KR20030044419A - Air conditioner and therof control method - Google Patents
Air conditioner and therof control method Download PDFInfo
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- KR20030044419A KR20030044419A KR1020010075153A KR20010075153A KR20030044419A KR 20030044419 A KR20030044419 A KR 20030044419A KR 1020010075153 A KR1020010075153 A KR 1020010075153A KR 20010075153 A KR20010075153 A KR 20010075153A KR 20030044419 A KR20030044419 A KR 20030044419A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0043—Indoor units, e.g. fan coil units characterised by mounting arrangements
- F24F1/005—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted on the floor; standing on the floor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/009—Indoor units, e.g. fan coil units characterised by heating arrangements
- F24F1/0093—Indoor units, e.g. fan coil units characterised by heating arrangements with additional radiant heat-discharging elements, e.g. electric heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/37—Resuming operation, e.g. after power outages; Emergency starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/34—Heater, e.g. gas burner, electric air heater
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/54—Heating and cooling, simultaneously or alternatively
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
Description
본 발명은 공기조화기 및 그 제어방법에 관한 것으로, 더 상세하게는 냉매 압력이 저하되어 저압스위치가 오프되더라도 실내기에 전원을 공급하여 전기히터를 이용한 난방운전을 수행할 수 있도록 한 공기조화기 및 그 제어방법에 관한 것이다.The present invention relates to an air conditioner and a control method thereof, and more particularly, to an air conditioner capable of performing a heating operation using an electric heater by supplying power to an indoor unit even when a low pressure switch is turned off due to a decrease in refrigerant pressure. The control method is related.
일반적으로 종래 기술에 의한 공기조화기는 냉방시에는 냉매사이클을 사용하여 냉방을 수행하고, 난방시에는 전기히터를 사용하여 난방을 수행한다.In general, an air conditioner according to the prior art performs cooling using a refrigerant cycle when cooling, and performs heating using an electric heater when heating.
이러한 종래 기술에 의한 공기조화기의 실내기는 도 1에 도시한 바와 같이 실내공기를 흡입하고 토출하기 위하여 본체(1)의 전면 하부와 상부에 형성된 흡입구(2) 및 토출구(4)와, 상기 흡입구(2)를 통해 흡입되는 실내공기 중에 부유하는 이물질 등을 걸러내기 위해 흡입구(2)의 뒤쪽에 설치된 공기필터(3)와, 상기 토출구(4)를 통해 토출되는 공기를 상하 및 좌우 방향으로 풍향조절하도록 토출구(4)에 장착된 풍향조절날개(6)와, 상기 흡입구(2)를 통해 실내공기를 흡입하여 실내로 토출되도록 덕트(8)내에 장착된 실내팬모터(7)와, 상기 흡입구(2)의 뒤쪽에 설치되어 상기 흡입구(2)를 통해 흡입된 공기를 열교환하여 냉방하는 실내열교환기(5)와, 상기 덕트(8)의 상부에 장착되어 상기 흡입구(2)를 통해 흡입된 공기를 열교환하여 난방하는 전기히터(9)로 이루어져 있다.The indoor unit of the air conditioner according to the prior art, as shown in FIG. 1, the suction port 2 and the discharge port 4 formed in the lower and upper front of the main body 1 to suck and discharge the indoor air, and the suction port The air filter 3 installed at the rear of the suction port 2 and the air discharged through the discharge port 4 in the up and down and left and right directions to filter the foreign matter floating in the indoor air sucked through the (2) Wind direction control blade 6 mounted to the discharge port 4 to adjust, the indoor fan motor 7 mounted in the duct 8 to suck the indoor air through the suction port (2) and discharge it into the room, and the suction port Installed at the rear of the (2) and the indoor heat exchanger (5) for cooling by heat-exchanging the air sucked through the inlet (2), and is mounted on the upper portion of the duct (8) and sucked through the inlet (2) It consists of an electric heater (9) that heats and heats air have.
