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Diagnostics
Table 17: ZN510 controller diagnostics
Diagnostic Fan Other Outputs
Condensate overflow Off
Compressors: Off
Damper: Closed
Low temp detect - Crt 1 Enabled
Compressor 1: Off
Compressor 2: See note below.
Damper: See note below.
Low temp detect - Crt 1 Enabled
Compressor 1: See note below.
Compressor 2: Off
Damper: See note below.
Low temp detect - Crt 1 and 2 Off
Compressor 1: Off
Compressor 2: Off
Damper: Closed
High/low press cutout - Crt 1 Enabled
Compressor 1: Off
Compressor 2: See note below.
Damper: See note below.
High/low press cutout - Crt 2 Enabled
Compressor 1: See note below.
Compressor 2: Off
Damper: See note below.
High/low press cutout - Crt 1 and 2 Off
Compressor 1: Off
Compressor 2: Off
Damper: Closed
Space temperature failure* Off
Compressor(s): Off
Damper: Closed
Leaving water temp failure Enabled
Compressor 1: Off
Compressor 2: See note below.
Damper: See note below.
Discharge air temp failure* Enabled
Compressor(s): No action
Damper: No Action
Maintenance required
(example: Filter Status)
Enabled
Compressor(s): No action
Damper: No Action
Local setpoint failure* Enabled
Compressor(s): Enabled
Damper: Enabled
Local fan mode failure* Enabled
Compressor(s): Enabled
Damper: Enabled
Invalid unit configuration Disabled
Compressor(s): Disabled
Damper: Disabled
High/low pressure cutout and low temperature detection diagnostics for 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).
When BOP 6 is configured as a generic binary output, BOP 6’s state is unaffected by all unit diagnostics.
* Note: Non-latching diagnostics automatically reset when the input is present and valid.