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Chapter 8 Status indicators for operation and communication
Table 18. Diagnostics for heat pump configurations
Diagnostic
Maintenance Required
Condensate Overflow
Low Temp Detection
Circuit 1
Low Temp Detection
Circuit 2
Low Temp Detection
Circuits 1 and 2
High/Low Pressure Cutout
Circuit 1
High/low Pressure Cutout
Circuit 2
1 For more information on types of diagnostics and how they are cleared from the controller, see "Clearing diagnostics"
on page 66.
2 High/low pressure cutout and low temperature detection diagnostics for water-source heat pump configurations isolate
each circuit and independently disable compressor operation. For single compressor units, these diagnostics cause the
compressor to shut down, the unit fan to be controlled off, and the outdoor air damper to be closed (when present).
62
Diagnostics
In response to a diagnostic, the controller attempts to protect the equip-
ment by activating or de-activating, or opening or closing, certain outputs.
Table 18 on page 62 and Table 19 on page 64 list diagnostics that can
occur with the Tracer ZN511 controller. The tables present each diagnos-
tic that can be generated, its effect on outputs (consequences), and its
type (categorized according to clearing method).
Note:
The generic binary output is unaffected by diagnostics.
Probable cause
Fan run hours exceed the
time set to indicate filter
change
The drain pan is full of
water
The leaving fluid tempera-
ture is close to freezing
The leaving fluid tempera-
ture is close to freezing
The leaving fluid tempera-
ture is close to freezing
Abnormal refrigerant pres-
sures
Abnormal refrigerant pres-
sures
Consequences
Fan unaffected
Valves unaffected
Electric heat unaffected
Damper unaffected
Fan off
Valves closed
Electric heat off
Compressors off
Damper closed
2
Fan unaffected
Compressor 1 off
2
Compressor 2
2
Damper
2
Fan unaffected
2
Compressor 1
Compressor 2 off
2
Damper
Fan off
Compressor 1 off
Compressor 2 off
Damper closed
2
Fan unaffected
Compressor 1 off
2
Compressor 2
2
Damper
Fan unaffected
2
Compressor 1
Compressor 2 off
2
Damper
Diagnostic
1
type
Informational
Manual
Smart reset/
Manual
Smart reset/
Manual
Smart reset/
Manual
Smart reset/
Manual
Smart reset/
Manual
CNT-SVX06B-EN
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