CNT-SVX11A-EN 35
Troubleshooting
Diagnostic Unit Response Latching/ Reset
non-latching
Fan—off Auto reset once within 24 hrs.
Valves—closed If safety generates a diagnostic
High/Low Pressure Compressor - off Latching more than once a communicated
Cutout
2
or manual reset will be
necessary
Fan—off
Low Air Flow/ Valves—closed
Fan Failure
2
Compressors—off Latching Communicated or manual reset
Space Fan—off
Temperature Valves—closed
Failure
2,3
Compressors—off Non-latching Communicated or manual reset
Entering Fan—enabled
Water Temperature Boilerless control—disabled
Failure
2,3
Waterside Economizer—enabled Non-latching Communicated or manual reset
Discharge Air Fan—on Auto reset once within 24hrs.
Temperature Compressor—disable If safety generates a diagnostic
Limit Waterside Economizer—enabled Non-Latching more than once a communicated
or manual reset will be
necessary.
Discharge Fan—enable
Air Temperature Failure
2,3
Compressors—enabled Non-latching Communicated or manual reset
Outdoor Air Fan—enable
Temperature Compressor—enable Non-latching Communicated or manual reset
Failure
2,3
Table 19: Tracer ZN524 Unit Controller diagnostics
1: The generic binary output (TB4-1, TB4-2) state is unaffected by all unit diagnostics.
2: During manual output test, these diagnostics make the green status LED flash in a two-blink pattern. For more information see, Manual
Output Test, on page 32.
3: These diagnostics are non-latching and automatically reset when the input is present and valid.
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