CN103017295A - Refrigeration-to-heating mode starting method of multi-split air conditioner - Google Patents
Refrigeration-to-heating mode starting method of multi-split air conditioner Download PDFInfo
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- CN103017295A CN103017295A CN2012105276269A CN201210527626A CN103017295A CN 103017295 A CN103017295 A CN 103017295A CN 2012105276269 A CN2012105276269 A CN 2012105276269A CN 201210527626 A CN201210527626 A CN 201210527626A CN 103017295 A CN103017295 A CN 103017295A
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Abstract
The invention discloses a refrigeration-to-heating mode starting method of a multi-split air conditioner. Coordinate control is performed according to different time intervals during which each part in an air-conditioning system runs at different times. Action time sequence of each part is sequentially and reasonably coordinated according to respective start time and start time interval of each part in the multi-split air conditioning system, so that a four-way valve is enabled to be successfully switched, the multi-split air conditioning system can be controlled in a normal and reliable running way, the disorder of running of the whole multi-split air conditioning system is avoided, a direct-current inverter compressor is enabled to normally run, and the service life of the direct-current inverter compressor is prolonged.
Description
Technical field
The present invention relates to the air conditioner controlling technology field, specifically is a kind of refrigeration transformation of ownership heat pattern starting method of multi-gang air-conditioner of Multi-compressor parallel.
Background technology
Direct-current variable will be gone through refrigeration mode, heating mode and the mutually operation of conversion in the running of the whole year.When multi-gang air-conditioner when heating mode moves, direct-current variable is in intelligent defrosting and oil return controlling run process, operational mode need to change into refrigeration mode by heating mode, and after the operation of finishing intelligent defrosting and oil return control, operational mode changes into heating mode from refrigeration mode again.The process of this conversion from refrigeration mode to heating mode, the conversion of operational mode is to finish by the commutation of cross valve, and the commutation of cross valve is to need pressure reduction to reach certain condition just can finish.
The control procedure of the cross valve of prior art is such: when heating, determine time A according to environment temperature, close simultaneously the unloading magnetic valve, then start the anti-cold wind operation of the blower motor of indoor set, then start frequency-changeable compressor, after frequency-changeable compressor has moved 180 seconds and has added time A, the pilot valve of cross valve energising action, cross valve is realized the commutation action, and the blower motor of off-premises station brings into operation simultaneously; Shut down when heating, at first close the blower motor of frequency-changeable compressor and off-premises station, then open the unloading magnetic valve, make the pilot valve power-off restoration of controlling again cross valve behind the connected state duration B of blast pipe and air intake duct, close simultaneously the blower motor of indoor set, at this moment, time B is 5 seconds～15 seconds; When again heating, at first close the unloading magnetic valve, control simultaneously the pilot valve energising action of cross valve, then start frequency-changeable compressor, after frequency-changeable compressor moved 180 seconds, the blower motor of indoor set started anti-cold pneumatic work.
But the shortcoming of above-mentioned this control method is:
1) A determines according to outdoor environment temperature the time, and this just needs great many of experiments to determine rational outdoor environment temperature and time A, if the outdoor environment temperature sensor fault just can't be judged and definite time A;
2) time A and time B are the numerical value of determining by the test under the limited working condition in the laboratory, and direct-current variable is that variation is various in the actual use of engineering field working conditions condition, very large with the experimental condition difference in the laboratory, therefore, the time A that determines in the laboratory and time B can not guarantee that cross valve can both successfully commutate under full working condition.
3) in addition; in the direct-current variable-frequency multi-connection machine system of Multi-compressor parallel; except DC frequency-changeable compressor; the parts that also have other; such as electric expansion valve; cross valve; the indoor fan motor; outdoor fan motor and various magnetic valves etc.; when the operational mode of direct-current variable-frequency multi-connection machine turns to heating mode by refrigeration mode; if coordinate the action relationships between bad these control parts; it is the sequential relationship of control action; will cause the operation of whole direct-current variable-frequency multi-connection machine system disorderly; thereby affect the reliability of system, even cause frequent shutdown, compressor is burnt in more serious meeting.
