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。

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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。

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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.

注：再循环控制水温自动调节器的温度设置必须比系列N170-M2阀门的设置温度低5至10华氏度，否则，再循环器将会不断运行。

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