Trane UniTrane Installation, Operation And Maintenance Manual page 140

Diagnostics and Troubleshooting
Test Button
You can use the Test button on the controller either during
installation to verify proper end device operation or during
troubleshooting. When you press the Test button, the
controller exercises all outputs in a predefined sequence.
The first and last outputs of the sequence reset the
controller diagnostics. See
about the manual output test.
Table 77. Tracer® ZN010 and ZN510 controller diagnostics
Diagnostic
Auxiliary temperature failure
Condensate overflow detection
Entering water temperature
Fan mode failure
Invalid unit configuration failure
Low temperature detection
Maintenance required
Setpoint
Zone temperature failure
Notes:
1. Priority Level: Diagnostics are listed in order from highest to lowest priority. The controller senses and records each diagnostic independently of other
diagnostics. It is possible to have multiple diagnostics present simultaneously. The diagnostics affect unit operation according to priority level.
2. Latching: A latching diagnostic requires a manual reset of the controller; while a non-latching diagnostic automatically resets when the input is
present and valid.
3. Enabled: End device is allowed to run if there is a call for it to run.
4. Disabled: End device is not allowed to run even if there is a call for it to run.
5. No Action: The diagnostic has no affect on the end device.
Table 78. Tracer® ZN520 controller diagnostics
Diagnostic
Condensate overflow
Low temperature detection
Low air flow - fan failure
Space temperature failure
Entering water temp failure
Discharge air temp low limit
Discharge air temp failure
Fresh air temp failure
Relative humidity failure
Generic 4–20mA failure
CO Input failure
2
Maintenance required
Local fan mode failure
Local setpoint failure
Invalid unit configuration
Normal—power up
1
The generic binary output (TB4-1, TB4-2) state is unaffected by all unit diagnostics.
Notes:
2
When the entering water temperature is required but not present, the Tracer
condition. The controller automatically clears the diagnostic once a valid entering water temperature value is present (non-latching diagnostic).
When the entering water temperature sensor fails, the controller prohibits all hydronic cooling operation, but allows the delivery of heat when
heating is required. In the Cool mode, all cooling is locked-out, but normal fan and outdoor air damper operation is permitted.
3
When the outdoor air temperature sensor has failed or is not present, the Tracer® ZN520 controller generates a diagnostic to indicate the sensor
loss condition. The controller automatically clears the diagnostic once a valid outdoor air temperature value is present (non-latching diagnostic).
When the outdoor air temperature sensor fails or is not present, the controller prohibits economizer operation.
140
p. 138 for more information
Latching
No
Yes
No
No
Yes
Yes
Yes
No
No
Fan
Off Valves Closed, Fresh air damper Closed, Electric heat Off, Baseboard heat Off
Off Valves Open, Fresh air damper Closed, Electric heat Off, Baseboard heat Off
Off Valves Closed, Fresh air damper Closed, Electric heat Off, Baseboard heat Off
Off Valves Closed, Fresh air damper Closed, Electric heat Off, Baseboard heat Off
1
On Valves Enabled , Fresh air damper Enabled
Off Valves Open, Fresh air damper Closed, Electric heat Off, Baseboard heat Off
Off Valves Closed, Fresh air damper Closed, Electric heat Off, Baseboard heat Off
On Valves Enabled, Fresh air damper Minimum position
On Valves Enabled, Fresh air damper Enabled, Electric heat Enabled, Baseboard heat Enabled
On Valves Enabled, Fresh air damper Enabled, Electric heat Enabled, Baseboard heat Enabled
On Valves Enabled, Fresh air damper Enabled, Electric heat Enabled, Baseboard heat Enabled
On Valves Enabled, Fresh air damper Enabled, Electric heat Enabled, Baseboard heat Enabled
On Valves Enabled, Fresh air damper Enabled, Electric heat Enabled, Baseboard heat Enabled
On Valves Enabled, Fresh air damper Enabled, Electric heat Enabled, Baseboard heat Enabled
Off Valves Disabled, Fresh air damper Disabled, Electric heat Disabled, Baseboard heat Disabled
On Valves Enabled, Fresh air damper Enabled, Electric heat Enabled
Cycling Power
When someone turns off the controller's 24 Vac power,
then re-applies power, the unit cycles through a power up
sequence. By default, the controller attempts to reset all
diagnostics at power up. Diagnostics present at power-up
and those that occur after power-up are handled according
to the defined unit diagnostics sequences (see the tables
below).
Fan Valves
Enabled No action
Off Closed
Enabled Enabled
Enabled Enabled
Disabled Disabled
Off Open
Enabled No action
Enabled No action
Off Closed
Other Outputs
2
, Electric heat Enabled
3
, Electric heat Enabled, Baseboard heat Enabled
®
ZN520 controller generates a diagnostic to indicate the sensor loss
Electric Heat Damper
No action No action
Off Closed
Enabled Enabled
Enabled Enabled
Disabled Disabled
Off Closed
No action No action
No action No action
Off Closed
1
2
, Baseboard heat Off
UNT-SVX07J-EN