Summary of the invention
Technical problem to be solved by this invention is; a kind of refrigeration transformation of ownership heat pattern starting method of multi-gang air-conditioner is provided; it can coordinate the action sequence of respectively controlling in the direct-current variable-frequency multi-connection machine system between the parts; make cross valve realize more reliably commutation function; the reliability of assurance system is avoided disorderly closedown, is avoided burning compressor.
For solving the problems of the technologies described above, the refrigeration transformation of ownership heat pattern starting method of multi-gang air-conditioner provided by the invention, this multi-gang air-conditioner comprises two DC frequency-changeable compressors that are connected in parallel, its starting method may further comprise the steps:
1) after direct-current variable was finished defrost process or oil return process, operational mode need to turn to heating mode from refrigeration mode, and at this moment, the electric-control system of off-premises station sends enabled instruction;
2) energising started after the gas bypass solenoid valve was received enabled instruction, and after unlatching continued 60 seconds～80 seconds afterwards, the gas bypass solenoid valve was closed;
3) receive enabled instruction after, the first oil return solenoid valve energising is opened, and the lubricating oil of the first gs-oil separator bottom is transmitted back in the muffler of the first DC frequency-changeable compressor, after continuing 30 seconds～40 seconds, the first oil return solenoid valve is closed;
4) receive enabled instruction after, after delaying time 20 seconds～30 seconds before this, the first DC frequency-changeable compressor begins again to start, enter first paragraph oil return running status, this moment, the running frequency of the first DC frequency-changeable compressor was 20 hertz～40 hertz, after first paragraph oil return running status is moved 60 seconds～80 seconds, the first DC frequency-changeable compressor enters second segment oil return running status, this moment, the running frequency of the first DC frequency-changeable compressor was 50 hertz～70 hertz, when the second DC frequency-changeable compressor finishes its oil return running status, together withdraw from start-up course;
5) receive enabled instruction after, again energising startup after the second oil return solenoid valve was delayed time first 10 seconds～15 seconds, the lubricating oil of the second gs-oil separator bottom is transmitted back in the muffler of the second DC frequency-changeable compressor, continues after 30 seconds～40 seconds, the second oil return solenoid valve is closed;
6) after the second DC frequency-changeable compressor is received enabled instruction, began again to start after after the first DC frequency-changeable compressor starts, delaying time before this 10 seconds～15 seconds, enter first paragraph oil return running status, this moment, the running frequency of the second DC frequency-changeable compressor was 20 hertz～40 hertz, after this frequency is moved 60 seconds～80 seconds, the second DC frequency-changeable compressor enters second segment oil return running status, this moment, the running frequency of the second DC frequency-changeable compressor was 50 hertz～70 hertz, after 100 seconds～120 seconds, withdraw from start-up course in this frequency operation;
7) the outdoor fan motor was delayed time first 30 seconds～50 seconds after the second DC frequency-changeable compressor starts, and changed the rotating speed auto-adjustment control over to again;
8) cross valve is delayed time first to switch in 30 seconds～50 seconds after the second DC frequency-changeable compressor starts again and is begun the commutation action; The pressure differential of the system low-voltage force value that the system high pressure force value that detects when the high-pressure sensor and low-pressure sensor detect is higher than 6bar, if perhaps the temperature difference of the temperature value that detects of the temperature value that detects of total suction temperature sensor and outdoor environment temperature sensor is lower than 6 ℃, the temperature difference of the temperature value that the temperature value that perhaps temperature sensor detects in the middle part of the outdoor heat exchange coil pipe and outdoor environment temperature sensor detect is lower than 0 ℃, simultaneously the delivery temperature that detects of the delivery temperature that detects of the first DC frequency-changeable compressor exhaust gas temperature sensor and the second DC frequency-changeable compressor exhaust gas temperature sensor all is higher than 30 ℃ and when continuing 3 seconds, can confirm that cross valve commutates successfully;
9) after receiving enabled instruction, heat electric expansion valve and be in closed condition, after delaying time first 40 seconds～60 seconds after the first DC frequency-changeable compressor starts, the aperture of valve reaches～300 steps of 200 steps, keeps this aperture until start-up course finishes;
10) the hydrojet magnetic valve is in the outage closed condition all the time;
11) in start-up course, receive start-up command indoor set electric expansion valve aperture by closed condition open to 120 the step～300 the step; Do not receive start-up command indoor set electric expansion valve aperture by closed condition open to 40 the step～60 the step;
12) in start-up course, the blower motor that receives the indoor set of start-up command is in anti-cold wind control, it is stopped status, until the temperature value that indoor heat exchanger coil pipe middle part temperature sensor detects is when being higher than 25 ℃, the blower motor of indoor set just begins to start, and carries out automatic rotational speed regulation control according to the temperature at indoor heat exchanger coil pipe middle part; The blower motor that does not receive the indoor set of start-up command is in stopped status all the time.
