Trane VUV Installation, Operation And Maintenance Manual page 110

Diagnostics and Troubleshooting
Overriding Outputs
Analog and multistate value request points are included in
order to safely override outputs without disrupting TGP2
program operation. To override valves and dampers for
commissioning or testing purposes, access the following
points on the Tracer® TU analog or multistate status pages:
• Cool valve request
• DX cool request
• Heat valve request
• Electric heat request
• Economizer request
• Supply fan speed active
For more information, refer to:
• BAS-SVX48*-EN: Tracer® UC400/UC400-B
Programmable Controllers for Blower Coil, Fan Coil, and
Unit Ventilator Installation, Operation, and Maintenance
• BAS-SVX093*-EN: Symbio™ 400-B/500 Programmable
Controllers For Blower Coil, Fan Coil, and Unit Ventilator
Installation, Operation, and Maintenance
Diagnostics
Diagnostics are informational messages that indicate the
operational status of the controller. In response to most
diagnostics, the controller attempts to protect the equipment
by enabling/disabling, or by opening/closing specific outputs.
Other diagnostics provide information about the status of the
controller, but have no effect on outputs. Diagnostics are
reported in the order in which they occur. Multiple diagnostics
can be present simultaneously. Diagnostic messages are
viewed using the Tracer® TU service tool or through a BAS.
Note: Tracer® TU will report only active diagnostics.
Diagnostics Types
Diagnostics are categorized according to the type of clearing
method each uses and the type of information each provides.
The diagnostic types are:
• Manual (latching) diagnostics
• Automatic (non-latching) diagnostics
• Smart reset diagnostics
• Informational diagnostics
Note: Clearing diagnostics refers to deleting diagnostics
from the software; it does not affect the problem that
generated the message.
Manual (Latching) Diagnostics
Manual diagnostics (also referred to as latching) cause the unit
to shutdown. Manual diagnostics can be cleared from the
UC400-B/Symbio™ 400-B controller in one of the following
ways:
• By using the Tracer® TU service tool to reset latching
diagnostics on the Alarms Status tab or by temporarily
110
overriding the Reset Diagnostic Request (bv/2) on the
Binary Status tab.
• Through a building automation system.
• By cycling power to the controller. When the 24Vac power
to the controller is cycled OFF and then ON again, a power-
up sequence occurs.
Automatic (Non-latching) Diagnostics
Automatic diagnostics clear automatically when the problem
that generated the diagnostic is solved.
Smart Reset Diagnostics
Smart Reset Diagnostics are latching diagnostics that will
auto-recover if the condition is corrected. After the controller
detects the first smart reset diagnostic, the unit waits
30 minutes before initiating the smart reset function. If another
diagnostic of this type occurs again within 24 hours after an
automatic clearing, clear the diagnostic manually by using any
of the ways listed under the preceding
(Latching) Diagnostics," p.
Informational Diagnostics
Informational diagnostics provide information about the status
of the controller. They do not affect machine operation, but can
be cleared from the controller using the BAS or Tracer® SC.
Building Automation System
Some building automation systems can reset diagnostics in
the controller. For more complete information, refer to the
product literature for the building automation system.
Trane Service Tools
Tracer® TU can be used to reset diagnostics present in a
UC400-B/Symbio™ 400-B controller.
Controller Diagnostics
Table 60, p. 111 lists each diagnostic that can be generated by
the UC400-B/Symbio™ 400-B controller, the diagnostic effect
on outputs (consequences), and diagnostic type.
Note: The generic binary output is unaffected by diagnostics.
section,"Manual
110.
UV-SVX005G-EN