Tracer® ZN.520

Diagnostics

Table 30. Tracer® ZN.520 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

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 (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 position3, 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

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® ZN.520 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.

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Trane LO manual Tracer ZN.520 Diagnostics Fan Other Outputs Note

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