NV C-1A Boilers Practice Questions - Nevada C-1A Boilers Contractor Examination Exam

Why can a very cold return temperature damage a non-condensing cast-iron or steel boiler?

The heat exchanger is designed to stay dry; sustained flue-gas condensation corrodes ordinary iron and steel. Cold return water always increases AFUE above 98 percent on non-condensing units. Cold return water disables the relief valve. NFPA 31 requires return water above 250°F on oil boilers.

Correct Answer:

The heat exchanger is designed to stay dry; sustained flue-gas condensation corrodes ordinary iron and steel.

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