1. Altitude : not exceed 1000m . No corrosive gas and steam , indoor installation .2.Input water temperature: ≤30°C output water temperature products : ≤40°C3. Measure deviation of capacitance not exceed -5%~+10% of standard value, measure each terminal of capacitor between max capacitance and min capacitance no more than 1.10 on series connection.4.On rated voltage of power frequency AC ,when 20±10°C, Tangent value of loss angle : ≤ 0.00055.Permit long-term operate no higher than rated voltage and rated frequency and operate 12 hours everyday on the voltage against rated frequency 1.05Un.6.Permit long-term operate on current not exceed 1.15In