A timer, aquastat, or both may be used to control the operation of the pump.
配合时间控制器， 温度控制器， 或二者的一起使用， 来控制循环泵的运行。
2
AQUASTAT Country Profiles describe the state of water resources and agricultural water use with special attention to the water resource, irrigation, and drainage sub-sectors.
A QUASTAT国家概况描述水资源和农业用水状况，特别注意水资源和排灌分部门。
3
NOTE: Recirculating control aquastat must be set at least 5oF to 10oF lower than the temperature setting of the Series N170-M2 valve, otherwise the recirculator will run continually.