Concerning air-conditioning system steam heating coils, what statement is true?

Correct Answer: Option D — Steam heating coils are usually the header type and, if possible, vertically installed.

Steam heating coils in marine HVAC systems are typically the header type to ensure efficient steam distribution and condensate drainage. Vertical installation is preferred to facilitate gravity-assisted condensate removal, preventing water hammer and ensuring the coil remains free of trapped condensate, which could otherwise lead to freezing or thermal stress.