IMPORTANT NOTICE:
This step is not required for a new unit (factory calibrated). Verify CO
2
sen-
sor precision by exposing your unit to outdoor air every 6 months (correct
value stands between 300 and 500 ppm).
If you need to calibrate the sensor, please follow these instructions. At any
time before the last step, the calibration procedure may be cancelled,
causing the controller to return to normal operation.
CO
2
SENSOR CALIBRATION
Steps
IMPORTANT : Before beginning the calibration , bring the con-
troller outdoor (fresh air being use as a reference) and wait un-
til the reading is stable (2-3min). If the value on the screen is
around 350 to 450 ppm, YOU DO NOT NEED TO RECALIBRATE
YOUR UNIT.
1 Click knob repeatedly until "Set-Up & Cal" indicator turns ON.
2
Press knob and keep it pressed for about 5 seconds, until "Set
Up & Cal" light indicator begins to flash and "CAL" appears on
screen.
3
Let knob go, "CO
2
" and "CAL" appears on the screen alternately
(blinking).
CO
2
SENSOR CALIBRATION
8
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