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

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A drainback DHW array and an unglazed pool array both need a vacuum-relief or air-inlet device at the high point. What does that device do?

It pressurizes the array to 150 psi overnight It lets air in so the collectors can drain instead of holding a siphon It is the potable T&P valve It generates the differential-control signal

Correct Answer:

It lets air in so the collectors can drain instead of holding a siphon

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