Space Setpoint Analog Input - Trane Tracer VV550 Installation, Operation And Maintenance Manual

Inputs and Outputs
Table 8. Controller operation with no space temperature analog input
Failure type Control type
Space temperature Space
either: temperature
control
• Open (after normal
on reset);
• Short (anytime for
25 seconds).
Ventilation flow
control
Flow tracking
This sequence is ignored by and can be overridden by the following seven sequences
listed in priority from highest to lowest. For more information on control sequence
descriptions, refer to
1. Power-Up/reset sequence (highest priority)
2. Manufacturing test
3. Unit shutdown
4. Emergency override
5. Manual output test
6. Auto commission
7. Water valve override

Space Setpoint Analog Input

The controller can operate without a valid space setpoint input value (either hardwired
or communicated).
The local setpoint input (SET) is designed as the local (hardwired) setpoint input. You
cannot use the input for other functions. The local setpoint is a resistive input intended
for use with Trane zone sensors.
The controller generates a setpoint failure diagnostic when a valid setpoint is established
(through the hardwired input or through communications) and neither the local setpoint
nor the communicated setpoint is present. When a setpoint failure diagnostic occurs, the
controller operates using the configured heating and cooling setpoints. The heating and
cooling setpoints are factory configured, but can be changed with the Rover
tool.
The local hardwired setpoint is available on the communications network. The effective
setpoint used by the controller is available on the communications network.
14
Unit Air valve
operation operation
Space Occupied:
temperature configured
failure; space minimum airflow
temperature
Unoccupied: closed
failure
diagnostic
Normal Normal
operation;
space
temperature
failure
diagnostic
Normal Normal
operation;
space
temperature
failure
diagnostic
"Control Sequences," p.
Fan Reheat operation
operation
Series fan Off
enabled;
parallel fan
Off
Do not care Normal
Do not care Do not care
8.
™
service
CNT-SVX17G-EN