CN102997368A - Intelligent defrosting control method for parallel multiple on-line unit with multiple compressors - Google Patents
Intelligent defrosting control method for parallel multiple on-line unit with multiple compressors Download PDFInfo
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Abstract
The invention discloses an intelligent defrosting control method for a parallel multiple on-line unit with multiple compressors. The intelligent defrosting control method comprises the following steps: (1) when the multiple on-line unit operates in a heating mode, continuously operates for 30-60 minutes, lasts for 2-5 minutes and satisfies one of the following conditions, an outdoor electrical control system emits a defrosting command; (2) a first direct-current inverter compressor starts a defrosting process after receiving the defrosting command; (3) a second direct-current inverter compressor starts a defrosting process after receiving a starting command; and (4) the first direct-current inverter compressor and the second direct-current inverter compressor exit the defrosting process if one of the following conditions is satisfied in the defrosting process. The intelligent defrosting control method is used for coordinating and controlling the action sequences of the components in the intelligent defrosting process, so that the air conditioner can normally enter the defrosting process, process the defrosting process and exit the defrosting process.
Description
Technical field
The present invention relates to the air-conditioning control field, is a kind of Multi-compressor parallel multi-connected machine intelligent defrosting control method specifically.
Background technology
For heat pump type air conditioning apparatus, the intelligent defrosting technology of heating mode running is very important, and this is that outdoor temperature is lower, when air humidity is larger, is easy to frosting on the air-conditioning unit outdoor heat exchanger because during the aircondition heating operation.After the outdoor heat exchanger frosting, frost layer has been stopped up the passage between the outdoor heat exchanger aluminium fin, has reduced ventilation, the reduction of ventilation has affected again the heat transfer effect of outdoor heat exchanger, make frost thickness more and more thicker, heat transfer effect so forms vicious circle worse and worse.Therefore, must carry out at set intervals one time defrost process, melt the frost layer of fin surface, the heat transfer effect of outdoor heat exchanger is recovered.Current, existing control method relates to the aircondition intelligent defrosting method, and these methods mainly are confined to study action and the action control of cross valve and the condition of releasing defrost process of compressor in the entry condition, defrost process of aircondition defrosting.
For existing direct-current variable-frequency multi-connection machine technology, basic module has 5 kinds of specifications such as 8,10,12,14 and 16, but at present vortex DC frequency-changeable compressor separate unit ability only has 4,8 and 10 etc., therefore, during 12 basic modules of design, just must adopt one 4 and one 8 s' DC frequency-changeable compressor parallel connection, equally, 14 basic modules must adopt one 4 and 10 DC frequency-changeable compressor parallel connections, and 16 basic modules just must adopt two 8 DC frequency-changeable compressors to compose in parallel.In the direct-current variable-frequency multi-connection machine system of compressor parallel, except DC frequency-changeable compressor, also have other control parts, such as electric expansion valve, cross valve, indoor fan motor, outdoor fan motor and various magnetic valves etc.This shows, Multi-compressor parallel multi-connected machine device is very complicated, in the intelligent defrosting process, each control parts in control procedure, the action sequencing, it is very important namely controlling sequential, enter defrost process with guaranteeing the aircondition normal reliable, carry out defrost process and release defrosting, and prior art does not all relate to the method for this respect.
Summary of the invention
The technical problem to be solved in the present invention is, provide a kind of and can coordinate the action sequence of respectively controlling in the intelligent defrosting process between the parts, by the Multi-compressor parallel multi-connected machine intelligent defrosting control method that enters defrost process with being conducive to the aircondition normal reliable, carries out defrost process and withdraw from defrosting.
