... : Hotel,Villa, Hospital, High-Low Residential Export Markets: Global VFD Constant Pressure Water Supply System Product BriefB603S series ... a better energy saving Freeze-Proofing Function:suitable to low temperature area, prevent pump from freezing Anti-clogging Function ... Control Various of water supply Fault Alarm Function: High-Pressure, Low-Pressure, Low-Level, Transducer Error etc. As many as 22 ...