또한, 종래 기술의 공기조화기는 냉매 압력이 저하되어 압축기가 손상되는 것을 방지하기 위해 압축기 흡입측에 설치되는 저압스위치(low pressure switch)를 구비하고 있다.In addition, the air conditioner of the prior art is provided with a low pressure switch is installed on the compressor suction side to prevent the refrigerant pressure is lowered to damage the compressor.
도 2를 참고하여, 외부 전원(10)과 실내기 사이에 연결된 파워릴레이(11)의 코일에 저압스위치(12)를 직렬 연결하고, 상기 저압스위치(12)의 작동에 의해 파워릴레이(11)의 접점이 온 또는 오프되어 전원을 공급 또는 차단한다. 일예로 압축기 흡입측 냉매 압력이 기준압력 보다 높은 상태에서 저압스위치(12)가 온됨에 따라파워릴레이(11)의 코일로 구동전원(+12V)을 공급하고, 압축기 흡입측 냉매 압력이 기준 압력이하로 저하되면 저압스위치(12)가 오프됨에 따라 파워릴레이(11)의 코일로 공급되는 구동전원(+12V)을 차단한다.Referring to FIG. 2, the low pressure switch 12 is connected in series to the coil of the power relay 11 connected between the external power source 10 and the indoor unit, and the operation of the power relay 11 is performed by the low pressure switch 12. The contacts are turned on or off to supply or disconnect power. For example, when the low pressure switch 12 is turned on while the compressor suction side refrigerant pressure is higher than the reference pressure, the driving power supply (+ 12V) is supplied to the coil of the power relay 11, and the compressor suction refrigerant pressure is below the reference pressure. When the low pressure switch 12 is turned off, the driving power (+ 12V) supplied to the coil of the power relay 11 is cut off.
상기 저압스위치(12)가 온상태를 유지할 경우 실내기마이콤(13)이 전기히터 구동부(14)를 제어하여 전기히터(9)를 구동시킴으로써 난방운전을 수행할 수 있다.When the low pressure switch 12 is kept in the on state, the indoor unit microcomputer 13 may control the electric heater driving unit 14 to drive the electric heater 9 to perform a heating operation.
그러나 종래 기술에 따르면 냉매 압력이 저하되어 압축기 흡입측에 설치된 저압스위치가 오프되면 이와 연동하여 파워릴레이가 오프되어 실내기로 공급되는 전원이 차단되기 때문에 전기히터를 이용한 난방운전을 수행하지 못하는 문제점이 있었다.However, according to the related art, when the low pressure switch installed on the compressor suction side is turned off due to a decrease in the refrigerant pressure, the power relay is turned off in connection with this, and thus the power supplied to the indoor unit is cut off, thereby preventing the heating operation using the electric heater. .
즉, 겨울철과 같이 외기온도가 낮은 경우에는 통상적으로 냉방운전을 실시하지 않기 때문에 압축기를 보호하기 위해 저압스위치를 작동시킬 필요가 없음에도 불구하고 낮은 외기온도에서 냉매 압력이 저하되어 저압스위치를 작동시킴에 따라 전기히터를 이용한 난방운전을 실시할 수 없었다.In other words, when the outside air temperature is low, such as in winter, the cooling operation is not normally performed. However, even though it is not necessary to operate the low pressure switch to protect the compressor, the low pressure air pressure lowers the refrigerant pressure to operate the low pressure switch. Therefore, heating operation using an electric heater could not be performed.
본 발명은 전술한 기술 배경하에서 안출한 것으로, 본 발명의 목적은 혹한기 냉매 압력이 저하되어 저압스위치가 오프되더라도 실내기로 전원을 공급함으로써 전기히터에 의한 난방운전을 수행할 수 있도록 한 공기조화기 및 그 제어방법을 제공함에 있다.The present invention has been made in view of the above-described technical background, and an object of the present invention is to provide an air conditioner capable of performing a heating operation by an electric heater by supplying power to an indoor unit even when a low-temperature switch is turned off due to a cold refrigerant pressure. The control method is provided.