Technical solution of the present invention provides following a kind of Multi-compressor parallel multi-connected machine intelligent defrosting control method, may further comprise the steps:
(1) multi-connected machine is when heating mode moves, as continuous operation 30～60min, and when continuing 2～5min and one of meeting the following conditions, outdoor electric-control system namely sends the defrosting instruction: if the 1. outdoor environment temperature that detects of outdoor temperature sensor≤0 ℃, and during the defrosting temperature that detects of defrosting temperature sensor≤0.8 * outdoor environment temperature-10 ℃; If during the defrosting temperature that the 2. outdoor environment temperature that detects of outdoor temperature sensor＞0 ℃, and defrosting temperature sensor detects≤0.2 * outdoor environment temperature-10 ℃;
After (2) first DC frequency-changeable compressors were received the defrosting instruction, running frequency namely was down to 20～40Hz operation after 10～20 seconds, and running frequency rises to 80～100Hz again, the beginning defrost process;
After (3) second DC frequency-changeable compressors were received enabled instruction, running frequency namely was down to 20～40Hz operation after 10～20 seconds, and running frequency rises to 80～100Hz again, the beginning defrost process;
(4) first DC frequency-changeable compressors and the second DC frequency-changeable compressor if satisfy one of following condition, then withdraw from defrost process in defrost process: 1. defrosting time surpasses 10min; 2. the defrosting temperature that the temperature sensor that defrosts detects 〉=12 ℃; 3. the high-pressure sensor detects system high pressure 〉=35Bar, at this moment, the first DC frequency-changeable compressor and the second DC frequency-changeable compressor are carried out and are withdrawed from the defrosting control procedure, running frequency was down to 20～40Hz operation after 10～20 seconds, rise to again 50～60Hz operation 10～20 seconds, afterwards, the first DC frequency-changeable compressor and the second DC frequency-changeable compressor running frequency go to the running frequency before the defrosting, continue automatic regulation and control;
(5) receive the defrosting instruction after, the first oil return solenoid valve and the second oil return solenoid valve all are in closed condition;
(6) the outdoor fan motor receive enter the defrosting instruction after, delay time stopped in 10～15 seconds; Until withdraw from defrosting, and the first DC frequency-changeable compressor and the second DC frequency-changeable compressor running frequency be down to 20～40Hz operation after 10～20 seconds, the outer blower motor of opening chamber, continuation automatic control process;
(7) cross valve receive enter the defrosting instruction after, time-delay outage in 10～15 seconds is closed, before the first DC frequency-changeable compressor and the second DC frequency-changeable compressor withdraw from defrosting running frequency are down to 20～40Hz end of run afterwards 5～10 seconds the time on electric-opening;
(8) after receiving the defrosting instruction, heat the electronic expansion valve opening time-delay and rise to 350～480pls. after 10～15 seconds, after defrost process finishes on the cross valve during electric-opening, heating electronic expansion valve opening begins to turn down, until the system low-voltage that low pressure sensor detects maintains 〉=level of 0.5Bar, withdraw from the defrosting control procedure at the first DC frequency-changeable compressor and the execution of the second DC frequency-changeable compressor, running frequency is after second running frequency 50～60Hz moves 10～20 seconds, heat electronic expansion valve opening and rise to the front aperture operation of defrosting 50～70 seconds, afterwards, change automatic control state over to;
(9) in defrost process, gas bypass solenoid valve and hydrojet magnetic valve all are in the outage closed condition;
(10) after receiving the defrosting instruction, receive the indoor set of start-up command after time-delay 10～15 seconds, the indoor electronic expansion valve opening is down to 150pls., the indoor electronic expansion valve opening rises to 200～250pls. with the speed of 10pls./30s～20pls./30s afterwards, after electric-opening commutation on the defrosting end cross valve, with the front aperture operation 10min～15min that defrosts, afterwards, enter again auto-adjustment control;
(11) after receiving the defrosting instruction, do not receive the indoor set of start-up command after time-delay 10～15 seconds, the indoor electronic expansion valve opening rises to 150pls. by 40～60pls., the indoor electronic expansion valve opening rises to 200～250pls. with the speed of 10pls./30s～20pls./30s afterwards, withdraw from the defrosting control procedure at the first DC frequency-changeable compressor and the execution of the second DC frequency-changeable compressor, after 10～20 seconds, the indoor electronic expansion valve opening is down to 40～60pls. before the defrosting to running frequency second running frequency 50～60Hz operation;
(12) after receiving the defrosting instruction, the indoor set blower motor time-delay that receives start-up command was shut down in 10～15 seconds afterwards, after finishing, defrosting is in anti-cold wind control, namely still be in stopped status, prevent that indoor heat exchanger coil pipe middle part temperature is lower than 25 ℃ and blow a cold wind over, until indoor heat exchanger coil pipe middle part temperature is higher than 25 ℃, the indoor set blower motor is just opened, according to coil pipe middle part adjustment rotating speed;
(13) after receiving the defrosting instruction and in the whole defrost process, the indoor set blower motor that does not receive start-up command is in stopped status.
After adopting the method for above step, the present invention compared with prior art has the following advantages: method of the present invention, coordinate exactly the action sequence of respectively controlling in the intelligent defrosting process between the parts, by entering defrost process with being conducive to the aircondition normal reliable, carry out defrost process and withdrawing from defrosting.
