Quote:
Originally Posted by strider3700
OK here are my final 2 drawings...
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Strider,
Another way I have seen this done is by using
two circ pumps in series for lifting the water from the tank after draindown.
The idea is that the pumping power required to initially fill the collectors and get the circuit going is greater than the pumping power required to maintain circulation. A timer is used to kick-in the second pump as the first pump comes on so that they are pumping together in series... then when the time period elapses, the power is cut to the second pump and first pump alone maintains full circulation.
They tell me that the head loss from pumping through a non-powered pump is pretty small.
-AC_Hacker