CN107957122B - Air conditioning system abnormity judgment method and device - Google Patents

Air conditioning system abnormity judgment method and device Download PDF

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CN107957122B
CN107957122B CN201711175762.5A CN201711175762A CN107957122B CN 107957122 B CN107957122 B CN 107957122B CN 201711175762 A CN201711175762 A CN 201711175762A CN 107957122 B CN107957122 B CN 107957122B
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air conditioner
state
temperature
air
judging
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CN107957122A (en
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陈东
黄春
刘合心
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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Abstract

The invention provides an abnormity judgment method and device for an air conditioning system, wherein the method comprises the following steps: setting at least one preset condition according to the corresponding relation between the top temperature Ta and the exhaust pipe temperature Tb of the compressor and the running state of the air conditioning system; and detecting Ta and Tb, and judging the air conditioning state according to the relation between Ta and Tb. The invention also provides an air conditioning system abnormity judgment device for realizing the method. The invention judges whether the air conditioner is in an abnormal state or not through the change of the top temperature of the air conditioner compressor and the temperature of the exhaust pipe of the compressor, thereby meeting the requirement of the air conditioning system on reliability use.

Description

Air conditioning system abnormity judgment method and device
Technical Field
The invention relates to the technical field of air conditioner control, in particular to an abnormality judgment method and device for an air conditioner system.
Background
With the development of the air conditioning industry, users put higher demands on the reliability of the air conditioning system. In the prior art, the reliability of the air conditioning system is mainly researched in the fluorine deficiency direction of the air conditioner, and the fluorine deficiency of the air conditioner can cause the overhigh temperature of the compressor. However, in the actual use process of the air conditioner, the blockage of the exhaust pipe valve can also cause the compressor to be burnt, the existing technology can not effectively monitor and control the problems, and great potential safety hazards exist.
Disclosure of Invention
In view of the above, the present invention is directed to a method and a device for determining an abnormality of an air conditioning system, so as to determine an operation state of an air conditioner and perform corresponding control, thereby satisfying a requirement for reliable use of the air conditioning system.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an abnormality judgment method for an air conditioning system includes the following steps:
setting at least one preset condition according to the corresponding relation between the top temperature Ta and the exhaust pipe temperature Tb of the compressor and the running state of the air conditioning system;
and detecting Ta and Tb, and judging the air conditioning state according to the relation between Ta and Tb.
Further, the preset conditions include:
the first preset condition is as follows: Ta-Tb is more than or equal to minus 10 ℃ and less than or equal to 10 ℃, and the corresponding air-conditioning system is in a normal operation state;
the second preset condition is as follows: Ta-Tb is more than or equal to 30-50 ℃, and Ta is more than or equal to 130-140 ℃, and the corresponding air-conditioning system is in a valve or system blockage state.
Further, the preset conditions further include:
the third preset condition is as follows: Ta-Tb is higher than 10-30 ℃ and lower than 30-50 ℃, and the corresponding air conditioning system is in an abnormal reminding state;
a fourth preset condition: ta is less than Tb, Tb-Ta is more than 10 ℃, and the corresponding air conditioning system is in a sensor falling state at the top of the compressor;
a fifth preset condition: Ta-Tb is more than or equal to 30-50 ℃, Ta is less than 130-140 ℃, and the corresponding air conditioning system is in a sensor falling state on a compressor exhaust pipe.
Further, the method for judging the abnormality of the air conditioning system further comprises the following steps:
setting a fluorine deficiency condition according to the relation between the indoor environment temperature Tc of the air conditioner and the evaporator coil temperature Td;
and detecting Tc and Td, and judging whether the air conditioner is lack of fluorine according to the relation between Tc and Td.
Further, the method for judging the abnormity of the air conditioning system further comprises the following steps:
executing corresponding protective measures according to the air conditioner state judgment result, wherein the protective measures comprise at least one of the following:
sending out a sensor falling prompt on a compressor exhaust pipe, wherein the sensor falling prompt corresponds to an air conditioner abnormal prompt state;
sending out a falling alarm of the top sensor of the compressor, wherein the falling alarm corresponds to the falling state of the top sensor of the air conditioner compressor;
sending out a sensor falling alarm on the exhaust pipe of the compressor, wherein the sensor falling alarm corresponds to the falling state of the sensor on the exhaust pipe of the air conditioner compressor;
executing shutdown operation corresponding to the blockage state of the air conditioner valve or the system;
and executing fluorine-lacking protection corresponding to the fluorine-lacking state of the air conditioner.
