Analog inputs for water-source heat pump applications
CNT-SVX06B-EN 19
pressor operation. BI5 and V5 will perform the same function for the sec-
ond compressor.
Analog inputs for water-source heat
pump applications
The Tracer ZN511 zone controller includes five analog inputs. Table 4
gives the function of each input for water-source heat pump applications.
Each function is described briefly in the succeeding paragraphs. For an
explanation of the diagnostics generated by each analog input, see “Diag-
nostics” on page 62. For more information about how the controller oper-
ates, see Chapter 5, “Sequence of operations for the heat pump
configuration”.
ZN: Zone temperature
The ZN analog input functions as the local (hardwired) zone temperature
input. The controller receives the temperature as a resistance signal from
a 10 kΩ thermistor in a standard Trane zone sensor wired to analog input
ZN. A communicated zone temperature value can also be used for control-
lers operating on a BAS. When both a hardwired and communicated zone
temperature value is present, the controller uses the communicated
value. When neither a hardwired nor communicated zone temperature
value is present, the controller generates a Zone Temp Failure diagnostic.
The ZN analog input is also used to communicate timed override requests
and cancel requests to the controller for applications utilizing a Trane
zone sensor with the ON and CANCEL button option.
Table 4. Analog inputs for water-source heat pump application
Analog input
terminal label
Function
ZN Zone temperature
SET Local set point
FAN Fan mode input
AI1 Leaving water temperature
AI2 Discharge air temperature
Note:
Use a GND terminal as the common ground for all zone sensor
analog inputs. See Figure 8 on page 24.
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