NV C-37 Solar Practice Questions - Nevada C-37 Solar Contractor Examination Exam

Why does a drainback C-37 system need a higher-head pump than a filled glycol loop of the same flow?

Because the pump must lift the water the full vertical distance into the collectors each start, then overcome friction Because drainback pumps also generate electricity Because drainback piping is always 4 inch PVC Because FSEC requires two pumps in series on every DHW job

Correct Answer:

Because the pump must lift the water the full vertical distance into the collectors each start, then overcome friction

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