Testing The Alarm Relay - Macurco CD Series User Instructions

Macurco CD-xx H/MC Manual
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-xxH/MC will show the current concentration of CO
CO concentration reaches the Fan Relay setting (2000 ppm, for example) the display will flash back and forth between
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"FAn" and "current gas reading". With the display function turned "Off", the display does not show the CO
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. The gas cylinder is empty, check the pressure gauge. Replace the gas cylinder if 25psi or less.
b. Gas cylinder has reached its expiration date. Replace the gas cylinder.
c. Unit needs to be re-calibrated (automated background calibration for CD-6H, Manual Calibration for CD-6MC)
then re-test. The detector is in need of servicing (contact Technical Support for at 1-844-325-3050 servicing
options).
d. The detector has fan relay set to disable (diS). Set fan relay to 2000 ppm and repeat the test.
e. The detector has fan relay delay set to 3 minutes. Set fan relay delay to 0 and repeat the test.
f. Remove the gas from the sensor. Proceed to Test the Alarm relay or replace the top cover.

7.3.2 Testing the Alarm Relay

Note: The CO concentration to activate the Alarm relay depends on the setting.
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1. Connect the 5000 ppm cylinder of carbon dioxide to the regulator.
2. Check the pressure gauge on the regulator. If you have 25-psi or less, you will need to replace the gas canister. Check
the expiration date on the cylinder, if it has passed the expiration date the cylinder should be replaced.
3. Place the Test Hood over the CO
4. The Fan relay should activate according to the settings.
5. With the display function turned "On" and the CO
example) the display will flash back and forth between "ALr" and "current gas reading". The buzzer will sound
indicating "Alarm" if the buzzer is turned "On". With the display function turned off the display does not show the CO
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:
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REV – 1.1
Figure 7-1 Calibration Connection
sensor. Turn on the regulator to start the gas flow.
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concentration reaching the Alarm Relay setting, (4000 ppm, for
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[34-2900-0510-8]
in the air. When the
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