The Unredeemed Captive

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RTU 1W, W, W, 1E, E, E

General This sequence applies to RTU 1W, W, W, 1E, E, E, 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.

College papers on The Unredeemed Captive

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 sensing the space temperature and an airflow sensor in the terminal unit sensing total unit airflow volume shall provide inputs to the terminal unit DDC controller which shall modulate the terminal unit VAV damper, subject to scheduled maximum and minimum cfm limits (operator adjustable), to maintain the space temperature set point (operator adjustable). Upon terminal unit shutdown, corresponding to shutdown of the RTU serving the terminal unit, the unit VAV damper shall close.

Zone temperature sensors shall include a space occupant accessible setpoint adjustment feature, which shall allow a 4°F (individually programmable by unit) occupant setpoint adjustment and a momentary contact pushbutton (individually programmable by unit) to initiate after hours override operation. After hours operation button shall activate RTU serving the terminal unit for a programmable time period (if unit is not operating) and change the terminal unit to normal operation (if unit is in after hours mode) for the same time period.

VAV Boxes with Heat and Series Fan

General These units consist of a variable cold air volume damper, a constant volume discharge fan, an electric heating coil and pressure independent temperature controls. The fan shall run continuously when the unit is active such that the air volume to the space is constant and only the cold air volume varies.

Unit Controls The terminal unit DDC controller shall be activated whenever the RTU serving the terminal unit is running. The terminal unit fan shall operate whenever the unit is activated. An analog temperature sensor sensing the space temperature and an airflow sensor sensing the cold air damper airflow volume shall provide inputs to the terminal unit DDC controller which shall modulate the VAV damper, subject to scheduled minimum and maximum cfm limits (operator adjustable), and energize the stages of electric heat via digital outputs to maintain the space temperature set point (operator adjustable). The electric heat shall not energize until the VAV damper is in its minimum position. Upon terminal unit shutdown, corresponding to shutdown of the RTU serving the terminal unit, the unit cold air VAV damper shall close and the unit fan shall stop.

Zone temperature sensors shall include a space occupant accessible setpoint adjustment feature, which shall allow a 4°F (individually programmable by unit) occupant setpoint adjustment and a momentary contact pushbutton (individually programmable by unit) to initiate after hours override operation. After hours operation button shall activate RTU serving the terminal unit for a programmable time period (if unit is not operating) and change the terminal unit to normal operation (if unit is in after hours mode) for the same time period.

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