Macurco GD-2A Operation Manual
REV – 1.0.0
[34-8706-2454-0 ]
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temperature is below 32° F (0° C) or exceeds 120° F (50° C).
WARNING
This product is intended for use in ordinary indoor locations of family living units and
office workspaces. The GD-2B is not designed to measure compliance with Occupational
Safety and Health Administration (OSHA) commercial or industrial standards.
3.2
Installation
1.
If the gas used is natural gas (methane) mount the GD-2A on a wall about one foot down from the ceiling. If
the gas used is propane (LP), mount the GD-2A on a wall or column one foot above the floor. Use the same
spacing as for smoke detectors- 30-foot centers, 900 square feet per detector.
2.
The three-part plastic case allows the GD-2A to be either surface mounted or installed over a four-inch
square or double gang electrical box, providing a near flush mount. The GD-2A snap on front cover will need
to be removed before installation. To remove it, lightly pry the front cover off of the mounting plate (middle
section) with a coin or flat screwdriver inserted into the vent at the bottom. The cover will snap off exposing
the electronics and mounting plate.
3.
For flush mount, remove the 2 screws and rear cover from the mounting plate and use the appropriate hole-
pattern for installation. The four holes toward the center of the mounting plate match the hole- pattern of a
double gang electrical box. The four holes near the corners match the pattern of a four-inch square box.
Mount the GD-2A so the “TOP” marked side of the mounting plate is at the highest side. Snap the front
cover back on when finished, making sure that the lights line up with the access holes.
4.
When using the GD-2A with normally closed initiating circuits, use the Com. and N.C. alarm relay
connections.
5.
See wiring diagram and information below for connections of the GD-2A.
•
UL 2075 Requirements - 12.4.1 Power supply leads provided for field connection shall not be less than 6
inches (152 mm) long, provided with strain relief, and shall be no smaller than 18 AWG (0.82 mm2). The
insulation, when thermoplastic, shall not be less than 1/32 inch (0.8mm) thick.
•
Exception No. 1: A lead is not prohibited from being less than 6 inches long when it is evident that the use of
a longer lead results in damage to the insulation.
•
Exception No. 2: Solid copper leads as small as 26 AWG (0.13 mm2) are not prohibited from use when:
o
The current does not exceed 1 ampere for lengths up to 2 feet (61 cm) and the current does not
exceed 0.4 ampere for lengths from 2 feet up to 10 feet (3.05 m);
o
There are two or more conductors, and they are covered by a common jacket, or the equivalent;
and
o
The assembled conductors comply with the requirements of the Strain Relief Tests, Section 18.
6.
The GD-2A uses a full wave bridge rectifier at its power input, so that it is independent of the polarity of the
input power. It can operate on DC or AC voltages between 12 and 24 volts.
7.
A switching regulator is used to efficiently match the wide input voltage range to the fixed, internal power
system. As a result, the power consumption is fairly constant at about 0.75 watts in normal operation, and
1.0 watt in alarm.
8.
The alarm control panel zone inputs must be terminated with end of line resistors (E.O.L.R.), which are
provided with the panel. The GD-2A does not have an internal audible sounder and must be connected to a
Fire Alarm/Burglary Control Panel with an audible device that provides at least 85 dB sound output.