도 1은 일반적인 공기조화기의 실내기의 단면도이다.1 is a cross-sectional view of an indoor unit of a general air conditioner.
도 2는 종래 기술에 따른 공기조화기의 회로구성도이다.2 is a circuit diagram of a conventional air conditioner.
도 3은 본 발명에 따른 공기조화기의 회로구성도이다.3 is a circuit diagram of an air conditioner according to the present invention.
도 4는 본 발명에 따른 공기조화기의 실외기마이콤의 제어동작을 설명하기 위한 흐름도이다.4 is a flowchart illustrating a control operation of an outdoor unit microcomputer of the air conditioner according to the present invention.
*도면의 주요부분에 대한 부호 설명** Description of symbols on the main parts of the drawings *
9 : 전기히터 10 : 외부전원9: electric heater 10: external power
11 : 파워릴레이 12 : 저압스위치11: power relay 12: low pressure switch
20 : 외기온도감지부 21 : 실외기마이콤20: outside temperature sensing unit 21: outdoor unit microcomputer
22 : 릴레이구동부 23 : 릴레이22: relay driving unit 23: relay
상기와 같은 본 발명의 목적은 압축기의 흡입측 냉매 압력이 저하되는 경우실외기에서 실내기로 공급되는 전원을 차단하기 위한 저압스위치를 구비한 공기조화기에 있어서, 상기 저압스위치가 오프되더라도 실내기에 설치된 전기히터를 이용하여 난방운전을 수행하도록 상기 실내기로 전원을 공급하기 위한 전원공급수단에 의하여 달성된다.An object of the present invention as described above in the air conditioner having a low pressure switch for shutting off the power supplied to the indoor unit from the outdoor unit when the refrigerant pressure on the suction side of the compressor is lowered, the electric heater installed in the indoor unit even if the low pressure switch is off It is achieved by the power supply means for supplying power to the indoor unit to perform the heating operation using.
상기 전원공급수단은 외기온도가 미리 설정된 기준온도 이하이면 상기 실내기로 전원을 공급하는 것을 특징으로 한다.The power supply means is characterized in that for supplying power to the indoor unit if the outside temperature is less than the predetermined reference temperature.
상기 전원공급수단은 상기 저압스위치와 병렬 연결된 릴레이; 외기온도를 감지하기 위한 외기온도감지부; 감지된 외기온도가 미리 설정된 기준온도 이하이면 상기 릴레이를 온시키기 위한 릴레이 구동신호를 출력하는 제어부; 및 상기 제어부의 릴레이구동신호에 따라 상기 릴레이를 온시키는 릴레이구동부를 포함한다.The power supply means includes a relay connected in parallel with the low voltage switch; An outside air temperature sensing unit for sensing an outside air temperature; A controller for outputting a relay driving signal for turning on the relay when the detected outside temperature is less than or equal to a preset reference temperature; And a relay driver for turning on the relay according to the relay driver signal of the controller.
상기와 같은 본 발명의 목적은 압축기의 흡입측 냉매 압력이 저하되는 경우 실외기에 마련된 저압스위치가 오프되어 실내기로 공급되는 전원을 차단하는 공기조화기의 제어방법에 있어서, 난방운전 모드인가를 판단하는 단계; 난방운전 모드에서 상기 저압스위치가 오프되더라도 상기 실내기로 전원을 공급하는 단계; 및 상기 실내기에 설치된 전원히터를 구동하여 난방운전을 수행하는 단계에 의하여 달성된다.The purpose of the present invention as described above is to determine whether the heating operation mode in the control method of the air conditioner to cut off the power supplied to the indoor unit when the low pressure switch provided to the outdoor unit is turned off when the refrigerant pressure on the suction side of the compressor is lowered step; Supplying power to the indoor unit even when the low pressure switch is turned off in a heating operation mode; And driving the power heater installed in the indoor unit to perform a heating operation.
