... : <95%, no condensation allowed 17) Altitude: 0~1000 m, 1000~4000 m with derating 18) 30 kinds of protection function ... is smaller 5) Timing switchover function: Prevent pump from rust, balance every pump lifetime 6) Over pressure/under pressure alarm, ... Water supply, Air compressor, Central air conditioner, Oil transportation pump, Waste water treatment, Music Fountain PID Constant Pressure Water ...