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

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Northern Nevada winter nights routinely drop below freezing and southern valleys still see freeze events. Which C-37 DHW designs are the FSEC-accepted freeze methods?

Drainback (collectors empty by gravity) or a closed glycol loop with the correct heat exchanger Open-loop potable water left in the collectors all winter under city pressure An ICS batch collector with no freeze valve on a Reno roof Recirculating 40°F city water through uninsulated 3/8 inch tubing with no control

Correct Answer:

Drainback (collectors empty by gravity) or a closed glycol loop with the correct heat exchanger

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