After adopting above method, the present invention compared with prior art, have the following advantages: owing to need not to determine according to environment temperature the connected state duration B of time A and blast pipe and air intake duct, as long as each parts in the multi-online air-conditioning system are according to separately start-up time and starting duration, in an orderly manner, reasonably coordinate the action sequence between each parts, the normal reliable operation ground mode that is conducive to multi-online air-conditioning system is controlled, guaranteed the successful commutation of cross valve, therefore, avoid occurring the disorderly phenomenon of whole multi-online air-conditioning system operation, guarantee the normal operation of DC frequency-changeable compressor, and prolong its service life.
Description of drawings
Fig. 1 is the systematic schematic diagram of multi-gang air-conditioner among the present invention;
Fig. 2 is the sequential schematic diagram of the refrigeration transformation of ownership heat pattern starting method of multi-gang air-conditioner of the present invention.。
Wherein: 1, the first DC frequency-changeable compressor; 2, the first gs-oil separator; 3, the first check valve; 4, the first oil return solenoid valve; 5, the second DC frequency-changeable compressor; 6, the second gs-oil separator; 7, the second check valve; 8, the second oil return solenoid valve; 9, the 3rd check valve; 10, gas bypass solenoid valve; 11, cross valve; 12, outdoor heat exchanger; 13, outdoor fan motor; 14, the 4th check valve; 15, heat electric expansion valve; 16, high-pressure reservoir; 17, hydrojet magnetic valve; 18, cutoff; 19, indoor electronic expansion valve; 20, indoor electronic expansion valve; 21, indoor heat exchanger; 22, return-air stop valve; 23, gas-liquid separator; 24, low-pressure sensor; 25, the first DC frequency-changeable compressor exhaust gas temperature sensor; 26, the second DC frequency-changeable compressor exhaust gas temperature sensor; 27, high-pressure sensor; 28, indoor heat exchanger inlet temperature sensor; 29, indoor heat exchanger coil pipe middle part temperature sensor; 30, indoor heat exchanger outlet temperature sensor; 31, outdoor heat exchanger coil pipe middle part temperature sensor; 32, defrosting control temperature sensor; 33, outdoor environment temperature sensor; 34, total suction temperature sensor.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in more detail.
By the systematic schematic diagram of multi-gang air-conditioner among the present invention shown in Figure 1 as can be known, this is the direct-current variable-frequency multi-connection machine that is formed in parallel by two DC frequency-changeable compressors, this multi-connected machine device is the multi-connected machine of prior art, generally includes following these parts: 1, the first DC frequency-changeable compressor; 2, the first gs-oil separator; 3, the first check valve; 4, the first oil return solenoid valve; 5, the second DC frequency-changeable compressor; 6, the second gs-oil separator; 7, the second check valve; 8, the second oil return solenoid valve; 9, the 3rd check valve; 10, gas bypass solenoid valve; 11, cross valve; 12, outdoor heat exchanger; 13, outdoor fan motor; 14, the 4th check valve; 15, heat electric expansion valve; 16, high-pressure reservoir; 17, hydrojet magnetic valve; 18, cutoff; 19, indoor electronic expansion valve; 20, indoor electronic expansion valve; 21, indoor heat exchanger; 22, return-air stop valve; 23, gas-liquid separator; 24, low-pressure sensor; 25, the first DC frequency-changeable compressor exhaust gas temperature sensor; 26, the second DC frequency-changeable compressor exhaust gas temperature sensor; 27, high-pressure sensor; 28, indoor heat exchanger inlet temperature sensor; 29, indoor heat exchanger coil pipe middle part temperature sensor; 30, indoor heat exchanger outlet temperature sensor; 31, outdoor heat exchanger coil pipe middle part temperature sensor; 32, defrosting control temperature sensor; 33, outdoor environment temperature sensor; 34, total suction temperature sensor.By as can be known shown in Figure 1, this is a kind of systematic schematic diagram of routine, just is not described in detail the annexation between each parts here.
