CN105953483B - The abatement detecting method of multi-line system and its indoor unit restricting element - Google Patents
The abatement detecting method of multi-line system and its indoor unit restricting element Download PDFInfo
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- CN105953483B CN105953483B CN201610264531.0A CN201610264531A CN105953483B CN 105953483 B CN105953483 B CN 105953483B CN 201610264531 A CN201610264531 A CN 201610264531A CN 105953483 B CN105953483 B CN 105953483B
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- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
-
- 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
-
- 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
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- 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
- 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
- F25B2313/029—Control issues
- F25B2313/0293—Control issues related to the indoor fan, e.g. controlling speed
-
- 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
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of multi-line system and its abatement detecting methods of indoor unit restricting element, the described method comprises the following steps：In compressor start and after entering normal operation, if any one indoor unit standby mode in refrigeration mode in multiple indoor units, the restricting element and indoor fan controlled in the indoor unit is in closed state；Detect the inlet temperature of indoor heat exchanger and the outlet temperature of indoor heat exchanger in current indoor environment temperature, the indoor unit locating for the indoor unit；Determine whether the restricting element in the indoor unit is in failure state according to the inlet temperature and outlet temperature of indoor heat exchanger in current indoor environment temperature, the indoor unit locating for the indoor unit.This method can effectively detect whether indoor unit restricting element is in failure state, and whether the indoor unit so as to be found under standby mode in time the phenomenon that refrigerant flowing, comfort, stability and the safety of safeguards system occurs.
Description
Technical field
The present invention relates to air-conditioning technical field, in particular to the failure inspection of indoor unit restricting element in a kind of multi-line system
Survey method and a kind of multi-line system.
Background technique
Currently, multi-line system in the market uses electric expansion valve as the throttle part of indoor unit more.Compared to it
Its conventional physical throttle part, electric expansion valve control mode and control precision on, have unrivaled advantage, make its at
For the mainstream throttle part in multi-line system.
But either because of production technology problem or failure in a long time, electric expansion valve used at present all there is
Certain failure rate.And for the indoor unit of the multi-line system under the indoor unit of multi-line system, especially standby mode, when
When electric expansion valve is in failure state, there will be refrigerant to flow through in indoor unit, it can comfort, stability and safety to system
Bring major hidden danger, therefore, how effectively to detect electric expansion valve in indoor unit whether be in failure state become at present bite to
It solves the problems, such as.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is to propose a kind of abatement detecting method of indoor unit restricting element in multi-line system, and this method can be examined effectively
Measure whether indoor unit restricting element is in failure state, whether the indoor unit so as to be found under standby mode in time occurs
The phenomenon that refrigerant flows, comfort, stability and the safety of safeguards system.
It is another object of the present invention to propose a kind of multi-line system.
To achieve the above object, one aspect of the present invention embodiment proposes indoor unit restricting element in a kind of multi-line system
Abatement detecting method, the multi-line system includes outdoor unit and multiple indoor units, and the outdoor unit includes compressor, described
Each indoor unit in multiple indoor units includes indoor heat exchanger, restricting element and indoor fan, and the method includes following
Step：After the compressor start of the outdoor unit and entrance normal operation, if any one room in the multiple indoor unit
Interior machine standby mode in refrigeration mode, the then restricting element and indoor fan controlled in the indoor unit are in closed state；
Current indoor environment locating for the indoor unit is detected respectively to third temperature detector by the first of corresponding indoor unit setting
The inlet temperature of indoor heat exchanger and the outlet temperature of indoor heat exchanger in temperature, the indoor unit；And according to the indoor unit institute
The inlet temperature and outlet temperature of indoor heat exchanger determines in the indoor unit in the current indoor environment temperature at place, the indoor unit
Whether restricting element is in failure state.
The abatement detecting method of indoor unit restricting element in multi-line system according to an embodiment of the present invention, in outdoor unit
After compressor start and entrance run well, if any one indoor unit standby shape in refrigeration mode in multiple indoor units
State then controls restricting element and indoor fan in the indoor unit and is in closed state, and passes through corresponding indoor unit setting
First detect interior in current indoor environment temperature, the indoor unit locating for the indoor unit respectively to third temperature detector and change
The inlet temperature of hot device and the outlet temperature of indoor heat exchanger, and the current indoor environment temperature according to locating for the indoor unit,
The inlet temperature and outlet temperature of indoor heat exchanger determines whether the restricting element in the indoor unit is in failure in the indoor unit
It is cold to find whether the indoor unit under standby mode occurs to realize effective detection to indoor unit restricting element in time for state
The phenomenon that matchmaker is flowed, comfort, stability and the safety of safeguards system.
According to one embodiment of present invention, the current indoor environment temperature according to locating for the indoor unit, the interior
The inlet temperature and outlet temperature of indoor heat exchanger determines whether the restricting element in the indoor unit is in failure state in machine, packet
It includes：If the absolute value of the temperature gap between the inlet temperature and the outlet temperature be less than or equal to the first temperature threshold,
And the temperature gap between the current indoor environment temperature and the inlet temperature is more than or equal to second temperature threshold value and described
Temperature gap between current indoor environment temperature and the outlet temperature is more than or equal to the second temperature threshold value, then tentatively sentences
Restricting element in the fixed indoor unit is in failure state.
