Multi-line defrosting control method
A control method and multi-connection technology, applied in heating and ventilation control systems, refrigerators, compressors, etc., can solve problems such as shortened service life, frequent defrosting frequency, large high and low pressure difference, etc., to prolong service life , to avoid injury, reduce the effect of pressure
Active Publication Date: 2017-09-05
NINGBO AUX ELECTRIC
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Problems solved by technology
But for the multi-split unit, the number of indoor and outdoor units in the system is large, and the pipeline is long, which belongs to the large pipeline system. The high and low pressure difference of the large pipeline system is generally large. When reversing, the compressor and four The one-way reversing valve needs to withstand a lot of pressure, which will generate a lot of noise, and cause a certain degree of damage to the compressor and the four-way reversing valve, and the frequency of defrosting in the system is relatively frequent, which will inevitably increase the damage to the compressor and four-way reversing valve. damage to the reversing valve, shortening its service life
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[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0024] Such as figure 1 As shown, the multi-line defrosting control method of the present invention has specific steps as follows.
[0025] a. After receiving the defrosting command when the multi-line unit is running in the normal heating mode, the frequency conversion compressor 1 will reduce the frequency to 20-40Hz and run for 20-60s. If the frequency is reduced to 30Hz and run for 30s, the external unit electronic expansion valve 2 Open to 100-200 steps, such as 150 steps, the electronic expansion valve 3 of the internal machine is opened to 300-400 steps such as 300 steps; the supercooled electronic expansion valve 4 is closed.
[0026] b. The frequency conversion compressor 1 stops, and the subcooling electronic expansion valve 4 is opened to 300-480 steps, if it is opened to 350 steps, the air bypass solenoid valve 5 is opened, and the...
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The invention discloses a defrosting control method of a multi-connected air conditioner unit. The defrosting control method comprises the key steps that before a four-way reversing valve (6) carries out reversing to enter in a defrosting mode, an undercooling electronic expansion valve (4) is firstly opened to 300-480 paces, and a gas bypass solenoid valve (5) is opened; and after defrosting is finished, and before the four-way reversing valve (6) carries out reversing again to enter in a heating mode, the undercooling electronic expansion valve (4) also needs to be opened to 300-480 paces, and the gas bypass solenoid valve (5) is opened. According to the defrosting control method of the multi-connected air conditioner unit, noise is lowered, damage to an inverter compressor (1) and the four-way reversing valve (6) is lowered, and the service life of the inverter compressor (1) and the service life of the four-way reversing valve (6) are prolonged.
Description
technical field [0001] The invention relates to a multi-connected air conditioner unit, in particular to a multi-connected defrosting control method. Background technique [0002] The multi-connected air conditioner unit in the prior art is referred to as a multi-connected unit for short, and it includes one or more outdoor units, multiple indoor units connected in parallel, and two refrigerant circulation main pipes connecting each indoor unit and outdoor unit. If there is one outdoor unit, the outdoor unit is connected to multiple indoor units connected in parallel through two refrigerant circulation main pipes; Multiple indoor units are connected. [0003] Each outdoor unit includes a compressor, an oil separator, a four-way reversing valve, an outdoor heat exchanger (a condenser for cooling and an evaporator for heating), an electronic expansion valve for the outdoor unit and a gas-liquid separator. The outlet of the compressor is connected with the inlet of the oil se...
Claims
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IPC IPC(8): F25B47/02F25B49/02F24F11/00
CPCF25B13/00F25B47/025F25B49/02F25B2313/02741F25B2600/2513F25B41/31
Inventor 杨敏
Owner NINGBO AUX ELECTRIC