Further, the method for judging the abnormality of the air conditioning system further comprises the following steps:
and detecting the duration time of the air conditioning system in the same state, judging that the air conditioner is in the corresponding state when the duration time reaches the threshold time, and otherwise, not judging that the air conditioner is in the state.
Another objective of the present invention is to provide an apparatus for determining an abnormality of an air conditioning system, which is used to implement the method for determining an abnormality of an air conditioning system, and the apparatus includes:
the first temperature sensor is used for detecting the top temperature of the air-conditioning compressor;
the second temperature sensor is used for detecting the temperature of the exhaust pipe of the air-conditioning compressor;
the first judging unit is used for judging whether the relation between the top temperature of the air conditioner compressor and the temperature of the compressor exhaust pipe meets the preset condition or not;
the second judging unit is used for judging whether the air conditioner meets the fluorine lack condition;
the control unit is used for judging the air conditioner state according to the judgment results of the first judging unit and the second judging unit and executing corresponding control operation according to the judged air conditioner state;
the first determination unit is connected to the first temperature sensor and the second temperature sensor, and the control unit is connected to the first determination unit and the second determination unit.
Further, the abnormality determination device for an air conditioning system further includes:
the timing unit is used for recording the duration time of the air conditioner in a certain judgment state;
the third judging unit is used for judging whether the duration time of the air conditioner in a certain judging state reaches the threshold time or not;
the timing unit is connected with the third judging unit, the third judging unit and the timing unit are both connected with the control unit, and when the third judging unit judges that the duration of the air conditioner in a certain state reaches the threshold time, the control unit judges that the air conditioner enters the corresponding state.
Further, the abnormality determination device for an air conditioning system further includes:
the third temperature sensor is used for detecting the indoor environment temperature of the air conditioner;
the fourth temperature sensor is used for detecting the temperature of the coil of the air conditioner evaporator;
the second judging unit is connected with the third temperature sensor and the fourth temperature sensor and judges whether the air conditioner meets the fluorine deficiency condition or not according to the relation between the indoor environment temperature of the air conditioner and the temperature of the evaporator coil.
Further, the abnormality determination device for an air conditioning system further includes:
the reminding unit is used for sending out reminding or alarm information and is connected with the control unit;
compared with the prior art, the method and the device for judging the abnormity of the air conditioning system have the following advantages:
(1) the invention judges whether the air conditioner is in an abnormal state or not through the change of the top temperature of the air conditioner compressor and the temperature of the exhaust pipe of the compressor, thereby meeting the requirement of the air conditioning system on reliability use.
(2) Whether the system temperature sensor falls off or not, whether the system lacks fluorine or not, blocking of an exhaust valve and other various abnormalities can be judged according to various preset conditions, and the accuracy of abnormality judgment is improved.
(3) The invention also combines the fluorine lack judgment and adopts double judgment and logic control to realize the accurate judgment of the air conditioner state.
(3) And when the air conditioning system judges that the abnormality occurs, corresponding protection measures are taken to prevent the compressor from being burnt, so that the air conditioning system is safer and more reliable to operate.
(4) By setting the time threshold, the timeliness of abnormal judgment and protection can be ensured, and misjudgment can be effectively avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In the drawings:
fig. 1 is a block diagram showing the structure of an abnormality determination device of an air conditioning system according to embodiment 1 of the present invention;
FIG. 2 is a block diagram showing an abnormality determination device for an air conditioning system according to embodiment 2 of the present invention
Fig. 3 is a step chart of an abnormality determination method for an air conditioning system according to embodiment 3 of the present invention;
fig. 4 is a logic diagram of an abnormality determination method for an air conditioning system according to embodiment 4 of the present invention.
