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WO2019163451A1 - Low-capacity indoor unit - Google Patents

Low-capacity indoor unit Download PDF

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Publication number
WO2019163451A1
WO2019163451A1 PCT/JP2019/003197 JP2019003197W WO2019163451A1 WO 2019163451 A1 WO2019163451 A1 WO 2019163451A1 JP 2019003197 W JP2019003197 W JP 2019003197W WO 2019163451 A1 WO2019163451 A1 WO 2019163451A1
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WO
WIPO (PCT)
Prior art keywords
unit
indoor
low
capacity
indoor unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2019/003197
Other languages
French (fr)
Japanese (ja)
Inventor
裕記 藤岡
智彦 堤
勝則 村田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Priority to CN201980010681.0A priority Critical patent/CN111656102A/en
Priority to EP19756797.7A priority patent/EP3757471A4/en
Publication of WO2019163451A1 publication Critical patent/WO2019163451A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
    • 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/52—Indication arrangements, e.g. displays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/50—Air quality properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/031—Sensor arrangements
    • F25B2313/0314—Temperature sensors near the indoor heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/031—Sensor arrangements
    • F25B2313/0315—Temperature sensors near the outdoor heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/23—High amount of refrigerant in the system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2104—Temperatures of an indoor room or compartment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2106—Temperatures of fresh outdoor air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • This disclosure relates to a low-capacity indoor unit.
  • the rated cooling capacity is generally 2.2 kW or more, and a low-capacity indoor unit with a rated cooling capacity of less than 2.2 kW is installed in a space with a small floor area such as a washroom.
  • a flammable refrigerant including a slightly flammable refrigerant such as R32 refrigerant
  • the risk of ignition and the like increases when the gas concentration increases to some extent.
  • This disclosure proposes a low-capacity indoor unit that reduces the risk of refrigerant leakage.
  • the low-capacity indoor unit of the present disclosure is The rated cooling capacity is less than 2.2 kW, An informing unit for informing an abnormality when connected to an outdoor unit other than the exclusive outdoor unit for which the combination is permitted is provided.
  • the notification unit when the rated cooling capacity is less than 2.2 kW and connected to an outdoor unit other than the dedicated outdoor unit that is permitted to be combined, the notification unit notifies the abnormality, so that the refrigerant other than the dedicated outdoor unit Other outdoor units with a large filling amount are not connected and operated, and the risk of refrigerant leakage can be reduced.
  • the rated cooling capacity is 1.6 kW or less.
  • the rated cooling capacity is 1.6 kW or less, it is suitable for air conditioning in a narrow space such as a washroom or a kitchen, and the safety at the time of refrigerant leakage in the narrow space is high.
  • the dedicated outdoor unit supports multi-type air conditioners that can connect multiple indoor units.
  • the low-capacity indoor unit can operate as an indoor unit of the multi-type air conditioner and is at least one of the plurality of indoor units.
  • a multi-type air conditioner in which a plurality of indoor units including at least one low-capacity indoor unit are connected to a dedicated outdoor unit.
  • the notification unit When the allowable refrigerant charging amount of the outdoor unit notified from the connected outdoor unit is larger than the allowable refrigerant charging amount calculated in advance from the rated cooling capacity, an abnormality is notified.
  • the notifying unit can determine whether the combination is permitted or not based on the allowable refrigerant filling amount of the outdoor unit notified from the connected outdoor unit.
  • FIG. 1 is a configuration diagram of a multi-type air conditioner including the low-capacity indoor unit 20C according to the first embodiment of the present disclosure.
  • the multi-type air conditioner of the first embodiment includes an indoor unit 20A having an indoor heat exchanger 4A and an indoor fan 5A, and an indoor unit 20B having an indoor heat exchanger 4B and an indoor fan 5B. And a low-capacity indoor unit 20C having an indoor heat exchanger 4C and an indoor fan 5C, and a dedicated outdoor unit 10 connected to the indoor units 20A and 20B and the low-capacity indoor unit 20C via a refrigerant pipe.
  • the dedicated outdoor unit 10 corresponds to a multi-type air conditioner to which a plurality of indoor units can be connected, and the low-capacity indoor unit 20C can operate as an indoor unit of the multi-type air conditioner.
  • 1 is a compressor
  • 2 is a four-way switching valve with one end connected to the discharge side of the compressor
  • 3 is an outdoor heat exchanger with one end connected to the other end of the four-way switching valve
  • EVA , EVB, EVC are electric expansion valves having one end connected to the other end of the outdoor heat exchanger 3, respectively.
  • An exchanger 6 is an accumulator in which one end is connected to the other end of the indoor heat exchangers 4A, 4B, and 4C via the four-way switching valve 2 and the other end is connected to the suction side of the compressor 1.
  • Indoor fans 5A, 5B, 5C are arranged in the vicinity of the indoor heat exchangers 4A, 4B, 4C, respectively.
  • a plurality of refrigerant pipe connection portions 7A, 7B, 7C are connected to the other ends of the electric expansion valves EVA, EVB, EVC, and the plurality of refrigerant pipe connection portions 7A, 7B, 7C are connected to the other refrigerant piping connection ports (refrigerant pipes).
  • One end of each of the indoor heat exchangers 4A, 4B, 4C is connected.
  • a plurality of refrigerant pipe connection portions 8A, 8B, and 8C are connected to the other ends of the indoor heat exchangers 4A, 4B, and 4C through connection pipes (refrigerant pipes).
  • the compressor 1, the four-way switching valve 2, the outdoor heat exchanger 3, the electric expansion valves EVA, EVB, EVC, the indoor heat exchangers 4A, 4B, 4C, and the accumulator 6 constitute a refrigerant circuit.
  • This refrigerant circuit is filled with a slightly flammable R32 refrigerant.
  • a discharge pipe temperature sensor 11 is provided on the discharge side of the compressor 1.
  • the outdoor heat exchanger 3 is provided with an outdoor heat exchanger temperature sensor 12 for detecting the outdoor heat exchanger temperature, and an outdoor temperature sensor 13 for detecting the outdoor temperature is provided in the vicinity of the outdoor heat exchanger 3.
  • the indoor heat exchanger 4A is provided with an indoor heat exchanger temperature sensor 15A that detects the temperature of the indoor heat exchanger, and an indoor temperature sensor 16A that detects the indoor temperature is provided near the indoor heat exchanger 4A.
  • the indoor heat exchanger 4B is provided with an indoor heat exchanger temperature sensor 15B that detects the temperature of the indoor heat exchanger, and an indoor temperature sensor 16B that detects the indoor temperature is provided near the indoor heat exchanger 4B.
  • the indoor heat exchanger 4C is provided with an indoor heat exchanger temperature sensor 15C that detects the temperature of the indoor heat exchanger, and an indoor temperature sensor 16C that detects the indoor temperature is provided near the indoor heat exchanger 4C.
  • the dedicated outdoor unit 10 includes an outdoor control device 18 including a microcomputer and an input / output circuit.
  • the outdoor control device 18 includes an operation control unit 18a that controls the compressor 1, the electric expansion valves EVA, EVB, EVC, and the like, and a communication unit 18b.
  • Each of the indoor units 20A and 20B includes an indoor control device (not shown), and the low-capacity indoor unit 20C includes the indoor control device 100 illustrated in FIG.
  • the indoor control devices of the indoor units 20A and 20B and the indoor control device 100 of the low-capacity indoor unit 20C communicate with each other via the communication line (not shown) with the outdoor control device 18 of the dedicated outdoor unit 10,
  • the outdoor control device 18 and the indoor control devices of the indoor units 20A and 20B and the indoor control device 100 of the low-capacity indoor unit 20C operate in cooperation, thereby operating as a multi-type air conditioner.
  • the four-way switching valve 2 is switched to the dotted line position and the operation of the compressor 1 is started. Then, the electric expansion valves EVA, EVB, EVC are each opened to a predetermined opening degree.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is condensed by a heat exchange with the outdoor air by operating an outdoor fan (not shown) in the outdoor heat exchanger 3 to become a liquid refrigerant.
  • the liquid refrigerant from the indoor heat exchangers 4A, 4B, 4C is decompressed by the electric expansion valves EVA, EVB, EVC, and then the indoor fans 5A, 5B, 5C are operated to operate the indoor heat exchanger 4A, At 4B and 4C, it evaporates by heat exchange with room air to become a gas refrigerant, and returns to the suction side of the compressor 1.
  • the rated cooling capacity of the indoor units 20A and 20B is 2.2 kW
  • the rated cooling capacity of the low capacity indoor unit 20C is 0.8 kW. That is, the low-capacity indoor unit 20C has a lower capacity than the indoor units 20A and 20B.
  • the four-way switching valve 2 is switched to the position of the solid line, and the operation of the compressor 1 is started. Then, the electric expansion valves EVA, EVB, EVC are each opened to a predetermined opening degree.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is condensed by heat exchange with indoor air in the indoor heat exchangers 4A, 4B, and 4C by operating the indoor fans 5A, 5B, and 5C. Become.
  • the liquid refrigerant from the indoor heat exchangers 4A, 4B, 4C is decompressed by the electric expansion valves EVA, EVB, EVC, and then an outdoor fan (not shown) is operated by the outdoor heat exchanger 3. It evaporates by heat exchange with the outdoor air to become a gas refrigerant and returns to the suction side of the compressor 1.
  • FIG. 2 is an external view of the low-capacity indoor unit 20C viewed obliquely from below.
  • This indoor unit is a ceiling-embedded indoor unit.
  • the low-capacity indoor unit 20C includes a casing main body 101, a rectangular panel 102 attached to the lower side of the casing main body 101, and a grill 103 detachably attached to the panel 102. I have.
