The AC unit is not operating correctly, how do I troubleshoot with an APR Control in the system?

The APR Control must be isolated during system troubleshooting. Otherwise, you will not be able to judge what the unit is doing when an APR control is operating. You will need to isolate the control from the system with either a ball valve or solenoid valve (with manual stem) in the suction line between the outlet of the control and the “T” on the suction line. It is imperative that isolation ball valves be installed on all connections to the APR Control device. Without these isolation valves the APR Control can mask several types of issues that would otherwise be easily diagnosed.