Commissioning Tab - Trane Tracer Uc

Commissioning Tab

Actions
•
•
•
Performing a Two-point Air Balance
1. Select the Drive to Maximum Airflow button to activate the Drive to Max button.
2. Click the Drive to Max button to start the Drive to Maximum Airflow operation. The changing
VAV-SVX07B-EN
Zero Air and Water Valve Position (Start Button): The calibration sequence enables the
controller to calibrate the air valve position and the water valve position, as well as calibrate
the flow sensor.
Auto-commissioning (Start Button): The controller auto-commissioning test sequence
validates both the proper operation of all outputs and the capability to measure all inputs. The
purpose of the test sequence is to minimize the labor required to commission the unit in the
field.
The auto-commissioning test does not require a flow sensor or a discharge or supply air
temperature sensor. If there is no flow sensor, the controller runs in pressure-dependent mode.
A temperature sensor in the discharge air stream is required for testing of the fan and the
reheat. The fan and the reheat are not tested if the discharge air temperature sensor is not
present. The fan is not tested if there is no fan. Local reheat is tested, if it is present. Remote
reheat is not tested.
The sequence starts on receipt of an auto-commission command from the Tracer TU service
tool start button or the Tracer SC. The auto-commission command contains a time/date stamp.
No 3rd party tool can start the auto-commissioning sequence. The user then chooses to
commission all VAV boxes or one VAV box. The results of auto-commissioning are contained
in a structured network variable called reported auto commissioning report. The controller
places the time/date stamp in the report. The structure is loaded with the default values for all
of the fields when the auto commissioning test sequence starts. The fields are updated with the
results as the sequence progresses. The data is held until the next auto-commissioning test.
If an auto-commission command is received in the middle of an auto-commissioning cycle, the
auto-commissioning sequence restarts. If an auto-commission command is received during
calibration, calibration aborts and restarts after auto-commissioning finishes. If an abort auto-
commission command is received during the calibration portion of the primary air valve test,
it is honored after the air valve calibration finishes.
Calibrate Air Valve: Use the Tracer TU service tool Air Balancing tool and the Trane Air
Balancing Calculation spreadsheet to perform a basic two-point air balance for the Tracer
UC400 controller - VAV application.
Note: The Air Balancing Calculation spreadsheet is included with Tracer TU service tool. A full
discussion of air balancing is beyond the scope of this document. Refer to the Air
Systems for Tracer SC Applications Guide (BAS-APG007).
Discharge Airflow and Air Valve/Damper Position values are updated as the Drive to Maximum
Airflow operation continues. In addition, a progression bar displays above the Drive to
Maximum Airflow box. When the operation is complete, the air valve remains at the maximum
position until it is released by selecting Drive to Minimum Airflow or by clicking Done or Cancel.
Note: If communication with the controller is interrupted, the override to maximum is released
automatically at the end of the default duration.
a. Airflow Setpoint Maximum: Displays the setpoint value (cfm or L/min) while the Drive to
Max operation is in progress.
b. Discharge Airflow; Displays the airflow (cfm or L/min).
c. Air Valve / Damper Position: Displays the value of the Actual Air Valve Position Setpoint while
the Drive to Max operation is in progress.
Tracer™ UC400 Controller Operations
43