Multi-split system and refrigerant recovery control method thereof

Abstract

The invention discloses a multi-split system and a refrigerant recovery control method thereof. The multi-split system comprises an outdoor unit, at least one set of hydraulic modules and at least oneset of indoor modules, wherein a first recovery mode and a second recovery mode are set, and therefore complex refrigerant recovery operation can be completed without professional technicians; and correspondingly, a refrigerant is recycled to the outdoor unit or the indoor modules and the hydraulic modules, and recycling is thorough, safe and reliable.

Description

technical field [0001] The present invention relates to the technical field of multi-connected systems, in particular to a multi-connected system and a refrigerant recovery control method thereof. Background technique [0002] When conventional air-conditioning products need to recover the refrigerant to the outdoor unit, the indoor unit is usually turned on for cooling, a pressure gauge is installed on the air pipe stop valve of the outdoor unit, and the high and low voltage protection switch of the outdoor unit is shorted or shielded. After start-up, close the shut-off valve of the liquid pipe first, and then close the shut-off valve of the air pipe when the pressure value of the shut-off valve of the air pipe is lower than a certain pressure, and then cut off the power of the outdoor unit to complete the refrigerant collection operation. There are some problems with this one: [0003] 1) It requires very professional technicians to complete this operation with their expe...

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Problems solved by technology

[0003] 1) It requires very professional technicians to complete this operation with their experience. During the operation, it is necessary to manually pass the pressure gauge or rely on experience without installing the pressure gauge. Waste is not environmentally friendly, and it is not clear how much refrigerant will be lost. The next time the refrigerant is released, the system’s operating status will change, which will affect the ability and energy efficiency of the air conditioner, or the time for collecting refrigerant is too long, and the compressor idling time is too long, which may easily cause the compressor to overheat. Burnt and other parts

[0004] 2) For the multi-functional multi-connection with complex multi-connection + hydraulic module in the piping system, there are both air-conditioning indoor units and hydraulic modules in the system. There are three pipes between the outdoor unit, the indoor unit and the hydraulic module. The hydraulic module has Multiple solenoid valves cannot collect refrigerant by simply turning on the cooling water of the indoor unit and the cooling water of the hydraulic module. The refrigerant in some pipelines cannot be recovered, which is not safe. The operator does not know which pipelines still contain refrigerant. If it is disassembled directly, it is easy to cause injury to personnel, and it also causes a waste of refrigerant

[0005] In addition, for the multi-function multi-connection with complex piping system + hydraulic module, if it is necessary to recycle the refrigerant to the indoor unit, some of the above problems also exist

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