In the said apparatus, described the first gs-oil separator 2 with the lubricating oil separation in 1 exhaust of the first DC frequency-changeable compressor out is stored in lubricating oil the bottom of the first gs-oil separator 2.Equally, described the second gs-oil separator 6 with the lubricating oil separation in 5 exhausts of the second DC frequency-changeable compressor out is stored in lubricating oil the bottom of the second gs-oil separator 6.
Described low-pressure sensor 24 is for detection of the low pressure of refrigeration system, and the rotating speed of control outdoor fan motor 13 during the heating mode operation, and be used for refrigeration system is carried out low-voltage variation prevents that refrigeration system from crossing infringement compressor when low in low pressure.Described high-pressure sensor 27 is for detection of the high-pressure of refrigeration system; control the running frequency of the first DC frequency-changeable compressor 1 and the second DC frequency-changeable compressor 5 during the heating mode operation; and be used for refrigeration system is carried out high voltage protective, prevent that refrigeration system from damaging compressor when high pressure is too high.
Described indoor heat exchanger inlet temperature sensor 28 and indoor heat exchanger coil pipe middle part temperature sensor 29, be used for respectively detecting the inlet temperature of indoor heat exchanger and the temperature at coil pipe middle part, and come the valve opening of electric expansion valve 19 in the conditioning chamber according to the difference of inlet temperature and coil pipe middle part temperature.
The coil pipe middle part temperature that described indoor heat exchanger coil pipe middle part temperature sensor 29 detects is used for the rotating speed of control room inner blower motor.
The outdoor heat exchanger coil pipe middle part temperature that described outdoor heat exchanger coil pipe middle part temperature sensor 31 is used for detecting, the valve opening that heats electric expansion valve 15 is controlled and regulated to total suction temperature that described total suction temperature sensor 34 detects by the difference of outdoor heat exchanger coil pipe middle part temperature and total suction temperature.
Refrigeration transformation of ownership heat pattern starting method below in conjunction with 2 pairs of above-mentioned multi-gang air-conditioners of accompanying drawing is described in detail.
Specific embodiment one: only have the separate unit indoor set to receive start-up command
1) after direct-current variable was finished defrost process or oil return process, operational mode need to turn to heating mode from refrigeration mode, and at this moment, the electric-control system of off-premises station sends enabled instruction;
2) energising started after gas bypass solenoid valve 10 was received enabled instruction, and after unlatching continued 60 seconds afterwards, gas bypass solenoid valve 10 was closed;
3) receive enabled instruction after, the energising of the first oil return solenoid valve 4 is opened, and the lubricating oil of the first gs-oil separator 2 bottoms is transmitted back in the muffler of the first DC frequency-changeable compressor 1, after continuing 30 seconds, the first oil return solenoid valve 4 is closed;
4) receive enabled instruction after, after delaying time 20 seconds before this, the first DC frequency-changeable compressor 1 begins again to start, enter first paragraph oil return running status, this moment, the running frequency of the first DC frequency-changeable compressor 1 was 30 hertz, after first paragraph oil return running status is moved 60 seconds, the first DC frequency-changeable compressor 1 enters second segment oil return running status, this moment, the running frequency of the first DC frequency-changeable compressor 1 was 60 hertz, when the second DC frequency-changeable compressor 5 finishes its oil return running status, together withdraw from start-up course;
