Trane Tracer VV550 Installation, Operation And Maintenance Manual page 30

Sequence of Operations
The auto-commissioning test does not require a flow sensor or an auxiliary temperature
sensor. If there is no flow sensor, the controller runs in pressure-dependent mode. An
auxiliary 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
Summit
time/date stamp. No third 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 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.
The mode field of reported unit status reports TEST when the controller is in the auto-
commissioning sequence.
Table 20.Auto-commissioning test sequence
Item Test action
Primary air
1. Turn Off fan and reheat.
valve and
2. Close air valve and modulating water valve (if present).
a
airflow
3. Calibrate the airflow sensor.
4. Open the air valve to 40% of the configured maximum airflow. Record the position
of the air valve.
5. Open the air valve to 100% of the configured maximum airflow. Record the position
of the air valve.
b
Fan flow
1. Record the auxiliary temperature at the configured maximum airflow.
2. Close the primary air valve.
3. Turn On the fan (if present).
4. Monitor auxiliary temperature for 3 minutes or until it changes by 10°F.
5. Record the auxiliary temperature.
Local reheat
1. If no fan is present, open the air valve to the configured minimum local heating
b
hydronic
airflow.
2. If the fan is present, close the air valve and turn On the fan.
3. Record the auxiliary temperature.
4. Open the water valve to 100% open.
5. Monitor the auxiliary temperature for 10 minutes or until it changes by 10°F.
30
™ ™
BAS or the Rover service tool. The auto-commission command contains a
Reported data
Primary air valve
position at 40% and
100% flow
Starting and ending
auxiliary
temperature
Starting and ending
auxiliary
temperature
CNT-SVX17G-EN