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07 <br />0 <br />CONTAIN <br />• Currently RTUs 6 and 7 use a <br />discharge reset program to <br />provide tempered air to the VAVs <br />being served. Program is a linear <br />reset based on Outdoor Air <br />temperature. <br />• This building is equipped with <br />Space Humidity sensors for RTUs <br />6 and 7. <br />• RTUs do not utilize humidity <br />sensors in its operation nor are <br />they present in the controller. <br />• System Hot Water Control is <br />based on an Outdoor Air <br />temperature enable setpoint. <br />Setpoint is set high to ensure hot <br />water reheat is always available <br />to VAVs. Hot Water setpoint is a <br />linear reset program based on <br />Outdoor Air temperature <br />• The RTU reset programming <br />should be modified for <br />discharge air control to include <br />monitoring indoor humidity <br />conditions as it serves VAVs. <br />Sending a cold discharge <br />temperature from the RTU will <br />allow for dehumidification <br />sequences to be enabled. <br />• Add additional humidity <br />sensors to strategic areas in <br />facility. Incorporate <br />dehumidification sequence to <br />force unit to sub cool while <br />allowing VAVs to utilize local <br />electric reheat to maintain <br />space conditions. <br />Consideration should be given <br />to the addition of duct <br />discharge humidification <br />• Having hot water available to <br />the VAVs is essential during <br />dehumidification sequences to <br />prevent overcooling of areas. <br />The reset program may need <br />modification to provide warmer <br />water to the VAV reheats <br />during dehumidification <br />At a Glance <br />• New reset control strategies <br />calculate discharge air setpoints <br />while incorporating increased air <br />ventilation priorities. <br />• Controlling humidity levels can <br />help maximize occupant comfort <br />as well as reduce the risk of <br />microbial growth. Controlling <br />humidity can also help minimize <br />the presence of organic air <br />contaminates. <br />• Maintaining reheat during <br />dehumidification sequences will <br />help ensure occupant comfort <br />