• PRIMARY/SECONDARY SYSTEMS Primary chillers and pumps are usually designed in parallel to allow equipment staging. This arrangement allows chillers to come on line only when required during peak cooling hours, thus conserving energy. A FlowCon Flow Controls at each chiller prevents excess flow caused by over-pumping during light load conditions. Having these flow controls also protects equipment warranties as flows will always be in the range specified by the manufacturer. Varying pressures in secondary loops due to opening and closing of temperature control valves are easily compensated for by the modulating action of FlowCon Flow Controls. In addition, having many pumps in parallel demands automatic constant flow controls to insure accurate performance on pump curves, thus conserving energy.