1, welders, gas welders, need to have the quality Supervision Bureau special equipment welding operation certificate, emergency Management Bureau welding operation certificate (commonly known as double certificate)。

2, the installation personnel are required to have no less than 5 years of relevant work experience, the corresponding industry qualification documents, the age of no more than 45 years old is the best。
3, refrigeration professional or trained refrigeration engineers, refrigeration technicians。