Description of drawings
Fig. 1 is the DC frequency converting air-conditioner refrigerant system configurations schematic diagram that Multi-compressor parallel multi-connected machine intelligent defrosting control method of the present invention is controlled.
Fig. 2 is the sequential chart of each parts action in the Multi-compressor parallel multi-connected machine intelligent defrosting control method 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, the gas bypass solenoid valve, 11, cross valve, 12, outdoor heat exchanger, 13, the outdoor fan motor, 14, the 4th check valve, 15, heat electric expansion valve, 16, high-pressure reservoir, 17, the hydrojet magnetic valve, 18, cutoff, 19, the indoor electronic expansion valve, 20, the indoor fan motor, 21, indoor heat exchanger, 22, the return-air stop valve, 23, gas-liquid separator, 24, low-pressure sensor, 25, the first DC frequency-changeable compressor vollyball temperature sensor, 26, the second DC frequency-changeable compressor vollyball temperature sensor, 27, the high-pressure sensor, 28, the indoor heat exchanger inlet temperature sensor, 29, indoor heat exchanger coil pipe middle part temperature sensor, 30, the indoor heat exchanger outlet temperature sensor, 31, outdoor heat exchanger coil pipe middle part temperature sensor, 32, the defrosting temperature sensor, 33, the outdoor environment temperature sensor, 34, total suction temperature sensor.
The specific embodiment
Technical scheme of the present invention the specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing for better illustrating.
As shown in Figure 1, for thought of the present invention is described better, set forth as an example of the direct-current variable-frequency multi-connection machine of two DC frequency-changeable compressor parallel connections example.
As shown in Figure 2, be the direct-current variable-frequency multi-connection machine systematic schematic diagram that is formed in parallel by 2 DC frequency-changeable compressors, comprising: the first DC frequency-changeable compressor 1, the first gs-oil separator 2, the first check valve 3, the first oil return solenoid valve 4, the second DC frequency-changeable compressor 5, the second gs-oil separator 6, the second check valve 7, the second oil return solenoid valve 8, the 3rd check valve 9, gas bypass solenoid valve 10, cross valve 11, outdoor heat exchanger 12, outdoor fan motor 13, the 4th check valve 14, heat electric expansion valve 15, high-pressure reservoir 16, hydrojet magnetic valve 17, cutoff 18, indoor electronic expansion valve 19, indoor electronic expansion valve 20, indoor fan motor 21, return-air stop valve 22, gas-liquid separator 23, low-pressure sensor 24, the first DC frequency-changeable compressor vollyball temperature sensor 25, the second DC frequency-changeable compressor vollyball temperature sensor 26, high-pressure sensor 27, indoor heat exchanger inlet temperature sensor 28, indoor heat exchanger coil pipe middle part temperature sensor 29, indoor heat exchanger outlet temperature sensor 30, outdoor heat exchanger coil pipe middle part temperature sensor 31, defrosting temperature sensor 32, outdoor environment temperature sensor 33, total suction temperature sensor 34.
Below in conjunction with above-mentioned DC frequency converting air-conditioner, a kind of Multi-compressor parallel multi-connected machine of the present invention intelligent defrosting control method embodiment is elaborated:
Example 1:
(1) multi-connected machine is when heating mode moves, as continuous operation 30min, and when lasting 3min meets the following conditions, outdoor electric-control system namely sends the defrosting instruction: if the outdoor environment temperature that the outdoor temperature temperature sensor detects≤0 ℃, and during the defrosting temperature that detects of defrosting temperature sensor 32≤0.8 * outdoor environment temperature-10 ℃;
After (2) first DC frequency-changeable compressors 1 were received the defrosting instruction, running frequency namely was down to the 30Hz operation after 20 seconds, and running frequency rises to 80Hz again, the beginning defrost process;
After (3) second DC frequency-changeable compressors 2 were received enabled instruction, running frequency namely was down to the 30Hz operation after 20 seconds, and running frequency rises to 80Hz again, the beginning defrost process;
