Macurco RD-6 User Instructions page 21

Note: If the Fan relay does not change state 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. Detector has fan relay set to disable (diS) or higher than 300 ppm. Set fan relay to 100 ppm and repeat the test.
c. Detector has fan relay delay set to 3 or more minutes. Set fan relay to 0 minutes and repeat the test.
d. Detector is in need of servicing (return unit to factory for servicing).
6. Remove the gas from the sensor. Proceed to Test the Alarm relay or replace the top cover. Fan relay test is complete.
Testing the Alarm Relay
Note: The gas concentration to activate the Alarm relay depends on the setting.
1. Connect the 300 ppm cylinder of Refrigerant 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 gas 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 gas concentration reaching the Alarm Relay setting, (150 ppm, for example) the
display will flash back and forth between "ALr" and "150". The buzzer will sound indicating "Alarm" if the buzzer is turned "On".
With the display function turned off the display does not show the gas concentration, but will show "ALr" when the Alarm relay
is activated.
Note: If the Alarm relay fails to operate within 2 minutes, there are three possibilities:
a. Gas cylinder is empty, check the pressure gauge. Replace the gas cylinder if 25-psi or less.
b. Detector has Alarm relay set to disable (diS) or higher than 300 ppm. Set Alarm relay to 150 ppm and repeat the test.
c. Detector is in need of servicing (return unit to factory for servicing).
6. Remove the gas from the sensor after Test. Proceed to Test the 4-20mA output or replace the top cover. Alarm relay test is
complete.
Testing the 4-20mA current loop
1. Connect the 300 ppm cylinder of Refrigerant to the regulator.
2. Check the pressure gauge. If there is 25-psi or less the cylinder should be replaced.
3. Place the test hood from the regulator over the gas sensor. Turn on the regulator to start the gas flow.
4. The Fan relay should activate according to the settings.
5. The Alarm relay should activate according to the settings.
6. The 4-20 mA output should ramp up from 4mA in clean air to 9 mA at 300 ppm. See 4-20 mA diagram on page 7.
Note: If the 4-20mA output does not ramp up within 2 minutes, there are three possibilities:
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