How Does The APR Control Work
As the heat content of return air drops, the suction pressure drops opening the APR Control. The compressor discharge gas gets sent into the desuperheating chamber then back to the suction line. A liquid injection valve mixes liquid with the discharge gas (in the desuperheating chamber) when the mixed gas temperature rises to 60F. The APR Control derates the evaporator coil capacity extending the run time while keeping the active portion of the coil at a constant temperature (below dewpoint) thereby dehumidifying during the extended run period. Watch the video below for more information.