(4) first DC frequency-changeable compressors 1 and the second DC frequency-changeable compressor 2 if satisfy one of following condition, then withdraw from defrost process in defrost process: 1. defrosting time surpasses 10min; 2. the defrosting temperature that the temperature sensor 32 that defrosts detects 〉=12 ℃; 3. high-pressure sensor 27 detects system high pressure 〉=35Bar, at this moment, the first DC frequency-changeable compressor 1 and the second DC frequency-changeable compressor 2 are carried out and are withdrawed from the defrosting control procedure, running frequency was down to the 40Hz operation after 20 seconds, rise to again 60Hz operation 20 seconds, afterwards, the first DC frequency-changeable compressor 1 and the second DC frequency-changeable compressor 2 running frequencies go to the running frequency before the defrosting, continue automatic regulation and control;
(5) receive the defrosting instruction after, the first oil return solenoid valve 4 and the second oil return solenoid valve 8 all are in closed condition;
(6) outdoor fan motor 13 receive enter the defrosting instruction after, delay time stopped in 15 seconds; Until withdraw from defrosting, and the first DC frequency-changeable compressor 1 and the second DC frequency-changeable compressor 2 running frequencies are down to the 40Hz operation after 10～20 seconds, the outer blower motor of opening chamber, continuation automatic control process;
(7) cross valve 11 receive enter the defrosting instruction after, time-delay outage in 15 seconds is closed, the first DC frequency-changeable compressor 1 and the second DC frequency-changeable compressor 2 withdraw from defrosting afterwards running frequency be down to the 40Hz end of run in the time of front 10 seconds on electric-opening;
(8) after receiving the defrosting instruction, heat the time-delay of electric expansion valve 15 apertures and rise to 350pls. after 15 seconds, after defrost process finishes on the cross valve during 11 electric-opening, heating electric expansion valve 15 apertures begins to turn down, until the system low-voltage that low-pressure sensor 24 detects maintains 〉=level of 0.5Bar, withdraw from the defrosting control procedure at the first DC frequency- changeable compressor 1 and 2 execution of the second DC frequency-changeable compressor, running frequency is after second running frequency 560Hz moves 20 seconds, heat electric expansion valve 15 apertures and rise to the front aperture operation of defrosting 70 seconds, afterwards, change automatic control state over to;
(9) in defrost process, gas bypass solenoid valve 10 and hydrojet magnetic valve 17 all are in the outage closed condition;
(10) after receiving the defrosting instruction, receive the indoor set of start-up command after time-delay 15 seconds, indoor electronic expansion valve 19 apertures are down to 150pls., indoor electronic expansion valve 19 rises to 250pls. with the speed of 10pls./30s afterwards, after electric-opening commutation on the defrosting end cross valve 11, with the front aperture operation 10min that defrosts, afterwards, enter again auto-adjustment control;
(11) after receiving the defrosting instruction, do not receive the indoor set of start-up command after time-delay 15 seconds, indoor electronic expansion valve 19 rises to 150pls. by 50pls., indoor electronic expansion valve 19 apertures rise to 250pls. with the speed of 10pls./30s afterwards, withdraw from the defrosting control procedure at the first DC frequency- changeable compressor 1 and 2 execution of the second DC frequency-changeable compressor, after 20 seconds, indoor electronic expansion valve 19 apertures are down to the 50pls. before the defrosting to running frequency second running frequency 60Hz operation;
(12) after receiving the defrosting instruction, indoor set blower motor 20 time-delays that receive start-up command were shut down in 15 seconds afterwards, after finishing, defrosting is in anti-cold wind control, namely still be in stopped status, prevent that indoor heat exchanger coil pipe middle part temperature is lower than 25 ℃ and blow a cold wind over, until indoor heat exchanger coil pipe middle part temperature is higher than 25 ℃, the indoor set blower motor is just opened, according to coil pipe middle part adjustment rotating speed;
(13) after receiving the defrosting instruction and in the whole defrost process, the indoor set blower motor that does not receive start-up command is in stopped status.
