Intelligent Controller, Frequency Conversion Controller, Switch Power Supply manufacturer / supplier in China, offering DC Inverter Heat Pump Control PCBA for 4.7kw 4 Pipe Low Temperature Water Heater and Cooler, DC Inverter Heat Pump Control PCBA for 4.7kw 4 System Water Heater and Cooler, DC Inverter Heat Pump Control PCBA for 4.7kw Four System Water Heater and Cooler and so on.