CO
2
Deadband:
To change the CO
2
deadband, press the MENU but-
ton to display the first menu item. Use the UP and DOWN arrow buttons
to scroll through and find “Set CO
2
Deadband” on the LCD screen. To
change the setting, press the ENTER button. The current setting will
be highlighted to indicate the setting can be changed. Use the UP and
DOWN arrow buttons to change the setting. Press the ENTER button a
second time to accept the new setting and store it in memory.
Minimum CO
2
Level:
The unit records the minimum CO
2
level mea-
sured by the sensor. To reset the minimum level, press the MENU button
to display the first menu item. Use the UP and DOWN arrow buttons to
scroll through and find “Min CO
2
” on the LCD screen. To reset, press the
ENTER button twice after the value is displayed.
Maximum CO
2
Level:
The unit records the maximum CO
2
level mea-
sured by the sensor. To reset the maximum level, press the MENU button
to display the first menu item. Use the UP and DOWN arrow buttons to
scroll through and find “MAX CO
2
” on the LCD screen. To reset, press
the ENTER button twice after the value is displayed.
CO
2
Mode:
The unit will operate to Increase or Decrease CO
2
levels. In
most indoor growing and greenhouse applications, the unit should be set
to increase CO
2
levels. To change the CO
2
Mode, press the MENU but-
ton to display the first menu item. Use the UP and DOWN arrow buttons
to scroll through and find “Set CO
2
Mode” on the LCD screen. To change
the setting, press the ENTER button. The current setting will be highlight-
ed to indicate the setting can be changed. Use the UP and DOWN arrow
buttons to change the setting. Press the ENTER button a second time to
accept the new setting and store it in memory.
Selecting Photocell Settings
The unit will operate during the Day, Night or 24-hours mode. A built-in
photocell on the remote sensor detects the lighting level and automati-
cally activates the CO
2
output only during the hours the user selects. To
change the Photocell settings, press the MENU button to display the first
menu item. Use the UP and DOWN arrow buttons to scroll through and
find “Photocell Mode” on the LCD screen. To change the setting, press
the ENTER button. The current setting will be highlighted to indicate
the setting can be changed. Use the UP and DOWN arrow buttons to
change the setting. Press the ENTER button a second time to accept the
new setting and store it in memory.
Calibrating the CO
2
Sensor
The CO
2
sensor is factory calibrated, but should be calibrated once a
year. Place the sensor outside in a shaded area away from people and
other sources of CO
2
. Plug in the unit and allow the sensor to operate for
10-15 minutes. Press the MENU button to display the first menu item.
Use the UP or DOWN arrow buttons to scroll through and find “Calibrate
380PPM” on the LCD screen. Press ENTER twice to start the calibration
process. When the calibration process is complete, the unit will return to
normal operation after briefly displaying “380 Calibration Complete” on
the LCD screen.
Troubleshooting
The LCD screen is blinking and showing an error message.
All
detected errors will cause the unit to go into “safe mode.” It will shut
down the connected device and display one of the following errors:
Sensor Error
(problem with sensor)
Overload
(current draw exceeds 10A)
Holding the ENTER button for 3 seconds will reset any error except
for OVERLOAD and SENSOR. For a sensor error, ensure the sen-
sor cable is properly connected to the unit. For an overload error,
disconnect the unit from the electrical supply to reset the error. It may
be necessary to reduce the size of the connected equipment (if it ex-
ceeds a 10A draw) to prevent the OVERLOAD error from reoccurring.
See warranty procedure information if you reset the unit and the error
code continues to appear.
Why doesn’t the unit function immediately when plugged in?
When the unit is plugged in, it will take about 5-10 minutes for the
CO
2
sensor to warm up. During this time, the display will read
“WARMING UP.”
How can I tell if the photocell is working correctly?
The photocell will detect even dimly lit areas as being “Daytime.”
When the photocell senses enough light, it will activate the Day timer
settings and the unit will read “Day” on the left side of the display.
When it doesn’t detect light, the display will read “Night.”
The unit seems to be reading the CO
2
level incorrectly.
Ensure there is air circulation around the CO
2
sensor. Do not breathe
near or directly on the CO
2
sensor. To quickly verify the CO
2
sensor
is measuring CO
2
correctly, connect the unit to a power source away
from people or other sources of CO
2
. After 10 minutes the CO
2
read-
ing should be between 375 and 425 ppm. If it does not, recalibrate the
CO
2
sensor.
rev:112013
