Fluorine deficiency control method for reheating mode of reheating and dehumidification multi-split air conditioner system

Abstract

The invention discloses a fluorine deficiency control method for a reheating mode of a reheating and dehumidification multi-split air conditioner system. The system comprises an outdoor unit and a plurality of indoor units; each indoor unit comprises an indoor unit first heat exchanger, an indoor unit second heat exchanger, a first expansion valve and a second expansion valve, wherein the first expansion valve is connected onto a pipeline of the indoor unit first heat exchanger, and the second expansion valve is connected onto a pipeline of the indoor unit second heat exchanger; the control method comprises a fluorine deficiency judging step: detecting a first difference value between a superheat degree of a first heat exchanger of a started indoor unit and a target superheat degree, and a second difference value between temperature of an outlet pipe of a gas-liquid separator of the outdoor unit and a refrigerant saturation temperature value corresponding to a pressure value of a low-pressure side, and judging whether the system is deficient in fluorine or not according to a result of the first difference value and the second difference value. According to the fluorine deficiency control method for the reheating mode, disclosed by the invention, the reheating and dehumidification multi-split air conditioner system is enabled to judge whether the fluorine is deficient or not accurately, therefore a foundation is laid for timely quit of a fluorine-deficiency state.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a method for controlling fluorine deficiency in a reheating mode of a reheating and dehumidifying multi-line system. Background technique [0002] In the multi-line system, the unit can automatically judge whether it is short of fluorine, and if it is short of fluorine, it can also automatically execute the action of lack of fluorine, thereby exiting the state of lack of fluorine. For the reheat dehumidification system, such as the three-pipe reheat dehumidification system, when the system is running in the reheat mode, there is no effective fluorine deficiency control method in the prior art. There is a lack of effective judgment methods in technology. As for the system already in the fluorine-deficient state, the control method for exiting the fluorine-deficient state in the prior art (that is, its fluorine-deficient execution action) is also not effective for the reh...

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a reheating and dehumidification multi-line system reheating mode lack of fluorine control method, which can overcome the problem in the prior art that the system cannot effectively judge the lack of fluorine in the reheating and dehumidification mode

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