CN105546736A - Method for solving accumulated liquid of indoor heat exchanger of multi-split air conditioner during heating - Google Patents
Method for solving accumulated liquid of indoor heat exchanger of multi-split air conditioner during heating Download PDFInfo
- Publication number
- CN105546736A CN105546736A CN201510980607.5A CN201510980607A CN105546736A CN 105546736 A CN105546736 A CN 105546736A CN 201510980607 A CN201510980607 A CN 201510980607A CN 105546736 A CN105546736 A CN 105546736A
- Authority
- CN
- China
- Prior art keywords
- indoor set
- indoor
- expulsion
- pressure
- coil pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
-
- 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
-
- 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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a method for solving accumulated liquid of an indoor heat exchanger of a multi-split air conditioner during heating. The method is characterized by comprising the following steps: detecting all started indoor units one by one; judging whether the started indoor units simultaneously meet the following two conditions: 1, the difference between the temperature Te1 of an inlet of a coil pipe of each started indoor unit and the temperature Te2 of an outlet of the coil pipe of the started indoor unit is greater than or equal to 30 DEG C, and 2, the difference between the temperature Tem of the middle of the coil pipe of each started indoor unit and the temperature Te2 of the outlet of the coil pipe of the started indoor unit is greater than or equal to 10 DEG C; determining that liquid is accumulated in the started indoor units if the started indoor units simultaneously meet the two conditions; reducing the revolving speed of indoor fans (1) of the indoor units with accumulated liquid to be one-third of the maximum revolving speed of the indoor fans (1); and recovering the revolving speed of the indoor fans (1) of the indoor units to be normal revolving speed if exhaust pressure is further reduced to be 2.8 Mpa. The method is speedy and convenient.
Description
Technical field
The present invention relates to VRF Air Conditioning System, is specifically the method for a kind of solution indoor heat exchanger hydrops of multi-connected machine when heating.
Background technology
The VRF Air Conditioning System of prior art is called for short multi-connected machine, and it comprises off-premises station and multiple indoor set parallel with one another and the two refrigerant circulation house stewards being connected each indoor set and off-premises station.Off-premises station is communicated with the multiple indoor sets after parallel connection by two refrigerant circulation house stewards.
Off-premises station comprises compressor, oil eliminator, four-way change-over valve, outdoor heat exchanger while heating (during refrigeration be condenser be evaporimeter), outer organic electronic expansion valve, reservoir and gas-liquid separator.Compressor outlet is communicated with the entrance of oil eliminator, the outlet of oil eliminator is communicated with the first valve port of four-way change-over valve, four-way change-over valve second valve port is communicated with outdoor heat exchanger one end, the outdoor heat exchanger other end is communicated with one end of outer organic electronic expansion valve, the outer other end of organic electronic expansion valve is communicated with one end of reservoir, one that the other end and two refrigerants of reservoir circulate in house steward is communicated with, and another root refrigerant circulation house steward in two refrigerant circulation house stewards is communicated with four-way change-over valve the 3rd valve port of off-premises station, four-way change-over valve the 4th valve port is connected with the entrance of gas-liquid separator, the outlet of gas-liquid separator is communicated with suction port of compressor.
Each indoor set comprises interior organic electronic expansion valve and indoor heat exchanger while heating (during refrigeration be evaporimeter be condenser), one end of indoor heat exchanger is communicated with one end of interior organic electronic expansion valve, one that the other end and two refrigerants of interior organic electronic expansion valve circulate in house steward is communicated with, and the house steward that circulates is communicated with for the other end and two refrigerants another root refrigerant circulated in house steward of indoor heat exchanger.
During heating mode, the first valve port of four-way change-over valve is communicated with the 3rd valve port, and the second valve port is communicated with the 4th valve port, and refrigerant is along compressor, indoor heat exchanger, outdoor heat exchanger, the circulation of this route of compressor.
Because the factor such as model, exchange capability of heat, fan operation rotating speed, heating needs of multiple indoor sets of this unit parallel connection is all not identical, like this, in actual motion, often easily occur the situation of the hypervolia of refrigerant after the indoor set heat exchange of start, and this part unnecessary refrigerant deposit can be got up by the reservoir of prior art, but along with the fieriness day by day of air-conditioning market competition, producer to cost control to the degree of haggling over every penny, in order to reduce cost, a lot of producer directly eliminates reservoir, like this, when in system, liquid refrigerants is too much, for preventing liquid hammer compressor, the aperture of outer organic electronic expansion valve can only turn down, like this, this part liquid refrigerants will along the reverse accumulation of pipeline, finally slowly accumulate in the indoor heat exchanger of indoor set, namely there is indoor heat exchanger hydrops, once there is this situation, refrigerant flow rate can be caused slow, indoor set heating effect is deteriorated, even compressor outlet place report high voltage fault.Prior art lacks the method that can solve indoor heat exchanger hydrops quickly and easily.
