Servicing And Testing Wzs - Trane VUV Installation, Operation And Maintenance Manual

Diagnostics and Troubleshooting

Servicing and Testing WZS

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 and signal strength
Signal Strength," p. 99
p. 100) are indicated on the display.
Table 44. 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.
102
("Testing
and "Testing Battery Status,"
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
Modes," p. 102).
3. Measure the receiver output resistance (see
Output Resistance," p.
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
p. 99.
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.
Heating setpoint
Zone setpoint output
451 Ω, 72.5°F (22.5°C), 501 Ω, 70.5°F (21.4°C),
indefinitely
451 Ω, 72.5°F (22.5°C),
501 Ω, 70.5°F (21.4°C),
Hold for 15 minutes, then
open
Open
Open
Normal value Normal value
Open
"Failure and Default
"Measuring
103).
"Testing Signal Strength,"
output Fan/System output
2320 Ω
Fan = Auto
indefinitely
System = Off
2320 Ω
Fan = Auto
indefinitely
System = Off
Open Open
Open Open
n/a
Open n/a
UV-SVX005G-EN