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

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A drainback C-37B space-heating array has a 20-foot outdoor return with a 2-inch sag at mid-span. What is the field correction?

Leave the sag; the pump will blow the pocket clear every morning Cap the return and operate as a thermosiphon Add ethylene glycol and ignore the sag Repitch the return at 1/4 inch per foot with no low pockets so the line empties to the indoor reservoir

Correct Answer:

Repitch the return at 1/4 inch per foot with no low pockets so the line empties to the indoor reservoir

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