Viconics VBZS Application Guide Manual do Utilizador descarregar pdf (Página 25)

Economizer Control Mode Only

If the fresh air damper is to be used only for free cooling purposes (economizer mode, without fresh air

measurement station or CO

control), only the Min Pos parameter and the free cooling sequence will be

active.

The FA Range parameter should be set to 0 CFM. (Default Value = 0 CFM)

- Set the Chngstpt parameter to desired value which free cooling is enabled. (Default Value =

55°F)

If the outside air temperature is greater than the changeover setpoint, then normal mechanical cooling will

be used. If the outside air temperature is less than or equal to the changeover setpoint, then free cooling

will be enabled and mechanical cooling stages will be locked out.

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Viconics VBZS Application Guide Manual do Utilizador Página 25