Assume a single-zone constant-volume system with an economizer is installed. In the occupied mode, when

the thermostat calls for cooling, which of the following occurs?

a. The supply air fan stops.
b. The outdoor dampers move to fully closed.
c. The economizer acts as the first stage of cooling, if conditions permit.
d. The relief fan cycles on.


c

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Answer the following statement true (T) or false (F)

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A current magnetic relay opens and closes its contacts based on the ____.

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