The APR Control is shipped from the Factory set for approximately 40 degrees F. evaporator coil temperature, or to start opening at 118psi (in an R-410A system). We have found this to be an excellent setpoint for most applications, and will not require adjusting the APR Control.
However, every job, system, and application is unique. Our rule of thumb is to allow the APR Control to provide maximum modulation before compressor termination. If the runtime is inadequate or low load operation does not cause suction pressure to fall low enough, you may need to adjust the APR Control Compressor Ratio Reduction Valve (CRR Valve).
Please call Rawal Devices Engineer’s (800-727-6447) at the factory prior to attempting any adjustment. For more information see our Installation page.