  • the blower outlet 110 is provided along the short side of the panel 102 on one side in the longitudinal direction of the panel 102.
  • a flap 120 is rotatably attached to the panel 102.
  • FIG. 2 shows a state in which the air outlet 110 is closed by the flap 120.
  • a drain socket 107 is provided so as to protrude from the side wall of the casing body 101.
  • a drain hose (not shown) is connected to the drain socket 107 from the outside.
  • the pipe connecting portions 105 and 106 are provided so as to protrude from the side wall of the casing main body 101.
  • a refrigerant pipe (not shown) is connected to the pipe connecting portions 105 and 106 from the outside.
  • reference numeral 108 denotes an electrical component part
  • reference numerals 111 to 113 denote suspension fittings provided so as to protrude laterally from the casing main body 101, respectively.
  • FIG. 3 is a block diagram of the indoor control device 100 of the low-capacity indoor unit 20C.
  • the low-capacity indoor unit 20C includes an indoor control device 100 including a microcomputer and an input / output circuit as shown in FIG.
  • the indoor control device 100 includes an operation control unit 100a, a communication unit 100b, a model determination unit 100c, and a notification unit 100d.
  • the operation control unit 100a controls the fan motor 21 and the flap driving unit 22 based on detection signals from the indoor temperature sensor 16C and the indoor heat exchanger temperature sensor 15C.
  • the communication unit 100b performs communication with the outdoor control device 18 (shown in FIG. 1) of the dedicated outdoor unit 10 connected to the low-capacity indoor unit 20C via the communication unit 18b.
  • the model determination unit 100c determines whether the connected outdoor unit is a dedicated outdoor unit permitted to be combined with the low-capacity indoor unit 20C based on the model ID of the outdoor unit received by the communication unit 100b. .
  • the notification unit 100d blinks the power lamp of the display unit 23 to notify the abnormality.
  • a buzzer sound may be emitted simultaneously with blinking of the power lamp.
  • the means for notifying the abnormality is not limited to the power lamp or the buzzer sound, and the abnormality may be notified by a display unit, audio output, or the like.
  • FIG. 4 is a flowchart for explaining the operation of the indoor control device 100.
  • step S1 shown in FIG. 4 it is determined whether or not the outdoor unit is connected to the low-capacity indoor unit 20C. If it is determined that the outdoor unit is connected to the low-capacity indoor unit 20C, the process proceeds to step S2. On the other hand, when the outdoor unit is not connected to the low-capacity indoor unit 20C, step S1 is repeated.
  • step S2 the model ID is acquired from the outdoor unit by the communication unit 100b.
  • step S3 the process proceeds to step S3, and based on the model ID acquired from the outdoor unit, the model determination unit 100c determines whether the connected outdoor unit is a dedicated outdoor unit permitted to be combined.
  • step S3 If it is determined in step S3 that the unit is a dedicated outdoor unit, the process proceeds to step S4. On the other hand, if it is determined that the unit is not a dedicated outdoor unit, the process proceeds to step S5.
  • step S4 normal operation, that is, cooling operation or heating operation is performed according to a command from a remote controller or the like.
  • the notification unit 100d notifies the abnormality. . Therefore, other outdoor units with a large amount of refrigerant other than the dedicated outdoor unit 10 are not connected and operated, and the risk of refrigerant leakage can be reduced.
  • the allowable refrigerant filling amount of the dedicated outdoor unit 10 is such that each indoor unit is a multi-type air conditioner configured of the dedicated outdoor unit 10 and the maximum number of indoor units connected to the dedicated outdoor unit 10. This is the refrigerant filling amount that fills the refrigerant circuit when connected with the maximum pipe length.
  • the allowable refrigerant filling amount of the dedicated outdoor unit 10 is 1.8 kg.
  • the maximum concentration at the time of refrigerant leakage is 0.227 kg / m 3 ( ⁇ 1.8 kg ( 3.3 m 2 ⁇ 2.4 m)) or less.
  • the allowable refrigerant charging amount is 4.0 kg.
  • the maximum concentration at the time of refrigerant leakage is 0.238 kg / m 3 ( ⁇ 4.0 kg (7 m 2 x 2.4 m)) or less.
  • the maximum concentration is small and safer against refrigerant leakage.
  • the rated cooling capacity of the low-capacity indoor unit 20C is 1.6 kW or less (0.8 kW in this embodiment), it is suitable for air conditioning in a narrow space such as a washroom, and at the time of refrigerant leakage in the narrow space. High safety.
  • a multi-type air conditioner in which a plurality of indoor units including at least one low-capacity indoor unit 20C is connected to the dedicated outdoor unit 10 can be provided.
  • model determination unit 100c and the notification unit 100d are provided on the low-capacity indoor unit 20C side.
  • the model determination unit and the notification unit may be provided on the dedicated outdoor unit 10 side.
  • FIG. 5 is a block diagram of the indoor control device 200 of the low-capacity indoor unit 20C according to the second embodiment of the present disclosure.
  • the low-capacity indoor unit 20C of the second embodiment has the same configuration as the low-capacity indoor unit 20C of the first embodiment except for the indoor control device 200.
  • the low-capacity indoor unit 20C includes an indoor control device 200 including a microcomputer and an input / output circuit.
  • the indoor control device 200 includes an operation control unit 200a, a communication unit 200b, an allowable refrigerant filling amount determination unit 200c, and a notification unit 200d.
  • the operation control unit 200a controls the fan motor 21 and the flap drive unit 22 based on detection signals from the indoor temperature sensor 16C and the indoor heat exchanger temperature sensor 15C.
  • the communication unit 200b performs communication with the outdoor control device 18 (shown in FIG. 1) of the dedicated outdoor unit 10 connected to the low-capacity indoor unit 20C via the communication unit 18b.
  • the allowable refrigerant charge amount determination unit 200c uses an allowable refrigerant charge amount A calculated in advance from the rated cooling capacity 0.8 kW of the low-capacity indoor unit 20C so that the allowable refrigerant charge amount X received from the outdoor unit is received by the communication unit 200b. It is determined whether there are too many.
  • the volume is obtained from the floor area (3.3 m 2 ) and the ceiling height (2.4 m) of the room to be applied, and the refrigerant is placed in the room of that volume.
  • an allowable refrigerant charging amount A is calculated so that the maximum concentration at the time of refrigerant leakage is 0.227 kg / m 3 ( ⁇ 1.8 kg (3.3 m 2 ⁇ 2.4 m)) or less.
  • the notification unit 200d determines that the allowable refrigerant charging amount determination unit 200c If determined, the power lamp of the display unit 23 blinks to notify the abnormality.
  • a buzzer sound may be emitted simultaneously with blinking of the power lamp.
  • the means for notifying the abnormality is not limited to the power lamp or the buzzer sound, and the abnormality may be notified by a display unit, audio output, or the like.
  • FIG. 6 is a flowchart for explaining the operation of the indoor control device 200.
  • step S11 shown in FIG. 6 it is determined whether or not the outdoor unit is connected to the low-capacity indoor unit 20C. If it is determined that the outdoor unit is connected to the low-capacity indoor unit 20C, the process proceeds to step S12. On the other hand, when the outdoor unit is not connected to the low-capacity indoor unit 20C, step S11 is repeated.
  • step S12 the allowable refrigerant charge amount X is acquired from the outdoor unit by the communication unit 200b.
  • an allowable refrigerant charge amount determination unit determines whether or not the allowable refrigerant charge amount X of the outdoor unit is larger than the allowable refrigerant charge amount A calculated in advance from the rated cooling capacity of the low-capacity indoor unit 20C. Determined by 200c.
  • step S13 If it is determined in step S13 that the allowable refrigerant charge amount X is larger than the allowable refrigerant charge amount A, the process proceeds to step S15, the abnormality is notified by the notification unit 100d, and the process is terminated. On the other hand, if it is determined in step S13 that the allowable refrigerant charging amount X is equal to or smaller than the allowable refrigerant charging amount A, the process proceeds to step S14.
  • step S14 normal operation, that is, cooling operation or heating operation is performed according to a command from a remote controller or the like.
  • the allowable refrigerant charge amount X of the dedicated outdoor unit 10 is set smaller than the allowable refrigerant charge amount A calculated in advance from the rated cooling capacity of the low-capacity indoor unit 20C.
  • the notification unit 200d does not notify the abnormality.
  • the allowable refrigerant charge amount X of the outdoor unit notified is larger than the allowable refrigerant charge amount A calculated in advance from the rated cooling capacity. Therefore, the notification unit 200d notifies the abnormality.
  • the allowable refrigerant filling amount determination unit 200c is provided on the low-capacity indoor unit 20C side, but an allowable refrigerant filling amount determination unit may be provided on the dedicated outdoor unit 10 side.
  • the connected outdoor unit is the dedicated outdoor unit 10 or the allowable refrigerant charge amount X from the outdoor unit is It is determined whether or not the allowable refrigerant charging amount A calculated in advance from the rated cooling capacity of the low-capacity indoor unit 20C is larger than the allowable refrigerant charging amount A, but the connected outdoor unit is a dedicated outdoor unit that is permitted to be combined.
  • the means for determining is not limited to these.
  • the multi-type air conditioner includes the dedicated outdoor unit 10 and a plurality of indoor units (including the low-capacity indoor unit 20C) connected to the dedicated outdoor unit 10.
  • a dedicated outdoor unit and a low-capacity indoor unit are connected one-to-one may be used.
  • Indoor unit 20C Low-capacity indoor unit 100 ... Indoor control device 100a ... Operation control unit 100b ... Communication unit 100c ... Model determination unit 100d ... Notification 200: Indoor control device 200a: Operation control unit 200b ... Communication unit 200c ... Allowable refrigerant filling amount determination unit 200d ... Notification unit EVA, EVB, EVC ... Electric expansion Valve

