This sequence is set up specifically for mornings that are quite warm so that, if necessary, the AHU can get a head start. The AHU controller will then check the logic programming, which states that the AHU should turn on if the indoor air temperature is over 80 degrees at 6 am. Only if the building engineer notices abnormalities that warrant turning the AHU on earlier than usual or possibly shutting it off entirely would the Operator command be required. The AHU’s controller will initially check to verify if the operator is commanding it. We’ll utilize an air handling unit (AHU) to cool a floor in this example, beginning in the morning. In this case, the Operator has priority over the other two because the Weekly Schedule is given the lowest priority. The weekly schedule specifies which days and times the machinery should be on or off. Operator: The person operating the system gives explicit instructions on how it should function.īy using logic programming, the machinery operates according to the previously discussed order of operations. Let’s pretend there are 3 priority levels for the purpose of simplicity. There are also a number of priority levels in these bigger systems that govern which directions a piece of equipment should be obeying. Additionally, it prevents us all from having to manually switch on and off machinery.Īs you may expect, larger HVAC systems and more complicated machinery require larger and more complex operational sequences. We may dial in those sequences to guarantee the best comfort and energy efficiency by composing statements that direct the equipment on how to function under specific scenarios.
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