Trane Tracer ZN.520 Manual page 95

CNT-SVX04A-EN
Troubleshooting
Table 60 Tracer ZN.520 zone controller diagnostics (Continued)
4
Generic AIP Failure
4
Defrosting - Cmpr Lockout
(defrosting and compressor
lockout control)
Maintenance Required
4
Local Fan Mode Failure
4
Local Setpoint Failure
Generic Temperature Failure
2
Invalid Unit Configuration
Normal
1
Note : The generic binary output (TB4-1, TB4-2) state is unaffected by all
diagnostics.
2
Note : During manual output test, these diagnostics make the green status LED light in a two-blink
pattern. Refer to "LED operation" on page 87 for more information on the two-blink pattern.
3
Note : When the entering water temperature is required but not present, the Tracer ZN.520 zone
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
hydronic cooling is locked out, but normal fan and outdoor air damper operation is permitted.
4
Note : These diagnostics are non-latching and automatically reset when the input is present and valid.
5
Note : When the outdoor air temperature sensor has failed or is not present, the Tracer ZN.520 zone
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. A value of Enable or Disable for nviEconEnable overrides these decisions, regardless of the
presence of an outdoor air temperature value or failure.
Enabled Valves Enabled
Outdoor air damper Enabled
Face bypass damper Enabled
DX/electric heat Enabled
Baseboard heat Enabled
Enabled Valves Enabled
Outdoor air damper Enabled
Face bypass damper Enabled
DX/electric heat Off
Baseboard heat Enabled
Enabled Valves Enabled
Outdoor air damper Enabled
Face bypass damper Enabled
DX/electric heat Enabled
Baseboard heat Enabled
Enabled Valves Enabled
Outdoor air damper Enabled
Face bypass damper Enabled
DX/Electric Heat Enabled
Baseboard heat Enabled
Enabled Valves Enabled
Outdoor air damper Enabled
Face bypass damper Enabled
DX/electric heat Enabled
Baseboard heat Enabled
Enabled Valves Enabled
Outdoor air damper Enabled
Face bypass damper Enabled
DX/electric heat Enabled
Baseboard heat Enabled
Disabled Valves Disabled
Outdoor air damper Disabled
Face bypass damper Disabled
DX/electric heat Disabled
Baseboard heat Disabled
Enabled Valves Enabled
Outdoor air damper Enabled
Face bypass damper Enabled
DX/electric heat Enabled
Baseboard heat Enabled
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