Macurco GD-2B - Gas Detector User Guide Dated 04/06/2015



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Macurco™ GD-2B
Combustible Gas Detector

User Instructions




Important:
These User Instructions are to be provided to
the homeowner/end user upon product installation.
Each person installing or using this equipment mu
st 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.
2

TABLE OF CONTENTS
GENERAL SAFETY INFORMATION 3
Intended Use 3
List of Warnings and Cautions




3

USE INSTRUCTIONS AND LIMITATIONS



4
Use For 5
Do Not Use For





5
General Description 6
Features 6
Specifications 6

INSTALLATION AND OPERATION INSTRUCTIONS


7
Location 7
Installation 8
Power Up 10
Operation 10
Alarms 11
Reset/Silence Switch 12
Trouble Indicator 13
End-of-Life Indicator 13
Errors 13

MAINTENANCE 13
Testing 14
Field Test 14
Cleaning 14
Sensor Poisons 15

WARRANTY 16 3

GENERAL SAFETY INFORMATION
INTENDED USE
The GD-2B is a low voltage (9-32VDC, 12-24VAC) electronic detector of combustible, heating
type gases. The GD-2B is designed for connection to Fire Alarm/Burglary Control Panels. Alarm
control panels that work on 12 or 24 VDC can provide battery backup to the GD-2B detectors.
This combustible gas detector has been desi
gned for methane (natural gas) and propane (LP)
gas. It is NOT designed to detect sm
oke, fire or carbon monoxide.
LIST OF WARNINGS AND CAUTIONS



Each person using this equipment must r
ead 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 sens
or and detector are designed to monitor.
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 Macurco Technical
Service.


GD-2B may not function effectively below 32

F or above 120

F. Using the detector outside
of this temperature range may adve
rsely affect product performance and
result in sickness
or death
.


This detector helps monitor for the presence and concentration level of certain specified
airborne gases. Misuse may pr
oduce 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 supervisor or
User Instructions,
or call Macurco
Technical Service.


This product is intended for use in ordinary i
ndoor locations of family living units and office
workspaces. The GD-2B is not designed to m
easure compliance with Occupational Safety
and Health Administration (OSHA) co
mmercial or industrial standards. 4



When the unit is turned on it performs a self-tes
t, which activates the audible and/or visual
alarms. If the self-test fails, or all the alarms do not activate, do not use. Failure to do so
may adversely affect product performance and
result in sickness or death.



Immediately exit the environment if ther
e 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. Accommodat
ion spaces should be well ventilated when
household cleaning supplies or si
milar contaminants are used.


Do not cover or obstruct visual alarm LE
D. Doing so may adversely affect product
performance and
result in sickness or death
.


Do not disassemble unit or attempt to repair or
modify any component of this detector. This
detector contains no user serviceable parts, and substitution of components may adversely
affect product performance and
result in sickness or death.


CAUTION


Avoid the use of harsh cleaning materials, abr
asives and other organic solvents. Such
materials may permanently scratch the surfaces
, damage the sensor, labels or instrument
housing.


If you have any doubts about the applicability of t
he equipment to your j
ob situation, consult
an industrial hygienist or call
Macurco Technical Service.
USE INSTRUCTIONS AND LIMITATIONS

Each person using this equipment must r
ead and understand the information in these
User
Instructions
before use.

Use of this equipment by untrai
ned 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. 5

USE FOR
The GD-2B is an electronic detector of com
bustible, heating type gases (natural gas and
propane), designed for connection to alarm cont
rol panels. It can operate on 12 to 24 VDC
power from standby or interruptible panel power
, or be powered separately. The GD-2B is
intended for installation in buildings in non-haz
ardous locations such as residences, retail
stores, office buildings, and institutional buildings.

Use only for monitoring the gas which the sensor
and detector are designed to monitor. 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 Macurco Technical Service.
DO NOT USE FOR
The GD-2B is NOT intended for use in industrial
applications such as refineries, chemical
plants, etc. The GD-2B does NOT detect carbon monoxide. Do NOT mount the GD-2B in a
corner. The GD-2B is designed for connection to
Fire Alarm/Burglary Control Panels. Do not
connect the GD-2B to Fire Alarm Circuits, or Bu
rglar Alarm or other si
gnals. The Alarm Control
Panel must be dedicated to gas detection or have
alarm devices that prov
ide a distinctive alarm
for gas detection. Do NOT mount the GD-2B in kitchens or bathrooms - alcohol’s, ammonia,
cleaning solvents, paint thinner, gas
oline vapors, and aerosol propell
ants (aerosol cans such as
hair spray usually contain a combusti
ble gas) may cause nuisance alarms.