상기 전원 공급단계는 난방운전 모드에서 외기온도를 감지하는 단계; 감지된 외기온도가 기준온도 이하인지를 판단하는 단계; 및 감지된 외기온도가 기준온도 이하이면 상기 저압스위치에 병렬연결된 릴레이를 구동하여 상기 실내기로 전원을 공급하는 단계로 이루어진다.The power supply step may include detecting the outside temperature in the heating operation mode; Determining whether the sensed outside temperature is below a reference temperature; And if the sensed outside temperature is less than the reference temperature, driving the relay connected in parallel to the low pressure switch to supply power to the indoor unit.
이하에서 본 발명에 따른 바람직한 일실시예를 첨부도면에 따라 상세히 설명하기로 한다.Hereinafter, a preferred embodiment according to the present invention will be described in detail according to the accompanying drawings.
도 3은 본 발명에 따른 공기조화기의 회로구성도로서, 종래와 동일 기능의 동일 구성요소에 대해서는 동일 부호를 인용한다.3 is a circuit configuration diagram of an air conditioner according to the present invention, and the same reference numerals are used for the same components having the same functions as in the prior art.
도시한 바와 같이, 본 발명은 외부 전원(10)과 실내기를 연결하는 전원선에 연결된 파워릴레이(11)와, 상기 파워릴레이(11)의 코일에 직렬 연결된 저압스위치(12)와, 실내기에 설치되어 전기히터(9)의 작동을 제어하는 실내기마이콤(13)과 상기 실내기마이콤(13)의 제어에 따라 전기히터(9)를 구동하기 위한 전기히터구동부(14)를 구비한다.As shown, the present invention is installed in the power relay 11, the low voltage switch 12 connected in series to the coil of the power relay 11, connected to the power line connecting the external power source 10 and the indoor unit, And an indoor heater micom 13 for controlling the operation of the electric heater 9 and an electric heater driver 14 for driving the electric heater 9 according to the control of the indoor machine microcom 13.
또한 본 발명은 저압스위치(12)에 병렬 연결된 릴레이(23)와, 상기 릴레이(23)를 구동하기 위한 릴레이구동부(22)와, 외기온도를 감지하기 위한 외기온도감지부(20)와, 상기 외기온도감지부(20)에 의하여 감지된 외기온도에 따라 상기 릴레이(23)를 구동하기 위한 릴레이구동신호를 상기 릴레이구동부(22)로 출력하는 실외기마이콤(21)을 포함한다.In addition, the present invention is a relay 23 connected in parallel to the low pressure switch 12, the relay driver 22 for driving the relay 23, the outside air temperature sensing unit 20 for sensing the outside temperature, the outside air temperature The outdoor unit microcom 21 outputs a relay driving signal for driving the relay 23 to the relay driving unit 22 according to the ambient air temperature sensed by the sensor 20.
상기 실외기마이콤(21)은 상기 외기온도감지부(20)를 통하여 감지된 외기온도와 미리 설정된 기준온도를 비교하여 상기 릴레이(23)를 구동여부를 결정한다. 즉, 상기 실외기마이콤(21)은 겨울철과 같이 외기온도가 떨어져 상기 저압스위치(12)가 오프될 우려가 있을 때 실내기로 공급되는 외부 전원(10)이 차단될 수 있으므로 이를 방지하기 위해 상기 릴레이(23)를 온시키는 것이다. 여기서, 상기 기준온도는 외기온도가 낮은 관계로 냉매 압력이 저하되어 압축기 흡입측에설치된 상기 저압스위치(10)가 오프되는 온도를 말하며, 바람직하게는 약 -10℃로 설정한다.The outdoor unit microcomputer 21 determines whether to drive the relay 23 by comparing the outside temperature detected by the outside temperature sensing unit 20 with a preset reference temperature. That is, the outdoor unit microcom 21 may be cut off the external power supply 10 to the indoor unit when there is a fear that the low-pressure switch 12 is turned off, such as in winter when the external air temperature is lowered to prevent the relay ( 23) to warm up. Here, the reference temperature refers to a temperature at which the low pressure switch 10 installed on the compressor suction side is turned off because the refrigerant pressure is lowered due to a low outside temperature, and is preferably set to about -10 ° C.