Description of reference numerals:
1-a first temperature sensor, 2-a second temperature sensor, 3-a first judging unit, 4-a second judging unit, 5-a control unit, 6-a third temperature sensor, 7-a fourth temperature sensor, 8-a timing unit, 9-a third judging unit and 10-a reminding unit.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
The air conditioning system abnormity judgment device is used for judging the running state of an air conditioner and carrying out corresponding control operation, so that the requirement for the reliability use of the air conditioning system is met.
As shown in fig. 1, the air conditioning system abnormality determination device of the present embodiment includes: a first temperature sensor 1, a second temperature sensor 2, a first determination unit 3, a second determination unit 4, and a control unit 5,.
The first temperature sensor 1 is arranged at the top of the air-conditioning compressor and used for detecting the top temperature of the air-conditioning compressor; and the second temperature sensor 2 is arranged on the exhaust pipe of the air-conditioning compressor and used for detecting the temperature of the exhaust pipe of the air-conditioning compressor.
The first determination unit 3 is connected to the first temperature sensor 1 and the second temperature sensor 2, and can receive detection information of the first temperature sensor 1 and the second temperature sensor 2. The first judging unit 3 is used for judging whether the relation between the top temperature of the air conditioner compressor and the temperature of the compressor exhaust pipe is the preset condition or not.
For example, Ta is set to indicate the compressor head temperature, Tb is set to indicate the compressor discharge pipe temperature, and the first determination unit 3 sets a preset condition: ta is less than Tb, and Tb-Ta is more than 10 ℃. The first determination unit 3 outputs a determination result when the relationship between the compressor top temperature Ta and the compressor discharge pipe temperature Tb satisfies the preset condition; when the relationship of Ta and Tb does not satisfy this preset condition, the first determination unit 3 continues to determine whether the relationship of Ta and Tb satisfies other preset conditions.
The second determining unit 4 is used for determining whether the air conditioner satisfies a fluorine deficiency condition, and is connected to a fluorine deficiency determining system of the air conditioner.
The control unit 5 is connected to the first determination unit 3 and the second determination unit 4, and is configured to combine the determination results of the first determination unit 3 and the second determination unit 4 to determine the air conditioning state. The judgment results of the first judgment unit 3 and the second judgment unit 4 have a plurality of combination modes, and the control unit 5 obtains corresponding air conditioner state judgment results according to different combination results.
The control unit 5 may also perform a corresponding control operation according to the determined air conditioning state. For example, when the control unit 5 determines that the air conditioner is fluorine-deficient, fluorine-deficient protection is executed; if the air conditioner valve or the system is blocked, the control unit 5 executes the shutdown operation to prevent the compressor from being burnt.
The air conditioning system abnormity judgment device can realize judgment of the air conditioning running state, and the principle is that the air conditioning running state is accurately judged by combining the judgment of lack of fluorine through the change of the top temperature of an air conditioning compressor and the temperature of an exhaust pipe of the compressor, so that the reliable use requirement of the air conditioning system is met.
Example 2
As shown in fig. 2, the abnormality determination device for an air conditioning system according to the present embodiment further includes, in addition to the above-described embodiment: a third temperature sensor 6, a fourth temperature sensor 7, a timing unit 8, a third determination unit 9 and a reminder unit 10.
The third temperature sensor 6 is arranged at the surface inlet of the evaporator of the indoor unit of the air conditioner and is used for detecting the indoor environment temperature of the air conditioner; the fourth temperature sensor 7 is installed on the air conditioner evaporator coil and used for detecting the temperature of the air conditioner evaporator coil.
The third temperature sensor 6 and the fourth temperature sensor 7 are connected to the second determination unit 4, and in this embodiment, the second determination unit 4 determines whether the air conditioner satisfies the fluorine deficiency condition according to the relationship between the indoor ambient temperature of the air conditioner and the temperature of the evaporator coil.
For example, Tc is set to represent the indoor environment temperature of the air conditioner, Td is set to represent the evaporator coil temperature, and the second determination unit 4 sets the fluorine deficiency condition as follows: the [ Tc-Td ] is less than or equal to 11 ℃. When the relation between the indoor environment temperature of the air conditioner and the temperature of the evaporator coil does not meet the fluorine deficiency condition, the second judgment unit 4 judges that the air conditioning system does not lack fluorine; when the relationship between Tc and Td satisfies the fluorine deficiency condition, the second determination unit 4 determines that the air conditioning system is fluorine deficient. Other necessary conditions for fluorine deficiency judgment can be set, and when the relation between Tc and Td meets the fluorine deficiency condition, the judgment of other conditions is carried out to confirm whether the air conditioner is fluorine deficiency, so that the accuracy of fluorine deficiency judgment can be enhanced.
