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Once the collector sensor is 20
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
170 degrees the controller will turn off the pumps and initiate the
draining described above to prevent overheating. This simple
design prevents freezing, over-heating and only runs when there is
enough heat/sunlight.
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