The new Rawal Devices Web site,, demonstrates how the company’s APR Control provides continuous capacity modulation for direct-expansion air conditioning systems (including VAV and make-up air systems), allowing them to dehumidify without overcooling.

Easily installed in new AC systems or in older systems as a retrofit, the APR Control automatically matches system capacity/output to changing load conditions. By allowing the system to operate at less than full capacity, the device not only improves comfort by controlling humidity but also reduces service calls by eliminating coil icing, liquid slugging and excessive compressor cycling. APR Control models designed to withstand the higher operating pressures of environmentally friendly systems that use R-410a non-ozone-depleting refrigerant are also available.