Control method of outdoor fan during heating of variable-frequency multi-connection type air conditioning unit

Abstract

The invention discloses a control method of an outdoor fan during heating of a variable-frequency multi-connection type air conditioning unit. The control method comprises the following specific steps of a, measuring outdoor environment temperature; b, judging whether the outdoor environment temperature is less than or equal to 18 DEG C or not, if so, starting an outdoor fan (1) in high wind level, continuously running for 30 seconds and entering into step c; and if not, starting the outdoor fan (1) in a medium wind level, continuously running for 30 seconds and then directly entering into step d; c, regulating the wind level in which the outdoor fan (1) runs for once every 30 seconds according to the average value of the condensation temperature; and d, regulating the wind level in which the outdoor fan (1) runs for once every 30 seconds according to the average value of the condensation temperature. According to the control method disclosed by the invention, the frequency of the outdoor fan can run reasonably.

Description

technical field [0001] The invention relates to a multi-connected air-conditioning unit, in particular to a method for controlling an outdoor fan when the frequency-variable multi-connected air-conditioning unit is heating. Background technique [0002] The multi-connected air conditioner unit in the prior art includes an outdoor unit, a plurality of indoor units connected in parallel, and two refrigerant circulation main pipes connecting each indoor unit and the outdoor unit. The outdoor unit communicates with multiple indoor units connected in parallel through two refrigerant circulation main pipes. [0003] Each outdoor unit includes a compressor, oil separator, four-way reversing valve, liquid reservoir, throttling device, outdoor heat exchanger (evaporator in heating mode) and gas-liquid separator. The outlet of the compressor communicates with one end of the oil separator, the other end of the oil separator communicates with the first valve port of the four-way revers...

AI Technical Summary

Problems solved by technology

[0007] The operating frequency of the inverter compressor changes continuously with the outdoor ambient temperature, while the heat exchange area of ​​the outdoor heat exchanger remains unchanged, and the heat exchange with the external environment depends on the wind speed of the outdoor fan. The windshield does not match the operating frequency of the compressor of the air conditioner and the outdoor ambient temperature. If the windshield is too high, the noise will be loud and the energy consumption of the fan will be large. In addition, the pressure in the middle of the coil of the indoor unit is too high and the condensation temperature is high, which is prone to high-voltage failure , cannot heat normally, and if the windshield is too low, the pressure in the middle of the coil will be low, the condensation temperature will be low, and normal heating will also be impossible

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