9 is equal to or lower than the set value TCx (YES in step 310), the low speed operation of the indoor fan 12 is continued (step 311).

  Thereafter, when the temperature TC of the indoor heat exchanger 9 rises and exceeds the set value TCx (NO in step 310), the speed of the indoor fan 12 is rapidly increased, and the heating operation is started (step 312).

  Thus, when the temperature TC of the indoor heat exchanger 9 is sufficiently increased, the speed of the indoor fan 12 is rapidly increased, so that a large amount of hot air having a sufficiently high temperature is blown into the room for heating. Quick and comfortable heating is implemented. Thereafter, the capacity of the compressor 40 is controlled according to the air conditioning load (difference between the room temperature TA and the target value), and the speed of the indoor fan 12 is adjusted according to the operation of the remote controller 100.

  If the remote controller 100 issues a heating stop instruction during the heating operation (YES in step 313), the compressor 40, the outdoor fan 46, and the indoor fan 12 are stopped and the four-way valve 43 is returned. Then, the heating operation is stopped (step 314).

  By the way, after starting the preheating operation, the remote controller 100 does not give an instruction to start heating (YES in Step 305), and when the count time t1 reaches the set time t1x (YES in Step 315), the power consumption is suppressed. Therefore, the operation of the compressor 40, the outdoor fan 46, and the indoor fan 12 is stopped, the four-way valve 43 is returned, and the preheating operation is stopped (step 316).

  Along with the stop of the preheating operation, the time count t2 is started (step 317), and the stop of the preheating operation is forced until the time count t2 is less than the predetermined time t2x for preventing re-preheating (NO in step 318). (Step 316). Thereafter, when the time count t2 reaches the predetermined time t2x (YES in step 318), the time count t2 is cleared (step 319), and the forced stop state of the preheating operation is released. That is, it is possible to avoid the problem that the preheating operation is frequently stopped and started.

  When the preheating condition is not satisfied during the preheating operation (NO in step 301), the preheating operation is prohibited at that time (step 320). Also in this case, as described above, the time count t2 can avoid the problem that the preheating operation is frequently stopped and started.

  As described above, when the preheating condition is satisfied, a preheating operation is performed in which the heating flow path of the heat pump refrigeration cycle is formed and the temperature TC of the indoor heat exchanger 9 is maintained within a certain range while the compressor 40 is operated at a low capacity. Then, when an instruction to start heating is received, the capacity of the compressor 40 is increased, and the indoor fan 12 is operated at a low speed until the detected temperature TC of the heat exchanger temperature sensor reaches the set value TCx. When the TC exceeds the set value TCx, the speed of the indoor fan 12 is rapidly increased to shift to the heating operation, whereby rapid and high air volume heating is possible.

  In addition, during the preheating operation, a short circuit is formed in which the blown air circulates through the shortest path from the outlet 4 of the indoor unit 1 to the upper surface inlet 2, so that the heat is gradually radiated around the indoor unit 1. . This radiation can improve the heating efficiency.

  Since the preheating operation is stopped when the set time t1x based on the time count t1 has passed without the instruction to start heating after the start of the preheating operation, unnecessary power consumption is eliminated and an energy saving effect is obtained.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments.

The external appearance perspective view of the indoor unit in one Embodiment of this invention. The figure which shows the internal structure of the indoor unit in one Embodiment in cross section. The perspective view which shows the state which the movable panel of the indoor unit in one Embodiment protruded. The perspective view which shows the structure of the display unit of the indoor unit in one Embodiment, and its peripheral part. The perspective view which shows the structure of the holding mechanism of the display unit in one Embodiment. The figure which shows the structure of the heat pump type | mold refrigerating cycle in one Embodiment, and 2 cylinder operation | movement of a compressor. The figure which shows 1 cylinder operation | movement of the compressor in one Embodiment. The block diagram which shows the control circuit of the indoor unit in one Embodiment. The figure which shows the remote controller in one Embodiment. The block diagram which shows the control circuit of the outdoor unit in one Embodiment. The flowchart for demonstrating the effect | action of one Embodiment. The figure which shows the preheating operation area | region in one Embodiment. The figure which shows the short circuit of the indoor unit and pre-heating display in one Embodiment. The figure which shows the driving | operation ON / OFF of the compressor at the time of the preheating driving | operation in one Embodiment, and the opening degree change of an electronic expansion valve.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Indoor unit, 2 ... Upper surface inlet, 3 ... Front inlet, 4 ... Air outlet, 6 ... Movable panel, 6a ... Transmission display part, 9 ... Indoor heat exchanger, 12 ... Indoor fan, 20 ... Display unit, DESCRIPTION OF SYMBOLS 40 ... Compressor, 45 ... Outdoor heat exchanger, 46 ... Outdoor fan, 48 ... Switching valve, 60 ... Indoor control part, 65 ... Drive circuit, 100 ... Remote controller, 101 ... Liquid crystal display part, 101a ... Dot pattern screen, 102 ... Temperature control button, 112 ... "Tell me" button, 121 ... Menu button, 203 ... Outdoor control unit, 206, 208 ... Drive circuit

Claims (4)

A heat pump refrigeration cycle capable of forming a heating flow path for returning the refrigerant discharged from the compressor to the compressor through an indoor heat exchanger, an electronic expansion valve, and an outdoor heat exchanger;
An indoor fan for circulating indoor air through the indoor heat exchanger;
A heat exchanger temperature sensor for detecting the temperature of the indoor heat exchanger;
When preheating conditions are established in a preheating operation region where the indoor temperature is equal to or lower than the predetermined temperature and the outdoor temperature is equal to or lower than the predetermined temperature during the stop before the start of heating, the compressor is started to operate at a low capacity and an outdoor fan. The heat exchanger temperature is formed by forming a heating flow path and operating the indoor fan and turning on / off the low-capacity operation of the compressor and controlling the opening of the electronic expansion valve in accordance with the turning on / off. First control means for performing a preheating operation for maintaining the temperature detected by the sensor within a predetermined range;
When an instruction to start heating is received during the preheating operation, the capacity of the compressor is increased from the low capacity operation, and the indoor fan is lowered until the temperature detected by the heat exchanger temperature sensor reaches a set value. A second control means that operates at a speed and rapidly increases the speed of the indoor fan when the detected temperature exceeds a set value and shifts to a heating operation;
Third control means for counting time during execution of the preheating operation;
A fourth control means for stopping the preheating operation when the count time reaches a set time without an instruction to start heating;
Fifth control means for stopping the preheating operation when the preheating condition is not satisfied during execution of the preheating operation;
An air conditioner comprising: The compressor has a plurality of cylinders;
The first control means reduces the number of operating cylinders of the compressor when operating the compressor at a low capacity.
The air conditioner according to claim 1. An indoor unit that houses at least the indoor heat exchanger and the indoor fan, sucks indoor air from a suction port by operation of the indoor fan, and blows the sucked air through the indoor heat exchanger into a room from a blowout port. ,
A sixth control means for forming a short circuit in which the blown air circulates in a shortest path from the blowout port to the suction port during execution of the preheating operation during the stop before the heating starts;
The air conditioner according to claim 1 or 2, further comprising: A seventh control means for notifying that during execution of the preheating operation during stoppage before the start of heating;
The air conditioner according to any one of claims 1 to 3, further comprising:

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