Trane Tracer Uc page 30

Tracer™ UC400 Controller Operations
Alert Boxes
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Operating Status
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Space
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Points Out of Service: Indicates the number of points that are currently set to Out of Service.
Active Alarms: Indicates the number of active alarms requiring attention. When active alarms
are present, the information icon displays the color of the highest priority alarm. Click the Active
Alarms box to go to the Alarms screen.
Overrides: Indicates the number of overrides that are currently active. If any overrides are
active, the icon displayed in the box turns blue.
Note: Overrides initiated with the TU Balancing Tool will not be indicated here.
Occupancy Status: The Tracer UC400 controller has four (4) valid occupancy modes that
display under the operating status– Occupied mode, Unoccupied mode, Occupied Standby
mode, and Occupied Bypass mode.
Heat /Cool Status: The heat/cool status displays the heating and cooling mode of the Tracer
UC400 controller. This is where the controller displays the heating or cooling mode of the
controller. The controller can receive communicated requests for heating or cooling operation.
Responses are: Heat, Cool, Calibrate, and Test. Test will be displayed in air or water valve is
being overridden.
Actual Air Valve Position: Reports air valve position
Air Valve Position Control: The Tracer UC400 controller displays either pressure dependent
or pressure independent status if it has a valid flow input to the controller from the flow ring
and pressure transducer. The controller can operate with or without a valid flow value; the
airflow is hard wired only. It operates under pressure dependent control or pressure
independent control.
– Pressure dependent control: When a valid flow value is not present, the controller operates
under pressure dependent control (position control). Pressure dependent control
substitutes the air valve position for the flow measurement for all control actions.
– Pressure independent control: When a valid flow value is present, the controller operates
under pressure independent control. If after an airflow sensor failure, the airflow returns to
the valid range (airflow value greater than 10% of configured nominal airflow), the controller
automatically resumes pressure independent control.
Discharge Airflow: Displays the current discharge airflow when in pressure independent
operation.
Airflow Setpoint (Active): Displays the active airflow setpoint. The airflow setpoint will be
determined based on the heat cool mode status, and the required heating or cooling capacity.
Space CO Concentration: CO
2
The controller compares the space CO
determines the demand ventilation rate of the zone. The resulting ventilation rate is called the
effective ventilation setpoint. The effective ventilation setpoint is the outdoor airflow required
to provide ventilation. It is used to calculate the ventilation ratio of the zone.
Space Temperature: The temperature, as reported by the zone sensor.
Space Temperature (Active) Setpoint: The active (or actual) setpoint currently used by the
Tracer UC400 controller. Can be either Heating or Cooling depending on operating mode.
Space Temperature Setpoint BAS: Shows the setpoint being communicated to the VAV unit
from a BAS system.
Space Temperature Setpoint Local: Displays setpoint from local zone sensor.
Space Temperature Setpoint Default: Displays default configured setpoint.
-based demand control ventilation uses the space CO
2
concentration to the configured band of CO
2
value.
2
values and
2
VAV-SVX07B-EN