ZN010, ZN510, and ZN520 Controllers
140 UNT-SVX07E-EN
Building Automation System
Some building automation systems can reset diagnostics
in the Tracer ZN510 and ZN520 controllers. For more
complete information, refer to the product literature for
the building automation system.
Diagnostic Reset for Tracer ZN510 or ZN520
Controllers
Any device that can communicate the network variable
nviRequest (enumeration “clear_alarm”) can reset
diagnostics in the Tracer ZN510 or ZN520 controller. The
controller also attempts to reset diagnostics whenever
power is cycled.
Cycling the Fan Switch for Tracer ZN520
Controller
If the user cycles the fan speed switch from off to any
speed, the controller resets all diagnostics. Diagnostics
may recur immediately if the problem still exists.
The green LED normally indicates whether or not the
controller is powered on (24 Vac).
Trane Service Tools
Rover, Trane’s service tool for the controller, can reset
diagnostics present in the controller. For complete
information about Rover, refer to:
EMTX-SVX01G-EN Installation, Operation, and
Programming: Rover™ Service Tool
Alarm Reset
Any device that can communicate alarm reset information
can reset diagnostics present in the controller.
Table 79. Tracer ZN520 controller diagnostics
Diagnostic Fan Other Outputs
1
Condensate overflow Off Valves Closed, Fresh air damper Closed, Electric heat Off, Baseboard heat Off
Low temperature detection Off Valves Open, Fresh air damper Closed, Electric heat Off, Baseboard heat Off
Low air flow - fan failure Off Valves Closed, Fresh air damper Closed, Electric heat Off, Baseboard heat Off
Space temperature failure Off Valves Closed, Fresh air damper Closed, Electric heat Off, Baseboard heat Off
Entering water temp failure On Valves Enabled
1
, Fresh air damper Enabled
2
, Electric heat Enabled
2
, Baseboard heat Off
Discharge air temp low limit Off Valves Open, Fresh air damper Closed, Electric heat Off, Baseboard heat Off
Discharge air temp failure Off Valves Closed, Fresh air damper Closed, Electric heat Off, Baseboard heat Off
Fresh air temp failure On Valves Enabled, Fresh air damper Minimum position
3
, Electric heat Enabled, Baseboard heat Enabled
Relative humidity failure On Valves Enabled, Fresh air damper Enabled, Electric heat Enabled, Baseboard heat Enabled
Generic 4–20mA failure On Valves Enabled, Fresh air damper Enabled, Electric heat Enabled, Baseboard heat Enabled
CO
2
Input failure On Valves Enabled, Fresh air damper Enabled, Electric heat Enabled, Baseboard heat Enabled
Maintenance required On Valves Enabled, Fresh air damper Enabled, Electric heat Enabled, Baseboard heat Enabled
Local fan mode failure On Valves Enabled, Fresh air damper Enabled, Electric heat Enabled, Baseboard heat Enabled
Local setpoint failure On Valves Enabled, Fresh air damper Enabled, Electric heat Enabled, Baseboard heat Enabled
Invalid unit configuration Off Valves Disabled, Fresh air damper Disabled, Electric heat Disabled, Baseboard heat Disabled
Normal—power up On Valves Enabled, Fresh air damper Enabled, Electric heat Enabled
Notes:
1
The generic binary output (TB4-1, TB4-2) state is unaffected by all unit diagnostics.
2
When the entering water temperature is required but not present, the Tracer ZN520 controller generates a diagnostic to indicate the sensor loss
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.
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