The timing unit 8 is connected with the control unit 5 and is used for recording the duration time of the air conditioner in a certain judgment state. The air conditioner generally operates in a normal state, the first judging unit 3 and the second judging unit 4 perform judgment once every a period of time, when the control unit 5 judges that the state of the air conditioner is changed, the timing unit 8 starts to record initial time, the control unit 5 obtains the same judgment result for a plurality of times continuously, and the timing unit 8 records the maintaining time of the state. When the control unit 5 determines that the air-conditioning state is changed, the timer unit 8 counts the time again.
The third determination unit 9 is connected to the timing unit 8 and the control unit 5, and is configured to determine whether a duration of the air conditioner in a certain determination state reaches a threshold time. The timing unit 8 and the third judging unit 9 work cooperatively, and when the third judging unit 9 judges that the duration time of the air conditioner in a certain state reaches the threshold time, the control unit 5 judges that the air conditioner enters the corresponding state.
Different threshold time can be set for different air conditioner states, for example, the threshold time for judging the falling of the top temperature sensor of the compressor is 10min, and the threshold time for judging the blockage of an air conditioner valve or a system is 2 min. Through the setting of the time threshold, the timeliness of the abnormity judgment and protection of the air conditioning system abnormity judgment device can be ensured, and the misjudgment can be effectively avoided.
The reminding unit 10 is connected with the control unit 5 and is used for sending reminding information. When the air conditioning system is abnormal in sensor falling, the control unit 5 cannot directly execute the protection measures, and then the reminding unit 10 sends out corresponding reminding information to inform an abnormal judgment result.
Example 3
There is provided an air conditioning system abnormality determination method implemented by the air conditioning system abnormality determination device of the above embodiment. As shown in fig. 3, the method for determining an abnormality of an air conditioning system according to the present embodiment includes the steps of:
s110: and detecting the top temperature Ta of the compressor, the exhaust pipe temperature Tb of the compressor, the indoor environment temperature Tc of the air conditioner and the temperature Td of an evaporator coil when the air conditioner operates.
S120: and setting a plurality of preset conditions according to the corresponding relation between the relation of the Ta and the Tb and the running state of the air conditioning system, and sequentially judging whether the relation of the Ta and the Tb meets the preset conditions.
S130: and setting a fluorine deficiency condition according to the relation between Tc and Td, and judging whether the air conditioner meets the fluorine deficiency condition.
S140: and combining the judgment results of S120 and S130 to judge the air-conditioning state, and arranging and combining the judgment results of S120 and S130 to obtain the judgment result of the air-conditioning state.
S150: and executing corresponding protection measures according to the air conditioner state of the S140.
Wherein the preset conditions in S120 include:
the first preset condition is as follows: Ta-Tb is more than or equal to minus 10 ℃ and less than or equal to 10 ℃, and the corresponding air-conditioning system is in a normal operation state;
the second preset condition is as follows: Ta-Tb is more than or equal to 30-50 ℃, and Ta is more than or equal to 130-140 ℃, and the corresponding air-conditioning system is in a valve or system blockage state.
The third preset condition is as follows: Ta-Tb is higher than 10-30 ℃ and lower than 30-50 ℃, and the corresponding air conditioning system is in an abnormal reminding state;
a fourth preset condition: ta is less than Tb, Tb-Ta is more than 10 ℃, and the corresponding air conditioning system is in a sensor falling state at the top of the compressor;
a fifth preset condition: Ta-Tb is more than or equal to 30-50 ℃, Ta is less than 130-140 ℃, and the corresponding air conditioning system is in a sensor falling state on a compressor exhaust pipe.
