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.

Question

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.

Accepted Answer

Option B: 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 exposed to dropping ambient temperatures require reduced heat rejection capacity to maintain adequate head pressure. Multi-speed fan controls achieve this by reducing fan speed during low ambient conditions to prevent excessive pressure drops.