Processes of the System

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Once the collector sensor is 15 degrees warmer than the storage tank sensor, the controller will power on both pumps. The fluid from the heat exchanger is pumped up to and through the collector, down into the drain back tank and back through the heat exchanger (repeating cycle). As the collector loop fluid meanders through the heat exchanger the heat is transferred to the storage tank water via the storage side pump.

When the collector temperature is 5 degrees
warmer than the storage tank the controller will turn off the pumps.

As a result the fluid in the collector loop will drain down via gravity to the drain back tank. If the storage tank reaches 130 degrees the controller will turn off the pumps and initiate the draining described above to prevent overheating/scale.  This simple design prevents freezing, over-heating and only runs when there is enough heat/sunlight.

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