... System Control:1.Imaged system operation chart, showing the temperature of water in/out, the energy level of compressor run, on/off button, run time ... water protection: It works to protect the compressor in case that the load is too large, the temperature of chilled water is too high. ... allowance ±10%,voltage dif between the phase lines±2%;3.The data above is for R22, contact us if that for R134a,R407c ...