Bosch D382 Installation Manual

MACURCO GAS DETECTORS

GD-2A

INSTALLATION & OPERATING INSTRUCTIONS

GENERAL INFORMATION

The GD-2A is a low voltage (12-24 VAC or VDC) all electronic detector of combustible gases, that has
been evaluated by UL for methane (natural) and propane (LP) gas. The GD-2A is designed for connection to UL
Listed alarm control panels (Fire or Fire/Burglar type or Critical Process Management Equipment), although it
may be used alone, with UL Listed Class 2 limited energy power supplies. The GD-2A has a SPDT Alarm relay,
for connection to control panels or other devices. See the GD-2A data sheet for more technical information.

LOCATION

If the gas used is natural (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. Do NOT mount the
GD-2A in a corner.

INSTALLATION

The detector can mount on either a 4 X 4 or two gang electrical box. The GD-2A front cover will need to
be removed before mounting. This is done by firmly grasping and slightly squeezing the sides of the front cover,
while pulling it away from the rear part. The cover will snap off exposing the electronics and mounting plate. Use
the appropriate hole pattern for mounting. The four holes toward the center of the mounting plate match the hole
pattern of a two gang 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.

An optional back cover is available for the GD-2A to allow mounting directly over a single gang electrical
box. This device, Macurco # 40120, is of matching white plastic and provides an attractive enclosure to cover the
electronic components.

See the back of the GD-2A data sheet for more information on Installation.

OPERATION

When power is first applied to the detector, it will go through a warm-up period of one and one half to two
minutes, during which alarms are inhibited. The green light will turn on and off during the delay period. The
green light will turn on continuously (ARMED) afterwards to indicate the unit is in normal operation.
Once the GD-2A is operational (the green light on continuously), if gas is detected the red light (ALARM)
will illuminate at the same time the alarm relay switches. Any devices connect to the relay should be activated.

The unit, in its normal configuration as shipped from the factory, will automatically reset itself, by
shutting off the red light and returning the relay to the standby condition, once the air clears. 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. 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.

TROUBLE SIGNALS

The trouble signal is determined mostly by the configuration of the alarm panel, with the GD-2A trouble
relay only providing an open circuit for actuation. A failure of the gas-sensing element will result in both lights
turning on and off and the trouble relay opening. Failure of power supplies in the GD-2A or a lack of power to the
detector will result in the trouble relay opening.

The most common expected trouble would be a break in the wiring between the panel and the GD-2A.

TESTING

Once the unit is fully operational (the green light is on steady), test the unit by directing gas from an
unlighted butane cigarette lighter into the detector near the left hand side through one of the vent holes. It will be

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GD-2A INSTALLATION (CONT.)

necessary to hold the lighter valve open for several seconds. The red light (ALARM) will turn on, the alarm relay
switches, and any devices connected should activate.

The detector should be tested regularly by using gas from an unlit cigarette lighter, as detailed above.

ALARM SIGNALS

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.

WHEN A TROUBLE SIGNAL OCCURS

Call the alarm panel installer for advice.

SENSOR POISONS

The gas-sensing tip in the detector is designed with extreme sensitivity to the environment. As a result,
the sensing function of the tip may be deteriorated if it is exposed to a direct spray from aerosols such as paints,
silicone vapors, etc., or to a high density of corrosive gases (such as hydrogen sulfide, sulfur dioxide) for an
extended period of time.

ALARMS DUE TO NORMAL ACTIVITIES

In addition to the methane (natural), propane, and 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 nuisance alarms include:
alcohol’s, ammonia, cleaning solvents, paint thinner, gasoline fumes, and aerosol propellants. Aerosol cans such
as hair spray usually contain a combustible gas.
Proper installation, not in kitchens or bathrooms, will minimize unwanted alarms.

SERVICING OF GAS DETECTOR

The GD-2A does not require regular maintenance. The unit uses a self-purging semi-conductor sensor
that has a long life expectancy. All maintenance and repair of products manufactured by Macurco, Inc. are to be
performed at the Macurco manufacturing facility. Macurco does not sanction any third-party repair facilities.

LIMITED WARRANTY

The GD-2A gas detectors are warranted to be free from defective material and workmanship for a period
of two (2) years from the date of manufacture (stamped on the unit). If any component becomes defective during
the warranty period, it will be replaced or repaired free of charge, if the unit is returned in accordance with the
instructions below. This warranty does not apply to units that have been altered or had repair attempted, or that
have been subjected to abuse, accidental or otherwise. The above warranty is in lieu of all other express
warranties, obligations or liabilities. THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR PARTICULAR PURPOSE ARE LIMITED TO A PERIOD OF TWO (2) YEARS. Macurco shall not be
liable for any incidental or consequential damages for breach of this or any other warranty express or implied
arising out of or related to the use of said gas detector. Manufacturer or its agents liability shall be limited to
replacement or repair as set forth above. Buyer’s sole and exclusive remedies are return of the goods and
repayment of the price, or repair and replacement of non-conforming goods or parts. (The Uniform Commercial
Code applicable in the State of Colorado shall govern.)

RETURN INSTRUCTIONS

Call [phone] for a Return Authorization number. Then carefully pack the gas detector with a
written description of the nature of the return. Send the unit to the following address:

Macurco Inc.
3946 South Mariposa Street
Englewood, Colorado 80110

Rev 5/98

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