Trane BCHC - Tracer ZN010 and ZN510 Controller Diagnostics; Tracer ZN520 Diagnostics

52 BCXC-SVX01A-EN
Maintenance Diagnostics
Table M-D-2. Tracer ZN520 Diagnostics
Diagnostic Fan Other Outputs (Note 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 Of Valves closed, fresh air damper closed, electric heat off, baseboard heat off
Space temperature failure Of Valves closed, fresh air damper closed, electric heat off, baseboard heat off
Entering water temp failure On Valves enabled (Note 2), fresh air damper enabled (Note 2), electric heat enabled (Note 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
Note 1: The generic binary output (TB4-1, TB4-2) state is unaffected by all unit diagnostics.
Note 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.
Note 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.
Table M-D-1. Tracer ZN010 and ZN510 Controller Diagnostics
Diagnostic Latching Fan Valves Elect. Heat Damper
Auxiliary no enabled no action no action no action
temp. failure
Condensate yes off closed off closed
overflow detection
Entering no enabled enabled enabled enabled
water temp.
Fan mode no enabled enabled enabled enabled
failure
Invalid unit yes disabled disabled disabled disabled
configuration
failure
Low temp. yes off open off closed
detection
Maintenance yes enabled no action no action no action
required
Setpoint no enabled no action no action no action
Zone temp. no off closed off closed
failure
Notes:
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.
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.
Enabled: End device is allowed to run if there is a call for it to run.
Disabled: End device is not allowed to run even if there is a call for it to run.
No Action: The diagnostic has no affect on the end device.