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UV-SVP01A-EN 52
Troubleshooting
Diagnostics
Table 28: Tracer™ ZN.520 Unit Controller diagnostics
Diagnostic Unit Response
Latching/non-
latching
Reset
Low Coil Temperature
Detect
2
Fan—
OFF
Valves—OPEN
Outdoor air damper—CLOSED
Face bypass damper—BYPASS
DX/electric heat—OFF
Baseboard heat—OFF
Latching
Auto reset once within 24hrs. If
safety generates a diagnostic
more than once a communi-
cated or manual reset will be
necessary.
Low Air Flow - Fan Failure
2
Fan—
OFF
Valves—CLOSED
Outdoor air damper—CLOSED
Face bypass damper—BYPASS
DX/electric heat—OFF
Baseboard heat—OFF
Latching Communicated or manual reset
Space Temperature
Failure
2,4
Fan—
OFF
Valves—CLOSED
Outdoor air damper—CLOSED
Face bypass damper—BYPASS
DX/electric heat—OFF
Baseboard heat—OFF
Non-latching Communicated or manual reset
Entering Water Temp
Failure
4
Fan—
ENABLED
Valves—ENABLED
3
Outdoor air damper—ENABLED
3
Face bypass damper—ENABLED
3
DX/electric heat—ENABLED
3
Baseboard heat—OFF
Non-latching Communicated or manual reset
Discharge Air Temp Limit
2
Fan—
OFF
Valves—OPEN
Outdoor air damper—CLOSED
Face bypass damper—BYPASS
DX/electric heat—OFF
Baseboard heat—OFF
Latching
Auto reset once within 24hrs. If
safety generates a diagnostic
more than once a communi-
cated or manual reset will be
necessary.
Discharge Air Temp
Failure
2,4
Fan—
OFF
Valves—CLOSED
Outdoor air damper—CLOSED
Face bypass damper—BYPASS
DX/electric heat—OFF
Baseboard heat—OFF
Non-latching Communicated or manual reset
Outdoor Air Temp Failure
4
Fan—
ENABLED
Valves—ENABLED
Outdoor air damper—MINIMUM
POSITION
5
Face bypass damper—ENABLED
DX/electric heat—ENABLED
Baseboard heat—ENABLED
Non-latching Communicated or manual reset