You can quickly determine which loop is the most hydraulically remote by running one lineup. In this lineup, take a guess at which loop is the most remote (a good guess is usually the loop furthest away from the pumps, or a loop that has a high required flow rate).  Run the lineup with the FCV in this loop set to fully open.  If the results do not show any FCVs with invalid results, you've found the most remote loop.  If only one FCV has invalid results, that one is the most remote loop.  If several FCVs have invalid results (i.e., they are acting as pumps), the easiest way to tell which one is in the most remote loop is to look at the FCV results.  The FCV with the largest head gain identifies the loop that is the most remote.

NOTE: If there are a lot of FCVs in your system with invalid results, a quick way to pick the one with the highest pressure gain is to display the List Window for the controls and then sort the list by the control valve dP. The control valve with the highest negative dP is the most hydraulically remote.