Technical Service.
Macurco™ GD-2A
Combustible Gas Detector
Installation & Operation Manual
IMPORTANT: These User Instructions are to be provided to the homeowner/end user upon product
installation. Each person installing or using this equipment must read and understand the information
in these User Instructions before use. Installation of this equipment by untrained or unqualified
persons, or use that is not in accordance with these User Instructions may adversely affect product
performance and result in sickness or death. For proper use see User Instructions or call Macurco
Macurco GD-2A Operation Manual
REV – 1.0.1
[34-8706-2454-0]
2 | P a g e
1 General Safety Information ................................................................................................................................ 3
1.1 List of warnings .......................................................................................................................................... 3
2 Use Instructio ns and Limitations ......................................................................................................................... 4
2.1 Use For ...................................................................................................................................................... 4
2.2 Do NOT use for .......................................................................................................................................... 4
2.3 Features .................................................................................................................................................... 5
2.4 Specifications ............................................................................................................................................. 5
3 Installation and Operating Instructions ............................................................................................................... 5
3.1 Location .................................................................................................................................................... 5
3.2 Installation................................................................................................................................................. 6
4 Operation ......................................................................................................................................................... 7
4.1 Power Up .................................................................................................................................................. 7
4.2 Alarms ...................................................................................................................................................... 8
4.3 Troubl e Indicator ....................................................................................................................................... 9
4.4 End-Of-Life Indicator .................................................................................................................................. 9
5 Maintenance ..................................................................................................................................................... 9
5.1 Cleaning .................................................................................................................................................... 9
5.2 Sensor Poisons .......................................................................................................................................... 9
6 Testing ............................................................................................................................................................ 10
7 Macurco Gas Detection P roduct limited warranty ............................................................................................. 11
Technical Support Contact Information ............................................................................................................................... 11
General Contact Information ................................................................................................................................................ 11
Macurco GD-2A Operation Manual
REV – 1.0.1
[34-8706-2454-0]
3 | P a g e
WARNING
Each person using this equipment must read and understand the information in these
product performa nce and result in sickness or death.
Use only for monitoring the gas which the sensor and detector are designed to monitor.
Service.
GD-2A may not fu nction ef fectively below 32 °F or above 120°F. Using t he detector
in sickness or death.
This detector helps monitor for the presence and concentration level of certain s pecified
Macurco Techni cal Service.
This product is intended for use in ordinary indoor locations of family living units and
Safety and Health Administration (OSHA) commercial or industrial standards.
When the unit is powered up it performs a self -test during which the green LED lig ht will
Immediately exit the environment if there is an alarm condition on the detector. Failure
to do so may result in sickness or death
This d etector will only indicate the presence of combustible gas at the sensor.
ventilated when household cleaning supplies or similar contaminants are used.
Do not cover or obstruct visua l alarm LED. Doing so may adversely affect product
Do not disassemble unit or attempt to repair or modify any component of this detector.
adversel y affect product performanc e and result in sickness or death.
CAUTION
Avoid the use of harsh cleaning materials, abrasives and other organic solvents. Such
instrument housing.
If you have any doubts about the applicability of the equi pment to your job situation,
1 General Safety Information
1.1 List of wa rnings
User Instructions b efore use. Use of this equi pment by untrained or unqualified persons
or u se th at is not in acc ordance with these User Instructions, ma y adversely affect
Failure to do so may result in exposures to gases not detectable and cause sickness or
death. For proper use, see supervisor or User Instructions, or cal l Macurco Technical
outside of this temperature range may adversel y affect product performance and result
airborne gases. Misuse may produce an inaccurate reading, which means that higher
levels of the gas being monitored may be present and could r esult in overexposure and
cause sickness or death. Fo r proper use, see supervisor or User Instructions, or call
office workspaces. The GD-2A is not designed to measure compliance with Occupational
blink for a period of one and one half to two minutes. Afterward, the green LED light will
turn on continuous ly to indicate the unit is in normal operation (ARMED). If the self-t est
fails or the green LED light does not turn on continuously do not use. Failure to do so
may adversely affect product performance and result in sickness or death.
Combustible gas may be present in other areas. Accommodation spaces should be well
performance and result in sickness or death.