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Abstract

Provided is a low-capacity indoor unit (20C) having a rated cooling capacity of less than 2.2 kW and provided with a notification unit (100d) that notifies an abnormality when the indoor unit is connected to an outdoor unit other than a dedicated outdoor unit (10) with which the indoor unit is permitted to be combined.

Description

低能力室内機Low capacity indoor unit

　本開示は、低能力室内機に関する。 This disclosure relates to a low-capacity indoor unit.

　従来、室内の天井に埋め込まれた天吊り型の室内機と、その室内機に接続された室外機とを備えた空気調和機がある(例えば、特開２０１６－１４８５１０号公報(特許文献１)参照)。 Conventionally, there is an air conditioner including a ceiling-suspended indoor unit embedded in an indoor ceiling and an outdoor unit connected to the indoor unit (for example, JP-A-2016-148510 (Patent Document 1)). reference).

　上記空気調和機において可燃性冷媒を用いている場合、室内機を規定通りの据付高さに据え付けることで国際規格に規定された「冷媒充填量に基づく、適用できる床面積」を満たすようにしている。これによって、万一、室内機から冷媒が漏れても、室内の冷媒濃度が一定以上にならない。 When flammable refrigerant is used in the above air conditioner, install the indoor unit at the specified installation height so as to satisfy the applicable floor area based on the refrigerant charge amount specified in the international standard. Yes. As a result, even if the refrigerant leaks from the indoor unit, the indoor refrigerant concentration does not exceed a certain level.

特開２０１６－１４８５１０号公報JP 2016-148510 A

　上記従来の空気調和機では、定格冷房能力が２.２ｋＷ以上であるのが一般的であり、定格冷房能力が２.２ｋＷ未満の低能力室内機を洗面所などの床面積が狭い空間に設置する場合は、その低能力室内機から冷媒が漏れて狭い空間に充満すると、冷媒充填量によっては冷媒漏洩時のリスクが高くなるという問題がある。特に、可燃性冷媒(Ｒ３２冷媒などの微燃性冷媒を含む)を用いる場合は、ガス濃度がある程度高くなると、発火などのリスクが高まる。 In the above conventional air conditioner, the rated cooling capacity is generally 2.2 kW or more, and a low-capacity indoor unit with a rated cooling capacity of less than 2.2 kW is installed in a space with a small floor area such as a washroom. In this case, if the refrigerant leaks from the low-capacity indoor unit and fills a narrow space, there is a problem that the risk at the time of refrigerant leakage increases depending on the refrigerant charging amount. In particular, when a flammable refrigerant (including a slightly flammable refrigerant such as R32 refrigerant) is used, the risk of ignition and the like increases when the gas concentration increases to some extent.

　本開示では、冷媒漏洩時のリスクを低減する低能力室内機を提案する。 This disclosure proposes a low-capacity indoor unit that reduces the risk of refrigerant leakage.

　本開示の低能力室内機は、
　定格冷房能力が２.２ｋＷ未満であって、
　組み合わせが許可された専用室外機以外の室外機に接続されたときに異常を報知する報知部を備えたことを特徴とする。 The low-capacity indoor unit of the present disclosure is
The rated cooling capacity is less than 2.2 kW,
An informing unit for informing an abnormality when connected to an outdoor unit other than the exclusive outdoor unit for which the combination is permitted is provided.

　本開示によれば、定格冷房能力が２.２ｋＷ未満であり、組み合わせが許可された専用室外機以外の室外機に接続されたときに報知部により異常を報知するので、専用室外機以外の冷媒充填量が多い他の室外機が接続されて運転されることがなくなり、冷媒漏洩時のリスクを低減できる。 According to the present disclosure, when the rated cooling capacity is less than 2.2 kW and connected to an outdoor unit other than the dedicated outdoor unit that is permitted to be combined, the notification unit notifies the abnormality, so that the refrigerant other than the dedicated outdoor unit Other outdoor units with a large filling amount are not connected and operated, and the risk of refrigerant leakage can be reduced.

　また、本開示の１つの態様に係る低能力室内機では、
　上記定格冷房能力が１.６ｋＷ以下である。 In the low-capacity indoor unit according to one aspect of the present disclosure,
The rated cooling capacity is 1.6 kW or less.

　上記実施形態によれば、定格冷房能力が１.６ｋＷ以下であるので、洗面所やキッチンなどの狭い空間の空気調和に適しており、狭い空間における冷媒漏洩時の安全性も高い。 According to the above embodiment, since the rated cooling capacity is 1.6 kW or less, it is suitable for air conditioning in a narrow space such as a washroom or a kitchen, and the safety at the time of refrigerant leakage in the narrow space is high.

　また、本開示の１つの態様に係る低能力室内機では、
　上記専用室外機は、複数の室内機が接続可能なマルチ型空気調和機に対応しており、
　上記低能力室内機は、上記マルチ型空気調和機の室内機として動作可能であって、上記複数の室内機のうちの少なくとも１つである。 In the low-capacity indoor unit according to one aspect of the present disclosure,
The dedicated outdoor unit supports multi-type air conditioners that can connect multiple indoor units.
The low-capacity indoor unit can operate as an indoor unit of the multi-type air conditioner and is at least one of the plurality of indoor units.

　本開示によれば、低能力室内機を少なくとも１つ含む複数の室内機が専用室外機に接続されたマルチ型空気調和機を提供できる。 According to the present disclosure, it is possible to provide a multi-type air conditioner in which a plurality of indoor units including at least one low-capacity indoor unit are connected to a dedicated outdoor unit.

　また、本開示の１つの態様に係る低能力室内機では、
　上記報知部は、
　接続された室外機から通知される該室外機の許容冷媒充填量が、上記定格冷房能力から予め算出された許容冷媒充填量よりも多いとき、異常を報知する。 In the low-capacity indoor unit according to one aspect of the present disclosure,
The notification unit
When the allowable refrigerant charging amount of the outdoor unit notified from the connected outdoor unit is larger than the allowable refrigerant charging amount calculated in advance from the rated cooling capacity, an abnormality is notified.