Example 2:
(1) multi-connected machine is when heating mode moves, as continuous operation 30min, and when lasting 2min meets the following conditions, outdoor electric-control system namely sends the defrosting instruction: if the outdoor environment temperature that outdoor temperature temperature sensor 33 detects＞0 ℃, and during the defrosting temperature that detects of defrosting temperature sensor 32≤0.2 * outdoor environment temperature-10 ℃;
After (2) first DC frequency-changeable compressors 1 were received the defrosting instruction, running frequency namely was down to the 30Hz operation after 15 seconds, and running frequency rises to 90Hz again, the beginning defrost process;
After (3) second DC frequency-changeable compressors 2 were received enabled instruction, running frequency namely was down to the 30Hz operation after 15 seconds, and running frequency rises to 90Hz again, the beginning defrost process;
(4) first DC frequency-changeable compressors 1 and the second DC frequency-changeable compressor 2 if satisfy one of following condition, then withdraw from defrost process in defrost process: 1. defrosting time surpasses 10min; 2. the defrosting temperature that the temperature sensor 32 that defrosts detects 〉=12 ℃; 3. high-pressure sensor 27 detects system high pressure 〉=35Bar, at this moment, the first DC frequency-changeable compressor 1 and the second DC frequency-changeable compressor 2 are carried out and are withdrawed from the defrosting control procedure, running frequency was down to the 30Hz operation after 10 seconds, rise to again 50Hz operation 10 seconds, afterwards, the first DC frequency-changeable compressor 1 and the second DC frequency-changeable compressor 2 running frequencies go to the running frequency before the defrosting, continue automatic regulation and control;
(5) receive the defrosting instruction after, the first oil return solenoid valve 4 and the second oil return solenoid valve 8 all are in closed condition;
(6) the outdoor fan motor receive enter the defrosting instruction after, delay time stopped in 10 seconds; Until withdraw from defrosting, and the first DC frequency-changeable compressor 1 and the second DC frequency-changeable compressor 2 running frequencies are down to the 30Hz operation after 10～20 seconds, the outer blower motor of opening chamber, continuation automatic control process;
(7) cross valve 11 receive enter the defrosting instruction after, time-delay outage in 10 seconds is closed, the first DC frequency-changeable compressor 1 and the second DC frequency-changeable compressor 2 withdraw from defrosting afterwards running frequency be down to the 30Hz end of run in the time of front 5 seconds on electric-opening;
(8) after receiving the defrosting instruction, heat the time-delay of electric expansion valve 15 apertures and rise to 400pls. after 10 seconds, after defrost process finishes on the cross valve during electric-opening, heating electric expansion valve 15 apertures begins to turn down, until the system low-voltage that low-pressure sensor 24 detects maintains 〉=level of 0.5Bar, withdraw from the defrosting control procedure at the first DC frequency- changeable compressor 1 and 2 execution of the second DC frequency-changeable compressor, running frequency is after second running frequency 60Hz moves 10 seconds, heat electric expansion valve 15 apertures and rise to the front aperture operation of defrosting 50 seconds, afterwards, change automatic control state over to;
(9) in defrost process, gas bypass solenoid valve 10 and hydrojet magnetic valve 17 all are in the outage closed condition;
(10) after receiving the defrosting instruction, receive the indoor set of start-up command after time-delay 10 seconds, indoor electronic expansion valve 19 apertures are down to 150pls., indoor electronic expansion valve 19 apertures rise to 200pls. with the speed of 20pls./30s afterwards, after electric-opening commutation on the defrosting end cross valve 11, with the front aperture operation 10min that defrosts, afterwards, enter again auto-adjustment control;
(11) after receiving the defrosting instruction, do not receive the indoor set of start-up command after time-delay 10 seconds, indoor electronic expansion valve 19 apertures rise to 150pls. by 40pls., indoor electronic expansion valve 19 apertures rise to 200pls. with the speed of 20pls./30s afterwards, withdraw from the defrosting control procedure at the first DC frequency- changeable compressor 1 and 2 execution of the second DC frequency-changeable compressor, after 10 seconds, indoor electronic expansion valve 19 apertures are down to the 40pls. before the defrosting to running frequency second running frequency 60Hz operation;
(12) after receiving the defrosting instruction, indoor set blower motor 20 time-delays that receive start-up command were shut down in 10 seconds afterwards, after finishing, defrosting is in anti-cold wind control, namely still be in stopped status, prevent that indoor heat exchanger coil pipe middle part temperature is lower than 25 ℃ and blow a cold wind over, until indoor heat exchanger coil pipe middle part temperature is higher than 25 ℃, the indoor set blower motor is just opened, according to coil pipe middle part adjustment rotating speed;
(13) after receiving the defrosting instruction and in the whole defrost process, the indoor set blower motor that does not receive start-up command is in stopped status.
