Output Testing And Diagnostics (Uc400); Output Testing (Uc400); Diagnostics (Uc400) - Trane HUV Installation, Operation And Maintenance Manual

Output Testing and Diagnostics
(UC400)
This section provides information about the following:
• Output testing
• Diagnostics
Note: For detailed description of LED activities and
troubleshooting tips, refer to the section.

Output Testing (UC400)

Important: Do not directly overwrite the outputs.
Output testing can be accomplished by
overriding the following analog and
multistate value points in the desired state
or position:
• Cool valve request
• DX cool request
• Economizer request
• Electric heat request
• Heat valve request
• Supply fan speed request
The points can be overridden on the Tracer TU analog or
multistate pages by clicking on the Override icon
the control column. A higher priority (lower number) must
be chosen over the current control setting.

Diagnostics (UC400)

Diagnostics are informational messages that indicate the
operational status of the UC400 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 (UC400)
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 (UC400).
diagnostics (also referred to as latching) cause the unit to
UV-SVN02C-EN
shut down. Manual diagnostics can be cleared from the
UC400 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 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 (UC400).
Automatic diagnostics clear automatically when the
problem that generated the diagnostic is solved.
Smart Reset Diagnostics (UC400).
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 section,
"Manual (Latching) Diagnostics (UC400). "
in
Informational Diagnostics (UC400).
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.
Table of Diagnostics (UC400)
Table 37 lists each diagnostic that can be generated by the
UC400 controller, the diagnostic effect on outputs
(consequences), and diagnostic type.
Note: The generic binary output is unaffected by
diagnostics.
Table 37.
Diagnostic Probable Cause
Filter change
required
Condensate
overflow
Low coil
temp
detection
Low airflow
supply fan
failure
Manual
UC4000 diagnostics
Consequences
Fan run hours • Fan Unaffected
exceed the time set • Valves Unaffected
to indicate filter • Electric heat
change. Unaffected
The drain pan is full • Fan OFF
of water. • Valves Closed
• Outdoor air damper
Closed
• DX/electric heat OFF
The leaving fluid • Fan OFF
temperature may be • Valves Open
close to freezing. • Outdoor air damper
Closed
• DX/electric heat OFF
The fan drive belt, • Fan OFF
contactor, or motor • Valves Closed
has failed. • Outdoor air damper
Closed
• DX/electric heat OFF
Diagnostics
Smart Reset
Informational
Diagnostic
Type
Informational
Manual
Smart reset/
Manual
Manual
93