Summary of the invention
The technical problem to be solved in the present invention is, provides a kind of method that can solve the indoor heat exchanger hydrops of multi-connected machine when heating quickly and easily.
Technical solution of the present invention is, a kind of method of the indoor heat exchanger hydrops of multi-connected machine when providing solution to heat, and its concrete steps are as follows:
Run under a, heating mode;
If indoor set is all started shooting, judge whether to meet following two conditions: the saturation temperature that 1, pressure at expulsion is corresponding is in the scope of 50 DEG C ~ 53 DEG C simultaneously; 2, the coil pipe middle portion temperature Tem of the indoor set of start is in the scope of 40 DEG C ~ 43 DEG C; As met simultaneously, then enter step b, if asynchronously met, then exit judgement;
If indoor set part is started shooting, judge whether to meet following three conditions: the saturation temperature that 1, pressure at expulsion is corresponding is in the scope of 50 DEG C ~ 53 DEG C simultaneously; 2, the coil pipe middle portion temperature Tem of the indoor set of start is in the scope of 40 DEG C ~ 43 DEG C; The coil pipe middle portion temperature Tem of the indoor set of 3, not starting shooting is in the scope of 45 DEG C ~ 48 DEG C; As met simultaneously, then enter step b, if asynchronously met, then exit judgement;
B, one by one the indoor set of each start to be detected, judge whether the indoor set that every platform start shooting meets following two conditions simultaneously: the Coil outlet temperature Te2 that the coil inlet temperature Te1 of the indoor set of 1, starting shooting deducts the indoor set of this start is more than or equal to 30 DEG C; 2, the Coil outlet temperature Te2 that the coil pipe middle portion temperature Tem of indoor set of start deducts the indoor set of this start is more than or equal to 10 DEG C; If meet above-mentioned condition simultaneously, then judge the inner hydrops of the indoor set of this start; If asynchronously met, then judge not hydrops;
C, the rotating speed of the indoor fan of the indoor set of hydrops is lowered to 1/3rd of this indoor fan maximum (top) speed, and the pressure at expulsion of Real-Time Monitoring compressor, when pressure at expulsion is more than or equal to 3.7Mpa, then open the relief valve of compressor, and continue monitoring pressure at expulsion, and if pressure at expulsion drops to 3Mpa, then the relief valve of close compressor, if pressure at expulsion drops to 2.8Mpa further, then the indoor fan of this indoor set is returned to rated speed.
The party's ratio juris is: first, the saturation temperature that the pressure at expulsion of compressor is corresponding, the coil pipe middle portion temperature of start is all normal, and the coil pipe middle portion temperature of the not starting shooting several years slightly higher than the coil pipe middle portion temperature of start, at least illustrate that compressor normally works, pipeline does not block substantially, refrigerant can normally arrive each indoor heat exchanger, if now hydrops in indoor heat exchanger, refrigerant flow rate in the coil pipe of then indoor heat exchanger is slow, and the blower fan of each indoor set is in normal work, therefore heat exchange amount is larger, when flowing in indoor heat exchanger, refrigerant temperature declines very fast, so, once find the temperature difference between the import of the coil pipe of indoor set and outlet and the excessive temperature differentials between middle part and outlet temperature, then judge the inner hydrops of this indoor set, once find that there is indoor set hydrops, just the rotation speed of fan of this hydrops indoor set is dropped to 1/3rd of maximum (top) speed, to reduce the heat exchange amount of this indoor set, reduce the liquefaction process of refrigerant, alleviate hydrops, but because gaseous coolant is many, Compressor Discharge Pressure can increase, when increasing to 3.7Mpa, then open relief valve pressure release, and continue to run blower fan according to 1/3rd rotating speeds, along with the situation of relief valve pressure release and refrigerant hydrops is constantly improved, pressure at expulsion also constantly reduces, then relief valve is closed when pressure at expulsion is reduced to 3Mpa, when pressure at expulsion is reduced to 2.8Mpa, hydrops situation and solution are then described, indoor fan is run with rated speed.