This detector contains no user serviceable parts, and substitution of components may
materials may permanently scratch the surfa ces, damage the sen sor, labels or
consult an industrial hygienist or call Macurco Technical Service.
.
Macurco GD-2A Operation Manual
REV – 1.0.1
[34-8706-2454-0]
4 | P a g e
WARNING
Each person using this equipment must read and understand the information in these
WARNING
Use only for monitoring the gas which the sensor and detector are designed to monitor.
Service.
WARNING
GD-2A may not function effectively below 32 °F or above 120°F. Usin g the detector
result in sickness or death.
2 Use Instructions and Limitations
The GD-2A is a low voltage (12-24 VAC or VDC) electronic detector of combus tible, heating type
gases, that has been evaluated by ETL for methane (natural gas) and propane (LP) gas. The GD2A is designed for connection to Fire Alarm/Burglary Control Panels. The GD-2A has a SPDT
Alarm relay, for connection to control panels or other devic es. The GD-2A does NOT detect ca rbon
monoxide. The GD-2A does not have an internal audible sounder.
User Instructions b efore use. Use of this equi pment by untrained or unqualified persons
or u se th at is not in acc ordance with these User Instructions, ma y adversely affect
product performa nce and result in sickness or death.
2.1 Use For
The GD-2A is an electronic detector of combustible, heating type gases (natural gas and propane),
designed for connection to alarm control panels. It can operate on 12 to 24 VDC power from
standby or interruptible panel power or be powered separately. The GD-2A is inte nded for
installation in buildings in non-hazardous locations such as residences, retail stores, office
buildings, and institutional buildings.
Failure to do so may result in exposures to gases not detectable and cause sickness or
death. For proper use, see supervisor or User Instructions, or call M acurco Technical
2.2 Do NOT use for
The GD-2A is NOT intended for use in industrial applications such as refineries, ch emical plants ,
etc. The GD-2A does NOT detect carbon monoxide. Do NOT mount the GD-2A in a corner. The
GD-2A is designed for connection to Fire Alarm/Burglary Control Panels . Do not connect the GD2A to Fire Alarm Circuits, or Burglar Alarm or other signals. The Alarm Control Panel must be
dedicated to gas detection or have alarm devices that provide a distinctive alarm for gas detecti on.
Do NOT moun t the GD-2A in kitchens or bathrooms - alcohol’s, ammonia, cleaning solvents, paint
thinner, gasoline vapors, and aerosol propellants (aerosol cans such as hair spray usually contain
a combustible gas) may cause nuisance alarms.
outside of this temperature range may adversely affect product performance and
Macurco GD-2A Operation Manual
REV – 1.0.1
[34-8706-2454-0]
5 | P a g e
WARNING
This detector helps monitor for the presence and concentration level of certain specified
Macurco Techni cal Service.
2.3 Features
• Liste d to UL standard 2075 for the standard for safety for gas and vapor detectors and sensors
• Sensitivity tested based on UL 1484 standard for residential gas detectors
• Detects heating gases: propane (LP) and natural gas (methane)
• SPDT alarm and N.C. trouble relays
• Can be self-restor ing or latching
• Electronic sensors: no maintenance or recalibration
• Temperature compensated
• Simple installation and operation
• Supervised sensor
2.4 Specific ations
• Size: 4 ½ X 5 X 1 5/8 inches
• Shipping weight: 0.54 pound
• VOLT AGE: 12 to 24 VAC or VDC
• Current (non-alarm): 45 mA @ 12 VDC, 22 mA @ 24 VDC, 65 mA @ 12 VAC, 45 mA @ 24VAC
• Current (in alar m): 70 mA @ 12 VDC, 35 mA @ 24 VDC, 100 mA @ 12 VAC, 65 mA @ 24 VAC
• Color: White
• Sensor maintenance: Not required
• Alarm relay ratin g: 0.125 AMPS, 40V, 3VA
• Trou ble relay: 0.250 AMPS, 40V, 10VA
• Operating temperature range: 32° to 120° F
• A
3 Installation and Operating Instructions
The followin g instructions are intended to serve as a guideline for the use of the Macurco GD-2A
Combustible Gas Detector. It is not to be considered all-inclusive, nor is it intended to replace the
policy and procedures for each facility.
