NV C-37B Solar Space Heating Practice Questions - Nevada C-37B Solar Space Heating Contractor Examination Exam

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In a drainback solar space-heating collector loop, supply and return piping must be pitched so the collectors empty when the pump stops. The FSEC solar manual practice slope is at least:

1/8 inch per foot toward the drainback reservoir, with no traps 1/4 inch per foot toward the drainback reservoir, with no traps or uphill pockets Level piping is required so the pump does not lose prime 1 inch per foot toward the collectors so they stay full of water

Correct Answer:

1/4 inch per foot toward the drainback reservoir, with no traps or uphill pockets

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