According to one embodiment of present invention, the restricting element in the preliminary judgement indoor unit be in failure state it
Afterwards, the restricting element also controlled in the indoor unit executes flyback action, and after the preset time that is delayed, judges the indoor unit again
The inlet temperature and outlet temperature of indoor heat exchanger in locating current indoor environment temperature, the indoor unit；If the entrance
The absolute value of temperature gap between temperature and the outlet temperature is less than or equal to first temperature threshold and described works as cup
Temperature gap between interior environment temperature and the inlet temperature is more than or equal to the second temperature threshold value and the current indoor
Temperature gap between environment temperature and the outlet temperature is more than or equal to the second temperature threshold value, then determines in the indoor unit
Restricting element be in failure state.
According to one embodiment of present invention, determine the indoor unit in restricting element whether be in failure state it
Before, also judge whether the first of corresponding indoor unit setting break down to third temperature detector.
According to one embodiment of present invention, described to judge the first of corresponding indoor unit setting to third temperature detector
Whether break down, including：After the indoor unit powers on and before the compressor of the outdoor unit is inactive, to locating for the indoor unit
Current indoor environment temperature, the inlet temperature and outlet temperature of indoor heat exchanger is judged in the indoor unit；If described
The absolute value of temperature gap between inlet temperature and the outlet temperature is less than or equal to third temperature threshold and described works as cup
The absolute value of temperature gap between interior environment temperature and the inlet temperature is less than or equal to the 4th temperature threshold and described current
The absolute value of temperature gap between indoor environment temperature and the outlet temperature is less than or equal to the 4th temperature threshold, then sentences
The first of disconnected corresponding indoor unit setting is not broken down to third temperature detector.
Further, in above-mentioned multi-line system indoor unit restricting element abatement detecting method, further include：If institute
The absolute value for stating the temperature gap between inlet temperature and the outlet temperature is less than or equal to the third temperature threshold and described
The absolute value of temperature gap between current indoor environment temperature and the inlet temperature is greater than the 4th temperature threshold and institute
The absolute value for stating the temperature gap between current indoor environment temperature and the outlet temperature is greater than the 4th temperature threshold, then
Judge that the first temperature detector of corresponding indoor unit setting breaks down；If the inlet temperature and the outlet temperature it
Between the absolute value of temperature gap be greater than the third temperature threshold and the current indoor environment temperature and the inlet temperature
Between temperature gap absolute value be less than or equal to the 4th temperature threshold and the current indoor environment temperature and it is described go out
The absolute value of temperature gap between mouth temperature is greater than the 4th temperature threshold, then judges the third for corresponding to indoor unit setting
Temperature detector breaks down；If the absolute value of the temperature gap between the inlet temperature and the outlet temperature is greater than institute
The absolute value for stating the temperature gap between third temperature threshold and the current indoor environment temperature and the inlet temperature is greater than
The absolute value of 4th temperature threshold and the temperature gap between the current indoor environment temperature and the outlet temperature is small
In being equal to the 4th temperature threshold, then judge that the second temperature detector for corresponding to indoor unit setting breaks down.
To achieve the above object, another aspect of the present invention embodiment proposes a kind of multi-line system, including：Outdoor unit,
The outdoor unit includes compressor；Multiple indoor units, each indoor unit in the multiple indoor unit include indoor heat exchanger,
Restricting element and indoor fan；The first of corresponding each indoor unit setting is to third temperature detector, and described first to third temperature
Degree detector is respectively used to detect indoor heat exchanger in current indoor environment temperature, each indoor unit locating for each indoor unit
The outlet temperature of inlet temperature and indoor heat exchanger；And control module, the control module respectively with corresponding each indoor unit
First be arranged to third temperature detector is connected, wherein after the compressor start of the outdoor unit and entrance normal operation,
If any one indoor unit standby mode in refrigeration mode in the multiple indoor unit, control module if, controls the room
Restricting element and indoor fan in interior machine are in closed state, and the current indoor environment temperature according to locating for the indoor unit
The inlet temperature and outlet temperature of indoor heat exchanger determines whether the restricting element in the indoor unit is in mistake in degree, the indoor unit
Effect state.
Multi-line system according to an embodiment of the present invention, after the compressor start of outdoor unit and entrance normal operation, such as
Any one indoor unit standby mode in refrigeration mode, control module then control the section in the indoor unit in the multiple indoor units of fruit
Fluid element and indoor fan are in closed state, and the current indoor environment temperature according to locating for the indoor unit of detection, should
The inlet temperature and outlet temperature of indoor heat exchanger determines whether the restricting element in the indoor unit is in failure shape in indoor unit
State finds whether the indoor unit under standby mode refrigerant occurs in time to realize effective detection to indoor unit restricting element
The phenomenon that flowing, comfort, stability and the safety of safeguards system.
According to one embodiment of present invention, the control module is in the current indoor environment temperature according to locating for the indoor unit
The inlet temperature and outlet temperature of indoor heat exchanger determines whether the restricting element in the indoor unit is in mistake in degree, the indoor unit
When effect state, wherein if the absolute value of the temperature gap between the inlet temperature and the outlet temperature is less than or equal to the
Temperature gap between one temperature threshold and the current indoor environment temperature and the inlet temperature is more than or equal to second temperature
Temperature gap between threshold value and the current indoor environment temperature and the outlet temperature is more than or equal to the second temperature threshold
Value, restricting element of the control module then in the preliminary judgement indoor unit are in failure state.
According to one embodiment of present invention, restricting element of the control module in the preliminary judgement indoor unit is in
After failure state, the restricting element also controlled in the indoor unit executes flyback action, and after the preset time that is delayed, sentences again
The inlet temperature and outlet temperature of indoor heat exchanger in current indoor environment temperature, the indoor unit locating for the indoor unit of breaking, and
The absolute value of temperature gap between the inlet temperature and the outlet temperature be less than or equal to first temperature threshold and
Temperature gap between the current indoor environment temperature and the inlet temperature is more than or equal to the second temperature threshold value and institute
It is described when stating the temperature gap between current indoor environment temperature and the outlet temperature more than or equal to the second temperature threshold value
Control module determines that the restricting element in the indoor unit is in failure state.
