As shown in the illustrated refrigeration system piping schematic diagram with the various accessories and controls and equipped with an air-cooled condenser with high side pressure controls, what statement is true concerning the fan cycling control pressure switch? GS-RA-39 Illustration GS-RA-39: the U.S. Coast Guard has not released this illustration.

Correct Answer: Option C — With a condenser fitted with a single fan driven by a multi-speed electric motor, the fan speed would decrease under low ambient temperature conditions.

Air-cooled condensers utilizing multi-speed fan motors reduce fan RPM under low ambient conditions to prevent excessive head pressure drop. Maintaining adequate condensing pressure ensures proper pressure differentials across the thermal expansion valve for stable system operation.