　本開示によれば、接続された室外機から通知される該室外機の許容冷媒充填量により、組み合わせが許可された専用室外機か否かを報知部により判断できる。 According to the present disclosure, the notifying unit can determine whether the combination is permitted or not based on the allowable refrigerant filling amount of the outdoor unit notified from the connected outdoor unit.

本開示の第１実施形態の低能力室内機を備えたマルチ型空気調和機の構成図である。It is a lineblock diagram of a multi type air harmony machine provided with the low capacity indoor unit of a 1st embodiment of this indication. 上記低能力室内機の斜め下方から見た外観図である。It is the external view seen from the diagonally lower side of the said low capacity indoor unit. 上記低能力室内機の室内制御装置のブロック図である。It is a block diagram of the indoor control apparatus of the said low capacity indoor unit. 上記室内制御装置の動作を説明するフローチャートである。It is a flowchart explaining operation | movement of the said indoor control apparatus. 本開示の第２実施形態の低能力室内機の室内制御装置のブロック図である。It is a block diagram of the indoor control apparatus of the low capacity indoor unit of a 2nd embodiment of this indication. 上記室内制御装置の動作を説明するフローチャートである。It is a flowchart explaining operation | movement of the said indoor control apparatus.

　以下、実施形態を説明する。 Hereinafter, embodiments will be described.

　〔第１実施形態〕
　図１は本開示の第１実施形態の低能力室内機２０Ｃを備えたマルチ型空気調和機の構成図である。 [First Embodiment]
FIG. 1 is a configuration diagram of a multi-type air conditioner including the low-capacity indoor unit 20C according to the first embodiment of the present disclosure.

　この第１実施形態のマルチ型空気調和機は、図１に示すように、室内熱交換器４Ａと室内ファン５Ａを有する室内機２０Ａと、室内熱交換器４Ｂと室内ファン５Ｂを有する室内機２０Ｂと、室内熱交換器４Ｃと室内ファン５Ｃを有する低能力室内機２０Ｃと、室内機２０Ａ,２０Ｂおよび低能力室内機２０Ｃに冷媒配管を介して接続された専用室外機１０とを備えている。 As shown in FIG. 1, the multi-type air conditioner of the first embodiment includes an indoor unit 20A having an indoor heat exchanger 4A and an indoor fan 5A, and an indoor unit 20B having an indoor heat exchanger 4B and an indoor fan 5B. And a low-capacity indoor unit 20C having an indoor heat exchanger 4C and an indoor fan 5C, and a dedicated outdoor unit 10 connected to the indoor units 20A and 20B and the low-capacity indoor unit 20C via a refrigerant pipe.

　専用室外機１０は、複数の室内機が接続可能なマルチ型空気調和機に対応しており、低能力室内機２０Ｃは、マルチ型空気調和機の室内機として動作可能である。 The dedicated outdoor unit 10 corresponds to a multi-type air conditioner to which a plurality of indoor units can be connected, and the low-capacity indoor unit 20C can operate as an indoor unit of the multi-type air conditioner.

　図１において、１は圧縮機、２は圧縮機１の吐出側に一端が接続された四路切換弁、３は四路切換弁２の他端に一端が接続された室外熱交換器、ＥＶＡ,ＥＶＢ,ＥＶＣは室外熱交換器３の他端に一端が夫々接続された電動膨脹弁、４Ａ,４Ｂ,４Ｃは電動膨脹弁ＥＶＡ,ＥＶＢ,ＥＶＣの他端に一端が夫々接続された室内熱交換器、６は室内熱交換器４Ａ,４Ｂ,４Ｃの他端に四路切換弁２を介して一端が接続され、他端が圧縮機１の吸入側に接続されたアキュムレータである。室内熱交換器４Ａ,４Ｂ,４Ｃ近傍に室内ファン５Ａ,５Ｂ,５Ｃを夫々配置している。 In FIG. 1, 1 is a compressor, 2 is a four-way switching valve with one end connected to the discharge side of the compressor 1, 3 is an outdoor heat exchanger with one end connected to the other end of the four-way switching valve 2, EVA , EVB, EVC are electric expansion valves having one end connected to the other end of the outdoor heat exchanger 3, respectively. An exchanger 6 is an accumulator in which one end is connected to the other end of the indoor heat exchangers 4A, 4B, and 4C via the four-way switching valve 2 and the other end is connected to the suction side of the compressor 1. Indoor fans 5A, 5B, 5C are arranged in the vicinity of the indoor heat exchangers 4A, 4B, 4C, respectively.

　また、電動膨脹弁ＥＶＡ,ＥＶＢ,ＥＶＣの他端に複数の冷媒配管接続部７Ａ,７Ｂ,７Ｃが接続され、その複数の冷媒配管接続部７Ａ,７Ｂ,７Ｃに連絡配管(冷媒配管)を介して室内熱交換器４Ａ,４Ｂ,４Ｃの一端を夫々接続している。また、室内熱交換器４Ａ,４Ｂ,４Ｃの他端に連絡配管(冷媒配管)を介して複数の冷媒配管接続部８Ａ,８Ｂ,８Ｃが接続されている。 Also, a plurality of refrigerant pipe connection portions 7A, 7B, 7C are connected to the other ends of the electric expansion valves EVA, EVB, EVC, and the plurality of refrigerant pipe connection portions 7A, 7B, 7C are connected to the other refrigerant piping connection ports (refrigerant pipes). One end of each of the indoor heat exchangers 4A, 4B, 4C is connected. A plurality of refrigerant pipe connection portions 8A, 8B, and 8C are connected to the other ends of the indoor heat exchangers 4A, 4B, and 4C through connection pipes (refrigerant pipes).

　上記圧縮機１と四路切換弁２と室外熱交換器３と電動膨脹弁ＥＶＡ,ＥＶＢ,ＥＶＣと室内熱交換器４Ａ,４Ｂ,４Ｃおよびアキュムレータ６で冷媒回路を構成している。この冷媒回路には、微燃性のＲ３２冷媒が充填されている。 The compressor 1, the four-way switching valve 2, the outdoor heat exchanger 3, the electric expansion valves EVA, EVB, EVC, the indoor heat exchangers 4A, 4B, 4C, and the accumulator 6 constitute a refrigerant circuit. This refrigerant circuit is filled with a slightly flammable R32 refrigerant.

　また、上記圧縮機１の吐出側に吐出管温度センサ１１を設けている。また、室外熱交換器３に室外熱交換器温度を検出する室外熱交換器温度センサ１２を設けると共に、室外熱交換器３の近傍に室外温度を検出する室外温度センサ１３を設けている。 Further, a discharge pipe temperature sensor 11 is provided on the discharge side of the compressor 1. The outdoor heat exchanger 3 is provided with an outdoor heat exchanger temperature sensor 12 for detecting the outdoor heat exchanger temperature, and an outdoor temperature sensor 13 for detecting the outdoor temperature is provided in the vicinity of the outdoor heat exchanger 3.

　また、室内熱交換器４Ａに室内熱交換器温度を検出する室内熱交換器温度センサ１５Ａを設け、室内熱交換器４Ａの近傍に室内温度を検出する室内温度センサ１６Ａを設けている。また、室内熱交換器４Ｂに室内熱交換器温度を検出する室内熱交換器温度センサ１５Ｂを設け、室内熱交換器４Ｂの近傍に室内温度を検出する室内温度センサ１６Ｂを設けている。また、室内熱交換器４Ｃに室内熱交換器温度を検出する室内熱交換器温度センサ１５Ｃを設け、室内熱交換器４Ｃの近傍に室内温度を検出する室内温度センサ１６Ｃを設けている。 Also, the indoor heat exchanger 4A is provided with an indoor heat exchanger temperature sensor 15A that detects the temperature of the indoor heat exchanger, and an indoor temperature sensor 16A that detects the indoor temperature is provided near the indoor heat exchanger 4A. The indoor heat exchanger 4B is provided with an indoor heat exchanger temperature sensor 15B that detects the temperature of the indoor heat exchanger, and an indoor temperature sensor 16B that detects the indoor temperature is provided near the indoor heat exchanger 4B. The indoor heat exchanger 4C is provided with an indoor heat exchanger temperature sensor 15C that detects the temperature of the indoor heat exchanger, and an indoor temperature sensor 16C that detects the indoor temperature is provided near the indoor heat exchanger 4C.

