Trane Tracer ZN524, Installation Owner Diagnostics

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CNT-SVX11A-EN 37
Troubleshooting
Translating Multiple
Diagnostics
The controller senses and records each
diagnostic independently of other diag-
nostics. It is possible to have multiple
diagnostics present simultaneously. The
diagnostics are reported in the order
they occur.
Resetting Diagnostics
There are many ways to reset unit diag-
nostics:
• Automatically by the controller
• By initiating a manual output test at
the controller
• By cycling power to the controller
• By using a building automation
system
• By using the Rover service tool
• By cycling the fan switch from off to
ON
or
AUTO
High/Low Pressure Cutout
The Tracer™ ZN524 Unit Controller
includes an automatic diagnostic reset
function. This function attempts to auto-
matically recover a unit when the
High/Low Pressure Cutout diagnostic
occurs. When this diagnostic occurs,
the controller responds as defined in
Table 19: Tracer™ ZN524 Unit Controller
diagnostics.
After the controller detects the
High/Low Pressure Cutout diagnostic,
the unit waits 30 minutes before invok-
ing the automatic diagnostic reset func-
tion. The automatic diagnostic reset
function clears the High/Low Pressure
Cutout diagnostic and attempts to
restore the controller to normal opera-
tion. The controller resumes normal
operation until another diagnostic
occurs.
If a High/Low Pressure Cutout diagnos-
tic reoccurs within 24 hours after an
automatic diagnostic reset, you must
manually reset the diagnostic. See
other possible methods for resetting
diagnostics in this section.
Manual output test
The test button on the controller may
be used either during installation to
verify proper end device operation or
during troubleshooting.
When the Test button is pressed, the
controller exercises all outputs in a pre-
defined sequence. The first and last
steps of the sequence reset the con-
troller diagnostics. (See “Manual
Output Test” on page 32 for more infor-
mation.)
Cycling power
When turned-off, the controller's 24
VAC power, and power is reapplied, the
unit cycles through a power-up
sequence and clears all timers.
By default, the controller attempts to
reset all diagnostics at power-up.
Diagnostics present at power-up and
those that occur after power-up are
handled according to the defined unit
diagnostics sequences (For more infor-
mation see,Table 19).
Building automation system
Some building automation systems
(i.e., Tracer Summit, Tracker or Tracer
Loop Controller building automation
system) can reset diagnostics in the
Tracer ZN524 unit controller. For more
complete information, refer to the prod-
uct literature for the building automa-
tion system.
Rover service tool
Rover service tool can reset diagnostics
in the Tracer ZN524 unit controller. For
more complete information, refer to the
Rover Installation, Operation, and
Programming manual.
Diagnostic reset
Any device that can communicate the
network variable nviRequest (enumera-
tion “clear_alarm”) can reset diagnos-
tics in the Tracer ZN524 unit controller.
The controller also attempts to reset
diagnostics whenever power is cycled.
Cycling the fan switch
If the user cycles the fan speed switch
from off to
ON
or
AUTO
, the controller
resets all diagnostics. Diagnostics may
recur immediately if the problem still
exists.