Trane Tracer VV550 Installation, Operation And Maintenance Manual page 82

Troubleshooting
Table 50. Controller diagnostics (continued)
Diagnostic
Normal
a.When a temperature sensor fails after being valid, the controller generates a diagnostic to indicate the sensor loss condition. The controller
automatically clears the diagnostic once a valid sensor temperature value is present (non-latching diagnostic).
b.When the unit configuration is invalid, all outputs are de-energized (0 VDC) so that they return to their normal state.
c.If system mode is heat or auto with a warm or hot primary air temperature.
Translating Multiple Diagnostics
The controller senses and records each diagnostic independently of other diagnostics. It is possible
to have multiple diagnostics present simultaneously. The diagnostics are reported in the order they
occur. The reported alarm message is made up of two parts. The first part is the Trane alarm level.
The second part is the alarm message text. The level and the text are separated by one space. The
total length must be equal to or less than 30 characters.
levels and reported alarm message text.
Table 51. Trane alarm levels
Level
Table 52. Latching diagnostics, reset required
Level
Table 53. Automatically resetting diagnostics
Level
82
Air valve
Normal
Description
P Normal; occurs immediately following a power-up reset
0 Normal
1 Informational message
2 Service required
3 Critical alarm
Reported alarm message text
2 Invalid unit configuration
2 Controller failure
Reported alarm message text
Discharge air temperature failure
2
(ventilation flow control with reheat)
Discharge air temperature failure
2
(ventilation flow control without reheat)
Discharge air temperature failure (space
2
temperature control or flow tracking)
Primary air temperature 
2
a, b
failure
2 Local space setpoint failure
2 Space temperature failure
2 Flow sensor failure
2 Flow sensor calibration failure
1 Freeze protection active
Fan
Normal
Table 51
Description
Cannot use current configuration
Controller self test failure
Description
No valid discharge air temperature
Discharge air temperature valid, then
not valid
Discharge air temperature valid, then
not valid
Primary air temperature valid, then not
valid
Local space setpoint input valid, then not
b
valid
a, b
Space temperature valid, then not valid
Flow signal not valid. Sensor open or
shorted
Flow did not calibrate successfully
(The Kavlico® pressure sensor input voltage
has to be 0.25 +/-0.06 volts during calibration.
If it is outside this range, the diagnostic is
generated.)
Ventilation flow control unit opened the
water valve(s) due to low source
temperature
Reheat
Normal
through Table 55 describe alarm
CNT-SVX17G-EN