Multi-system air conditioning unit and control method thereof

The invention relates to a multi-system air conditioning unit and a control method thereof, the multi-system air conditioning unit comprises a plurality of circulating systems, and the circulating systems are adjusted according to the refrigeration requirement and the running time of the current circulating system. According to the air conditioning unit, a circulating system can be additionally arranged according to the refrigeration requirement, the normal indoor refrigeration requirement is guaranteed, the system can automatically switch another compressor to conduct refrigeration operation after the independent refrigeration system operates for a certain time, and the long-term reliability of the air conditioning unit is improved after the operation is repeated for a long time. 本申请涉及一种多系统空调机组及其控制方法，所述多系统空调机组包括多个循环系统，多个所述循环系统根据制冷需求大小及当前循环系统的运行时间进行调节工作。本申请可更具制冷需求大小增加循环系统，保证室内正常制冷需求，还可以在独立制冷系统运行到一定时间后系统自动切换另一台压缩机制冷运行，长期反复如此增加空调机组的长期可靠性。