상기 실외기마이콤(21)은 상기 실내기마이콤(13과 통신선(미도시)를 통하여 공기조화기의 운전모드가 난방운전 모드인지를 판단하고, 난방운전 모드에서 감지된 외기온도에 따라 릴레이(23)의 구동을 제어한다.The outdoor unit microcomputer 21 determines whether the operation mode of the air conditioner is a heating operation mode through the indoor unit microcom 13 and a communication line (not shown), and according to the ambient air temperature detected in the heating operation mode of the relay 23. Control the drive.
상기 외기온도감지부(20)는 써미스터(TH)와 저항(R1)(R2)으로 이루어지고, 외기온도에 상응하는 감지신호를 실내기마이콤(21)으로 출력하는데, 이는 상기 써미스터(TH)의 저항값이 외기온도에 따라 변하기 때문이다.The outside temperature sensing unit 20 includes a thermistor TH and a resistor R1 and R2, and outputs a detection signal corresponding to the outside temperature to the indoor microcomputer 21, which is a resistance value of the thermistor TH. This is because it changes according to the outside temperature.
상기 릴레이구동부(22)는 저항(R3)과 트랜지스터(TR)로 이루어지고, 상기 트랜지스터(TR)는 상기 실외기마이콤(21)으로부터 출력되는 릴레이구동신호에 따라 온 또는 오프된다, 즉, 상기 실외기마이콤(21)이 감지된 외기온도가 기준온도 보다 낮으면 상기 릴레이(23)를 온시키기 위한 릴레이구동신호를 상기 릴레이구동부(22)로 출력하고 이에 따라 상기 트랜지스터(TR)가 온됨에 따라 구동전원(+12V)이 릴레이(23)의 코일에 공급되어 릴레이(23)의 접점이 온된다. 또 상기 실외기마이콤(21)이 상기 릴레이(23)를 오프시키기 위한 릴레이구동신호를 출력하는 경우 상기 트랜지스터(TR)가 오프됨에 따라 구동전원(+12V)이 릴레이(23)의 코일에 공급되지 않아 릴레이(23)의 접점이 오프된다.The relay driver 22 includes a resistor R3 and a transistor TR, and the transistor TR is turned on or off in response to a relay drive signal output from the outdoor device microcomb 21, that is, the outdoor device microcomb. If the detected outdoor temperature is lower than the reference temperature, the relay driving signal for turning on the relay 23 is output to the relay driver 22, and thus the transistor TR is turned on. + 12V) is supplied to the coil of the relay 23 so that the contact of the relay 23 is turned on. In addition, when the outdoor device microcomputer 21 outputs a relay driving signal for turning off the relay 23, the driving power (+ 12V) is not supplied to the coil of the relay 23 as the transistor TR is turned off. The contact of the relay 23 is turned off.
상기 저압스위치(12)는 압축기 흡입측에 설치되어 냉매 압력이 기준 압력 이하로 저하되면 오프된다. 이때, 상기 실외기마이콤(21)이 릴레이(23)를 온시키기 때문에 외부 전원(10)이 차단되지 않고 실내기로 공급된다. 따라서,실내기마이콤(13)은 사용자에 의해 설정된 난방운전을 수행하기 위한 히터구동신호를 전기히터구동부(14)로 출력하여 전기히터(9)를 구동시킬 수 있다.The low pressure switch 12 is installed on the compressor suction side and is turned off when the refrigerant pressure drops below the reference pressure. At this time, since the outdoor unit microcomputer 21 turns on the relay 23, the external power source 10 is supplied to the indoor unit without being cut off. Therefore, the indoor microcomputer 13 may drive the electric heater 9 by outputting a heater driving signal for performing the heating operation set by the user to the electric heater driving unit 14.
