The Unredeemed Captive

RTU: 1W, 2W, 3W, 1E, 2E, 3E

General: This sequence applies to RTU 1W, 2W, 3W, 1E, 2E, 3E, which consists of a outside air damper, variable speed fan; cooling coils, and filter section.

RTU Control: When any box associated with the RTU is in the occupied mode or is scheduled to be on then the unit is commanded on. The RTU factory controller then command and control the variable speed fan, the cooling stages and the outside air damper.

Monitoring Signals: The DDC system is monitoring the static pressure, the discharge air and return air temperatures thru duct sensors. Also is monitoring the filter alarm thru a differential pressure switch.



VAV Boxes with no Heat no Fan
General: These units consist of a variable air volume damper and related controls for variable air volume pressure independent temperature control.
Unit Controls: The terminal unit DDC controller shall be activated whenever the RTU serving the terminal unit is running. An analog temperature sensor sensi...