According to one embodiment of present invention, the control module is determining whether the restricting element in the indoor unit is in
Before failure state, also judge whether the first of corresponding indoor unit setting break down to third temperature detector.
According to one embodiment of present invention, the control module is judging the first of corresponding indoor unit setting to third
When whether temperature detector breaks down, wherein after the indoor unit powers on and before the compressor of the outdoor unit is inactive, institute
Control module is stated to the inlet temperature of indoor heat exchanger in current indoor environment temperature, the indoor unit locating for the indoor unit and is gone out
Mouth temperature is judged；If the absolute value of the temperature gap between the inlet temperature and the outlet temperature is less than or equal to the
The absolute value of temperature gap between three temperature thresholds and the current indoor environment temperature and the inlet temperature is less than or equal to
The absolute value of temperature gap between 4th temperature threshold and the current indoor environment temperature and the outlet temperature be less than etc.
In the 4th temperature threshold, the control module then judges that correspond to indoor unit setting first is equal to third temperature detector
It does not break down.
Further, if the absolute value of the temperature gap between the inlet temperature and the outlet temperature is less than or equal to
The absolute value of temperature gap between the third temperature threshold and the current indoor environment temperature and the inlet temperature is big
In the 4th temperature threshold and the absolute value of the temperature gap between the current indoor environment temperature and the outlet temperature
Greater than the 4th temperature threshold, the control module then judges that event occurs for the first temperature detector for corresponding to indoor unit setting
Barrier；If the absolute value of the temperature gap between the inlet temperature and the outlet temperature be greater than the third temperature threshold,
And the absolute value of the temperature gap between the current indoor environment temperature and the inlet temperature is less than or equal to the 4th temperature
The absolute value for spending threshold value and the temperature gap between the current indoor environment temperature and the outlet temperature is greater than the described 4th
Temperature threshold, the control module then judge that the third temperature detector for corresponding to indoor unit setting breaks down；If described
The absolute value of temperature gap between inlet temperature and the outlet temperature is greater than the third temperature threshold and described works as cup
The absolute value of temperature gap between interior environment temperature and the inlet temperature is greater than the 4th temperature threshold and described current
The absolute value of temperature gap between indoor environment temperature and the outlet temperature is less than or equal to the 4th temperature threshold, described
Control module then judges that the second temperature detector for corresponding to indoor unit setting breaks down.
Detailed description of the invention
Fig. 1 is the process of the abatement detecting method of indoor unit restricting element in multi-line system according to an embodiment of the present invention
Figure.
Fig. 2 is the block diagram of multi-line system according to an embodiment of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Indoor unit restricting element in the multi-line system proposed according to embodiments of the present invention described with reference to the accompanying drawings
Abatement detecting method and multi-line system.
Fig. 1 is the process of the abatement detecting method of indoor unit restricting element in multi-line system according to an embodiment of the present invention
Figure.
In an embodiment of the present invention, multi-line system may include outdoor unit and multiple indoor units, and outdoor unit includes pressure
Contracting machine, each indoor unit in multiple indoor units includes indoor heat exchanger, restricting element and indoor fan.Wherein, throttling member
Part can be electric expansion valve.
As shown in Figure 1, the abatement detecting method of indoor unit restricting element includes the following steps in the multi-line system：
S1, after the compressor start of outdoor unit and entrance normal operation, if any one in multiple indoor units is indoor
Machine standby mode in refrigeration mode, the then restricting element and indoor fan controlled in the indoor unit are in closed state.
Specifically, after the compressor start of outdoor unit and entrance normal operation, if any one in multiple indoor units
A indoor unit standby mode in refrigeration mode, then the restricting element in the indoor unit will be in close state, indoor heat exchanger
Middle no refrigerant flows through, and starts to judge whether the restricting element in the indoor unit is in failure state at this time.Meanwhile in order to exclude room
The interference of inner blower also controls indoor fan in the indoor unit and is in close state.
It should be noted that in an embodiment of the present invention, if multi-line system is non-recovery type heat multi-line system,
When then and indoor unit in refrigeration mode in the outdoor unit of multi-line system is in standby, indicate that the indoor unit is in refrigeration
Mode standby mode；If multi-line system is recovery type heat multi-line system, indoors machine standby shape in refrigeration mode
When state, indoor unit standby mode in refrigeration mode is indicated.
S2 is detected respectively to third temperature detector by the first of corresponding indoor unit setting and is worked as locating for the indoor unit
The inlet temperature of indoor heat exchanger and the outlet temperature of indoor heat exchanger in preceding indoor environment temperature, the indoor unit.
Specifically, can be detected by the first temperature detector being arranged on machine indoors current locating for the indoor unit
Indoor environment temperature T1, and the second temperature detector by the way that the inlet of indoor heat exchanger in machine indoors is arranged detects the room
The inlet temperature T2A of indoor heat exchanger in interior machine, and the third by the way that the exit of indoor heat exchanger in machine indoors is arranged
Temperature detector detects the outlet temperature T2B of indoor heat exchanger in the indoor unit.Wherein, first to third temperature detector can be with
For temperature sensing package, temperature sensor etc..
S3, according to the inlet temperature of indoor heat exchanger in current indoor environment temperature, the indoor unit locating for the indoor unit
Determine whether the restricting element in the indoor unit is in failure state with outlet temperature.
