Starting control method for direct-current variable frequency air conditioner operating any units

Abstract

The invention discloses a direct-current set-free air conditioner starting control method. The running modes of a direct-current set-free air conditioner comprise three modes, namely refrigeration running, dehumidification running and heating running; the running mode of the air conditioner is determined by the running mode selected by the early opened indoor unit remote controller or wire controller, namely according to an early opening priority principle; when the air conditioner is started, an unloading electromagnetic valve is opened for 25 to 60 seconds and then is closed; if a single indoor unit is started, the opening of an electronic expansion valve of the indoor unit is at least 120 steps; if a plurality of indoor units are started, the opening of electronic expansion valves of the indoor units is at least 350 steps; and the invention provides a method for starting the refrigeration running and the dehumidification running, and a method for starting the heating running mode. Through the starting method, the one-time starting success rate of the direct-current set-free air conditioner is higher, and the starting method is high-efficiency.

Description

technical field [0001] The invention relates to the field of air conditioner control, in particular to a start-up control method for a DC frequency conversion free tow air conditioner. Background technique [0002] DC frequency conversion free drag air conditioner is a kind of air conditioner product with variable refrigerant flow rate. One outdoor unit can drag one or more indoor units according to the user's requirements. Different series of indoor units and different specifications of the same series of indoor units can be combined arbitrarily . The outdoor unit of the DC inverter free-to-drag air conditioner can be connected to multiple indoor units. When handling the load of the air-conditioned room, it can judge the heating and cooling capacity required by the system and supply the corresponding refrigerant amount to the system, flexibly realizing the independent control of each indoor unit. control. Within the capacity output range of outdoor units, different series...

AI Technical Summary

Problems solved by technology

Therefore, the operating environment of the DC variable frequency free tow air conditioner is very harsh. When starting the DC variable frequency free tow air conditioner under such harsh conditions, if certain measures are not taken, it is easy to cause the air conditioner to fail to start.

[0004] For example, in the prior art, the opening of the electronic expansion valve of the indoor unit is generally less than 100 steps when the air conditioner is started. , it is easy to have a large amount of lubricating oil discharged from the compressor, and a small amount of lubricating oil returned to the compressor, resulting in a lack of oil in the compressor

Moreover, the amount of refrigerant discharged from the compressor is large, and the return air returned to the compressor is small, forming a vacuum phenomenon and causing a low-pressure failure to stop. If the compressor stops due to low-voltage failures for 3 consecutive times during the start-up phase, the compressor cannot be automatically restarted. , must be turned on manually

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