Trane Tracer ZN.520 Manual page 37

Analog inputs
Generic 4–20 mA input
When configured as a generic input, the input can be used in a variety of
applications using Tracer Summit only. This input has no effect on the
operation of the controller. After a valid value has been detected and is no
longer valid, the controller generates a Generic AIP Failure informational
diagnostic.
Relative humidity input
When configured as an relative humidity input and when a valid relative
humidity value exists (either hardwired or communicated), the controller can
use this value to support the dehumidification function.
If both the hardwired and communicated relative humidity values are present,
the controller uses the communicated value for control decisions. Once a
relative humidity value is established (either hardwired or communicated), the
controller generates a Humidity Input Failure diagnostic if the signal is no
longer valid, and disables dehumidification.
CO
2
When configured to measure CO , the input can be used in a variety of
2
applications using Tracer Summit. This input has no effect on the operation of
the controller. After a valid value has been detected and is no longer valid, the
controller generates a CO Sensor Failure informational diagnostic.
2
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