Adopt above method, the present invention solves the method for the indoor heat exchanger hydrops of multi-connected machine when heating compared with prior art, has the following advantages:
By the method, the inner hydrops problem of this indoor set can be solved efficiently and easily, ensure that the normal operation of air-conditioning, solve the technical barrier of objective reality always in industry.
Accompanying drawing explanation
Fig. 1 is the systematic schematic diagram that the present invention solves the method for the indoor heat exchanger hydrops of multi-connected machine when heating.
Shown in figure 1, indoor fan, 2, interior organic electronic expansion valve, 3, compressor, 4, indoor heat exchanger.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1, the present invention solves the method for the indoor heat exchanger hydrops of multi-connected machine when heating, and its concrete steps are as follows.
Run under a, heating mode.
First emphasize a concept, indoor set is started shooting, and refer to, the indoor fan 1 of indoor set is started shooting, and the interior organic electronic expansion valve 2 of indoor set is also opened, and indoor set shuts down, and refer to that the indoor fan 1 of indoor set shuts down, and interior organic electronic expansion valve 2 is still normally opened.
If indoor set is all started shooting, judge whether to meet following two conditions: the saturation temperature that 1, pressure at expulsion is corresponding is in the scope of 50 DEG C ~ 53 DEG C simultaneously; 2, the coil pipe middle portion temperature Tem of the indoor set of start is in the scope of 40 DEG C ~ 43 DEG C; As met simultaneously, then enter step b, if asynchronously met, then exit judgement, and judge not hydrops.At compressor 3 exhaust outlet, a pressure sensor is set to record pressure at expulsion, more just can obtains saturation temperature corresponding to this pressure by pressure at expulsion.
If indoor set part is started shooting, judge whether to meet following three conditions: the saturation temperature that 1, pressure at expulsion is corresponding is in the scope of 50 DEG C ~ 53 DEG C simultaneously; 2, the coil pipe middle portion temperature Tem of the indoor set of start is in the scope of 40 DEG C ~ 43 DEG C; The coil pipe middle portion temperature Tem of the indoor set of 3, not starting shooting is in the scope of 45 DEG C ~ 48 DEG C; As met simultaneously, then enter step b, if asynchronously met, then exit judgement, and judge not hydrops.
B, one by one the indoor set of each start to be detected, judge whether the indoor set that every platform start shooting meets following two conditions simultaneously: the Coil outlet temperature Te2 that the coil inlet temperature Te1 of the indoor set of 1, starting shooting deducts same indoor set of this start is more than or equal to 30 DEG C; 2, the Coil outlet temperature Te2 that the coil pipe middle portion temperature Tem of indoor set of start deducts same indoor set of this start is more than or equal to 10 DEG C; If meet above-mentioned condition simultaneously, then judge the inner hydrops of the indoor set of this start; If asynchronously met, then judge not hydrops.
In the entrance of the coil pipe of the indoor heat exchanger 4 of indoor set, middle part, outlet, three temperature sensors are set, to record coil inlet temperature Te1, coil pipe middle portion temperature Tem and Coil outlet temperature Te2 respectively.
C, the rotating speed of the indoor fan 1 of the indoor set of hydrops is lowered to 1/3rd of this indoor fan 1 maximum (top) speed, and utilize the pressure at expulsion of the pressure sensor Real-Time Monitoring compressor 3 of compressor 3 exhaust outlet, when pressure at expulsion is more than or equal to 3.7Mpa, then open the relief valve of compressor 3, and continue monitoring pressure at expulsion, if pressure at expulsion drops to 3Mpa, the then relief valve of close compressor 3, if pressure at expulsion drops to 2.8Mpa further, then the indoor fan 1 of the previous indoor set due to hydrops reduction rotation speed of fan is returned to rated speed.Rated speed is exactly the rotating speed that indoor fan 1 will meet that heating needs provides, and this rotating speed is greater than 1/3rd of maximum (top) speed.And relief valve is also the common components of off-premises station, is used for being communicated with the high-pressure side of compressor 3 and low-pressure side, avoids high voltage fault.
