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AMERESCO4 <br />Green . Clean . Sustainable <br />ECM 5 — HVAC Control System Upgrades <br />Note: Energy Savings for ECM 5 are included in the calculation for ECM 4, as both measures are required <br />together to capture savings. <br />The HVAC Control System Upgrades ECM savings resulted from installing a web based building <br />automation system (BAS) to control existing equipment and equipment that was added from ECM 4. <br />This allows for much better control and visibility of the equipment, as well as the ability to implement <br />energy saving strategies. <br />- New controllers were installed in the existing enclosures at AHUs 1-10, along with new <br />temperature sensors, duct static sensors, and humidity sensors. <br />- New controllers were installed in new custom-built enclosures at AHUs 11-15, along with new <br />temperature sensors, duct static sensors, and humidity sensors. <br />- A new controller for the chilled water system was installed in the existing enclosure in the <br />central plant, along with new hydronic temperature sensors and a chilled water pressure <br />sensor. <br />- A new controller for the hot water system was installed in the existing enclosure in the central <br />plant, along with new hydronic temperature sensors. <br />- A new controller for the cooling tower system was installed in the existing enclosure in the <br />mechanical room, along with new hydronic temperature sensors. <br />- Existing controllers were integrated with the new BAS for 18 variable air volume boxes. <br />- 14 air handling unit VFDs were integrated with the new BAS, including start/stop, status, and <br />speed control signals. <br />- New two-way electronic control valves were integrated for chilled water and hot water coils <br />as part of the hydronic pumping modifications. <br />- New electronic isolation valves for the three cooling towers were integrated with the new <br />BAS. <br />- The chiller was integrated into the new BAS, including start/stop signals, status signals, alarm <br />signals, new hydronic temperature sensors, and new electronic isolation valves for the chiller. <br />- The museum humidification control was integrated into the new BAS, included an analog <br />control signal for the new humidifier, new gallery humidity sensor, humidity high limit switch, <br />and humidity airflow proving switch. <br />October 15th, 2024 <br />Page 17 <br />