　上記専用室外機１０は、マイクロコンピュータと入出力回路などからなる室外制御装置１８を備えている。室外制御装置１８は、圧縮機１と電動膨脹弁ＥＶＡ,ＥＶＢ,ＥＶＣなどを制御する運転制御部１８ａと、通信部１８ｂとを有する。また、室内機２０Ａ,２０Ｂは、図示しない室内制御装置を夫々備えており、低能力室内機２０Ｃは、図２に示す室内制御装置１００を備えている。 The dedicated outdoor unit 10 includes an outdoor control device 18 including a microcomputer and an input / output circuit. The outdoor control device 18 includes an operation control unit 18a that controls the compressor 1, the electric expansion valves EVA, EVB, EVC, and the like, and a communication unit 18b. Each of the indoor units 20A and 20B includes an indoor control device (not shown), and the low-capacity indoor unit 20C includes the indoor control device 100 illustrated in FIG.

　室内機２０Ａ,２０Ｂの各室内制御装置および低能力室内機２０Ｃの室内制御装置１００は、専用室外機１０の室外制御装置１８と通信線(図示せず)を介して互いに通信を行うことにより、室外制御装置１８と室内機２０Ａ,２０Ｂの室内制御装置および低能力室内機２０Ｃの室内制御装置１００が協調動作することにより、マルチ型空気調和機として動作する。 The indoor control devices of the indoor units 20A and 20B and the indoor control device 100 of the low-capacity indoor unit 20C communicate with each other via the communication line (not shown) with the outdoor control device 18 of the dedicated outdoor unit 10, The outdoor control device 18 and the indoor control devices of the indoor units 20A and 20B and the indoor control device 100 of the low-capacity indoor unit 20C operate in cooperation, thereby operating as a multi-type air conditioner.

　上記マルチ型空気調和機において、室内機２０Ａ,２０Ｂおよび低能力室内機２０Ｃで冷房運転を行う場合、四路切換弁２を点線の位置に切り換えて、圧縮機１の運転を開始する。そして、電動膨脹弁ＥＶＡ,ＥＶＢ,ＥＶＣを夫々所定の開度に開く。そして、圧縮機１から吐出した高温高圧のガス冷媒は、室外熱交換器３で室外ファン(図示せず)を運転することにより室外空気との熱交換により凝縮して液冷媒となる。次に、室内熱交換器４Ａ,４Ｂ,４Ｃからの液冷媒は、電動膨脹弁ＥＶＡ,ＥＶＢ,ＥＶＣで減圧された後、室内ファン５Ａ,５Ｂ,５Ｃを運転することにより室内熱交換器４Ａ,４Ｂ,４Ｃで室内空気との熱交換により蒸発してガス冷媒となり、圧縮機１の吸入側に戻る。 In the above-described multi-type air conditioner, when the cooling operation is performed by the indoor units 20A and 20B and the low-capacity indoor unit 20C, the four-way switching valve 2 is switched to the dotted line position and the operation of the compressor 1 is started. Then, the electric expansion valves EVA, EVB, EVC are each opened to a predetermined opening degree. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is condensed by a heat exchange with the outdoor air by operating an outdoor fan (not shown) in the outdoor heat exchanger 3 to become a liquid refrigerant. Next, the liquid refrigerant from the indoor heat exchangers 4A, 4B, 4C is decompressed by the electric expansion valves EVA, EVB, EVC, and then the indoor fans 5A, 5B, 5C are operated to operate the indoor heat exchanger 4A, At 4B and 4C, it evaporates by heat exchange with room air to become a gas refrigerant, and returns to the suction side of the compressor 1.

　ここで、室内機２０Ａ,２０Ｂの定格冷房能力は２.２ｋＷであり、低能力室内機２０Ｃの定格冷房能力は０.８ｋＷである。すなわち、低能力室内機２０Ｃは、室内機２０Ａ,２０Ｂよりも能力が低い。 Here, the rated cooling capacity of the indoor units 20A and 20B is 2.2 kW, and the rated cooling capacity of the low capacity indoor unit 20C is 0.8 kW. That is, the low-capacity indoor unit 20C has a lower capacity than the indoor units 20A and 20B.

　一方、室内機２０Ａ,２０Ｂおよび低能力室内機２０Ｃで暖房運転を行う場合、四路切換弁２を実線の位置に切り換えて、圧縮機１の運転を開始する。そして、電動膨脹弁ＥＶＡ,ＥＶＢ,ＥＶＣを夫々所定の開度に開く。そして、圧縮機１から吐出した高温高圧のガス冷媒は、室内ファン５Ａ,５Ｂ,５Ｃを運転することにより室内熱交換器４Ａ,４Ｂ,４Ｃで室内空気との熱交換により凝縮して液冷媒となる。次に、室内熱交換器４Ａ,４Ｂ,４Ｃからの液冷媒は、電動膨脹弁ＥＶＡ,ＥＶＢ,ＥＶＣで減圧された後、室外熱交換器３で室外ファン(図示せず)を運転することにより室外空気との熱交換により蒸発してガス冷媒となり、圧縮機１の吸入側に戻る。 On the other hand, when heating operation is performed with the indoor units 20A and 20B and the low-capacity indoor unit 20C, the four-way switching valve 2 is switched to the position of the solid line, and the operation of the compressor 1 is started. Then, the electric expansion valves EVA, EVB, EVC are each opened to a predetermined opening degree. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 is condensed by heat exchange with indoor air in the indoor heat exchangers 4A, 4B, and 4C by operating the indoor fans 5A, 5B, and 5C. Become. Next, the liquid refrigerant from the indoor heat exchangers 4A, 4B, 4C is decompressed by the electric expansion valves EVA, EVB, EVC, and then an outdoor fan (not shown) is operated by the outdoor heat exchanger 3. It evaporates by heat exchange with the outdoor air to become a gas refrigerant and returns to the suction side of the compressor 1.

　図２は低能力室内機２０Ｃを斜め下方から見た外観図である。この室内機は、天井埋め込み型の室内機である。 FIG. 2 is an external view of the low-capacity indoor unit 20C viewed obliquely from below. This indoor unit is a ceiling-embedded indoor unit.

　この低能力室内機２０Ｃは、図２に示すように、ケーシング本体１０１と、ケーシング本体１０１の下側に取り付けられた矩形状のパネル１０２と、パネル１０２に着脱可能に取り付けられたグリル１０３とを備えている。 As shown in FIG. 2, the low-capacity indoor unit 20C includes a casing main body 101, a rectangular panel 102 attached to the lower side of the casing main body 101, and a grill 103 detachably attached to the panel 102. I have.

　パネル１０２の長手方向の一方に、パネル１０２の短辺に沿って吹出口１１０を設けている。また、パネル１０２にフラップ１２０を回動可能に取り付けている。図２では、フラップ１２０により吹出口１１０が閉じられた状態を示す。 The blower outlet 110 is provided along the short side of the panel 102 on one side in the longitudinal direction of the panel 102. A flap 120 is rotatably attached to the panel 102. FIG. 2 shows a state in which the air outlet 110 is closed by the flap 120.

　また、ケーシング本体１０１の側壁から突出するようにドレンソケット１０７を設けている。このドレンソケット１０７に外部からドレンホース(図示せず)を接続する。また、配管接続部１０５,１０６を、ケーシング本体１０１の側壁から突出するように設けている。この配管接続部１０５,１０６に、外部から冷媒配管(図示せず)を接続する。 Further, a drain socket 107 is provided so as to protrude from the side wall of the casing body 101. A drain hose (not shown) is connected to the drain socket 107 from the outside. Further, the pipe connecting portions 105 and 106 are provided so as to protrude from the side wall of the casing main body 101. A refrigerant pipe (not shown) is connected to the pipe connecting portions 105 and 106 from the outside.

　なお、図２において、１０８は電装品部であり、１１１～１１３は、ケーシング本体１０１から側方に突出するように夫々設けられた吊り金具である。 In FIG. 2, reference numeral 108 denotes an electrical component part, and reference numerals 111 to 113 denote suspension fittings provided so as to protrude laterally from the casing main body 101, respectively.

　また、図３は低能力室内機２０Ｃの室内制御装置１００のブロック図である。 FIG. 3 is a block diagram of the indoor control device 100 of the low-capacity indoor unit 20C.