5) receive enabled instruction after, after the second oil return solenoid valve 8 was delayed time first 10 seconds again energising start, the lubricating oil of the second gs-oil separator 6 bottoms is transmitted back in the muffler of the second DC frequency-changeable compressor 5, continue after 30 seconds, the second oil return solenoid valve 8 is closed;
6) after the second DC frequency-changeable compressor 5 is received enabled instruction, began again to start after after the first DC frequency-changeable compressor 1 starts, delaying time before this 10 seconds, enter first paragraph oil return running status, this moment, the running frequency of the second DC frequency-changeable compressor 5 was 30 hertz, after 60 seconds, the second DC frequency-changeable compressor 5 enters second segment oil return running status in this frequency operation, and this moment, the running frequency of the second DC frequency-changeable compressor 5 was 60 hertz, after 100 seconds, withdraw from start-up course in this frequency operation;
7) outdoor fan motor 18 was delayed time first 30 seconds after the second DC frequency-changeable compressor 5 starts, and changed the rotating speed auto-adjustment control over to again;
8) cross valve 11 is delayed time first to switch in 30 seconds after the second DC frequency-changeable compressor 5 starts again and is begun the commutation action; The pressure differential of the system low-voltage force value that the system high pressure force value that detects when high-pressure sensor 27 and low-pressure sensor 24 detect is higher than 6bar, if perhaps the temperature difference of the temperature value that detects of the temperature value that detects of total suction temperature sensor 34 and outdoor environment temperature sensor 33 is lower than 6 ℃, the temperature difference of the temperature value that the temperature value that perhaps temperature sensor 31 detects in the middle part of the outdoor heat exchange coil pipe and outdoor environment temperature sensor 33 detect is lower than 0 ℃, simultaneously the delivery temperature that detects of the delivery temperature that detects of the first DC frequency-changeable compressor exhaust gas temperature sensor 25 and the second DC frequency-changeable compressor exhaust gas temperature sensor 26 all is higher than 30 ℃ and when continuing 3 seconds, can confirm that cross valve 11 commutates successfully;
9) after receiving enabled instruction, heat electric expansion valve 15 and be in closed condition, after delaying time first 50 seconds after the first DC frequency-changeable compressor 1 starts, the aperture of valve reached for 200 steps, kept this aperture until start-up course finishes;
10) hydrojet magnetic valve 17 is in the outage closed condition all the time;
11) in start-up course, receive start-up command indoor set electric expansion valve aperture by closed condition open to 300 the step; Do not receive start-up command indoor set electric expansion valve aperture by closed condition open to 50 the step;
12) in start-up course, the blower motor that receives the indoor set of start-up command is in anti-cold wind control, it is stopped status, be used for preventing that indoor heat exchanger coil pipe middle part temperature is lower than 25 ℃ and blowing cold air, until the temperature value that indoor heat exchanger coil pipe middle part temperature sensor 29 detects is when being higher than 25 ℃, the blower motor of indoor set just begins to start, and carries out automatic rotational speed regulation control according to the temperature at indoor heat exchanger coil pipe middle part; The blower motor that does not receive the indoor set of start-up command is in stopped status all the time.
