MaCURCO GD-2A Combustible Gas Detector Instruction Manual
- June 3, 2024
- MaCURCO
Table of Contents
GD-2A Combustible Gas Detector
Instruction Manual
GD-2A Combustible Gas Detector
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 Technical Service.
General Safety Information
1.1 List of warnings
WARNING
Each person using this equipment must read and understand the information in
these User Instructions before use. Use 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.
Use only for monitoring the gas which the sensor and detector are designed to
monitor. Failure to do so may result in exposure to gases not detectable and
cause sickness or death. For proper use, see the supervisor or User
Instructions, or call Macurco Technical Service.
GD-2A may not function effectively below 32 °F or above 120°F. Using the
detector outside of this temperature range may adversely affect product
performance and result in sickness or death.
This detector helps monitor the presence and concentration level of certain
specified 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 overexposure and cause sickness or death. For proper use, see the
supervisor or User Instructions, or call Macurco Technical Service.
This product is intended for use in ordinary indoor locations of family living
units and office workspaces. The GD-2A is not designed to measure compliance
with Occupational 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
light will blink for a period of one and one-half to two minutes. Afterward,
the green LED light will turn on continuously to indicate the unit is in
normal operation (ARMED). If the self-test fails or the green LED light does
not turn on continuously do not use it. Failure to do so may adversely affect
product performance and result in sickness or death.
Immediately exit the environment if there is an alarm condition on the
detector. Failure to do so may result in sickness or death.
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.
Do not cover or obstruct the visual alarm LED. Doing so may adversely affect
product performance and result in sickness or death. Do not disassemble the
unit or attempt to repair or modify any component of this detector. This
detector contains no user-serviceable parts, and the substitution of
components may adversely affect product performance and result in sickness or
death.
CAUTION Avoid the use of harsh cleaning materials, abrasives, and other
organic solvents. Such materials may permanently scratch the surfaces, and
damage the sensor, labels, or instrument housing. If you have any doubts about
the applicability of the equipment to your job situation, consult an
industrial hygienist or call Macurco Technical Service.
Use Instructions and Limitations
The GD-2A is a low voltage (12-24 VAC or VDC) electronic detector of
combustible, heating-type gases, that has been evaluated by ETL for methane
(natural gas) and propane (LP) gas. The GD-2A 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 devices. The GD-2A does NOT detect
carbon monoxide. The GD-2A does not have an internal audible sounder.
WARNING
Each person using this equipment must read and understand the information in
these User Instructions before use. Use 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.
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 intended for installation in buildings in
non-hazardous locations such as residences, retail stores, office buildings,
and institutional buildings.
WARNING
Use only for monitoring the gas which the sensor and detector are designed to
monitor. Failure to do so may result in exposure to gases not detectable and
cause sickness or death. For proper use, see the supervisor or User
Instructions, or call Macurco Technical Service.
2.2 Do NOT use it for
The GD-2A is NOT intended for use in industrial applications such as
refineries, chemical 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 GD- 2A to Fire Alarm
Circuits, Burglar Alarms,s or other signals. The Alarm Control Panel must be
dedicated to gas detection or have alarm devices that provide a distinctive
alarm for gas detection. Do NOT mount the GD-2A in kitchens or bathrooms –
alcohol, 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.
WARNING
GD-2A may not function effectively below 32 °F or above 120°F. Using the
detector outside of this temperature range may adversely affect product
performance and result in sickness or death.
2.3 Features
- Listed 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-restoring or latching
- Electronic sensors: no maintenance or recalibration
- Temperature-compensated
- Simple installation and operation
- Supervised sensor
2.4 Specifications
- Size: 4 ½ X 5 X 1 5/8 inches
- Shipping weight: 0.54 pounds
- VOLTAGE: 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 alarm): 70 mA @ 12 VDC, 35 mA @ 24 VDC, 100 mA @ 12 VAC, 65 mA @ 24 VAC
- Color: White
- Sensor maintenance: Not required
- Alarm relay rating: 0.125 AMPS, 40V, 3VA
- Trouble relay: 0.250 AMPS, 40V, 10VA
- Operating temperature range: 32° to 120° F
- Alarm set point: Per UL 1484 (25% LEL)
Installation and Operating Instructions
The following 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.
