Gas Testing; Testing The Fan Relay; Testing The Alarm Relay - Macurco CM-6 Manuel

Macurco CM-6/CM-12 Manual (Rev-1.1) Eng

7.3 Gas Testing

7.3.1 Testing the Fan Relay

1. Remove the Philips screw on the front of the CM-6. Remove the front cover.
2. Open the FCK. Connect the 50-ppm gas cylinder to the regulator.
3. Check the pressure gauge on the regulator. If you have 25-psi or less, you will need to replace the gas canister.
4. Assemble regulator, hose and Test Hood and place the Test Hood over the CO sensor.
Note: The time to activate the Fan relay depends on the delay setting.
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 CM-6 will show the current concentration of CO or "0" (zero) in clean air.
When the CO concentration reaches the Fan Relay setting (35 ppm, for example) the display will flash back and forth
between "FAn" and "current gas reding". 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 four 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 (go through recalibration and re-test).
c. Detector is in need of servicing (return unit to factory for servicing).
d. Detector has fan relay set to disable (diS) or 100ppm. Set fan relay to 25ppm and repeat the test.
7. 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.
1. Connect the 200ppm cylinder of carbon monoxide 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 CO sensor. Turn on the regulator to start the gas flow.
4. The Fan relay should activate according to the settings.
REV – 1.1
Figure 7-1 Calibration Kit Connection
[34-2900-0511-6]
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