HVAC Excellence Master LC-AC Practice Questions - HVAC Excellence Master Specialist - Light Commercial Air Conditioning (Written Examination) Exam

Modern rooftop economizer controllers include Fault Detection and Diagnostics (FDD). A common FDD fault is:

Outdoor-air or return-air temperature sensor out of range / shorted Refrigerant overcharge Belt tension too high Filter pressure drop too low

Correct Answer:

Outdoor-air or return-air temperature sensor out of range / shorted

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