Troubleshooting (Tracer Zn520); Manual Output Test Procedure (Tracer Zn520) - Trane HUV Installation, Operation And Maintenance Manual

Diagnostics

Troubleshooting (Tracer ZN520)

2
3
1. Green STATUS LED
Indicates Whether the Controller is Powered On (24 Vac Supplied)
2. Yellow COMM LED
Indicates if Communication is Functioning
3. Red SERVICE LED
Indicates if Service is Needed
(Tracer ZN520)
Red SERVICE LED
During normal operation, the LED is off continuously when
power is applied to the controller.
If the LED is on continuously, even when power is applied
to the controller means that someone is pressing the
SERVICE button or that the controller has failed.
If the LED flashes once every second, use Rover, Trane's
service tool, to restore the unit to normal operation. Refer
to the Rover product literature for more information.
Note: If the Service button is held down for more than
15 seconds on the Tracer ZN520 controller, it will
uninstall itself from the ICS communication
network and shut down all unit operation.
(Tracer ZN520)
Green STATUS LED
During normal operation, the LED is on continuously.
If the LED blinks once, the controller is in Manual output
test mode.
If the LED blinks twice the controller is in Manual output
test mode, with one or more diagnostics present.
If the LED blinks (1/4 second on, 1/4 second off for 10
seconds) the controller is in the "Wink" mode.
Note: The "wink" feature allows the identification of a
particular controller. When sending a request from
a device, such as Rover, the controller will "wink" to
indicate it received the signal.
100
If the LED is off, either the power is off, an abnormal
condition is present or the TEST button is pressed.
Yellow COMM LED
1
If the LED is off continuously, the controller is not detecting
any communication. This is normal for units in standalone
applications.
If the LED blinks, the controller detects communication.
If the LED is on continuously, this indicates an abnormal
condition.
Manual Output Test
The purpose of the manual output test sequence is to
verify output and end device operation. Use the manual
output test to:
• Verify output wiring and operation without using
Rover, service tool
• Force the water valve to open and balance the hydronic
system
Note: The manual output test is not an automatic cycle.
You must press the TEST button to proceed
through each step.
The controller observes all diagnostics that occur during
the test sequence. Although an automatic diagnostic reset
sequence exists as part of the controller's normal
operation, the automatic diagnostic reset feature is not
active during the test sequence.
If left in an individual test step, the controller remains in
test mode for 60 minutes and then exits to normal
operation.
Many service calls are due to unit diagnostics. The test
sequence resets unit diagnostics and attempts to restore
normal unit operation prior to testing the outputs. If the
diagnostics remain after a reset, the STATUS LED indicates
the diagnostic condition is still present (two blinks).
Manual Output Test Procedure
ZN520)
Follow the procedure below to test Tracer ZN520
controllers.
1. Press and hold the TEST button for at least two
seconds (not exceeding 5 seconds), and then release,
to start the test mode.
2. The test sequence will turn off all outputs and then
attempt to clear all diagnostics.
3. Press the TEST button several more times (no more
than once per second) to advance through the test
sequence.
The outputs are not subject to minimum times during the
test sequence. However, the test sequence only permits
one step per second which limits minimum output time.
The green LED is turned off when the TEST button is
pressed. To begin the manual output test mode, press and
hold the TEST button (turning off the green LED) for at least
(Tracer ZN520)
(Tracer ZN520)
(Tracer
UV-SVN02C-EN