Claims (1)
1. a method for the indoor heat exchanger hydrops of multi-connected machine when solution heats, is characterized in that: its concrete steps are as follows:
Run under a, heating mode;
If indoor set is all started shooting, judge whether to meet following two conditions: 1), saturation temperature corresponding to pressure at expulsion be in the scope of 50 DEG C ~ 53 DEG C simultaneously; 2), the coil pipe middle portion temperature Tem of the indoor set of start is in the scope of 40 DEG C ~ 43 DEG C; As met simultaneously, then enter step b, if asynchronously met, then exit judgement;
If the start of indoor set part, judge whether to meet following three conditions: 1), saturation temperature corresponding to pressure at expulsion be in the scope of 50 DEG C ~ 53 DEG C simultaneously; 2), the coil pipe middle portion temperature Tem of the indoor set of start is in the scope of 40 DEG C ~ 43 DEG C; 3) the coil pipe middle portion temperature Tem of the indoor set of, not starting shooting is in the scope of 45 DEG C ~ 48 DEG C; As met simultaneously, then enter step b, if asynchronously met, then exit judgement;
B, one by one the indoor set of each start to be detected, judge whether the indoor set that every platform start shooting meets following two conditions simultaneously: 1), the coil inlet temperature Te1 of indoor set that the starts shooting Coil outlet temperature Te2 that deducts the indoor set of this start is more than or equal to 30 DEG C; 2) the Coil outlet temperature Te2 that, the coil pipe middle portion temperature Tem of indoor set of start deducts the indoor set of this start is more than or equal to 10 DEG C; If meet above-mentioned condition simultaneously, then judge the inner hydrops of the indoor set of this start; If asynchronously met, then judge not hydrops;
C, the rotating speed of the indoor fan (1) of the indoor set of hydrops is lowered to 1/3rd of this indoor fan (1) maximum (top) speed, and the pressure at expulsion of Real-Time Monitoring compressor (3), when pressure at expulsion is more than or equal to 3.7Mpa, then open the relief valve of compressor (3), and continue monitoring pressure at expulsion, if pressure at expulsion drops to 3Mpa, the then relief valve of close compressor (3), if pressure at expulsion drops to 2.8Mpa further, then the indoor fan (1) of this indoor set is returned to rated speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510980607.5A CN105546736B (en) | 2015-12-23 | 2015-12-23 | The method for solving the indoor heat exchanger hydrops of multi-connected machine during heating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510980607.5A CN105546736B (en) | 2015-12-23 | 2015-12-23 | The method for solving the indoor heat exchanger hydrops of multi-connected machine during heating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105546736A true CN105546736A (en) | 2016-05-04 |
| CN105546736B CN105546736B (en) | 2018-07-06 |
Family
ID=55826116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510980607.5A Active CN105546736B (en) | 2015-12-23 | 2015-12-23 | The method for solving the indoor heat exchanger hydrops of multi-connected machine during heating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105546736B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106545958A (en) * | 2016-10-11 | 2017-03-29 | 广东美的暖通设备有限公司 | The decision method that multiple on-line system and its indoor set refrigerating capacity are not enough |
| CN106765894A (en) * | 2016-11-29 | 2017-05-31 | 广东美的暖通设备有限公司 | Multiple on-line system and its coolant quantity decision method |
| CN111750481A (en) * | 2019-03-27 | 2020-10-09 | 日立江森自控空调有限公司 | Air conditioner control method and air conditioner system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08313125A (en) * | 1995-05-23 | 1996-11-29 | Sanyo Electric Co Ltd | Abnormally detecting method of pressure sensor and temperature sensor in refrigerating device |
| JP2004132610A (en) * | 2002-10-10 | 2004-04-30 | Mitsubishi Electric Corp | Heating system and dwelling house with heating system |
| CN102261719A (en) * | 2011-05-25 | 2011-11-30 | 宁波奥克斯电气有限公司 | Control method for starting heating mode of screw-type compressed multi-connected central air conditioner |
| CN102914027A (en) * | 2012-09-20 | 2013-02-06 | 宁波奥克斯电气有限公司 | Control method for preventing refrigerant of outdoor unit from bias flowing during refrigeration of multi-split air-conditioning unit |
| CN103075774A (en) * | 2013-01-09 | 2013-05-01 | 合肥天鹅制冷科技有限公司 | Combined air handling unit driven by total heat recovery type heat pump |
| CN103791587A (en) * | 2014-01-21 | 2014-05-14 | 宁波奥克斯电气有限公司 | Method for judging whether resistance values of temperature sensors of multi-union air conditioner of heating mode deviate |
