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Document No. A6V11521281
Installation Instructions
February 20, 2019
Sensor Calibration
QAA4292.EWSC
The QAA4292.EWSC utilizes a stable, long life
sensing element that does not require calibration. The
temperature sensor accuracy is rated at +/- 1% (50°F
to 90°F).
QFA4292.EWSC
The QFA4292.EWSC utilizes a stable, long life
sensing element that does not require calibration. The
humidity sensor accuracy is rated at +/- 3% rh (11%
to 89% rh) and a long-term stability of +/- 0.25% rh
per year.
QPA4292.EWSC
The QPA4292.EWSC utilizes Non-Dispersive Infra-
Red (NDIR) technology and is self-calibrating to an
accuracy of +/- 50 ppm +3% of the reading.
To enable the sensor to self-calibrate it must see
"fresh air" a minimum of once per week. In most
HVAC use cases this should occur without
intervention, as CO
levels typically return to outdoor
2
background levels while the building is vacant.
If manual calibration is required, place the sensor
outside or in a location with a background
concentration of CO
near 385 ppm. Press the
2
Cal/RESET button on the inside of the sensor for two
seconds. The sensor should remain in this location
for 30 minutes.
NOTE: When placing the sensor outside for
calibration, ensure that it is not placed in
direct sunlight or where exposed to rain or
excess moisture. The temperature should be
between 0°F and 120°F.
Page 4 of 5
The QPA4292.EWSC has a selectable broadcast
interval from 1 to 5 minutes using the jumper
directly below the CAL/RESET button. The
default setting of 5 minutes will provide adequate
control in most spaces and result in maximizes
battery life.
•
Jumper 1 = 1 minute
•
Jumper 2 – 2 minutes
•
Jumper 3 = 3 minutes
•
Jumper 4 = 5 minutes
•
Jumper 5 = 10 minutes
NOTE: Battery life is 15 years at the factory
default of 5-minute broadcast intervals.
More frequent broadcasts will reduce
battery life.
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