즉, 상기 저압스위치(12)가 오프되더라도 상기 릴레이(23)가 온되면 구동전원(+12V)이 파워릴레이(11)의 코일에 공급되어 전류가 흐르므로 파워릴레이(11)의 접점이 온되어 외부 전원(10)을 실내기로 공급할 수 있다.That is, even when the low voltage switch 12 is turned off, when the relay 23 is turned on, a driving power supply (+ 12V) is supplied to the coil of the power relay 11 so that a current flows, so that the contact of the power relay 11 is turned on. The external power source 10 may be supplied to the indoor unit.
상기와 같이 구성된 본 발명에 따른 공기조화기의 실외기마이콤의 제어동작을 도 4에 따라 설명한다.The control operation of the outdoor unit microcomputer of the air conditioner according to the present invention configured as described above will be described with reference to FIG.
상기 실외기마이콤(21)은 상기 실내기 마이콤(13)과 통신선을 통하여 상호 통신하여 현재의 공기조화기의 운전모드가 난방운전 모드인가를 판단한다(S10). 그 판단결과 난방운전 모드가 아니면 해당 운전모드에 따라 공기조화기를 운전하기 위하여 리턴하고, 난방운전 모드인 경우 외기온도감지부(20)를 통해 입력되는 감지신호에 따라 외기온도를 감지한다(S20).The outdoor unit microcomputer 21 communicates with the indoor unit microcomputer 13 through a communication line to determine whether the current operation mode of the air conditioner is the heating operation mode (S10). If it is determined that the heating operation mode is not the return to operate the air conditioner according to the operation mode, and in the heating operation mode to detect the outside air temperature in accordance with the detection signal input through the outside temperature sensor 20 (S20).
이어 상기 실외기마이콤(21)은 감지된 외기온도가 미리 설정된 기준온도 이하인지를 판단한다(S30). 여기서, 기준온도는 혹한기와 같이 외기온도가 저하되는 관계로 냉매 압력이 저하되어 압축기 흡입측에 설치된 상기 저압스위치(10)가 오프되는 온도를 말한다.Subsequently, the outdoor unit microcomputer 21 determines whether the detected outdoor temperature is less than or equal to a preset reference temperature (S30). Here, the reference temperature refers to the temperature at which the low pressure switch 10 installed on the suction side of the compressor is turned off due to the decrease in the refrigerant pressure in relation to the decrease in the outside temperature, such as in a cold weather.
단계 S30의 판단결과 감지된 외기온도가 기준온도 이하이면 릴레이(23)를 온시키기 위한 릴레이구동신호를 상기 릴레이구동부(22)로 출력하고, 이에 따라 트랜지스터(TR)가 온됨에 따라 릴레이(23)의 접점이 온된다. 따라서, 상기 저압스위치(12)가 오프되더라도 파워릴레이(11)가 온되기 때문에 외부 전원(10)이실내기로 공급되고 이후 실내기마이콤(13)의 제어에 따라 전기히터(9)를 구동하여 난방운전을 수행할 수 있다.If the detected outside temperature is less than the reference temperature as a result of the determination in step S30, a relay driving signal for turning on the relay 23 is output to the relay driver 22, and as a result, the transistor 23 is turned on, thereby relay 23. Contact is turned on. Therefore, since the power relay 11 is turned on even when the low pressure switch 12 is turned off, the external power supply 10 is supplied to the room, and then the electric heater 9 is driven by heating the electric heater 9 under the control of the indoor microcomputer 13. Can be performed.