　上記低能力室内機２０Ｃは、図３に示すように、マイクロコンピュータと入出力回路などからなる室内制御装置１００を備えている。室内制御装置１００は、運転制御部１００ａと、通信部１００ｂと、機種判定部１００ｃと、報知部１００ｄとを有する。 The low-capacity indoor unit 20C includes an indoor control device 100 including a microcomputer and an input / output circuit as shown in FIG. The indoor control device 100 includes an operation control unit 100a, a communication unit 100b, a model determination unit 100c, and a notification unit 100d.

　運転制御部１００ａは、室内温度センサ１６Ｃと室内熱交換器温度センサ１５Ｃの検出信号に基づいて、ファンモータ２１やフラップ駆動部２２を制御する。 The operation control unit 100a controls the fan motor 21 and the flap driving unit 22 based on detection signals from the indoor temperature sensor 16C and the indoor heat exchanger temperature sensor 15C.

　通信部１００ｂは、低能力室内機２０Ｃに接続された専用室外機１０の室外制御装置１８(図１に示す)との通信を通信部１８ｂを介して行う。 The communication unit 100b performs communication with the outdoor control device 18 (shown in FIG. 1) of the dedicated outdoor unit 10 connected to the low-capacity indoor unit 20C via the communication unit 18b.

　機種判定部１００ｃは、通信部１００ｂにより受信された室外機の機種ＩＤに基づいて、接続された室外機が、低能力室内機２０Ｃとの組み合わせが許可された専用室外機か否かを判定する。 The model determination unit 100c determines whether the connected outdoor unit is a dedicated outdoor unit permitted to be combined with the low-capacity indoor unit 20C based on the model ID of the outdoor unit received by the communication unit 100b. .

　報知部１００ｄは、接続された室外機が、上記組み合わせが許可された専用室外機でないと機種判定部１００ｃが判定すると、表示部２３の電源ランプを点滅させて、異常を知らせる。ここで、電源ランプを点滅と同時に、ブザー音を発するようにしてもよい。また、異常を報知する手段は、電源ランプやブザー音に限らず、表示部や音声出力などにより異常を知らせてもよい。 When the model determination unit 100c determines that the connected outdoor unit is not a dedicated outdoor unit for which the above combination is permitted, the notification unit 100d blinks the power lamp of the display unit 23 to notify the abnormality. Here, a buzzer sound may be emitted simultaneously with blinking of the power lamp. Further, the means for notifying the abnormality is not limited to the power lamp or the buzzer sound, and the abnormality may be notified by a display unit, audio output, or the like.

　図４は室内制御装置１００の動作を説明するフローチャートである。 FIG. 4 is a flowchart for explaining the operation of the indoor control device 100.

　まず、低能力室内機２０Ｃに室外機が接続され、電源が最初に投入されたとき、室内制御装置１００の動作がスタートする。 First, when the outdoor unit is connected to the low-capacity indoor unit 20C and the power is first turned on, the operation of the indoor control device 100 starts.

　そして、図４に示すステップＳ１で低能力室内機２０Ｃに室外機が接続されたか否かを判定し、低能力室内機２０Ｃに室外機が接続されたと判定すると、ステップＳ２に進む。一方、低能力室内機２０Ｃに室外機が接続されていないときは、ステップＳ１を繰り返す。 Then, in step S1 shown in FIG. 4, it is determined whether or not the outdoor unit is connected to the low-capacity indoor unit 20C. If it is determined that the outdoor unit is connected to the low-capacity indoor unit 20C, the process proceeds to step S2. On the other hand, when the outdoor unit is not connected to the low-capacity indoor unit 20C, step S1 is repeated.

　そして、ステップＳ２で通信部１００ｂにより室外機から機種ＩＤを取得する。 In step S2, the model ID is acquired from the outdoor unit by the communication unit 100b.

　次に、ステップＳ３に進み、室外機から取得された機種ＩＤに基づいて、接続された室外機が、組み合わせが許可された専用室外機か否かを機種判定部１００ｃにより判定する。 Next, the process proceeds to step S3, and based on the model ID acquired from the outdoor unit, the model determination unit 100c determines whether the connected outdoor unit is a dedicated outdoor unit permitted to be combined.

　ステップＳ３で専用室外機であると判定すると、ステップＳ４に進む一方、専用室外機でないと判定すると、ステップＳ５に進み、報知部１００ｄにより異常を報知して、処理を終了する。 If it is determined in step S3 that the unit is a dedicated outdoor unit, the process proceeds to step S4. On the other hand, if it is determined that the unit is not a dedicated outdoor unit, the process proceeds to step S5.

　そして、ステップＳ４では、通常運転すなわち冷房運転または暖房運転をリモートコントローラなどからの指令に従って行う。 In step S4, normal operation, that is, cooling operation or heating operation is performed according to a command from a remote controller or the like.

　上記構成の低能力室内機２０Ｃによれば、定格冷房能力が２.２ｋＷ未満であり、組み合わせが許可された専用室外機１０以外の室外機に接続されたときに報知部１００ｄにより異常を報知する。したがって、専用室外機１０以外の冷媒充填量が多い他の室外機が接続されて運転されることがなくなり、冷媒漏洩時のリスクを低減できる。 According to the low-capacity indoor unit 20C having the above-described configuration, when the rated cooling capacity is less than 2.2 kW and connected to an outdoor unit other than the dedicated outdoor unit 10 that is permitted to be combined, the notification unit 100d notifies the abnormality. . Therefore, other outdoor units with a large amount of refrigerant other than the dedicated outdoor unit 10 are not connected and operated, and the risk of refrigerant leakage can be reduced.

　ここで、専用室外機１０の許容冷媒充填量は、専用室外機１０と、その専用室外機１０に接続された最大数の室内機とで構成されるマルチ型空気調和機において、各室内機が最大配管長で接続されたときに冷媒回路に充填される冷媒充填量である。 Here, the allowable refrigerant filling amount of the dedicated outdoor unit 10 is such that each indoor unit is a multi-type air conditioner configured of the dedicated outdoor unit 10 and the maximum number of indoor units connected to the dedicated outdoor unit 10. This is the refrigerant filling amount that fills the refrigerant circuit when connected with the maximum pipe length.

　専用室外機１０の許容冷媒充填量は、１.８ｋｇとしている。この場合、設置箇所が洗面所などを想定して部屋面積３.３ｍ２×天井高さ２.４ｍとしたとき、冷媒漏洩時の最大濃度は、０.２２７ｋｇ／ｍ３(≒１.８ｋｇ(３.３ｍ２×２.４ｍ))以下となる。 The allowable refrigerant filling amount of the dedicated outdoor unit 10 is 1.8 kg. In this case, assuming that the installation location is a washroom, etc., and the room area is 3.3 m 2 × the ceiling height is 2.4 m, the maximum concentration at the time of refrigerant leakage is 0.227 kg / m 3 (≈1.8 kg ( 3.3 m 2 × 2.4 m)) or less.

　家庭用のマルチ型空気調和機において、許容冷媒充填量は４.０ｋｇとしている。この場合、設置箇所が居室やキッチンなどを想定して部屋面積約７ｍ２×天井高さ２.４ｍとしたとき、冷媒漏洩時の最大濃度を０.２３８ｋｇ／ｍ３(≒４.０ｋｇ(７ｍ２×２.４ｍ))以下としている。これに対して、洗面所などの狭い空間(３.３ｍ２×２.４ｍ)への冷媒漏洩であっても、低能力室内機２０Ｃを含むマルチ型空気調和機の冷媒漏洩時の最大濃度(０.２２７以下)は小さく、冷媒漏洩に対してより安全である。 In the multi-type air conditioner for home use, the allowable refrigerant charging amount is 4.0 kg. In this case, assuming that the installation location is a room or kitchen, and the room area is about 7 m 2 × ceiling height is 2.4 m, the maximum concentration at the time of refrigerant leakage is 0.238 kg / m 3 (≈4.0 kg (7 m 2 x 2.4 m)) or less. On the other hand, even when the refrigerant leaks into a narrow space (3.3 m 2 × 2.4 m) such as a washroom, the maximum concentration (when the refrigerant leaks in the multi-type air conditioner including the low-capacity indoor unit 20C) 0.227 or less) is small and safer against refrigerant leakage.

　また、低能力室内機２０Ｃの定格冷房能力が１.６ｋＷ(この実施形態では０.８ｋＷ)以下であるので、洗面所などの狭い空間の空気調和に適しており、狭い空間における冷媒漏洩時の安全性も高い。 Moreover, since the rated cooling capacity of the low-capacity indoor unit 20C is 1.6 kW or less (0.8 kW in this embodiment), it is suitable for air conditioning in a narrow space such as a washroom, and at the time of refrigerant leakage in the narrow space. High safety.

