What is a Low Ambient control and what is its function?
The Fan Cycling control (Sometimes referred to as Condenser Head pressure control, or Low Ambient Control) is a switch that makes contact on pressure rise. The sensing line is piped into the discharge line and is set to maintain the condenser head pressure during lower outdoor ambient temperatures. If the fan were to run all the time, the head pressure would remain very low and system efficiency would fall. Fan Cycling will compensate for this to a certain extent by allowing the head pressure to rise to moderate levels. The Low Ambient control is optional on package and split systems, and is standard on 100% outside air units.