WARNING
This detector helps monitor the presence and concentration level of certain
specified 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 overexposure and cause sickness or death. For proper use, see the
supervisor or User Instructions, or call Macurco Technical Service.
3.1 Location
A GD-2A is usually located in each room (except kitchens or bathrooms) where
there are gas appliances or through which 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
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
-
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.
-
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.
-
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.
-
When using the GD-2A with normally closed initiating circuits, use the Com. and N.C. alarm relay connections.
-
See the 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 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 amperes 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. -
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.
-
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 watts in alarm.
-
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 of sound output.
Operation
WARNING When the unit is powered up it performs a self-test during which
the green LED light blinks for a period of one and one-half to two minutes.
Afterward, the green LED light will turn on continuously to indicate the unit
is in normal operation (ARMED). If the self-test fails or the green LED light
does not turn on continuously do not use it. Failure to do so may adversely
affect product performance and result in sickness or death.
4.1 Power Up
When power is first applied to the detector, it will go through a warm-up
period of two and one-half minutes, during which alarms are inhibited. The
green LED light will turn on and off during the delay period. The green light
will turn on continuously (ARMED) afterward to indicate the unit is in normal
operation.
- 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.
- 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 unlatch the alarm condition.
- 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 on the upper right-hand side. Clip or cut this jumper wire and separate the wire ends. Now the unit will stay in alarm (once the 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.
- The GD-2A has a supervisory circuit of critical functions. A trouble condition, due to the 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
WARNING
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, Burglar Alarms, 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. WARNING 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 is
- 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.
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 relays 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.
**WARNING
Do not cover or obstruct the visual alarm LED. Doing so may adversely affect
product performance and result in sickness or death.
4.4 End-Of-Life 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 life and needs to
be replaced. The end-of-life signal will cause an open circuit in the normally
closed (NC) Trouble Relay to provide actuation of the signal circuits. The
green LED will remain steady and the red LED will flash every second to
indicate an end-of-life signal. The end-of-life signal can be silenced for 48
hours by resetting the power of GD2A. The end-of-life signal also resets the
Trouble Relay to the Normally Closed (NC) position and LED will also be reset.
The silence function will continue to be available for 29 days after the GD-2A
initiates an end-of-life signal. After this 29-day period, the GD-2A can no
longer be silenced and must be replaced.
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.
WARNING
Do not disassemble the unit or attempt to repair or modify any component of
this instrument. This instrument contains no user-serviceable parts, and
substitution of components may impair intrinsic safety which may adversely
affect product performance and result in sickness or death.
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 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
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.
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 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.
Macurco Gas Detection Product limited warranty
Macurco warrants the GD-2A gas detector will be free from defective materials
and workmanship for a period of two (2) years from the date of manufacture
(indicated on the inside cover of the GD-2A), provided it is maintained and
used in accordance with Macurco instructions and/or recommendations. 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 A 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 the said gas
detector. The manufacturer or its agent’s liability shall be limited to
replacement or repair as set forth above. The 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 Gas Detection
3601 N. St. Paul Avenue
Sioux Falls, SD 57104
Technical Support Contact Information
REV – 1.0.0
Issue Date: 10-29-2020
Document No: 34-8706-2454-0
© Aerionics 2021. All rights reserved.
Macurco is a trademark of Aerionics, Inc.
Phone: 1-844-325-3050
Fax: 1-605-951-9616
Email: support@macurco.com
Website: www.macurco.com/support
General Contact Information
Phone: 1-877-367-7891
Fax: 1-605-951-9616
Email: info@macurco.com
Website: www.macurco.com
www.macurco.com
1-844-325-3050
support@macurco.com
3601 N St. Paul Ave Sioux Falls. SD 57104