The APR Control provides full-capacity modulation for direct-expansion (DX) air conditioning systems. The unit controls temperature and humidity to maximize comfort and eliminate excessive compressor cycling. The device's patented desuperheating chamber smoothly modulates the A/C system's capacity by varying refrigerant flow according to suction pressure, which changes with the temperature of air crossing the evaporator coil. The unit maintains the system in a dehumidifying mode without risk of coil icing or liquid slugging. It permits multiple evaporator zoning with a single condensing unit, even for out-of-the-way or oddly shaped areas with widely differing load conditions. Each evaporator conditions a different zone, reducing ductwork requirements and the cost of airside controls.

Rawal Devices Inc., 128 F New Boston St., Woburn, MA 01888; 800-727-6447; 781-933-3306 (fax);;

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