　また、低能力室内機２０Ｃを少なくとも１つ含む複数の室内機が専用室外機１０に接続されたマルチ型空気調和機を提供できる。 Also, a multi-type air conditioner in which a plurality of indoor units including at least one low-capacity indoor unit 20C is connected to the dedicated outdoor unit 10 can be provided.

　上記第１実施形態では、低能力室内機２０Ｃ側に機種判定部１００ｃと報知部１００ｄを備えたが、専用室外機１０側に機種判定部と報知部を備えてもよい。 In the first embodiment, the model determination unit 100c and the notification unit 100d are provided on the low-capacity indoor unit 20C side. However, the model determination unit and the notification unit may be provided on the dedicated outdoor unit 10 side.

　〔第２実施形態〕
　図５は本開示の第２実施形態の低能力室内機２０Ｃの室内制御装置２００のブロック図である。この第２実施形態の低能力室内機２０Ｃは、室内制御装置２００を除いて第１実施形態の低能力室内機２０Ｃと同一の構成をしている。 [Second Embodiment]
FIG. 5 is a block diagram of the indoor control device 200 of the low-capacity indoor unit 20C according to the second embodiment of the present disclosure. The low-capacity indoor unit 20C of the second embodiment has the same configuration as the low-capacity indoor unit 20C of the first embodiment except for the indoor control device 200.

　この低能力室内機２０Ｃは、図５に示すように、マイクロコンピュータと入出力回路などからなる室内制御装置２００を備えている。室内制御装置２００は、運転制御部２００ａと、通信部２００ｂと、許容冷媒充填量判定部２００ｃと、報知部２００ｄとを有する。 As shown in FIG. 5, the low-capacity indoor unit 20C includes an indoor control device 200 including a microcomputer and an input / output circuit. The indoor control device 200 includes an operation control unit 200a, a communication unit 200b, an allowable refrigerant filling amount determination unit 200c, and a notification unit 200d.

　運転制御部２００ａは、室内温度センサ１６Ｃと室内熱交換器温度センサ１５Ｃの検出信号に基づいて、ファンモータ２１やフラップ駆動部２２を制御する。 The operation control unit 200a controls the fan motor 21 and the flap drive unit 22 based on detection signals from the indoor temperature sensor 16C and the indoor heat exchanger temperature sensor 15C.

　通信部２００ｂは、低能力室内機２０Ｃに接続された専用室外機１０の室外制御装置１８(図１に示す)との通信を通信部１８ｂを介して行う。 The communication unit 200b performs communication with the outdoor control device 18 (shown in FIG. 1) of the dedicated outdoor unit 10 connected to the low-capacity indoor unit 20C via the communication unit 18b.

　許容冷媒充填量判定部２００ｃは、通信部２００ｂにより受信された室外機からの許容冷媒充填量Ｘが、低能力室内機２０Ｃの定格冷房能力０.８ｋＷから予め算出された許容冷媒充填量Ａよりも多いか否かを判定する。 The allowable refrigerant charge amount determination unit 200c uses an allowable refrigerant charge amount A calculated in advance from the rated cooling capacity 0.8 kW of the low-capacity indoor unit 20C so that the allowable refrigerant charge amount X received from the outdoor unit is received by the communication unit 200b. It is determined whether there are too many.

　ここで、低能力室内機２０Ｃの定格冷房能力０.８ｋＷから、例えば適用する部屋の床面積(３.３ｍ２)と天井高さ(２.４ｍ)から容積を求め、その容積の室内に冷媒が漏洩したときに、冷媒漏洩時の最大濃度が０.２２７ｋｇ／ｍ３(≒１.８ｋｇ(３.３ｍ２×２.４ｍ))以下となる許容冷媒充填量Ａを算出しておく。 Here, from the rated cooling capacity of 0.8 kW of the low-capacity indoor unit 20C, for example, the volume is obtained from the floor area (3.3 m 2 ) and the ceiling height (2.4 m) of the room to be applied, and the refrigerant is placed in the room of that volume. When the refrigerant leaks, an allowable refrigerant charging amount A is calculated so that the maximum concentration at the time of refrigerant leakage is 0.227 kg / m 3 (≈1.8 kg (3.3 m 2 × 2.4 m)) or less.

　報知部２００ｄは、接続される室外機からの許容冷媒充填量Ｘが、低能力室内機２０Ｃの定格冷房能力から予め算出された許容冷媒充填量Ａよりも多いと許容冷媒充填量判定部２００ｃが判定すると、表示部２３の電源ランプを点滅させて、異常を知らせる。ここで、電源ランプを点滅と同時に、ブザー音を発するようにしてもよい。また、異常を報知する手段は、電源ランプやブザー音に限らず、表示部や音声出力などにより異常を知らせてもよい。 When the allowable refrigerant charging amount X from the connected outdoor unit is larger than the allowable refrigerant charging amount A calculated in advance from the rated cooling capacity of the low-capacity indoor unit 20C, the notification unit 200d determines that the allowable refrigerant charging amount determination unit 200c If determined, the power lamp of the display unit 23 blinks to notify the abnormality. Here, a buzzer sound may be emitted simultaneously with blinking of the power lamp. Further, the means for notifying the abnormality is not limited to the power lamp or the buzzer sound, and the abnormality may be notified by a display unit, audio output, or the like.

　図６は、室内制御装置２００の動作を説明するフローチャートである。 FIG. 6 is a flowchart for explaining the operation of the indoor control device 200.

　まず、低能力室内機２０Ｃに室外機が接続され、電源が最初に投入されたとき、室内制御装置２００の動作がスタートする。 First, when an outdoor unit is connected to the low-capacity indoor unit 20C and the power is first turned on, the operation of the indoor control device 200 starts.

　そして、図６に示すステップＳ１１で低能力室内機２０Ｃに室外機が接続されたか否かを判定し、低能力室内機２０Ｃに室外機が接続されたと判定すると、ステップＳ１２に進む。一方、低能力室内機２０Ｃに室外機が接続されていないときは、ステップＳ１１を繰り返す。 Then, in step S11 shown in FIG. 6, it is determined whether or not the outdoor unit is connected to the low-capacity indoor unit 20C. If it is determined that the outdoor unit is connected to the low-capacity indoor unit 20C, the process proceeds to step S12. On the other hand, when the outdoor unit is not connected to the low-capacity indoor unit 20C, step S11 is repeated.

　そして、ステップＳ１２で通信部２００ｂにより室外機から許容冷媒充填量Ｘを取得する。 In step S12, the allowable refrigerant charge amount X is acquired from the outdoor unit by the communication unit 200b.

　次に、ステップＳ１３に進み、室外機の許容冷媒充填量Ｘが、低能力室内機２０Ｃの定格冷房能力から予め算出された許容冷媒充填量Ａよりも多いか否かを許容冷媒充填量判定部２００ｃにより判定する。 Next, the process proceeds to step S13, and an allowable refrigerant charge amount determination unit determines whether or not the allowable refrigerant charge amount X of the outdoor unit is larger than the allowable refrigerant charge amount A calculated in advance from the rated cooling capacity of the low-capacity indoor unit 20C. Determined by 200c.

　ステップＳ１３で許容冷媒充填量Ｘが許容冷媒充填量Ａよりも多いと判定すると、ステップＳ１５に進み、報知部１００ｄにより異常を報知して、処理を終了する。一方、ステップＳ１３で許容冷媒充填量Ｘが許容冷媒充填量Ａ以下であると判定すると、ステップＳ１４に進む。 If it is determined in step S13 that the allowable refrigerant charge amount X is larger than the allowable refrigerant charge amount A, the process proceeds to step S15, the abnormality is notified by the notification unit 100d, and the process is terminated. On the other hand, if it is determined in step S13 that the allowable refrigerant charging amount X is equal to or smaller than the allowable refrigerant charging amount A, the process proceeds to step S14.

　そして、ステップＳ１４では、通常運転すなわち冷房運転または暖房運転をリモートコントローラなどからの指令に従って行う。 In step S14, normal operation, that is, cooling operation or heating operation is performed according to a command from a remote controller or the like.

