Analog Inputs; Ground Terminals; Ai1; Space Temperature; Ai2; Space Temperature Local Setpoint - Trane Tracer UC400 Installation, Operation And Maintenance Manual

when the controller has the fan controlled to ON, the controller generates a Low Primary Airflow
Diagnostic.

Analog Inputs

The UC400 Controller has seven (7) analog inputs.

Ground Terminals

Use the

AI1; Space Temperature

Space Temperature AI1 functions as the local (hard wired or wireless) space temperature input.
The UC400 Controller receives the space temperature as a resistance signal from a 10 kΩ
thermistor in a standard Trane space temperature sensor that is wired to analog input AI1. A
space temperature value communicated by means of a BACnet link, can be used for controllers
operating on a BAS. When both a hard wired and communicated space temperature value are
present, and in service, the controller uses the communicated value.
If neither a hard wired nor a communicated space temperature value is present, the space
temperature local and active points go into a fault state and generates an alarm. If neither the
hard wired or communicated space temperature are valid, the equipment will shut down.

AI2; Space Temperature Local Setpoint

Space Temperature Local Setpoint AI2 functions as the local (hard wired) space temperature
setpoint input for applications utilizing a Trane space temperature sensor with a temperature
setpoint thumbwheel or digital setpoint input. A setpoint value communicated by means of a
BACnet link, can be used for controllers operating on a BAS. If both hard wired and
communicated setpoint values are present, and in service, the UC400 Controller uses the
communicated value.
In addition, the controller can be configured to use the local (hard wired) input value instead of
the communicated value using the Tracer TU service tool. If neither a hard wired nor a
communicated setpoint value is present, the controller uses the space temperature setpoint
default analog value, which is configured using the Tracer TU service tool. If a local setpoint
value is not valid or not present, the controller generates a Space Temperature Setpoint Local
alarm.

AI3; Local Fan Mode Input

Local Fan Mode Input AI3 functions as the local (hard wired) fan mode switch input for
applications using the Trane space temperature sensor with a fan mode switch option. The
various fan mode switch positions (OFF, LOW, MEDIUM, HIGH, AUTO) provide different
resistances that are interpreted by the UC400 Controller.
N N o o t t e e : : The local fan speed switch can be disabled by taking out of service the multi-state point,
A communicated fan mode request by means of the BACnet communications link, can be used
for controllers operating on a BAS. If both hard wired and communicated fan mode values are
present and in service, the UC400 Controller uses the communicated value. However, the
controller can be configured to use the local (hard wired) input value instead of the
communicated BAS value. The supply fan speed source (local or BAS) can be selected on the
Tracer TU Setup Parameters page. If neither a hard wired nor a communicated fan mode value is
present, the controller recognizes the fan mode value as AUTO and operates according to the
default configuration. If a valid hard wired or communicated fan mode value is established, and
then is no longer present, the controller generates a Supply Fan Speed Local alarm.

AI4; Discharge Air Temperature Sensor

Discharge Air Temperature Sensor AI4 functions as the local discharge air temperature input.
The UC400 Controller receives the temperature as a resistance signal from a 10 kΩ thermistor
wired to analog input AI4. The thermistor is typically located downstream from all unit heating
BAS-SVX065E-EN
terminal as the common ground for all space temperature sensor analog inputs.
supply fan speed local and setting the value for each to AUTO.
T T y y p p i i c c a a l l A A p p p p l l i i c c a a t t i i o o n n s s a a n n d d T T e e r r m m i i n n a a t t i i o o n n s s
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