According to one embodiment of present invention, current indoor environment temperature T1, the indoor unit according to locating for the indoor unit
The inlet temperature T2A and outlet temperature T2B of middle indoor heat exchanger determine whether the restricting element in the indoor unit is in failure shape
State, including：If the absolute value of the temperature gap between inlet temperature T2A and outlet temperature T2B is less than or equal to the first temperature threshold
Temperature gap between value δ 1 and current indoor environment temperature T1 and inlet temperature T2A be more than or equal to second temperature threshold value δ 2 and
Temperature gap between current indoor environment temperature T1 and outlet temperature T2B is more than or equal to second temperature threshold value δ 2, then tentatively sentences
Restricting element in the fixed indoor unit is in failure state.Wherein, the first temperature threshold δ 1 and second temperature threshold value δ 2 can roots
It is demarcated according to actual conditions.
Specifically, when indoor unit standby mode in refrigeration mode, the restricting element in the indoor unit will be in closing
State flows through in indoor heat exchanger without refrigerant at this time, it is contemplated that first to the installation site of third temperature detector and itself
Deviation has T2A ≈ T2B ≈ T1 at this time.And when restricting element is in failure state, such as restricting element is not in and completely closes
State, when a large amount of refrigerant passes through from indoor heat exchanger, since indoor fan is in close state, indoor heat exchanger, which lacks, to be changed
Heat has T2A ≈ T2B < T1 at this time, that is, has | T2A-T2B |≤δ 1 and T1-T2A >=δ 2 and T1-T2B >=δ 2.Therefore, by this
The inlet temperature T2A and outlet temperature T2B of indoor heat exchanger in current indoor environment temperature T1, the indoor unit locating for indoor unit
It can effectively judge whether the restricting element in the indoor unit is in failure state, find the indoor unit under standby mode in time
Whether there is the phenomenon that " stealing refrigerant ", prevent a large amount of refrigerants caused by failing because of restricting element from flowing through indoor heat exchanger, to being
Comfort, stability and the safety of system cause significant impact, thus ensured the comfort of system, stability and safety,
And there is role of correcting to " step-out " phenomenon of individual restricting elements.
According to one embodiment of present invention, the restricting element in the preliminary judgement indoor unit be in failure state it
Afterwards, the restricting element also controlled in the indoor unit executes flyback action, and after the preset time that is delayed, judges the indoor unit again
The inlet temperature T2A and outlet temperature T2B of indoor heat exchanger in locating current indoor environment temperature T1, the indoor unit；If
The absolute value of temperature gap between inlet temperature T2A and outlet temperature T2B is less than or equal to the first temperature threshold δ 1 and works as cup
Temperature gap between interior environment temperature T1 and inlet temperature TA2 is more than or equal to second temperature threshold value δ 2 and current indoor environment
Temperature gap between temperature T1 and outlet temperature T2B is more than or equal to second temperature threshold value δ 2, then determines the section in the indoor unit
Fluid element is in failure state.Wherein, preset time can be demarcated according to the actual situation.
That is, the restricting element in the preliminary judgement indoor unit is in failure in order to improve the accuracy of judgement
After state, the restricting element also controlled in the indoor unit executes flyback action, and after N minutes, determines again | T2A-T2B |
≤ δ 1 and T1-T2A >=δ 2 and whether T1-T2B >=δ 2 is true.If set up, determine that restricting element is in mistake in the indoor unit
Effect state.
According to one embodiment of present invention, determine the indoor unit in restricting element whether be in failure state it
Before, also judge whether the first of corresponding indoor unit setting break down to third temperature detector.
According to one embodiment of present invention, it is judging the first of corresponding indoor unit setting to third temperature detector
It is not no when breaking down, including：After the indoor unit powers on and before the compressor of outdoor unit is inactive, work as to locating for the indoor unit
The inlet temperature T2A and outlet temperature T2B of indoor heat exchanger are judged in preceding indoor environment temperature T1, the indoor unit；If
The absolute value of temperature gap between inlet temperature T2A and outlet temperature T2B is less than or equal to third temperature threshold δ 3 and works as cup
The absolute value of temperature gap between interior environment temperature T1 and inlet temperature T2A is less than or equal to the 4th temperature threshold δ 4 and current
The absolute value of temperature gap between indoor environment temperature T1 and outlet temperature T2B is less than or equal to the 4th temperature threshold δ 4, then sentences
The first of disconnected corresponding indoor unit setting is not broken down to third temperature detector.
Further, if the absolute value of the temperature gap between inlet temperature T2A and outlet temperature T2B is less than or equal to the
The absolute value of three temperature threshold δ 3 and the temperature gap between current indoor environment temperature T1 and inlet temperature T2A is greater than the 4th
The absolute value of temperature gap between temperature threshold δ 4 and current indoor environment temperature T1 and outlet temperature T2B is greater than the 4th temperature
Threshold value δ 4 is spent, then judges that the first temperature detector for corresponding to indoor unit setting breaks down；If inlet temperature T2A and outlet
The absolute value of temperature gap between temperature T2B is greater than third temperature threshold δ 3 and current indoor environment temperature T1 and entrance temperature
The absolute value of the temperature gap between T2A is spent less than or equal to the 4th temperature threshold δ 4 and current indoor environment temperature T1 and outlet
The absolute value of temperature gap between temperature T2B is greater than the 4th temperature threshold δ 4, then judges the third for corresponding to indoor unit setting
Temperature detector breaks down；If the absolute value of the temperature gap between inlet temperature T2A and outlet temperature T2B is greater than third
The absolute value of temperature gap between temperature threshold δ 3 and current indoor environment temperature T1 and inlet temperature T2A is greater than the 4th temperature
The absolute value for spending threshold value δ 4 and the temperature gap between current indoor environment temperature T1 and outlet temperature T2B is less than or equal to the 4th
Temperature threshold δ 4 then judges that the second temperature detector for corresponding to indoor unit setting breaks down.
