Trane UniTrane Installation Operation & Maintenance page 79

Diagnostics
®
Table 30. Tracer ZN.520 Diagnostics
Diagnostic
Condensate overflow
Low temperature detection
Low air flow - fan failure
Space temperature failure
Entering water temp failure
Discharge air temp low limit
Discharge air temp failure
Fresh air temp failure
Relative humidity failure
Generic 4-20ma failure
CO Input failure
2
Maintenance required
Local fan mode failure
Local setpoint failure
Invalid unit configuration
Normal – power up
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
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.
UNT-IOM-6
Fan Other Outputs (Note 1)
Off Valves Closed, Fresh air damper Closed, electric heat Off,
Baseboard heat Off
Off Valves Open, Fresh air damper Closed, electric heat Off,
Baseboard heat Off
Off Valves Closed, Fresh air damper Closed, electric heat Off,
Baseboard heat Off
Off Valves Closed, Fresh air damper Closed, electric heat Off,
Baseboard heat Off
On Valves Enabled (Note 2), Fresh air damper
Enabled (Note 2), electric heat Enabled (Note 2), Baseboard
heat Off
Off Valves Open, Fresh air damper Closed, electric heat Off,
Baseboard heat Off
Off Valves Closed, Fresh air damper Closed, electric heat Off,
Baseboard heat Off,
On Valves Enabled, Fresh air damper Minimum position
heat Enabled, Baseboard heat Enabled
On Valves Enabled, Fresh air damper Enabled, electric heat
Enabled, Baseboard heat Enabled
On Valves Enabled, Fresh air damper Enabled, electric heat
Enabled, Baseboard heat Enabled
On Valves Enabled, Fresh air damper Enabled, electric heat
Enabled, Baseboard heat Enabled
On Valves Enabled, Fresh air damper Enabled, electric heat
Enabled, Baseboard heat Enabled
On Valves Enabled, Fresh air damper Enabled, Electric Heat
Enabled, Baseboard heat Enabled
On Valves Enabled, Fresh air damper Enabled, electric heat
Enabled, Baseboard heat Enabled
Off Valves Disabled, Fresh air damper Disabled, electric heat
Disabled, Baseboard heat Disabled
On Valves Enabled, Fresh air damper Enabled, Electric heat
Enabled
®
Tracer ZN.520
3
, electric
® ZN.520 controller
79