-
2015
- 2015-12-23 CN CN201510980607.5A patent/CN105546736B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08313125A (en) * | 1995-05-23 | 1996-11-29 | Sanyo Electric Co Ltd | Abnormally detecting method of pressure sensor and temperature sensor in refrigerating device |
| JP2004132610A (en) * | 2002-10-10 | 2004-04-30 | Mitsubishi Electric Corp | Heating system and dwelling house with heating system |
| CN102261719A (en) * | 2011-05-25 | 2011-11-30 | 宁波奥克斯电气有限公司 | Control method for starting heating mode of screw-type compressed multi-connected central air conditioner |
| CN102914027A (en) * | 2012-09-20 | 2013-02-06 | 宁波奥克斯电气有限公司 | Control method for preventing refrigerant of outdoor unit from bias flowing during refrigeration of multi-split air-conditioning unit |
| CN103075774A (en) * | 2013-01-09 | 2013-05-01 | 合肥天鹅制冷科技有限公司 | Combined air handling unit driven by total heat recovery type heat pump |
| CN103791587A (en) * | 2014-01-21 | 2014-05-14 | 宁波奥克斯电气有限公司 | Method for judging whether resistance values of temperature sensors of multi-union air conditioner of heating mode deviate |
| CN103791587B (en) * | 2014-01-21 | 2016-08-24 | 宁波奥克斯电气股份有限公司 | Judge the method whether the heat detector resistance of the combined air conditioners of heating mode offsets |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106545958A (en) * | 2016-10-11 | 2017-03-29 | 广东美的暖通设备有限公司 | The decision method that multiple on-line system and its indoor set refrigerating capacity are not enough |
| CN106545958B (en) * | 2016-10-11 | 2019-07-26 | 广东美的暖通设备有限公司 | Multi-line system and its insufficient determination method of indoor unit refrigerating capacity |
| CN106765894A (en) * | 2016-11-29 | 2017-05-31 | 广东美的暖通设备有限公司 | Multiple on-line system and its coolant quantity decision method |
| CN106765894B (en) * | 2016-11-29 | 2019-07-26 | 广东美的暖通设备有限公司 | Multi-line system and its coolant quantity determination method |
| CN111750481A (en) * | 2019-03-27 | 2020-10-09 | 日立江森自控空调有限公司 | Air conditioner control method and air conditioner system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105546736B (en) | 2018-07-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104697106B (en) | Air-conditioning system compress control method | |
| CN108489150B (en) | Multi-split oil return control method and system | |
| EP3101369B1 (en) | Heat recovery variable-frequency multi-split heat pump system and control method thereof | |
| CN101571327B (en) | Control method of multi-connected heat pump air-conditioning unit parallelly connected by outdoor units | |
| CN104266318B (en) | The control method of VRF Air Conditioning System and system | |
| CN106801954B (en) | A kind of Gas-supplying enthalpy-increasing system and its control method, air conditioner | |
| CN102767886B (en) | Method for judging proper amount of refrigerants for multi-united air conditioning unit | |
| CN105066537A (en) | Heating and oil returning control method for multi-connected air conditioning unit | |
| CN104949210B (en) | The control method of air-conditioning system, air conditioner and air-conditioning system | |
| CN101893308A (en) | Method for controlling outdoor fan of air-conditioner | |
| CN105627612B (en) | The refrigeration control method of outdoor unit refrigerant pipe-line system, air conditioner and air conditioner | |
| CN105020950A (en) | Defrosting control method of multi-connected air conditioner unit | |
| CN103499162A (en) | Low-temperature air-cooled screw cold and hot water unit | |
| CN105526676B (en) | Judge heating when multi-connected machine indoor heat exchanger whether the method for hydrops | |
| CN107917505A (en) | A kind of multi-split air conditioner and its outdoor unit defrosting control method | |
| CN104764115B (en) | Multiple on-line system | |
| CN105546736A (en) | Method for solving accumulated liquid of indoor heat exchanger of multi-split air conditioner during heating | |
| CN104266417B (en) | Refrigeration operating method of multi-split air conditioner in high temperature environment | |
| CN102235722B (en) | Explosionproof control method for multi-connected air conditioning unit during refrigerant recovery | |
| CN107166582A (en) | Air conditioning cooling water system, air-conditioning system and air conditioning cooling water system control method | |
| CN104949375B (en) | Air-conditioning system and its refrigerant adjustment control method | |
| CN107014019A (en) | A kind of air-cooled single cooler group under low temperature environment | |
| CN114423995A (en) | Air conditioner and control method thereof | |
| CN104748432B (en) | multiple on-line system | |
| CN206113391U (en) | Cold chain heat recovery refrigerating system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |