Wattstopper DT-355 Installation Instructions Manual - Override

1.   One or both of the sensor technologies (PIR or ultrasonic) may be 

experiencing activations from outside the controlled area or from some 

type of interference (see “Unwanted Sensor Activations” below).

2.  Check all sensor wire connections.

3.   Turn sensitivity and time delay to minimum and allow the sensor to time 

out.  

If the lights turn off, the sensor is working properly (see number 1, above, 

and “Sensor Adjustment” for readjustment of sensor). 

UnwantedSensorActivations(LEDflashes):

• Possiblecauses

1.   Improper sensor location or inadequate masking causing detection 

outside of desired coverage area.

2.   The ultrasonic sensitivity may be too high.

3.  The PIR sensitivity may be set too high.

4.  Sensor located too close to HVAC or VAV vents with heavy air flow.

• Possiblesolutions

1.  Reduce the ultrasonic sensitivity (counterclockwise) as needed (see 

“Sensor Adjustment”).

2.   Mask the lens to reduce PIR coverage (see “Masking the lens”, under 

“Coverage Patterns”).

3.  Change the logic configuration setting, see “Logic Configuration”.

4.  Relocate the sensor.

Override

To override all sensor functions, set the Ultrasonic Sensitivity trimpot to the 

fully counterclockwise (Override) position.

This bypasses the occupancy and light level control functions of the sensor, but 

still allows the lights to be manually controlled with a light switch.

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