Specifically, in order to exclude first to interference caused by third temperature detector, machine is powered on and outdoor unit indoors
Before compressor is inactive, first judge the first of indoor unit to third temperature detector.If △ t1=| T2A-T2B |, △
T2=| T1-T2A |, △ t3=| T1-T2B |, when first to third temperature detector is in normal condition, there is △ t1 ≈ △ t2
≈ △ t3 ≈ 0, and when first to third temperature detector breaks down, above-mentioned equation is invalid.
For example, can be judged using differential technique first to third temperature detector, i.e., as △ t1≤δ 3 and △ t2
≤ δ 4 and when △ t3≤δ 4 judges that first does not break down to third temperature detector；As △ t1≤δ 3 and △ t2 > δ 4 and △
When t3 > δ 4, judge that the first temperature detector breaks down；As △ t1 > δ 3 and △ t2≤δ 4 and △ t3 > δ 4, third is judged
Temperature detector breaks down；As △ t1 > δ 3 and △ t2 > δ 4 and △ t3≤δ 4, judge that event occurs for second temperature detector
Barrier.Wherein, when judge first to third temperature detector fault-free when, then using the above method to restricting element in the indoor unit
Judged, to improve the accuracy of judgement.
The abatement detecting method of indoor unit restricting element in multi-line system according to an embodiment of the present invention, in outdoor unit
After compressor start and entrance run well, if any one indoor unit standby shape in refrigeration mode in multiple indoor units
State then controls restricting element and indoor fan in the indoor unit and is in closed state, and passes through corresponding indoor unit setting
First detect interior in current indoor environment temperature, the indoor unit locating for the indoor unit respectively to third temperature detector and change
The inlet temperature of hot device and the outlet temperature of indoor heat exchanger, and the current indoor environment temperature according to locating for the indoor unit,
The inlet temperature and outlet temperature of indoor heat exchanger determines whether the restricting element in the indoor unit is in failure in the indoor unit
State finds whether the indoor unit under standby mode occurs " steathily in time to realize effective detection to indoor unit restricting element
Walk refrigerant " the phenomenon that, comfort, stability and the safety of safeguards system, and hardware cost not will increase by this method,
And there is role of correcting to " step-out " phenomenon of individual restricting elements.
Fig. 2 is the block diagram of multi-line system according to an embodiment of the invention.As shown in Fig. 2, the multi-connected machine
System includes：Outdoor unit 10, multiple indoor units 20 (one is only shown in figure), corresponding each indoor unit 20 be arranged first to the
Three temperature detectors (the first temperature detector 31, second temperature detector 32 and third temperature detector 33) and control module
(not specifically illustrated in figure).
Wherein, outdoor unit 10 includes compressor 11, and each indoor unit 20 in multiple indoor units 20 includes indoor heat exchange
Device 21, restricting element 22 and indoor fan 23.First is respectively used to detect locating for each indoor unit 20 to third temperature detector
Current indoor environment temperature T1, the inlet temperature T2A of indoor heat exchanger 21 and indoor heat exchanger 21 in each indoor unit 20
Outlet temperature T2B.Control module is connected to third temperature detector with the first of corresponding each setting of indoor unit 20 respectively,
In, after the compressor 11 of outdoor unit 10 starts and enters normal operation, if any one indoor unit in multiple indoor units 20
20 standby modes in refrigeration mode, control module then controls restricting element 22 in the indoor unit 20 and indoor fan 23 is located
In closed state, and indoor heat exchanger 21 in current indoor environment temperature T1, the indoor unit 20 according to locating for the indoor unit 20
Inlet temperature T2A and outlet temperature T2B determine the restricting element 22 in the indoor unit 20 whether in failure state.
According to one embodiment of present invention, control module is in the current indoor environment temperature according to locating for the indoor unit 20
The inlet temperature T2A and outlet temperature T2B of indoor heat exchanger 21 determine the member of the throttling in the indoor unit 20 in T1, the indoor unit 20
When whether part 22 is in failure state, wherein if temperature gap between inlet temperature T2A and outlet temperature T2B is absolute
Value is less than or equal to the first temperature threshold δ 1 and the temperature gap between current indoor environment temperature T1 and inlet temperature T2A is greater than
Equal to second temperature threshold value δ 2 and the temperature gap between current indoor environment temperature T1 and outlet temperature T2B is more than or equal to the
Two temperature threshold δ 2, restricting element 22 of the control module then in the preliminary judgement indoor unit 20 are in failure state.
