Installation and Maintenance Manual

Diagnostics
122 UNT-SVX07D-EN
given in Table 53, p. 122.
Note: The output circuits are not electrically
powered; consequently, resistance can be
measured without risk of damage to the
volt-ohm meter.
Cleaning the Sensor (Wireless Controls)
You can clean the sensor by applying glass cleaner to a
soft, non-abrasive cloth, and gently wiping the face,
including the buttons and LCD display. Use of a pre-
moistened towelette designed for lens or screen cleaning
is also acceptable.
Avoid inadvertent pressing of the Occupied/Unoccupied
buttons on the keypad on the WDS sensor as this may
result in an unwanted timed override or settings change.
Troubleshooting (Tracer ZN520)
Red SERVICE LED (Tracer ZN520)
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 (Tracer ZN520)
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.
Table 52. Receiver resistance table for all models
(wireless controls)
Zone or setpoint
temperature
Nominal zone
temperature output
resistance
Nominal setpoint
and heating
setpoint output
resistance
55°F (12.8°C) 17.47 kΩ 792 Ω
60°F (15.6°C) 15.3 kΩ 695 Ω
65°F (18.3°C) 13.49 kΩ 597 Ω
70°F (21.1°C) 11.9 kΩ 500 Ω
75°F (23.9°C) 10.5 kΩ 403 Ω
80°F (26.7°C 9.3 kΩ 305 Ω
85°F (29.4°C) 8.25 kΩ 208 Ω
Table 53. Receiver resistance table for model WDS
(wireless controls)
Fan command Nominal output resistance
High 16,130 Ω
Med 13,320 Ω
Low 10,770 Ω
Auto 2320 Ω
Off 4870 Ω
NOTICE:
Equipment Damage!
Spraying glass cleaner or any other solution directly on
the sensor may damage it.
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
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UNT-SVX07_-EN.book Page 122 Friday, April 27, 2012 9:40 AM