Manufacturing Test; Unit Shutdown; Emergency Override - Trane Tracer VV550 Installation, Operation And Maintenance Manual

7. Normal operation begins (assume modulating valves/valve are closed at power up).
8. Calibration occurs if auto calibration is enabled.
9. Normal operation resumes.

Manufacturing Test

Manufacturing test is the sequence the controller uses when factory testing is being
conducted. This sequence is not for field use.

Unit Shutdown

The unit shutdown sequence follows the generation of either the invalid unit
configuration diagnostic or the controller failure diagnostic. The controller is still
communicating: the green status LED is ON and the Red status LED is OFF.

Emergency Override

The communicated emergency override request enables the controller to start driving
the outputs within five seconds of its receipt. The actuators are driven as quickly as
possible to the correct position. All the control inputs are ignored and the associated
sequences are not run during emergency override.
A reset or receipt of a communicated emergency override normal request resets the
controller and returns the controller to normal operation, if normal operation is possible.
Table 17
modes.
Table 17.Space temperature and ventilation flow controller emergency override
Communicated
emergency override
No heartbeat
Normal or not valid
Pressurize
Depressurize
Purge
Shutdown
Fire
a. Open to configured maximum airflow setpoint.
CNT-SVX17G-EN
ix.Communicated source temperature;
x.Communicated field override;
xi.Communicated valve override.
and Table 18 show the supported emergency override requests for control
operation
Fan
a
Normal
Series On;
Parallel Off
All Off
Series On;
Parallel Off
Off
Off
Sequence of Operations
Reheat
output Air valve
Normal Normal
a
Off Open
Off Closed
a
Off Open
Off Closed
Off Closed
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