The APR-410 control provides full capacity modulation for all sizes of direct-expansion air-conditioning systems that use R-410A non-ozone-depleting hydrofluorocarbon refrigerant. The control continuously and automatically matches AC system capacity/output to changing load conditions. As a result, the unit is said to provide dramatically improved humidity control without overcooling the space and also eliminates many common maintenance problems associated with excess system capacity such as coil icing, liquid slugging and excessive compressor cycling. Because an air-conditioning system equipped with the company’s control continuously monitors the heat content of return air, it is said to be more economical than systems relying only on end-type controls such as thermostats and humidistats. The control is said to smoothly modulate the air-conditioning system’s capacity by varying refrigerant flow according to suction pressure, which changes with the temperature of air crossing the evaporator coil. The control maintains the system in a dehumidifying mode without risk of coil icing or liquid slugging. The control is said to be ideal for VAV systems where fluctuating or reduced air flow across the evaporator can cause coil icing.
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