단계 S30의 판단결과 감지된 외기온도가 기준온도 이하가 아니면 릴레이(23)를 오프시키기 위한 릴레이구동신호를 상기 릴레이구동부(22)로 출력하고, 이에 따라 트랜지스터(TR)가 오프됨에 따라 릴레이(23)의 접점이 오프된다.If the detected outside temperature is not equal to or less than the reference temperature as a result of the determination in step S30, a relay driving signal for turning off the relay 23 is output to the relay driver 22, and as a result, the transistor TR is turned off, thereby relay 23. ) Is turned off.
이상에서 설명한 바와 같이 본 발명은 겨울철과 같이 외기온도가 낮은 경우 냉매 압력이 저하되는 관계로 저압스위치가 오프되더라도 그 저압스위치에 병렬 연결된 릴레이를 통하여 파워릴레이를 구동할 수 있어서 외부 전원을 실내기로 공급하여 전기히터를 이용한 난방운전을 정상적으로 수행할 수 있다.As described above, the present invention can drive a power relay through a relay connected in parallel to the low pressure switch even when the low pressure switch is turned off because the refrigerant pressure is lowered when the outside temperature is low, such as winter, so that the external power is supplied to the indoor unit. The heating operation using the electric heater can be performed normally.
Claims (5)
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KR10-2001-0075153A KR100423972B1 (en) | 2001-11-30 | 2001-11-30 | Air conditioner and therof control method |
US10/164,386 US20030102121A1 (en) | 2001-11-30 | 2002-06-10 | Air conditioner and method of controlling the same |
CNB021403325A CN1196899C (en) | 2001-11-30 | 2002-07-01 | Air conditioner and its controlling method |
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DE10361392B4 (en) * | 2003-12-29 | 2009-07-30 | Airbus Deutschland Gmbh | Air distribution system |
US9261282B2 (en) * | 2009-09-10 | 2016-02-16 | Lennox Industries Inc. | Heating system controller, a heating system and a method of operating a heating system |
JP6120786B2 (en) * | 2014-02-13 | 2017-04-26 | 三菱電機株式会社 | Air conditioner and control program |
US11209177B2 (en) * | 2014-11-21 | 2021-12-28 | Mitsubishi Electric Corporation | System and method for controlling the operation of an outdoor air conditioner |
US10605481B2 (en) * | 2016-03-24 | 2020-03-31 | Gregory Mark Huseman | Systems and methods for replaceable multiple filter units |
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US3171264A (en) * | 1961-01-23 | 1965-03-02 | Gerald R Griffin | Low-pressure and safety cut-in switch |
US3252295A (en) * | 1963-09-27 | 1966-05-24 | American Air Filter Co | Refrigeration control system |
US4384608A (en) * | 1980-08-11 | 1983-05-24 | Ford Motor Company | Reverse cycle air conditioner system |
US4718246A (en) * | 1986-09-02 | 1988-01-12 | Mitchell Charles F | Pressure control override |
JPH0689976B2 (en) * | 1987-03-13 | 1994-11-14 | 株式会社東芝 | Refrigerator temperature control circuit |
JP2597394B2 (en) * | 1988-09-09 | 1997-04-02 | 株式会社ゼクセル | Vehicle air conditioner |
US5520327A (en) * | 1994-09-23 | 1996-05-28 | Carrier Corporation | Electronic thermostat having safety feature |
KR19980072366A (en) * | 1997-03-04 | 1998-11-05 | 구자홍 | Operation method in case of power failure of air conditioner |
KR20000019502A (en) * | 1998-09-11 | 2000-04-15 | 구자홍 | Operation mode selector of air conditioner and selection method thereof |
KR100315485B1 (en) * | 1999-11-19 | 2001-11-30 | 윤종용 | compressor starting apparatus of air conditioner |
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2001
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2002
- 2002-06-10 US US10/164,386 patent/US20030102121A1/en not_active Abandoned
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US20030102121A1 (en) | 2003-06-05 |
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