UNT-SVX07B-EN 123
Diagnostics
a. All models: Measure between the grounded GND-SIGNAL (black) wire and either the
SETPOINT (red) or ZONE (white) wire. Compare resistance measurements to those in
Table 45.
b. WDS only: Measure between the grounded GND-SIGNAL (black) wire and the FAN/SYSTEM
(green) wire. Compare resistance measurements to those given in Table 46.
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
NOTICE
Equipment damage!
Spraying glass cleaner or any other solution directly on the sensor may damage it.
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.
Table 45. Receiver resistance table for all models
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 46. Receiver resistance table for model WDS
Fan command Nominal output resistance
High 16,130 Ω
Med 13,320 Ω
Low 10,770 Ω
Auto 2320 Ω
Off 4870 Ω
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