Korea Seoul Collecting Project
Principles and characteristics：
●Temperature display:Storage tanks, the collector pipe temperature display:0 to 99℃，temperature error of ±2℃.
●Water tank level display:Storage tank water level display range：0 to 4 water level.
●Timing water-injecting:When it reaches the preset time, the valve D1 opens, automatically water-injecting; When the valve reaches the preset water level, the valve will stop.
●Collector temperature difference circulation:When the temperature difference T1-T2 between water temperature and collector tank water is more than or equal to upper limit(such as 8℃, adjustable)， collector circulation pump P1 will start to inject the low-temperature water into the collector, hot water will enter the hot water tank; When T1-T2 reaches the lower preset temperature, P1 will stop.
●Low water level water-adding:When the water level of the tank is lower than the set level, solenoid valve D1 will open and begin to inject water. When the water level reaches the protection level +1，P1 and D1 will close to prevent from electrically heated dry and pump idling.
●Anti-freezing circulation:In winter when T3 is lower than the preset lower limit(such as 5℃,adjustable)，electric tracing band starts and circulation pump P1 will start, the hot water will be injected into the collection; When the collection temperature T3 is higher than the upper limit (such as 10℃)，P1 will stop to protect the pipeline from freezing(using in water).
●Pipeline circulation:In the period of preset time, circulation pump will start to achieve water recycling. Auxiliary heating:A period of set time, when the tank temperature T2 is lower than the lower limit (such as 45℃)， the electrically heated will start automatically; Auxiliary heating will stop when the tank temperature T2 reaches the upper limit(50℃).