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Circulators shall be listed for their intended use based on the heat transfer medium. Circulators shall be installed to allow for service and maintenance. The manufacturer's installation instructions shall be followed for correct orientation and installation.
The circulator shall be installed in such a way that strain from the piping is not transferred to the circulator housing. The circulator shall be permitted to be directly connected to the piping, provided the piping is supported on each side of the circulator. Where the installation of a circulator will cause strain on the piping, the circulator shall be installed on a mounting bracket or base plate. Where means for controlling vibration of a circulator is required, an approved means for support and restraint shall be provided.
The selection and sizing of a circulator shall be based on all of the following:
- Loop or system head pressure, feet of head (m)
- Capacity, gallons per minute (L/s)
- Maximum and minimum velocity, feet per second (m/s)
- Maximum and minimum temperature, °F (°C)
- Maximum working pressure, pounds per square inch (kPa)
- Fluid type
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