I will have to check the pipe sizes, if the original installer decides to cooperate, i will get the exact design parameters of the loop and other specs. As of this morning i still have not heard from him. Thank you DocJenser The geofinity flow center is the original flow center installed that was to pump for both the 5 ton and the 2 ton. The was another variable speed pump installed on one side of the 5 ton. they took that off and added the other flow center to the 5 ton. I should receive the pressure gauge on Thursday. I will be able to take all the measurements necessary to figure out and eliminate all factors that do not cause the 24/7 running and try to figure out exactly why this system is running all the time.