3.1 Location
A GD-2A is usually located in each room (except kitchens or bathrooms) where there is gas
appliances or through whi ch gas pipes pass. Do NOT mount the GD-2A in a corner. Do NOT
mount the GD-2A in kitchens or bathrooms - alcohols, ammonia, cleaning solvents, paint thinner ,
gasoline vapors, and aerosol propellants (aerosol cans such as hair spray usually contain a
combustible gas) may cause alarms. Do NOT mount the GD-2A where the normal ambient
larm set point: Per UL 1484 (25% LEL)
airborne gases. Misuse may produce an inaccurate reading, which means that higher
levels of the gas being monitored may be present and could result in overe xposure and
cause sickness or death. For proper use, see supervisor or User Instructions, or call
Macurco GD-2A Operation Manual
REV – 1.0.1
[34-8706-2454-0]
6 | P a g e
WARNING
This product is intended for use in ordinary indoor locations of family living units and
Safety and Health Administration (OSHA) commercial or industrial standards.
temperature is below 32° F (0° C) or exceeds 120° F (50° C).
office worksp aces. The GD-2B is not desig ned to measure compliance with Occupational
3.2 Installat ion
1. If the gas used is nat ural gas (methane) mount the GD-2A on a wal l 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 sa me
spacing as for smoke detectors- 30-foot centers, 900 square feet per detector.
2. The three-part plastic case all ows 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 co in or flat screwdri ver 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 holepattern for installation. The four holes towa rd the center of the mounting plate match the hole- patte rn of a
double gang electrical box. The four holes near the corners mat ch the pattern of a four-inch square box.
Mount t he 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
insulat ion, when thermoplastic, shall not be less than 1/32 inch (0.8mm) thick.
• E
xception No. 1: A lead is not prohibited from being less than 6 inches long when it is evident that t he 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 T he 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 T here are two or more conductors, and they are covered by a common jacket, or the equivalent;
and
o T he assembled conductors comply with the requirements of the Strain Relief Tests, Section 18.
6. The GD-2A uses a full wave bridge rect ifier 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 mat ch the wide input voltag e 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
provide d 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.
Macurco GD-2A Operation Manual
REV – 1.0.1
[34-8706-2454-0]
7 | P a g e
WARNING
When the unit is powered up it performs a self-te st during wh ich the g reen LED li ght
so may adversely affe ct product performance and result in sickness or death.
4 Operation
4.1 Power Up
When power is first applied to the detector, it will go through a warm-up period of two and one-hal f minutes, during
which alarms are inhibited. The green LED light w ill turn on and off during the delay period. The green light will turn
Figure 3-1 – Connect ion of a single GD-2A to an alarm control panel
Figure 3-2 – C onnection of multiple GD-2A to an alarm control panel
blinks for a perio d of one and one half to two minutes. Afterwards, the green L ED light
will turn on continuously to indicate the unit is in normal operation (ARMED). If the selftest fails or the green LED light does no t turn on continuo usly do not use. Fai lure to do
Macurco GD-2A Operation Manual
REV – 1.0.1
[34-8706-2454-0]
9 | P a g e
WARNING
Immediately exit any environment if there is an alarm condition on the detector. Failure
WARNING
This detector will only indicate the presence of combustible g as at the sensor.
ventilated when household cleaning supplies or similar contaminants are used.
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 fr om the factory, the GD-2A is self-resto ring. When the air clea rs 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 unlatch the alarm condition.
3. The GD-2A can be modified, either before or afte r installation, to have a l atching output. Pull off t he cover
and locate the jumper wire labeled “CLIP FOR LATCH IN” on the printed circui t 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 swit ching on and off and the normally closed trouble relay opening. A
power failure also causes the trouble relay to open.
4.2 Alarms
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 t he GD-2A indicates the alarm condition. When an alarm occurs
immediately evacuate the premises and seek assistance.
Combustible gas may be present in other areas. Accommodation spaces should be well
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 v apors,
• aerosol propellants.
• Aero sol 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.
