Trane BCXC-SVX01B-EN Tracer ZN010 and ZN510 controller diagnostics, Tracer ZN520 diagnostics

Diagnostics

Table 41. Tracer ZN010 and ZN510 controller diagnostics

Diagnostic	Latching	Fan	Valves	Electric heat	Damper
Auxiliary temperature failure	No	Enabled	No action	No action	No action
Condensate overflow detection	Yes	Off	Closed	Off	Closed
Entering water temperature	No	Enabled	Enabled	Enabled	Enabled
Fan mode failure	No	Enabled	Enabled	Enabled	Enabled
Invalid unit configuration failure	Yes	Disabled	Disabled	Disabled	Disabled
Low temperature 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 temperature 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.

Table 42. Tracer ZN520 diagnostics

Diagnostic	Fan	Other outputs(a)
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 temperature failure	On	Valves enabled(b), fresh air damper enabled(b), electric heat enabled(b), baseboard heat off
Discharge air temperature low limit	Off	Valves open, fresh air damper closed, electric heat off, baseboard heat off
Discharge air temperature failure	Off	Valves closed, fresh air damper closed, electric heat off, baseboard heat off
Fresh air temperature failure	On	Valves enabled, fresh air damper minimum position(c), 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
CO2 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

(a)The generic binary output (TB4-1, TB4-2) state is unaffected by all unit diagnostics.

(b)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.

(c)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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