Specific embodiment two: many indoor sets receive start-up command
1) after direct-current variable was finished defrost process or oil return process, operational mode need to turn to heating mode from refrigeration mode, and at this moment, the electric-control system of off-premises station sends enabled instruction;
2) energising started after gas bypass solenoid valve 10 was received enabled instruction, and after unlatching continued 80 seconds afterwards, gas bypass solenoid valve 10 was closed;
3) receive enabled instruction after, the energising of the first oil return solenoid valve 4 is opened, and the lubricating oil of the first gs-oil separator 2 bottoms is transmitted back in the muffler of the first DC frequency-changeable compressor 1, after continuing 40 seconds, the first oil return solenoid valve 4 is closed;
4) receive enabled instruction after, after delaying time 30 seconds before this, the first DC frequency-changeable compressor 1 begins again to start, enter first paragraph oil return running status, this moment, the running frequency of the first DC frequency-changeable compressor 1 was 40 hertz, after first paragraph oil return running status is moved 80 seconds, the first DC frequency-changeable compressor 1 enters second segment oil return running status, this moment, the running frequency of the first DC frequency-changeable compressor 1 was 70 hertz, when the second DC frequency-changeable compressor 5 finishes its oil return running status, together withdraw from start-up course;
5) receive enabled instruction after, after the second oil return solenoid valve 8 was delayed time first 15 seconds again energising start, the lubricating oil of the second gs-oil separator 6 bottoms is transmitted back in the muffler of the second DC frequency-changeable compressor 5, continue after 40 seconds, the second oil return solenoid valve 8 is closed;
6) after the second DC frequency-changeable compressor 5 is received enabled instruction, began again to start after after the first DC frequency-changeable compressor 1 starts, delaying time before this 15 seconds, enter first paragraph oil return running status, this moment, the running frequency of the second DC frequency-changeable compressor 5 was 40 hertz, after 80 seconds, the second DC frequency-changeable compressor 5 enters second segment oil return running status in this frequency operation, and this moment, the running frequency of the second DC frequency-changeable compressor 5 was 70 hertz, after 120 seconds, withdraw from start-up course in this frequency operation;
7) outdoor fan motor 18 was delayed time first 50 seconds after the second DC frequency-changeable compressor 5 starts, and changed the rotating speed auto-adjustment control over to again;
8) cross valve 11 is delayed time first to switch in 50 seconds after the second DC frequency-changeable compressor 5 starts again and is begun the commutation action; The pressure differential of the system low-voltage force value that the system high pressure force value that detects when high-pressure sensor 27 and low-pressure sensor 24 detect is higher than 6bar, if perhaps the temperature difference of the temperature value that detects of the temperature value that detects of total suction temperature sensor 34 and outdoor environment temperature sensor 33 is lower than 6 ℃, the temperature difference of the temperature value that the temperature value that perhaps temperature sensor 31 detects in the middle part of the outdoor heat exchange coil pipe and outdoor environment temperature sensor 33 detect is lower than 0 ℃, simultaneously the delivery temperature that detects of the delivery temperature that detects of the first DC frequency-changeable compressor exhaust gas temperature sensor 25 and the second DC frequency-changeable compressor exhaust gas temperature sensor 26 all is higher than 30 ℃ and when continuing 3 seconds, can confirm that cross valve 11 commutates successfully;
9) after receiving enabled instruction, heat electric expansion valve 15 and be in closed condition, after delaying time first 60 seconds after the first DC frequency-changeable compressor 1 starts, the aperture of valve reached for 300 steps, kept this aperture until start-up course finishes;
10) hydrojet magnetic valve 17 is in the outage closed condition all the time;
11) in start-up course, receive start-up command indoor set electric expansion valve aperture by closed condition open to 120 the step; Do not receive start-up command indoor set electric expansion valve aperture by closed condition open to 60 the step;
12) in start-up course, the blower motor that receives the indoor set of start-up command is in anti-cold wind control, it is stopped status, until the temperature value that indoor heat exchanger coil pipe middle part temperature sensor 29 detects is when being higher than 25 ℃, the blower motor of indoor set just begins to start, and carries out automatic rotational speed regulation control according to the temperature at indoor heat exchanger coil pipe middle part; The blower motor that does not receive the indoor set of start-up command is in stopped status all the time.