Macurco GD-2A Operation Manual
REV – 1.0.1
[34-8706-2454-0]
10 | P a g e
WARNING
Do not cover or obstruct visua l alarm LED. Doing so may adversely affect product
performance and result in sickness or death.
WARNING
Do not disassemble unit or attempt to repair or modify any component of this
performance and result in sickness or death.
4.3 Trouble Indicator
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. When a trouble signal occurs call the alarm panel installer for assistance.
4.4 End-Of-Lif e Indicator
5 years after the GD-2A is installed the end-of-life signal will be activated indicating that the GD-2A has reached the
end of its service l ife and needs to be replaced. The end-of -life signal will c ause an open circuit in the normally close
(NC) Trouble Relay to provide actuation of the signal circuits. The green LE D will remain steady and red LED will flash
every second to indicate end-of-life signal. End-of-life signal can be silenced for 48 hours by resetting power of GD2A. End- of-life signal also resets the Trouble Relay to the Normally Closed (NC) position and LED will also be reset.
The silence f unction will continue to be available for 29 days after the GD-2A initi ates an end-of-life signal. After this
29-day period, the GD-2A can no longer be silenced and must be replaced.
5 Maintenance
The GD-2A does not require regular maintenance. The unit uses a self-purging semi-conductor sensor that has a
long-life expectancy. All service and repair of the GD-2A are to be performed by Macurco. Macurco does not
sanction any third-party repair facilities.
5.1 Cleaning
The GD-2A should be cleaned using the soft brush attachment of your vacuum cleaner. The GD-2A should be tested
after cleaning to ensure the unit is operating normally.
5.2 Sensor Poisons
Once the unit is fully operational (the green light is on steady), test the unit by di recting gas from an unlighted
butane cigarette lighter into the detector near the left-hand side throug h one of the vent holes. It will be necessary
to hold the lighter valve open for several seconds. The red light (ALARM) wi ll turn on, the alarm relay switch es, and
any devices connected should activate. The detector should be tested regularly by using gas from an unlit cigarette
lighter, as detailed above.
instrument. This instrument contains no user serviceable parts, and substitution of
components may impair intrinsic safety which may ad versely affect product
Macurco GD-2A Operation Manual
REV – 1.0.1
[34-8706-2454-0]
11 | P a g e
6 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 throug h one of the vent holes. It will be necessary
to hold the lighter valve open for several seconds. The red light (ALARM) wi ll turn on, the alarm relay switch es, and
any devices connected should activate. The detector should be tested regularly by using gas from an unlit cigarette
lighter, as detailed above.
7 Macurco Gas Detection Product limited warranty
Macurco warrants the GD-2A gas detector will be f ree from defective materials an d workmanship for a per iod of two
(2) years from the date of manufacture (indicated on inside cover of the GD-2A), provided it is maintained and used
in accord ance with Macurco instructions and/or rec ommendations. If any component becomes defective during the
warranty period, it wi ll 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 otherw ise. The above warranty is in lieu of all oth er express warranties, obligations
or liabilities. THE IMPLIED WARRANTIES OF M ERCHANTABIL ITY AND FITNESS FOR PARTICULAR PURPOSE ARE LIMITED
TO A PERIOD OF TWO (2) YEARS FROM THE PURCHASE DATE. 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. The manufacturer or its agent’s liability shall be limited to replacement or repair as set forth
above. Buyer’s sole and exclusive remedies are the return of the goods and repayment of the price, or repair and
replacement of non-conforming goods or parts.
Macurco GD-2A Operation Manual
REV – 1.0.1
[34-8706-2454-0]
12 | P a g e
Macurco Gas Detection
1504 W 51st St
Sioux Falls, SD 57105
Technical Support Contact Informatio n
Phone: 1-844-325-3050
Fax: 1-605-951-9616
Email: support@macurco.com
Website: www.macurco.com/support/
REV – 1.0.1
Issue Date : 1.18.2023
Document No: 34-8706-2454-0
© Macurco 2023. All rights reserved.
General Contact Information
Phone : 1-877-367-7891
Fax : 1-605-951-9616
Email : info@macurco.com
Website: www.macurco.com
Loading...