Second switch fuction : the switch is for maintainance issue only . not affect to machine operation 旁路开关切换功能：本切换开关系工程人员定期保养，或维修服务时使用，不误机械生产时间影响工作的进行。
During use , the furniture must be maintained regularly by being processed with polishing wax to make it as bright as new , thus extending its using life 家具在使用过程中，须定期保养，其方法可用抛光进行打腊处理，可使家具光亮如新，延长家具寿命。
Provide proper calibration , maintenance and regular checking of leakages from joints pipes and worn or blocked nozzles ( uneven spray pattern ) 定期保养、维修及调较喷雾器，并检查喷雾器可能出现的毛病如药液由接口、喉管或破损处漏出；喷咀受到腐蚀或阻塞
