Servicing/Testing Wireless Zone Sensors - Trane UniTrane Installation, Operation And Maintenance Manual

Diagnostics and Troubleshooting
Servicing/Testing Wireless Zone
Sensors
If the wireless sensor system is not working as expected,
use the tools and procedure described in this section.
Servicing and Testing Tools
No special tools or software are necessary to service and
test the wireless sensor system. Test the system by using:
• The LEDs on the receiver, LEDs on the model WZS
sensor, and the display on the model WDS sensor
• The Test button on the sensor
• The address test mode on the receiver
• A common volt-ohm meter
Procedure for Testing Zone Sensor
If the wireless zone sensor is not working as expected:
1. Observe LED5 on the receiver. LED5 is On solid green
whenever the receiver is powered.
2. Verify that the receiver is properly grounded. Both the
GND-SIGNAL (black) wire and the GND-POWER
(yellow) wire must be grounded.
3. Press the Test button on the sensor.
• Model WZS: LED5 should turn On solid green,
indicating proper battery strength. LED1, LED2, and
LED3 will indicate signal strength.
Note: When checking signal strength, both LED1
and LED3 on the receiver and sensor
illuminate in unison if the sensor and
receiver are associated. Use this feature to
confirm association.
• Model WDS: Battery life
page 134) and signal strength
Strength, " page 133) are indicated on the display.
Table 69. Output values - failure and default modes of operation
Situation
Receiver address = 000
Receiver address = 001 to 999 and:
Receiver is powered up, but not is associated, or
Receiver has received a disassociation request
from the associated sensor.
Receiver address = 001 to 999 and receiver has not
received a communication within 35 minutes from
the associated sensor.
Receiver has no power.
Thermistor in sensor has failed to either open or
close.
Setpoint potentiometer has failed to either open or
close.
136
("Testing Battery Status, "
("Testing Signal
Zone temperature
output
11.17 kΩ, 72.5°F
(22.5°C), indefinitely
11.17 kΩ, 72.5°F
(22.5°C) Hold for 15
minutes, then open
Open
Open
Open
Normal value
Procedure for Testing Receiver
If the receiver is not working as expected:
1. Verify that the receiver is powered.
2. Set the receiver address to 000 to force the zone
temperature output and zone temperature setpoint
output to their default mode values (see
Default Modes").
3. Measure the receiver output resistance (see
"Measuring Output Resistance").
4. When the test is complete, reset the receiver address to
its previous setting.
5. Press the Test button on the sensor to force re-
association.
6. Confirm association and communication by noting
LED1, LED2, and LED3 as described in
Strength, " page 133.
Forcing a Sensor to Transmit
To force a wireless sensor to transmit during servicing,
press the Test button on the sensor.
Output Power Level
The maximum output power level of a wireless sensor set
is controlled by software and restricted by channel of
operation and agency requirements per country or region.
The sensor has a default maximum power level of 10 mW,
but the receiver determines the ultimate output power
level of the sensor.
Failure and Default Modes
The following table provides output values for failure and
default modes of operation, which can be used for
troubleshooting.
Zone setpoint Heating setpoint
output output
451 Ω, 72.5°F 501 Ω, 70.5°F
(22.5°C), indefinitely (21.4°C), indefinitely
451 Ω, 72.5°F
(22.5°C), 501 Ω, 70.5°F
Hold for 15 minutes, (21.4°C), indefinitely
then open
Open
Open
Normal value Normal value
Open
"Failure and
"Testing Signal
Fan/System
output
2320 Ω
Fan = Auto
System = Off
2320 Ω
Fan = Auto
System = Off
Open Open
Open Open
n/a
Open n/a
UNT-SVX07J-EN