Macurco CD-12 Manual Del Usuario página 22

5. Turn on the regulator to start the gas flow and wait with the gas applied continuously.
6. With the display function turned "On", the CD-12 will show the current concentration of CO2 in the air. When the CO2
concentration reaches the Fan Relay setting (1000 ppm, for example) the display will flash back and forth between "FAn" and
"1000". With the display function turned "Off", the display does not show the CO2 concentration, but will show "FAn" as long as
the fan relay is activated.
Note: If the Fan relay does not close within 2 minutes, there are five possibilities:
a. Gas cylinder is empty, check the pressure gauge. Replace the gas cylinder if 25psi or less.
b. Unit needs to be re-calibrated (automated background calibration) then re-test.
c. Detector is in need of servicing (return unit to factory for servicing).
d. Detector has fan relay set to disable (diS). Set fan relay to 1000 ppm and repeat the test.
e. Detector has fan relay delay set to 3 minutes. Set fan relay delay to 0 and repeat the test.
7. Remove the gas from the sensor. Proceed to Test the Alarm relay or replace the top cover.
Testing the Alarm Relay
Note: The CO2 concentration to activate the Alarm relay depends on the setting.
1. Connect the 2000 ppm cylinder of carbon dioxide to the regulator.
2. Check the pressure gauge. If there is 25psi or less the cylinder should be replaced.
3. Place the Test Hood over the CO2 sensor. Turn on the regulator to start the gas flow.
4. The Fan relay should activate according to the settings.
5. With the display function turned "On" and the CO2 concentration reaching the Alarm Relay setting, (1500 ppm, for example) the
display will flash back and forth between "ALr" and "1500". The buzzer will sound indicating "Alarm" if the buzzer is turned "On".
With the display function turned off the display does not show the CO2 concentration, but will show "ALr" when the Alarm relay
is activated.
Note: If the Alarm relay fails to operate within 2 minutes, there are four possibilities:
a. Gas cylinder is empty, check the pressure gauge. Replace the gas cylinder if 25-psi or less.
b. Unit needs to be re-calibrated (automated background calibration and re-test).
c. Detector is in need of servicing (return unit to factory for servicing).
d. Detector has Alarm relay set to disable (diS). Set Alarm relay to 1500 ppm and repeat the test.
6. Remove the gas from the sensor after Test. Proceed to Test the 4-20mA output or replace the top cover.
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