Trane Troubleshooting Uni Fan Coil and ZN520 for Optimal Performance

Maintenance troubleshooting

Troubleshooting Tracer ZN010, ZN510 & ZN520

Green STATUS LED

indicates whether the controller is powered on (24 VAC supplied)

Yellow COMM LED

indicates if communication is functioning

Red SERVICE LED

indicates is service is needed

Figure M-T-1. The Tracer ZN010 board

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.

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.

If the LED is off, either the power is off, an abnormal condition is present or the TEST button is pressed.

Yellow COMM LED

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:

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