Claims (1)
1. the refrigeration transformation of ownership heat pattern starting method of a multi-gang air-conditioner, this multi-gang air-conditioner comprises two DC frequency-changeable compressors that are connected in parallel, its starting method may further comprise the steps:
1) after direct-current variable was finished defrost process or oil return process, operational mode need to turn to heating mode from refrigeration mode, and at this moment, the electric-control system of off-premises station sends enabled instruction;
2) energising started after gas bypass solenoid valve (10) was received enabled instruction, and after unlatching continued 60 seconds～80 seconds afterwards, gas bypass solenoid valve (10) was closed;
3) receive enabled instruction after, the first oil return solenoid valve (4) energising is opened, the lubricating oil of the first gs-oil separator (2) bottom is transmitted back in the muffler of the first DC frequency-changeable compressor (1), and after continuing 30 seconds～40 seconds, the first oil return solenoid valve (4) is closed;
4) receive enabled instruction after, after delaying time 20 seconds～30 seconds before this, the first DC frequency-changeable compressor (1) begins again to start, enter first paragraph oil return running status, the running frequency of the first DC frequency-changeable compressor this moment (1) is 20 hertz～40 hertz, after first paragraph oil return running status is moved 60 seconds～80 seconds, the first DC frequency-changeable compressor (1) enters second segment oil return running status, the running frequency of the first DC frequency-changeable compressor this moment (1) is 50 hertz～70 hertz, when the second DC frequency-changeable compressor (5) finishes its oil return running status, together withdraw from start-up course;
5) receive enabled instruction after, again energising startup after the second oil return solenoid valve (8) was delayed time first 10 seconds～15 seconds, the lubricating oil of the second gs-oil separator (6) bottom is transmitted back in the muffler of the second DC frequency-changeable compressor (5), continue after 30 seconds～40 seconds, the second oil return solenoid valve (8) is closed;
6) after the second DC frequency-changeable compressor (5) is received enabled instruction, began again to start after after the first DC frequency-changeable compressor (1) starts, delaying time before this 10 seconds～15 seconds, enter first paragraph oil return running status, the running frequency of the second DC frequency-changeable compressor this moment (5) is 20 hertz～40 hertz, after this frequency is moved 60 seconds～80 seconds, the second DC frequency-changeable compressor (5) enters second segment oil return running status, the running frequency of the second DC frequency-changeable compressor this moment (5) is 50 hertz～70 hertz, after 100 seconds～120 seconds, withdraw from start-up course in this frequency operation;
7) outdoor fan motor (18) was delayed time first 30 seconds～50 seconds after the second DC frequency-changeable compressor (5) starts, and changed the rotating speed auto-adjustment control over to again;
8) cross valve (11) is delayed time first to switch in 30 seconds～50 seconds after the second DC frequency-changeable compressor (5) starts again and is begun the commutation action; The pressure differential of the system low-voltage force value that the system high pressure force value that detects when high-pressure sensor (27) and low-pressure sensor (24) detect is higher than 6bar, if perhaps the temperature difference of the temperature value that detects of the temperature value that detects of total suction temperature sensor (34) and outdoor environment temperature sensor (33) is lower than 6 ℃, the temperature difference of the temperature value that the temperature value that perhaps temperature sensor (31) detects in the middle part of the outdoor heat exchange coil pipe and outdoor environment temperature sensor (33) detect is lower than 0 ℃, simultaneously the delivery temperature that detects of the delivery temperature that detects of the first DC frequency-changeable compressor exhaust gas temperature sensor (25) and the second DC frequency-changeable compressor exhaust gas temperature sensor (26) all is higher than 30 ℃ and when continuing 3 seconds, can confirm that cross valve (11) commutates successfully;
9) after receiving enabled instruction, heat electric expansion valve (15) and be in closed condition, after delaying time first 40 seconds～60 seconds after the first DC frequency-changeable compressor (1) starts, the aperture of valve reaches～300 steps of 200 steps, keeps this aperture until start-up course finishes;
10) hydrojet magnetic valve (17) is in the outage closed condition all the time;
11) in start-up course, receive start-up command indoor set electric expansion valve aperture by closed condition open to 120 the step～300 the step; Do not receive start-up command indoor set electric expansion valve aperture by closed condition open to 40 the step～60 the step;
12) in start-up course, the blower motor that receives the indoor set of start-up command is in anti-cold wind control, it is stopped status, until the temperature value that indoor heat exchanger coil pipe middle part temperature sensor (29) detects is when being higher than 25 ℃, the blower motor of indoor set just begins to start, and carries out automatic rotational speed regulation control according to the temperature at indoor heat exchanger coil pipe middle part; The blower motor that does not receive the indoor set of start-up command is in stopped status all the time.
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Address after: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Patentee after: NINGBO AUX ELECTRIC CO., LTD. Address before: 315191, AUX Industrial Park, Mingguang North Road, Jiangshan Town, Ningbo, Yinzhou District, Zhejiang 1166, China Patentee before: Ningbo AUX Electric Co., Ltd. |