Specifically, when 20 standby mode in refrigeration mode of indoor unit, the restricting element 22 in the indoor unit 20 will be located
It in closed state, is flowed through in indoor heat exchanger 21 without refrigerant at this time, it is contemplated that first to third temperature detector installation site
And itself deviation, there is T2A ≈ T2B ≈ T1 at this time.And when restricting element 22 is in failure state, such as restricting element 22 is not
It is in the completely closed state, when a large amount of refrigerant passes through from indoor heat exchanger 21, since indoor fan 23 is in close state, room
Interior heat exchanger 21 lacks heat exchange, has T2A ≈ T2B < T1 at this time, that is, has | T2A-T2B |≤δ 1 and T1-T2A >=δ 2 and T1-T2B
≥δ2.Therefore, pass through the inlet temperature of indoor heat exchanger in current indoor environment temperature T1, the indoor unit locating for the indoor unit
T2A and outlet temperature T2B can effectively judge whether the restricting element in the indoor unit is in failure state, in time discovery to
Whether the indoor unit under machine state there is the phenomenon that " stealing refrigerant ", prevents a large amount of refrigerants caused by failing because of restricting element from flowing through
Indoor heat exchanger causes significant impact to the comfort of system, stability and safety, thus ensured the comfort of system,
Stability and safety, and have role of correcting to " step-out " phenomenon of individual restricting elements.
According to one embodiment of present invention, restricting element 22 of the control module in the preliminary judgement indoor unit 20 is in
After failure state, the restricting element 22 also controlled in the indoor unit 20 executes flyback action, and after the preset time that is delayed, then
It is secondary judge current indoor environment temperature T1 locating for the indoor unit 20, in the indoor unit 20 indoor heat exchanger 21 inlet temperature
T2A and outlet temperature T2B, and the absolute value of the temperature gap between inlet temperature T2A and outlet temperature T2B is less than or equal to the
One temperature threshold δ 1 and temperature gap between current indoor environment temperature T1 and inlet temperature T2A is more than or equal to second temperature
Temperature gap between threshold value δ 2 and current indoor environment temperature T1 and outlet temperature T2B is more than or equal to second temperature threshold value δ 2
When, control module determines that the restricting element 22 in the indoor unit 20 is in failure state.
That is, the restricting element 22 in the preliminary judgement indoor unit 20 is in order to improve the accuracy of judgement
After failure state, control module also controls the restricting element 22 in the indoor unit 20 and executes flyback action, and after N minutes,
Again determine | T2A-T2B |≤δ 1 and T1-T2A >=δ 2 and whether T1-T2B >=δ 2 is true.If set up, the indoor unit is determined
Restricting element 22 is in failure state in 20.
According to one embodiment of present invention, control module is determining whether the restricting element 22 in the indoor unit 20 is in
Before failure state, also judge whether the first of the corresponding indoor unit 20 setting break down to third temperature detector.
According to one embodiment of present invention, control module is judging the first of the corresponding indoor unit 20 setting to third temperature
When whether degree detector breaks down, wherein after the indoor unit 20 powers on and before the compressor 11 of outdoor unit 10 is inactive, control
Inlet temperature of the molding block to indoor heat exchanger 21 in current indoor environment temperature T1, the indoor unit 20 locating for the indoor unit 20
T2A and outlet temperature T2B are judged；If the absolute value of the temperature gap between inlet temperature T2A and outlet temperature T2B is small
In the absolute value for being equal to third temperature threshold δ 3 and the temperature gap between current indoor environment temperature T1 and inlet temperature T2A
Less than or equal to the 4th temperature threshold δ 4 and the temperature gap between current indoor environment temperature T1 and outlet temperature T2B it is absolute
Value is less than or equal to the 4th temperature threshold δ 4, and control module then judges to correspond to the first of the indoor unit 20 setting to third temperature detection
Device does not break down.
Further, if the absolute value of the temperature gap between inlet temperature T2A and outlet temperature T2B is less than or equal to the
The absolute value of three temperature threshold δ 3 and the temperature gap between current indoor environment temperature T1 and inlet temperature T2A is greater than the 4th
The absolute value of temperature gap between temperature threshold δ 4 and current indoor environment temperature T1 and outlet temperature T2B is greater than the 4th temperature
Threshold value δ 4 is spent, control module then judges that the first temperature detector 31 for corresponding to the indoor unit 20 setting breaks down；If entrance
The absolute value of temperature gap between temperature T2A and outlet temperature T2B is greater than third temperature threshold δ 3 and current indoor environment temperature
The absolute value for spending the temperature gap between T1 and inlet temperature T2A is less than or equal to the 4th temperature threshold δ 4 and current indoor environment
The absolute value of temperature gap between temperature T1 and outlet temperature T2B is greater than the 4th temperature threshold δ 4, and control module then judges pair
Should indoor unit 20 be arranged third temperature detector 33 break down；If between inlet temperature T2A and outlet temperature T2B
The absolute value of temperature gap is greater than third temperature threshold δ 3 and the temperature between current indoor environment temperature T1 and inlet temperature T2A
The absolute value for spending difference is greater than the 4th temperature threshold δ 4 and the temperature between current indoor environment temperature T1 and outlet temperature T2B
The absolute value of difference is less than or equal to the 4th temperature threshold δ 4, and control module then judges to correspond to the second temperature of the indoor unit 20 setting
Detector 32 breaks down.
Specifically, in order to exclude first to interference caused by third temperature detector, machine 20 is powered on and outdoor unit indoors
Before 10 compressor 11 is inactive, first judge the first of indoor unit 20 to third temperature detector.If △ t1=| T2A-
T2B |, △ t2=| T1-T2A |, △ t3=| T1-T2B |, when first to third temperature detector is in normal condition, there is △
T1 ≈ △ t2 ≈ △ t3 ≈ 0, and when first to third temperature detector breaks down, above-mentioned equation is invalid.
