NABCEP Solar Heating Installation Professional Flashcards
6 cards from real NABCEP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 NABCEP Solar Heating Installation Professional flashcards as text
What is a thermosiphon solar water heating system and where is it commonly used?
Answer: A passive system where natural convection circulates fluid; common in mild climates with no freeze risk
Thermosiphon systems use natural convection — hot fluid rises into the storage tank above the collectors — eliminating pumps and controls; they are used in warm, freeze-free climates.
Which building code section requires solar water heating systems to be installed with a means of preventing scalding from excessively hot water?
Answer: UPC/IPC Plumbing Code sections requiring a tempering or mixing valve on solar water heaters
Uniform Plumbing Code and International Plumbing Code require a thermostatic mixing (tempering) valve on solar water heaters because solar storage tanks are often set above 140°F to prevent Legionella.
What is the purpose of a check valve in an active solar thermal system's piping loop?
Answer: To prevent reverse thermosiphoning at night that would lose heat from the storage tank to the cold collectors
At night, cooled fluid in collectors can sink and pull warm fluid from the storage tank upward through the collectors, losing stored heat; a check valve prevents this reverse flow.
Which installation orientation and tilt maximizes annual solar thermal energy collection in the continental US?
Answer: True south at a tilt angle approximately equal to the local latitude
Facing collectors true south and tilting them at the local latitude angle maximizes annual solar irradiance interception across all seasons in the Northern Hemisphere.
What is the primary advantage of a closed-loop solar thermal system over an open-loop system?
Answer: It protects the collector loop from freezing and corrosion while keeping potable water separate
Closed-loop systems use antifreeze in a separate loop, providing freeze protection and preventing mineral scale buildup in expensive collectors while maintaining potable water purity.
What does SRCC OG-300 certification indicate for a solar water heating system?
Answer: The complete solar water heating system has been rated and certified for annual energy performance
SRCC OG-300 certifies the entire system — including collector, storage, and controls — and provides annual energy output estimates used for rebate qualification and consumer comparison.