Claims (1)
1. Multi-compressor parallel multi-connected machine intelligent defrosting control method may further comprise the steps:
(1) multi-connected machine is when heating mode moves, as continuous operation 30～60min, and when continuing 2～5min and one of meeting the following conditions, outdoor electric-control system namely sends the defrosting instruction: if the 1. outdoor environment temperature that detects of outdoor temperature sensor≤0 ℃, and during the defrosting temperature that detects of defrosting temperature sensor≤0.8 * outdoor environment temperature-10 ℃; If during the defrosting temperature that the 2. outdoor environment temperature that detects of outdoor temperature sensor＞0 ℃, and defrosting temperature sensor detects≤0.2 * outdoor environment temperature-10 ℃;
After (2) first DC frequency-changeable compressors were received the defrosting instruction, running frequency namely was down to 20～40Hz operation after 10～20 seconds, and running frequency rises to 80～100Hz again, the beginning defrost process;
After (3) second DC frequency-changeable compressors were received enabled instruction, running frequency namely was down to 20～40Hz operation after 10～20 seconds, and running frequency rises to 80～100Hz again, the beginning defrost process;
(4) first DC frequency-changeable compressors and the second DC frequency-changeable compressor if satisfy one of following condition, then withdraw from defrost process in defrost process: 1. defrosting time surpasses 10min; 2. the defrosting temperature that the temperature sensor that defrosts detects 〉=12 ℃; 3. the high-pressure sensor detects system high pressure 〉=35Bar, at this moment, the first DC frequency-changeable compressor and the second DC frequency-changeable compressor are carried out and are withdrawed from the defrosting control procedure, running frequency was down to 20～40Hz operation after 10～20 seconds, rise to again 50～60Hz operation 10～20 seconds, afterwards, the first DC frequency-changeable compressor and the second DC frequency-changeable compressor running frequency go to the running frequency before the defrosting, continue automatic regulation and control;
(5) receive the defrosting instruction after, the first oil return solenoid valve and the second oil return solenoid valve all are in closed condition;
(6) the outdoor fan motor receive enter the defrosting instruction after, delay time stopped in 10～15 seconds; Until withdraw from defrosting, and the first DC frequency-changeable compressor and the second DC frequency-changeable compressor running frequency be down to 20～40Hz operation after 10～20 seconds, the outer blower motor of opening chamber, continuation automatic control process;
(7) cross valve receive enter the defrosting instruction after, time-delay outage in 10～15 seconds is closed, before the first DC frequency-changeable compressor and the second DC frequency-changeable compressor withdraw from defrosting running frequency are down to 20～40Hz end of run afterwards 5～10 seconds the time on electric-opening;
(8) after receiving the defrosting instruction, heat the electronic expansion valve opening time-delay and rise to 350～480pls. after 10～15 seconds, after defrost process finishes on the cross valve during electric-opening, heating electronic expansion valve opening begins to turn down, until the system low-voltage that low-pressure sensor detects maintains 〉=level of 0.5Bar, withdraw from the defrosting control procedure at the first DC frequency-changeable compressor and the execution of the second DC frequency-changeable compressor, running frequency is after second running frequency 50～60Hz moves 10～20 seconds, heat electronic expansion valve opening and rise to the front aperture operation of defrosting 50～70 seconds, afterwards, change automatic control state over to;
(9) in defrost process, gas bypass solenoid valve and hydrojet magnetic valve all are in the outage closed condition;
(10) after receiving the defrosting instruction, receive the indoor set of start-up command after time-delay 10～15 seconds, the indoor electronic expansion valve opening is down to 150pls., the indoor electronic expansion valve opening rises to 200～250pls. with the speed of 10pls./30s～20pls./30s afterwards, after electric-opening commutation on the defrosting end cross valve, with the front aperture operation 10min～15min that defrosts, afterwards, enter again auto-adjustment control;
(11) after receiving the defrosting instruction, do not receive the indoor set of start-up command after time-delay 10～15 seconds, the indoor electronic expansion valve opening rises to 150pls. by 40～60pls., the indoor electronic expansion valve opening rises to 200～250pls. with the speed of 10pls./30s～20pls./30s afterwards, withdraw from the defrosting control procedure at the first DC frequency-changeable compressor and the execution of the second DC frequency-changeable compressor, after 10～20 seconds, the indoor electronic expansion valve opening is down to 40～60pls. before the defrosting to running frequency second running frequency 50～60Hz operation;
(12) after receiving the defrosting instruction, the indoor set blower motor time-delay that receives start-up command was shut down in 10～15 seconds afterwards, after finishing, defrosting is in anti-cold wind control, namely still be in stopped status, prevent that indoor heat exchanger coil pipe middle part temperature is lower than 25 ℃ and blow a cold wind over, until indoor heat exchanger coil pipe middle part temperature is higher than 25 ℃, the indoor set blower motor is just opened, according to coil pipe middle part adjustment rotating speed;
(13) after receiving the defrosting instruction and in the whole defrost process, the indoor set blower motor that does not receive start-up command is in stopped status.
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