The APR control is designed to provide full-capacity modulation for direct-expansion air conditioning systems of all sizes. Responding quickly to changing conditions, the unit controls temperature and humidity to maximize comfort and eliminate excessive compressor cycling, the company says. It continuously monitors the heat content of return air. According to the manufacturer, the device's desuperheating chamber smoothly modulates the air conditioning system's capacity by varying refrigerant flow according to suction pressure, which changes the temperature of air crossing the evaporator coil. It maintains the system in a dehumidifying mode without the risk of coil icing or liquid slugging, states the company.

Rawal Devices Inc., 25 Maybrook Rd., Waterbury, CT 06708; 800-727-6447 or 203-574-3073; 203-596-1313 (fax);

eProduct #183