Principles and Characteristics:

●Heat collector temperature difference circulation:Automatic temperature difference circulation is used in the heater collector system. When the temperature T1 reaches the preset and temperature difference between T1 and T2 is higher than the preset temperature, collector circulation pump will start until the temperature difference is lower than preset.

●Water supply of pipes circulation:Temperature difference controller is set to control the switch of solenoid valve to avoid heat outflow from heat collector tank by circulation system. F1 is normally closed solenoid valve, when the temperature of T2 and T3 is higher than the preset, F1 will start to go on the indirect heating solar heat medium circulation until the temperature difference is lower than the preset.

●Auxiliary heating:In a period of preset time, when the temperature of tank is lower than preset, auxiliary heating will start automatically until the temperature is higher than the preset.