Trane Tracer ZN.520 Manual page 96

If the Tracer ZN.520 zone controller is
configured for economizing, Tracer
Summit can enable or disable
economizing. If the Tracer ZN.520 zone
controller is not configured for
economizing, Tracer Summit cannot
enable economizing.
94
Troubleshooting
Translating multiple diagnostics
The controller senses and records each diagnostic independently of other
diagnostics. 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 diagnostics:
I Automatically by the controller
I By initiating a manual output test at the controller
I By cycling power to the controller
I By using a building automation system
I By using the Rover service tool
I By using any other communicating device able to access the controller's
diagnositc reset input
I By cycling the fan switch from off to any speed setting
Automatically: The Tracer ZN.520 zone controller includes an automatic
diagnostic reset function. This function attempts to automatically recover a unit
when the Low Coil Temperature Detection diagnostic occurs. When this
diagnostic occurs, the controller responds as defined in Table on page 92.
After the controller detects the Low Coil Temperature Detection diagnostic, the
unit waits 30 minutes before invoking the automatic diagnostic reset function.
The automatic diagnostic reset function clears the Low Coil Temperature
Detection diagnostic and attempts to restore the controller to normal operation.
The controller resumes normal operation until another diagnostic occurs.
If a Low Coil Temperature Detection diagnostic recurs 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: You can use the Test button on the controller either
during installation to verify proper end device operation or during
troubleshooting. When you press the Test button, the controller exercises all
outputs in a predefined sequence. The first and last steps of the sequence reset
the diagnostics. For more information see "Manual output test" on page 88.
Cycling power: When someone turns off the controller's 24 VAC power, then
re-applies power, the unit cycles through a power-up sequence. By default, the
controller attempts to reset all diagnostics at power-up. Diagnostics present at
CNT-SVX04A-EN