![]() ![]() Keep in mind that a system may have multiple purposes. A makeup air unit, for example, needs to be interlocked with the exhaust fan(s) that create the need for the makeup air unit. The designer should also identify any other equipment that is affected by the sequence. Perhaps the system needs to maintain pressure relationships for a particular space or group of spaces. Sometimes the purpose is maintaining acceptable temperatures for a process (e.g., a data center). One of the first questions to ask before moving forward is: “What is the purpose of the system?” Often the purpose is comfort heating or cooling for human occupants. Step 2: Categorize the purpose of the equipment. Components that are not inputs or controlled variables should be left out to maintain a simple diagram that is easy to read. Include all inputs and variables that must be controlled. The latter permits use of the same diagram for multiple units with similar configurations. The flow rates could be included if desired, or diagrams can be left more generic. Airflow and water flow rates do not need to be included as this information should be included on equipment schedules. The flow diagram should also identify the airflow pathway and piping connections. The unit has an exhaust fan, outside and supply airflow measuring stations, mixing box, pre-filter, final filter, heating hot water coil, chilled water coil, and supply fan. Figure 1 shows the main components of the air handling unit (AHU) being considered for our example. ![]()
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