The protective measures adopted by S150 include:
sending out a sensor falling prompt on a compressor exhaust pipe, wherein the sensor falling prompt corresponds to an air conditioner abnormal prompt state;
sending out a falling alarm of the top sensor of the compressor, wherein the falling alarm corresponds to the falling state of the top sensor of the air conditioner compressor;
sending out a sensor falling alarm on the exhaust pipe of the compressor, wherein the sensor falling alarm corresponds to the falling state of the sensor on the exhaust pipe of the air conditioner compressor;
executing shutdown operation corresponding to the blockage state of the air conditioner valve or the system;
and executing fluorine-lacking protection corresponding to the fluorine-lacking state of the air conditioner.
The embodiment judges whether the air conditioner is in an abnormal state or not by the change of the top temperature of the air conditioner compressor and the temperature of the exhaust pipe of the compressor, and judges the running state of the air conditioner accurately by combining the fluorine shortage judgment.
Example 4
In the present embodiment, on the basis of the above embodiment, the S140 further includes a time determination step, configured to set a time limit for determining the air conditioner state, and determine that the air conditioner is in the corresponding state only when the determination results of the S120 and the S130 are maintained unchanged and the duration reaches the threshold time. Different threshold time can be set according to different air conditioner states. Through the time judgment step, the timeliness of abnormity judgment and protection can be ensured, and misjudgment can be effectively avoided
As shown in fig. 4, which is a logic diagram of the method for determining the abnormality of the air conditioning system according to the embodiment of the present invention, during the operation of the air conditioner, the top temperature Ta of the air conditioner compressor, the exhaust pipe temperature Tb of the compressor, the indoor environment temperature Tc of the air conditioner and the evaporator coil temperature Td are detected, the relationship between Ta and Tb is determined first, then the relationship between Tc and Td is determined, and the determination results of the two are combined to obtain the state of the air conditioner. The logic judgment result is as follows:
if the relation between Ta and Tb meets a first preset condition and the relation between Tc and Td does not meet a fluorine lack condition, judging that the air conditioner is normal and maintaining operation;
if the relation between Ta and Tb meets a first preset condition and the relation between Tc and Td meets a fluorine-lacking condition, judging that the air conditioner is fluorine-lacking, and executing fluorine-lacking protection;
if the relation between Ta and Tb meets a second preset condition, judging that an air conditioner valve or a system is blocked, and executing shutdown operation;
if the relation between Ta and Tb meets a third preset condition, judging that the top temperature sensor of the air conditioner compressor falls off, and sending an air conditioner compressor top temperature sensor falling alarm;
if the relation between Ta and Tb meets a fourth preset condition and the relation between Tc and Td does not meet a fluorine lack condition, judging that the air conditioner is in an abnormal reminding state, and sending out a sensor falling reminding on an air conditioner compressor exhaust pipe;
if the relation between Ta and Tb meets a fourth preset condition and the relation between Tc and Td meets a fluorine-lacking condition, judging that the air conditioner is fluorine-lacking, and executing fluorine-lacking protection;
if the relation between Ta and Tb meets a fifth preset condition and the relation between Tc and Td does not meet a fluorine-lacking condition, judging that the temperature sensor on the exhaust pipe of the air conditioner compressor falls off, and sending a reminding of falling off of the temperature sensor on the exhaust pipe of the air conditioner compressor;
and if the relation between Ta and Tb meets a fifth preset condition and the relation between Tc and Td meets a fluorine-lacking condition, judging that the air conditioner is fluorine-lacking, and performing fluorine-lacking protection.
The embodiment adopts double judgment and logic control to realize the judgment of the air conditioner state, realizes the accurate judgment of the air conditioner state, can judge whether a system temperature sensor falls off or not according to various preset conditions, whether the system is lack of fluorine, valve blockage and other various abnormalities, and timely adopts corresponding protection means when the air conditioner system judges that the abnormality occurs, thereby meeting the use requirement of the reliability of the air conditioner system.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. An abnormality judgment method for an air conditioning system is characterized by comprising the following steps:
setting at least one preset condition according to the corresponding relation between the top temperature Ta and the exhaust pipe temperature Tb of the compressor and the running state of the air conditioning system;
detecting Ta and Tb, and judging the air-conditioning state according to the relation between Ta and Tb;
the preset conditions include:
the first preset condition is as follows: Ta-Tb is more than or equal to minus 10 ℃ and less than or equal to 10 ℃, and the corresponding air-conditioning system is in a normal operation state;
the second preset condition is as follows: Ta-Tb is more than or equal to 30-50 ℃, and Ta is more than or equal to 130-140 ℃, and the corresponding air-conditioning system is in a valve or system blockage state;
the third preset condition is as follows: Ta-Tb is higher than 10-30 ℃ and lower than 30-50 ℃, and the corresponding air conditioning system is in an abnormal reminding state;
a fourth preset condition: ta is less than Tb, Tb-Ta is more than 10 ℃, and the corresponding air conditioning system is in a sensor falling state at the top of the compressor;
a fifth preset condition: Ta-Tb is more than or equal to 30-50 ℃, Ta is less than 130-140 ℃, and the corresponding air conditioning system is in a sensor falling state on a compressor exhaust pipe.
