Trane Tracer VV550 User Manual

CNT-SVX17G-EN 27
Sequence of Operations
ix.Communicated source temperature;
x.Communicated field override;
xi.Communicated valve override.
7. Normal operation begins (assume modulating valv
es/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
contr
o
ller and returns the controller to normal operation, if normal operation is possible.
Table 17 and Table 18 show the supported emergency override requests for control
modes.
Table 17.Space temperature and ventilation flow controller emergency override
ope
ration
Communicated
emergency override
No heartbeat Fan
Reheat
output
Air valve
Normal or not valid
a
Normal Normal Normal
Pressurize Series On;
Para
llel Off
Off Open
a
Depressurize All Off Off Closed
Purge Series On;
Para
llel Off
Off Open
a
Shutdown Off Off Closed
Fire Off Off Closed
a. Open to configured maximum airflow setpoint.

Trane Tracer VV550 Specifications

General

Brand	Trane
Model	Tracer VV550
Category	Controller
Language	English