　上記構成の低能力室内機２０Ｃによれば、専用室外機１０の許容冷媒充填量Ｘを、低能力室内機２０Ｃの定格冷房能力から予め算出された許容冷媒充填量Ａよりも小さく設定することによって、低能力室内機２０Ｃが専用室外機１０に接続されたとき、報知部２００ｄは、異常を報知しない。これに対して、専用室外機１０以外の室外機が接続されたとき、通知される該室外機の許容冷媒充填量Ｘが、上記定格冷房能力から予め算出された許容冷媒充填量Ａよりも多いので、報知部２００ｄにより異常を報知する。 According to the low-capacity indoor unit 20C configured as described above, the allowable refrigerant charge amount X of the dedicated outdoor unit 10 is set smaller than the allowable refrigerant charge amount A calculated in advance from the rated cooling capacity of the low-capacity indoor unit 20C. When the low-capacity indoor unit 20C is connected to the dedicated outdoor unit 10, the notification unit 200d does not notify the abnormality. On the other hand, when an outdoor unit other than the dedicated outdoor unit 10 is connected, the allowable refrigerant charge amount X of the outdoor unit notified is larger than the allowable refrigerant charge amount A calculated in advance from the rated cooling capacity. Therefore, the notification unit 200d notifies the abnormality.

　上記第２実施形態では、低能力室内機２０Ｃ側に許容冷媒充填量判定部２００ｃを備えたが、専用室外機１０側に許容冷媒充填量判定部を備えてもよい。 In the second embodiment, the allowable refrigerant filling amount determination unit 200c is provided on the low-capacity indoor unit 20C side, but an allowable refrigerant filling amount determination unit may be provided on the dedicated outdoor unit 10 side.

　上記第１,第２実施形態では、室外機から取得された機種ＩＤに基づいて、接続された室外機が専用室外機１０か否かを判定したり、室外機からの許容冷媒充填量Ｘが、低能力室内機２０Ｃの定格冷房能力から予め算出された許容冷媒充填量Ａよりも多いか否かを判定したりしたが、接続された室外機が、組み合わせが許可された専用室外機か否かを判定する手段は、これらに限らない。 In the first and second embodiments, based on the model ID acquired from the outdoor unit, it is determined whether the connected outdoor unit is the dedicated outdoor unit 10 or the allowable refrigerant charge amount X from the outdoor unit is It is determined whether or not the allowable refrigerant charging amount A calculated in advance from the rated cooling capacity of the low-capacity indoor unit 20C is larger than the allowable refrigerant charging amount A, but the connected outdoor unit is a dedicated outdoor unit that is permitted to be combined. The means for determining is not limited to these.

　また、上記第１,第２実施形態では、専用室外機１０と、その専用室外機１０に接続された複数の室内機(低能力室内機２０Ｃを含む)とを備えたマルチ型空気調和機について説明したが、専用室外機と低能力室内機とが一対一で接続された空気調和機であってもよい。 In the first and second embodiments, the multi-type air conditioner includes the dedicated outdoor unit 10 and a plurality of indoor units (including the low-capacity indoor unit 20C) connected to the dedicated outdoor unit 10. Although described, an air conditioner in which a dedicated outdoor unit and a low-capacity indoor unit are connected one-to-one may be used.

　本開示の具体的な実施の形態について説明したが、本開示は上記第１,第２実施形態に限定されるものではなく、本開示の範囲内で種々変更して実施することができる。 Although specific embodiments of the present disclosure have been described, the present disclosure is not limited to the first and second embodiments described above, and various modifications can be made within the scope of the present disclosure.

　１…圧縮機
　２…四路切換弁
　３…室外熱交換器
　４Ａ,４Ｂ,４Ｃ…室内熱交換器
　５Ａ,５Ｂ,５Ｃ…室内ファン
　６…アキュムレータ
　７Ａ,７Ｂ,７Ｃ…冷媒配管接続部
　８Ａ,８Ｂ,８Ｃ…冷媒配管接続部
　１０…専用室外機
　１１…吐出管温度センサ
　１２…室外熱交換器温度センサ
　１３…室外温度センサ
　１５Ａ,１５Ｂ,１５Ｃ…室内熱交換器温度センサ
　１６Ａ,１６Ｂ,１６Ｃ…室内温度センサ
　１８…室外制御装置
　１８ａ…運転制御部
　１８ｂ…通信部
　２０Ａ,２０Ｂ…室内機
　２０Ｃ…低能力室内機
　１００…室内制御装置
　１００ａ…運転制御部
　１００ｂ…通信部
　１００ｃ…機種判定部
　１００ｄ…報知部
　２００…室内制御装置
　２００ａ…運転制御部
　２００ｂ…通信部
　２００ｃ…許容冷媒充填量判定部
　２００ｄ…報知部
　ＥＶＡ,ＥＶＢ,ＥＶＣ…電動膨脹弁 DESCRIPTION OF SYMBOLS 1 ... Compressor 2 ... Four-way selector valve 3 ... Outdoor heat exchanger 4A, 4B, 4C ... Indoor heat exchanger 5A, 5B, 5C ... Indoor fan 6 ... Accumulator 7A, 7B, 7C ... Refrigerant piping connection part 8A, 8B , 8C ... Refrigerant piping connection part 10 ... Dedicated outdoor unit 11 ... Discharge pipe temperature sensor 12 ... Outdoor heat exchanger temperature sensor 13 ... Outdoor temperature sensor 15A, 15B, 15C ... Indoor heat exchanger temperature sensor 16A, 16B, 16C ... Indoor Temperature sensor 18 ... Outdoor control device 18a ... Operation control unit 18b ... Communication unit 20A, 20B ... Indoor unit 20C ... Low-capacity indoor unit 100 ... Indoor control device 100a ... Operation control unit 100b ... Communication unit 100c ... Model determination unit 100d ... Notification 200: Indoor control device 200a: Operation control unit 200b ... Communication unit 200c ... Allowable refrigerant filling amount determination unit 200d ... Notification unit EVA, EVB, EVC ... Electric expansion Valve

Claims (4)

　定格冷房能力が２.２ｋＷ未満であって、
　組み合わせが許可された専用室外機(１０)以外の室外機に接続されたときに異常を報知する報知部(１００ｄ,2００ｄ)を備えたことを特徴とする低能力室内機(２０Ｃ)。 The rated cooling capacity is less than 2.2 kW,
A low-capacity indoor unit (20C) comprising a notification unit (100d, 200d) for notifying abnormality when connected to an outdoor unit other than the dedicated outdoor unit (10) for which the combination is permitted. 　請求項１に記載の低能力室内機(２０Ｃ)において、
　上記定格冷房能力が１.６ｋＷ以下であることを特徴とする低能力室内機(２０Ｃ)。 In the low capacity indoor unit (20C) according to claim 1,
The low-capacity indoor unit (20C), wherein the rated cooling capacity is 1.6 kW or less. 　請求項１または２に記載の低能力室内機(２０Ｃ)において、
　上記専用室外機(１０)は、複数の室内機(２０Ａ,２０Ｂ,２０Ｃ)が接続可能なマルチ型空気調和機に対応しており、
　上記低能力室内機(２０Ｃ)は、上記マルチ型空気調和機の室内機として動作可能であって、上記複数の室内機(２０Ａ,２０Ｂ,２０Ｃ)のうちの少なくとも１つであることを特徴とする低能力室内機(２０Ｃ)。 The low capacity indoor unit (20C) according to claim 1 or 2,
The dedicated outdoor unit (10) corresponds to a multi-type air conditioner to which a plurality of indoor units (20A, 20B, 20C) can be connected,
The low-capacity indoor unit (20C) is operable as an indoor unit of the multi-type air conditioner and is at least one of the plurality of indoor units (20A, 20B, 20C). Low capacity indoor unit (20C). 　請求項１から３までのいずれか１つに記載の低能力室内機(２０Ｃ)において、
　上記報知部(2００ｄ)は、
　接続された室外機から通知される該室外機の許容冷媒充填量が、上記定格冷房能力から予め算出された許容冷媒充填量よりも多いとき、異常を報知することを特徴とする低能力室内機(２０Ｃ)。 In the low capacity indoor unit (20C) according to any one of claims 1 to 3,
The notification unit (200d)
A low-capacity indoor unit that reports an abnormality when the allowable refrigerant charge amount of the outdoor unit notified from the connected outdoor unit is larger than the allowable refrigerant charge amount calculated in advance from the rated cooling capacity (20C).
PCT/JP2019/003197 2018-02-23 2019-01-30 Low-capacity indoor unit Ceased WO2019163451A1 (en)

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CN111656102A (en) 2020-09-11

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