2. The air conditioning system abnormality determining method according to claim 1, characterized by further comprising the steps of:
setting a fluorine deficiency condition according to the relation between the indoor environment temperature Tc of the air conditioner and the evaporator coil temperature Td;
and detecting Tc and Td, and judging whether the air conditioner is lack of fluorine according to the relation between Tc and Td.
3. The air conditioning system abnormality determining method according to claim 2, characterized by further comprising the steps of:
executing corresponding protective measures according to the air conditioner state judgment result, wherein the protective measures comprise at least one of the following:
sending out a sensor falling prompt on a compressor exhaust pipe, wherein the sensor falling prompt corresponds to an air conditioner abnormal prompt state;
sending out a falling alarm of the top sensor of the compressor, wherein the falling alarm corresponds to the falling state of the top sensor of the air conditioner compressor;
sending out a sensor falling alarm on the exhaust pipe of the compressor, wherein the sensor falling alarm corresponds to the falling state of the sensor on the exhaust pipe of the air conditioner compressor;
executing shutdown operation corresponding to the blockage state of the air conditioner valve or the system;
and executing fluorine-lacking protection corresponding to the fluorine-lacking state of the air conditioner.
4. The abnormality determination method for an air conditioning system according to claim 3, further comprising the steps of:
and detecting the duration time of the air conditioning system in the same state, judging that the air conditioner is in the corresponding state when the duration time reaches the threshold time, and otherwise, not judging that the air conditioner is in the state.
5. An air conditioning system abnormality determination device for realizing the air conditioning system abnormality determination method according to any one of claims 1 to 4, comprising:
the first temperature sensor is used for detecting the top temperature of the air-conditioning compressor;
the second temperature sensor is used for detecting the temperature of the exhaust pipe of the air-conditioning compressor;
the first judging unit is used for judging whether the relation between the top temperature of the air conditioner compressor and the temperature of the compressor exhaust pipe meets the preset condition or not;
the second judging unit is used for judging whether the air conditioner meets the fluorine lack condition;
the control unit is used for judging the air conditioner state according to the judgment results of the first judging unit and the second judging unit and executing corresponding control operation according to the judged air conditioner state;
the first determination unit is connected to the first temperature sensor and the second temperature sensor, and the control unit is connected to the first determination unit and the second determination unit.
6. The air conditioning system abnormality determining device according to claim 5, characterized by further comprising:
the timing unit is used for recording the duration time of the air conditioner in a certain judgment state;
the third judging unit is used for judging whether the duration time of the air conditioner in a certain judging state reaches the threshold time or not;
the timing unit is connected with the third judging unit, the third judging unit and the timing unit are both connected with the control unit, and when the third judging unit judges that the duration of the air conditioner in a certain state reaches the threshold time, the control unit judges that the air conditioner enters the corresponding state.
7. The air conditioning system abnormality determining device according to claim 6, characterized by further comprising:
the third temperature sensor is used for detecting the indoor environment temperature of the air conditioner;
the fourth temperature sensor is used for detecting the temperature of the coil of the air conditioner evaporator;
the second judging unit is connected with the third temperature sensor and the fourth temperature sensor and judges whether the air conditioner meets the fluorine deficiency condition or not according to the relation between the indoor environment temperature of the air conditioner and the temperature of the evaporator coil.
8. The air conditioning system abnormality determining device according to claim 7, characterized by further comprising:
and the reminding unit is used for sending reminding or alarm information and is connected with the control unit.
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