UNT-SVX07B-EN 109
Diagnostics
Using Trane’s Service Tool, Rover™
Rover™, Trane’s service tool, can reset diagnostics present in the controller and troubleshoot the
unit. For more information, refer to the Trane publication EMTX-SVX01G-EN (Rover Service Tool:
Installation, Operation, and Programming Guide).
Diagnostic Reset
Any device that can communicate the network variable nviRequest (enumeration “clear_alarm”)
can reset diagnostics in the Tracer ZN520 controller.The controller also attempts to reset
diagnostics whenever power is cycled.
Cycling the Fan Switch
Cycle the fan speed switch from Off to any speed and the controller resets all diagnostics.
Diagnostics may recur immediately if the problem still exists.
Table 31. Tracer ZN510 controller diagnostics
Diagnostic Latching? Fan Valves Elec Heat Damper
Auxiliary temp. failure No Enabled No action No action No action
Condensate overflow detection Yes Off Closed Off Closed
Entering water temp. failure No Enabled Enabled Enabled Enabled
Fan mode failure No Enabled Enabled Enabled Enabled
Invalid unit configuration failure Yes Disabled Disabled Disabled Disabled
Low temp. detection Yes Off Open Off Closed
Maintenance required Yes Enabled No action No action No action
Setpoint No Enabled No action No action No action
Zone temp. failure No Off Closed Off Closed
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.
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