Trane Tracer ZN.520

CNT-SVX04A-EN
31
Analog inputs
Analog input summary
Table 26 Analog inputs
Note: Refer to Table 6 on page 14 for terminal identification.
Space temperature
The Tracer ZN.520 zone controller cannot
operate without either a valid hardwired or
communicated space temperature. When
either input returns to a valid value, the
controller automatically allows the unit to
resume operation.
The space temperature analog input (zone temperature) measures space
temperature only. The space temperature is measured with a 10 kΩ thermistor
included with standard Trane zone sensors. The Tracer ZN.520 zone controller
receives the space temperature from either a wired zone sensor or
communicated value.
Once a valid space temperature is established either through the hardwired
input or through communication, and when neither a local space temperature
nor communicated space temperature is present, the controller generates a
Space Temperature Failure diagnostic.
Local setpoint
The local setpoint input is the local (hardwired) setpoint input only. The local
setpoint is a resistive input for use with Trane zone sensors. If neither a
hardwired nor communicated setpoint is present, the controller uses the stored
default configured heating and cooling setpoints:
■ Occupied setpoints
■ Occupied standby setpoints
■ Unoccupied setpoints
Once a valid setpoint is established through the hardwired input and the local
setpoint is no longer present, the controller generates a Local Setpoint Failure
diagnostic.
Analog Input Description Application
Zone Space temperature Space temperature
Set Local setpoint Zone sensor thumbwheel setpoint
Fan Fan mode input Zone sensor fan switch
Analog Input 1 (AI 1) Entering water temperature Entering water temperature
Analog Input 2 (AI 2) Discharge air temperature Discharge air temperature
Analog Input 3 (AI 3) Outdoor air temperature or Generic
temperature
Outdoor air temperature or Generic temperature (thermistor)
Analog Input 4 (AI 4) Universal 4–20 mA input
General purpose 4–20 mA input, relative humidity, or CO
2
sensor