1233Input Output Point Definition

The third step is to define the input and output points required to achieve the monitoring and control desired, in the most cost-effective or efficient manner. This requires an in-depth appraisal of such items as the equipment list, layout of building spaces, method of building construction, HVAC physical plant makeup and layout, methods of heating and cooling, types of secondary HVAC distribution systems and controls, and the condition of the mechanical equipment and existing controls.

The definition of a control point should include a listing of all inputs that will influence the functioning of that point. The installation specifications should detail this information and indicate the nature of the influence as follows:

Output Point Analog Input Point Notes

AHU #1 Outside Air Temperature

Room #935 Temperature

Room #837 Temperature Room of greatest

Room #715 Temperature Demand

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