AT-VL-03T
Carbon Dioxide Monitor & Air Alert
User manual
Important safety information Warning
Always turn off power before mounting, removing, and cleaning the monitor.
Read all of the information in this manual before mounting the monitor.
Notice the supply power voltage of the monitor: 24VAC/DC. do not confuse it and do not install on voltages
higher than marked the monitor.
Do not touch the circuit board or components with electrifying, to avoid danger for users.
Mounting (see Fig.1)
Find the 2 clips on either side of the indicator; depress them with a non-edge tool to remove the main part
and the clapboard from the wall plate.
Mount the wall plate first on the wall, 1.2-1.3 meters above the floor. Place the indicator against the wall at
desired location; make sure wires can be feed through opening on wall plate.
Connect wires to terminal strips (see fig.1). Make sure wiring connection correct and secure.
Attach the main with clapboard to the wall plate.
Buttons and LCD
Operation
1. After electrifying，OFF displayed on the right bottom of LCD，which means monitor is OFF.
2. Press power button for about 1 second to turn it on. The measured temperature and the measured humidity display on the upper line of LCD. The
measurement of CO
2
displays on the bottom line of LCD. If no humidity detection, the measurement of humidity shall not display.
3. If the monitor is used for the first time or is used again after long time laying up, it should be powered and turned on for 48 hours at least, to make the
CO
2
measurement in self calibration.
4. switch button: can be switched three different CO
2
alert values and 1 temperature set value displayed on top left of LCD and it marks by 1, 2, 3 and 4.
—1： Setting value is the boundary between green light and orange light (the first point) .The default setting is 1000ppm.
If CO
2
measurement≤ the setting value, the green light would be bright.
—2： Setting value is the boundary between orange light and red light (the second point). The default setting is 1400ppm.
If the first setting value< CO
2
measurement and ≤ the setting value, the orange light would be bright
If CO
2
measurement > the setting value, the red light would be bright.
—3： Setting the CO
2
value which used to control the analog output (just for DIP3 = OFF, DIP4 = ON).
If CO
2
measurement>the third setting ,the controller will be have the analog output.
—4： Temperature value setting (effective when DIP3=OFF and DIP4=ON, also parameter18=1), setting range: 5~50℃/ 41~122℉
Control way: when measured temp.≥ (setting temp. + temp. differential), the analog output is maximum;
when (setting temp. + temp. differential) >measured temp.> (setting temp. - temp. differential) , the analog output keeps on last status ;
when measured temp.≤ (setting temp. - temp. differential), the analog output is controlled by CO
2
level.
There will be no analog output when the CO2 monitor is switched off by pressing ‘power’ button.
5. Preset CO
2
setting value: choose the first or second or third point of CO
2
by press button of switch in circle,
then set the value by press ▲ or ▼ with 1ppm adjusting each time. When press ▲ or ▼ for more than
3 seconds, the setting value would change quickly with 10ppm each time.
Preset temperature setting value: choose the temperature setting value by press button of switch , then set
the value by press ▲ or ▼ with 0.5℃ adjusting each time. When press ▲ or ▼ for more than 3
seconds, the setting value would change quickly. As you adjust the value, it would blink up to confirm it.
6. Lock the settings: press ▲ and ▼ simultaneously for 5 seconds until appearing in the top right corner.
Then you cannot adjust the set values.
7. Unlock the setting: press the ▲ and ▼ simultaneously for 5 seconds until disappears.
8. The number of scale bar are corresponding with 0～10V analog output. One scale bar indicates 1VDC of
analog output.
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