Installation and Maintenance Manual

Diagnostics
UNT-SVX07D-EN 121
• The Test button on the sensor
• The address test mode on the receiver
• A common volt-ohm meter
Procedure for Testing the Wireless Sensor System
(Wireless Controls)
If the wireless sensor system 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 pro
perly grounded. Both the
GND-SIGNAL (black) wire and the GND-POWER
(yellow) wire must be grounded.
3. Press the Test button on the sensor.
• Mo
del 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 (“Testing Battery Status
(Wireless Controls),” p. 118) and signal strength
(“Testing Signal Strength (Wireless Controls),”
p. 118) are indicated on the display.
Procedure for Testing the Receiver (Wireless
Controls)
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
temp
erature output and zone temperature setpoint
output to their default mode values (see “Output
Values—Failure and Default Modes of Operation
(Wireless Controls),” p. 121).
3. Measure the receiver output
resistance (see
“Measuring Output Resistance (Wireless Controls),”
p. 121).
4. When the test is complete, re
set the receiver address to
its previous setting.
5. Press the Test button on t
he sensor to force re-
association.
6. Confirm association and communication by noting
LED1, LED
2, and LED3 as described in “Testing Signal
Strength (Wireless Controls),” p. 11 8 .
Forcing a Sensor to Transmit (Wireless Controls)
To force a wireless sensor to transmit during servicing,
press the Test button on the sensor.
Output Power Level (Wireless Controls)
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.
Output Values—Failure and Default Modes of
Operation (Wireless Controls)
The following table provides output values for failure and
default modes of operation, which can be used for
troubleshooting.
Measuring Output Resistance (Wireless
Controls)
To measure the resistance of receiver outputs for zone
temperature and setpoints for all models, and heating
setpoint and fan/system for the WDS:
1. Ensure that the GND-SIGNAL (black) wire and the
GND-POWER (yellow) wire are grounded to the
transformer.
2. Disconnect the ZONE (white) and SETPOINT (RED)
wires from t
he controller. Disconnect the HEAT
SETPOINT (brown) and FAN/SYSTEM (green) wires
from the controller, if applicable.
3. Measure resistance as follows:
a. All models: Measure between the grounded GND-
SIGNAL (blac
k) wire and either the SETPOINT (red)
or ZONE (white) wire. Compare resistance
measurements to those in Table 52, p. 122.
b. WDS only: Measure between the grounded GND-
SIGNAL (black) wire and the FAN/SYSTEM (green)
wire. Compare resistance measurements to those
Table 51. Output values
Situation
Zone
temperature
output
Zone
setpoint
output
Heating
setpoint
output
Fan/
System
output
Receiver address = 000 11.17 kΩ,
72.5°F
(22.5°C),
indefinitely
451 Ω,
72.5°F
(22.5°C),
indefinitely
501 Ω,
70.5°F
(21.4°C),
indefinitely
2320 Ω
Fan =
Auto
System
= Off
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.
11.17 kΩ,
72.5°F
(22.5°C) Hold
for 15 minutes,
then open
451 Ω,
72.5°F
(22.5°C),
Hold for 15
minutes,
then open
501 Ω,
70.5°F
(21.4°C),
indefinitely
2320 Ω
Fan =
Auto
System
= Off
Receiver address = 001
to 999 and receiver has
not received a
communication within
35 minutes from the
associated sensor.
Open Open Open Open
Receiver has no power. Open Open Open Open
Thermistor in sensor
has failed to either open
or close.
Open Normal
value
Normal
value
N/A
Setpoint potentiometer
has failed to either open
or close.
Normal value Open Open N/A
UNT-SVX07_-EN.book Page 121 Friday, April 27, 2012 9:40 AM