28 VAV-SVX07F-EN
UC400 Controller Points and Parameters
You can use the Tracer TU service tool to view or adjust points and parameters in the Tracer UC400
controller. It is a software application for monitoring, configuring, balancing, and testing Trane unit
controllers, such as the Tracer UC400 controller.
Refer to the following documents fo
r prod
uct information including an introduction to the Tracer
TU service tool, its utilities, screens, concepts, and procedures:
•The Tracer TU Servic
e Tool Getting Started Guide (TTU-SVN01)
•The Tracer TU Help for
Programmable Controllers (Online Help included with Tracer TU)
This section contains information about points and parameters specific to VAV configurations.
They
are grouped according to the Tracer TU utility screens.
• “Status Utility”
• “Equipment Settings,” p. 30
Status Utility
The Status Utility is displayed by default when you start a Tracer TU session. This subsection
presents VAV related items you will see on the Unit Summ
ary, Analog, Binary, Multistate, and
Controller Status screens.
Unit Summary Screen
Note: Example based on a UC400 configured for Space Temperature Control.
The Tracer TU service tool will launch and display the status of the Tracer UC400 contro
ller. The Unit
Summary screen arranges relevant status information under the Operating Status, Space,
Ventilation, and Outputs expanding boxes. The following points apply to VAV operations and are
explained here.
Operating Status
• 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 Posi
tion: 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 v
alue is not present, th
e 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 v
alue is prese
nt, 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 Airflo
w: Displays the cur
rent discharge airflow when in pressure independent
operation.
To Next Page
Loading...