For example, can be judged using differential technique first to third temperature detector, i.e., as △ t1≤δ 3 and △ t2
≤ δ 4 and when △ t3≤δ 4, control module judge that first does not break down to third temperature detector；As △ t1≤δ 3 and △ t2
> δ 4 and when △ t3 > δ 4, control module judges that the first temperature detector 31 breaks down；As △ t1 > δ 3 and △ t2≤δ 4 and
When △ t3 > δ 4, control module judges that third temperature detector 33 breaks down；As △ t1 > δ 3 and △ t2 > δ 4 and △ t3≤δ
When 4, control module judges that second temperature detector 32 breaks down.Wherein, when judge first to third temperature detector without reason
When barrier, control module uses the above method to judge restricting element in the indoor unit again, improves the accuracy of judgement.
Multi-line system according to an embodiment of the present invention, after the compressor start of outdoor unit and entrance normal operation, such as
Any one indoor unit standby mode in refrigeration mode, control module then control the section in the indoor unit in the multiple indoor units of fruit
Fluid element and indoor fan are in closed state, and the current indoor environment temperature according to locating for the indoor unit of detection, should
The inlet temperature and outlet temperature of indoor heat exchanger determines whether the restricting element in the indoor unit is in failure shape in indoor unit
State finds whether the indoor unit under standby mode occurs " stealing in time to realize effective detection to indoor unit restricting element
The phenomenon that refrigerant ", comfort, stability and the safety of safeguards system, and hardware cost not will increase by this method, and
There is role of correcting to " step-out " phenomenon of individual restricting elements.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include at least one of the features.In the description of the present invention, " multiple "
It is meant that at least two, such as two, three etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. the abatement detecting method of indoor unit restricting element in a kind of multi-line system, which is characterized in that the multi-line system
Including outdoor unit and multiple indoor units, the outdoor unit includes compressor, and each indoor unit in the multiple indoor unit wraps
Indoor heat exchanger, restricting element and indoor fan are included, the described method comprises the following steps：
After the compressor start of the outdoor unit and entrance normal operation, if any one in the multiple indoor unit is indoor
Machine standby mode in refrigeration mode, the then restricting element and indoor fan controlled in the indoor unit are in closed state；
Current indoor locating for the indoor unit is detected respectively to third temperature detector by the first of corresponding indoor unit setting
The inlet temperature of indoor heat exchanger and the outlet temperature of indoor heat exchanger in environment temperature, the indoor unit；And
According to the inlet temperature of indoor heat exchanger in current indoor environment temperature, the indoor unit locating for the indoor unit and outlet temperature
Degree determines whether the restricting element in the indoor unit is in failure state, the current indoor environment according to locating for the indoor unit
The inlet temperature and outlet temperature of indoor heat exchanger determines whether the restricting element in the indoor unit is in temperature, the indoor unit
Failure state, including：
If the absolute value of the temperature gap between the inlet temperature and the outlet temperature be less than or equal to the first temperature threshold,
And the temperature gap between the current indoor environment temperature and the inlet temperature is more than or equal to second temperature threshold value and described
Temperature gap between current indoor environment temperature and the outlet temperature is more than or equal to the second temperature threshold value, then tentatively sentences
Restricting element in the fixed indoor unit is in failure state.
2. the abatement detecting method of indoor unit restricting element in multi-line system according to claim 1, which is characterized in that
After the restricting element in the preliminary judgement indoor unit is in failure state,
The restricting element also controlled in the indoor unit executes flyback action, and after the preset time that is delayed, judges the interior again
The inlet temperature and outlet temperature of indoor heat exchanger in current indoor environment temperature, the indoor unit locating for machine；
If the absolute value of the temperature gap between the inlet temperature and the outlet temperature is less than or equal to first temperature
Temperature gap between threshold value and the current indoor environment temperature and the inlet temperature is more than or equal to the second temperature threshold
It is worth and the temperature gap between the current indoor environment temperature and the outlet temperature is more than or equal to the second temperature threshold
Value, then determine that the restricting element in the indoor unit is in failure state.
3. according to claim 1 in multi-line system described in any one of -2 indoor unit restricting element abatement detecting method,
It is characterized in that, also judging the corresponding indoor unit before determining whether the restricting element in the indoor unit is in failure state
Whether first be arranged to third temperature detector breaks down.
4. the abatement detecting method of indoor unit restricting element in multi-line system according to claim 3, which is characterized in that
It is described to judge whether the first of corresponding indoor unit setting break down to third temperature detector, including：
After the indoor unit powers on and before the compressor of the outdoor unit is inactive, to current indoor environment locating for the indoor unit
The inlet temperature and outlet temperature of indoor heat exchanger is judged in temperature, the indoor unit；
If the absolute value of the temperature gap between the inlet temperature and the outlet temperature be less than or equal to third temperature threshold,
And the absolute value of the temperature gap between the current indoor environment temperature and the inlet temperature is less than or equal to the 4th temperature threshold
The absolute value of value and the temperature gap between the current indoor environment temperature and the outlet temperature is less than or equal to the described 4th
Temperature threshold then judges that correspond to the first of indoor unit setting does not break down to third temperature detector.
5. the abatement detecting method of indoor unit restricting element in multi-line system according to claim 4, which is characterized in that
Further include：
If the absolute value of the temperature gap between the inlet temperature and the outlet temperature is less than or equal to the third temperature
The absolute value of temperature gap between threshold value and the current indoor environment temperature and the inlet temperature is greater than the 4th temperature
The absolute value for spending threshold value and the temperature gap between the current indoor environment temperature and the outlet temperature is greater than the described 4th
Temperature threshold then judges that the first temperature detector for corresponding to indoor unit setting breaks down；
If the absolute value of the temperature gap between the inlet temperature and the outlet temperature be greater than the third temperature threshold,
And the absolute value of the temperature gap between the current indoor environment temperature and the inlet temperature is less than or equal to the 4th temperature
The absolute value for spending threshold value and the temperature gap between the current indoor environment temperature and the outlet temperature is greater than the described 4th
Temperature threshold then judges that the third temperature detector for corresponding to indoor unit setting breaks down；
If the absolute value of the temperature gap between the inlet temperature and the outlet temperature be greater than the third temperature threshold,
And the absolute value of the temperature gap between the current indoor environment temperature and the inlet temperature is greater than the 4th temperature threshold
The absolute value of value and the temperature gap between the current indoor environment temperature and the outlet temperature is less than or equal to the described 4th
Temperature threshold then judges that the second temperature detector for corresponding to indoor unit setting breaks down.
