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Macurco GD-2A Operation Manual
1. Once the GD-2A is operational (ARMED) the green light will be on continuously. If gas is detected the red
LED (ALARM) turns on and the SPDT alarm relay activates to indicate the alarm condition.
2. In the configuration, as shipped from the factory, the GD-2A is self-restoring. When the air clears of gas, the
red light turns off and the relay switches to its normal state. A jumper wire on the circuit board can be
clipped to allow the unit to latch in upon alarm. Once latched in, power will need to be interrupted to un-
latch the alarm condition.
3. The GD-2A can be modified, either before or after installation, to have a latching output. Pull off the cover
and locate the jumper wire labeled "CLIP FOR LATCH IN" on the printed circuit board in the upper right-hand
side. Clip or cut this jumper wire and separate the wire ends. Now the unit will stay in alarm (once gas has
exceeded the pre-set threshold) until the power is interrupted. When replacing the cover, make sure the
lights line up with their access holes.
4. The GD-2A has a supervisory circuit of critical functions. A trouble condition, due to failure of a non-reliable
component, results in both lights switching on and off and the normally closed trouble relay opening. A
power failure also causes the trouble relay to open.
4.2 Alarms
Immediately exit any environment if there is an alarm condition on the detector. Failure
to do so may result in sickness or death.
The final alarm is determined by the configuration of the control panel, with the GD-2A only switching its relay to
actuate the panel. Do not connect the GD-2A to Fire Alarm Circuits, or Burglar Alarm or other signals. The
illumination of the red (ALARM) light on the GD-2A indicates the alarm condition. When an alarm occurs
immediately evacuate the premises and seek assistance.
This detector will only indicate the presence of combustible gas at the sensor.
Combustible gas may be present in other areas. Accommodation spaces should be well
ventilated when household cleaning supplies or similar contaminants are used.
In addition to the methane (natural gas) and propane (LP) gas that it is designed to detect, the GD-2A can also be
affected by a broad range of combustible gases. Some of these that may cause an alarm are
•
alcohol,
•
ammonia,
•
cleaning solvents,
•
paint thinner,
•
gasoline vapors,
•
aerosol propellants.
•
Aerosol cans such as hair spray usually contain a combustible gas.
Always make sure that there is adequate ventilation when you use these products. Proper location, not in kitchens
or bathrooms, will minimize alarms due to normal use of household products.
REV – 1.0.0
WARNING
WARNING
[34-8706-2454-0 ]
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