3 Macurco™ Combustible Gas Detector, Controller and Transducer User Instructions Important: Keep these User Instructions for reference.
TABLE OF CONTENTS GENERAL SAFETY INFORMATION.................................................................................................................2 Intended Use...........................................................................................................................................2 List of Warnings and Cautions.................................................................................................................2 USE INSTRUCTIONS AND LIMITATIONS........................
GENERAL SAFETY INFORMATION Intended Use The 3M™ Macurco™ GD-6 Combustible Gas Detector, Controller and Transducer is a low voltage device with selectable 4-20mA output, buzzer and digital display options. It is an electronic detection system used to measure the concentration of combustible gas and provide feedback and automatic exhaust fan control to help reduce combustible gas concentrations in parking garages, maintenance facilities or other light commercial applications.
Features • ETL Listed to UL 61010-1 • The 3M™ Macurco™ GD-6 Combustible Gas Detector can be bump-tested with the FTK with 10% LEL Methane, 10% LEL Propane or 10% LEL Hydrogen gas, regulator and calibration hood. • The 3M™ Macurco™ GD-6 Combustible Gas Detector can be field calibrated using 10% LEL Methane, 10% LEL Propane or 10% LEL Hydrogen gas, regulator and calibration hood.
0 37.5 25 12.5 0 4. There are two terminals for Power: 12 to 24VAC or 12 to 48VDC, with no polarity preference. 5. There are two terminals for the dry alarm relay contacts, again with no polarity preference. The alarm relay can switch up to 0.5A, 200V, or 10VA. The alarm relay is activated if gas reaches or exceeds the alarm settings. 6. The alarm relay can be configured to normally open (default) (N.O.) or normally closed (N.C.
Typical Multiple 3M™ Macurco™ GD-6 Combustible Gas Detector Installation INSTALLATION NOTES 1. One sensor per 900 square feet (approximately). 2. If the gas used is natural gas (methane) or Hydrogen (H2) mount the 3M™ Macurco™ GD-6 Combustible Gas Detector high on a wall about one foot down from the ceiling. If the gas used is propane (LP), mount the 3M™ Macurco™ GD-6 Combustible Gas Detector on a wall or column one foot above the floor. 3.
GD-6 6 5 4 +24 VDC 24 V RET 24 V RET 7 120VAC Power 10 2 1 - Strobe 4 3 - Horn 2 + Horn 1 4 COM 3 N.O. 2 N.C. 1 Relay 3 N.O. 3 N.C. 1 COM Panel Power 120/250VAC N L N.O. Gnd The 3M™ Macurco™ GD-6 Combustible Gas Detector cycles through an internal self-test cycle for the first minute that it is powered. The unit will execute the test cycle any time power is dropped and reapplied (i.e. power failure).
To change settings, remove the Philips screw on the front of the 3M™ Macurco™ GD-6 Combustible Gas Detector. Pull off the front cover of the unit. Gas Selection To select the Gas Option, in normal mode, press the Next button once to display the current gas selection (mE is Methane, Pro is Propane and Hy is Hydrogen). Then press the Enter button twice to enter the selection menu. The currently selected gas will be shown on the display. Press Next to scroll through the available gases selections.
Selecting Fan Minimum Run Time – “Frr” To select the Fan Minimum Runtime setting, in normal mode, press the Next button twice to get to “Con” or the Configuration menu. Then press the Enter button to enter the Con menu. The ninth selection is the “Frr” or Fan Minimum Run Time. Press Next eight times to get to “Frr” then press Enter.
Operation Test 1. Remove the single screw in the middle of the front cover of the 3M™ Macurco™ GD-6 Combustible Gas Detector. 2. Remove the front cover. 3. Observe the LED light on the front of the 3M™ Macurco™ GD-6 Combustible Gas Detector. 4. If the light is solid green proceed to step 6. 5. If the light is off or flashing Green, refer to the General section of this User Instruction. 6. Locate the switch labeled ENTER/TEST on the left side of the printed circuit board. Press the Test switch once. 7.
Gas Testing Testing the Fan Relay Note: The gas concentration to activate the fan relay depends on the setting. 1. Remove the Philips screw on the front of the 3M™ Macurco™ GD-6 Combustible Gas Detector. Remove the front cover. 2. Connect the 10% LEL cylinder of Combustible Gas to the regulator. Ensure that the gas used for calibration matches the gas selected in the 3M™ Macurco™ GD-6 Combustible Gas Detector configuration. 3.
5. The 4-20mA output should ramp up from 4mA in clean air to 20mA at 50% LEL. See 4-20mA diagram in these User Instructions. Note: If the 4-20mA output does not ramp up within 2 minutes, consider these 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 4-20mA option set to “OFF”.
7. Press the Enter button and the display will read 10 alternating with the gas, mE, Pro or Hy (blinking), indicating the sensor is looking for gas. 8. Start applying gas to the gas sensor. Note: The sensor will look for the gas for 45 seconds. If no gas is applied or detected in that time, the display will return to CAL. 9. When the sensor detects the gas, the display will flash back and forth between the gas concentration and SPn and the calibration will progress.
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