Viconics VWZS Application Guide Manual de usuario descargar pdf (Pagina 27)

Economizer Mode and Fresh Air Measurement Station

If the fresh air damper is to be used for both free cooling and minimum fresh air volume control

(economizer mode and fresh air measurement station, but without CO

level control), only the Min FA

parameter and the free cooling sequence will be active.

- The FA Range parameter should be set to a value higher than 0 CFM (0 CFM disables the

fresh air control).

- Min FA (minimum fresh air) parameter should be set to the desired level.

The FA Range parameter value should be set to the maximum capacity of the fresh air measurement

station. Therefore the relationship between air volumes and input signals can be established. For example,

if the fresh air station capacity is 10000 CFM, set FA Range to 10000.

This will set the relationship of

0 VDC = 0 CFM and 10VDC = 10000 CFM.

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Viconics VWZS Application Guide Manual de usuario Pagina 27