Armstrong Fluid Technology will introduced the enhanced Design Envelope IPC 9521 integrated plant control system at AHR Expo. Featuring the new TowerMax option, the IPC 9521 significantly improves the operating efficiencies of plants using either identical or non-identical chillers. Designed with advanced operating algorithms to reduce energy and water consumption, the TowerMax option is an optimization feature that can help variable-speed chiller plants achieve up to 45% energy savings, Armstrong states. It compliments both new and existing building management systems, and works with all brands of chillers and cooling towers to meet the requirements of Green Mark, an industry-leading green building rating system. It controls up to five chillers, cooling towers and BAS. Armstrong Fluid Technology.