6. a kind of multi-line system, which is characterized in that including：
Outdoor unit, the outdoor unit include compressor；
Multiple indoor units, each indoor unit in the multiple indoor unit include indoor heat exchanger, restricting element and indoor wind
Machine；
The first of corresponding each indoor unit setting to third temperature detector, described first to third temperature detector is respectively used to
The inlet temperature of indoor heat exchanger and interior in current indoor environment temperature, each indoor unit locating for each indoor unit is detected to change
The outlet temperature of hot device；And
Control module, the control module is connected to third temperature detector with the first of corresponding each indoor unit setting respectively,
Wherein, in the compressor start of the outdoor unit and after entering normal operation, if any one room in the multiple indoor unit
Interior machine standby mode in refrigeration mode, the control module then controls restricting element in the indoor unit and indoor fan is located
In closed state, and in current indoor environment temperature, the indoor unit according to locating for the indoor unit indoor heat exchanger entrance temperature
Degree and outlet temperature determine whether the restricting element in the indoor unit is in failure state, and the control module is according to the interior
The inlet temperature and outlet temperature of indoor heat exchanger determines the indoor unit in current indoor environment temperature, the indoor unit locating for machine
In restricting element when whether being in failure state, wherein
If the absolute value of the temperature gap between the inlet temperature and the outlet temperature be less than or equal to the first temperature threshold,
And the temperature gap between the current indoor environment temperature and the inlet temperature is more than or equal to second temperature threshold value and described
Temperature gap between current indoor environment temperature and the outlet temperature is more than or equal to the second temperature threshold value, the control
Restricting element of the module then in the preliminary judgement indoor unit is in failure state.
7. multi-line system according to claim 6, which is characterized in that the control module is in the preliminary judgement indoor unit
In restricting element be in after failure state, also control restricting element in the indoor unit and execute flyback action, and be delayed
After preset time, the entrance of indoor heat exchanger in current indoor environment temperature, the indoor unit locating for the indoor unit is judged again
Temperature and outlet temperature, and the absolute value of the temperature gap between the inlet temperature and the outlet temperature is less than or equal to institute
The temperature gap between the first temperature threshold and the current indoor environment temperature and the inlet temperature is stated more than or equal to described
Temperature gap between second temperature threshold value and the current indoor environment temperature and the outlet temperature is more than or equal to described the
When two temperature thresholds, the control module determines that the restricting element in the indoor unit is in failure state.
8. the multi-line system according to any one of claim 6-7, which is characterized in that the control module is determining to be somebody's turn to do
Whether the restricting element in indoor unit is in front of failure state, also the first of the corresponding indoor unit setting of judgement to third temperature
Whether detector breaks down.
9. multi-line system according to claim 8, which is characterized in that the control module is judging the corresponding indoor unit
When whether first be arranged to third temperature detector breaks down, wherein
After the indoor unit powers on and before the compressor of the outdoor unit is inactive, the control module is to locating for the indoor unit
The inlet temperature and outlet temperature of indoor heat exchanger is judged in current indoor environment temperature, the indoor unit；
If the absolute value of the temperature gap between the inlet temperature and the outlet temperature be less than or equal to third temperature threshold,
And the absolute value of the temperature gap between the current indoor environment temperature and the inlet temperature is less than or equal to the 4th temperature threshold
The absolute value of value and the temperature gap between the current indoor environment temperature and the outlet temperature is less than or equal to the described 4th
Temperature threshold, the control module then judge that corresponding to the first of indoor unit setting does not occur event to third temperature detector
Barrier.
10. multi-line system according to claim 9, which is characterized in that
If the absolute value of the temperature gap between the inlet temperature and the outlet temperature is less than or equal to the third temperature
The absolute value of temperature gap between threshold value and the current indoor environment temperature and the inlet temperature is greater than the 4th temperature
The absolute value for spending threshold value and the temperature gap between the current indoor environment temperature and the outlet temperature is greater than the described 4th
Temperature threshold, the control module then judge that the first temperature detector for corresponding to indoor unit setting breaks down；
If the absolute value of the temperature gap between the inlet temperature and the outlet temperature be greater than the third temperature threshold,
And the absolute value of the temperature gap between the current indoor environment temperature and the inlet temperature is less than or equal to the 4th temperature
The absolute value for spending threshold value and the temperature gap between the current indoor environment temperature and the outlet temperature is greater than the described 4th
Temperature threshold, the control module then judge that the third temperature detector for corresponding to indoor unit setting breaks down；
If the absolute value of the temperature gap between the inlet temperature and the outlet temperature be greater than the third temperature threshold,
And the absolute value of the temperature gap between the current indoor environment temperature and the inlet temperature is greater than the 4th temperature threshold
The absolute value of value and the temperature gap between the current indoor environment temperature and the outlet temperature is less than or equal to the described 4th
Temperature threshold, the control module then judge that the second temperature detector for corresponding to indoor unit setting breaks down.
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