With Flow Switch Option symbol This is an ON/OFF switch detecting low levels of the circulating fluid. When the fluid volume is 1 L/min. or less, “ERR16” is displayed and the Thermo-con stops. This switch is installed between the circulating fluid inlet and the tank, and built into the Thermo-con. Refer to page 1381. F HEC F With flow switch Aircooled HEC002-A5�ｭ-F HEC006-A5�ｭ-F Type Applicable model NPT Thread Option symbol The connection parts of circulating fluid piping, facility water piping and circulating fluid drain port are NPT thread type. N HEC N NPT thread Aircooled HEC002-A5�ｭ-N HEC006-A5�ｭ-N Type Applicable model Series HEC-A Options Note) Options have to be selected when ordering the Thermo-con. It is not possible to add them after purchasing the unit. 1393 HRG HRS HRZ HRZD HRW HEC HEB HED HEA IDH