GD-2B may not function effectively below 32

F or above 120

F. Using the detector outside of
this temperature range may adver
sely affect product performance and
result in sickness or
death
.
6

GENERAL DESCRIPTION
The GD-2B is a low voltage (9-32VDC, 12-24VAC) electronic detector of combustible, heating
type gases, that has been calibrated for methane (natural gas) and propane (LP) gas. The GD-
2B is designed for connection to Fire Alarm/Burglary Control Panels. The GD-2B has a SPST
Alarm relay, for connection to control panels
or other devices. The GD-2B does NOT detect
carbon monoxide. The GD-2B has an
optional internal audible sounder.
Features


Designed to meet 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), natural gas (methane)


SPST alarm and trouble relays


Can be self-restoring or latching


10 year solid-state electronic sens
or: no maintenance or recalibration


Temperature compensated


Simple installation and operation


Supervised sensor
Specifications


Size: 3-1/8 x 5-1/8 x 1-3/4 in
ch (7.94 x 13.02 x 4.4 cm)


Shipping weight: 0.54 pound


Voltage: 9-32VDC, 12-24VAC


Current (non-alarm): 40 ma @ 12 VDC, 20 ma @ 24 VDC, 34 ma @ 12 VAC, 17 ma @ 24 VAC


Current (in alarm): 56 ma @ 12 VDC, 28 ma @ 24 VDC, 46 ma @ 12 VAC, 23 ma @ 24 VAC


Color: white


Sensor maintenance: not required


Alarm relay rating: SPST, 100ma, 40VDC


Trouble relay: SPST, 100ma, 40VDC


Operating temperature range: 32° to 120° F


Alarm set point: per UL 1484 (25% LEL) 7


INSTALLATION AND OPERATING INSTRUCTIONS

The following instructions are intended to serve as a guideline for the use of the Macurco GD-
2B Combustible Gas Detector. It is not to be
considered all-inclusive, nor is it intended to
replace the policy and procedur
es for each facility.


This detector helps monitor for the presence
and concentration level of certain specified
airborne gases. Misuse may produc
e 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 supervisor or
User Instructions,
or call Macurco Technical
Service.

LOCATION
A GD-2B is usually located in each room (exc
ept kitchens or bathrooms)
where there are gas
appliances or through which gas pipes pass. Do
NOT mount the GD-2B in a corner. Do NOT
mount the GD-2B in kitchens or bathrooms -
alcohol’s, ammonia, cleaning solvents, paint
thinner, gasoline vapors, and aeros
ol propellants (aerosol cans
such as hair spray usually
contain a combustible gas) may cause alarms.
Do NOT mount the GD-2B where the normal
ambient temperature is below 32° F
(0° C) or exceeds 120° F (50° C).


This product is intended for use in ordinary indoor
locations of family living units and office
workspaces. The GD-2B is not designed to meas
ure compliance with Occupational Safety and
Health Administration (OSHA) co
mmercial or industrial standards. 8

INSTALLATION
1.

If the gas used is natural gas (methane) mount the GD-2B on a wall about one foot down
from the ceiling. If the gas used is propane (LP), mount the GD-2B 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.

As shipped, the GD-2B faceplate is mount
ed on the enclosure's rear-housing component.
This enclosure configuration allows the unit
to be surface mounted flush on a wall. Wiring is
routed through an access area on the
base of the rear housing.
3.

A thin mid-plate enclosure component is also
supplied with the GD-2B. Using the supplied
screws, this mid-plate component is used to mount the GD-2B on a 2 x 4 inch (5.08cm x
10.16 cm) switch box - single-gang or "handy", provided by the installer. The GD-2B's
faceplate component (with the detector a
ttached) is then mounted on the mid-plate
component.
4.

Electrical connections to the GD-2B are made vi
a the supplied six-conductor pigtail cable.
The pigtail cable is first connected to the cont
rol panel wiring by means of wire-nuts (refer to
the diagrams for proper pigtail
wiring). The pigtail cable's connector then snaps into the
mating connector on the back of the GD-2B detector, allowing easy installation and
replacement of the GD-2B. For proper detec
tor operation, ensure that the GD-2B is
connected to a continuous source of power (not controlled by a wall switch). The GD-2B
current draw figures
represent worst-case
conditions and will not vary as the applied DC
voltage varies.
5.

The alarm control panel zone inputs must be term
inated with end of line resistors (E.O.L.R.),
which are provided with the panel.
6.

In the configuration, as shipped from the
factory, the GD-2B is used with normally open
initiating circuits. A jumper on the circuit
board can be removed to use the GD-2B with
normally closed initiating circuits. When usi
ng the GD-2B with normally closed initiating
circuits, remove the blue jumper labeled “ALARM
RELAY” on the top side the printed circuit
board under the buzzer. 9

7.

See wiring diagram for information below
on connections of the GD-2B. Macurco™
recommends a minimum of 22 AWG wire for r
uns up to 200 ft. (61 m), and 18 AWG wire for
longer runs.
8.

See wiring diagram and information below
for connections of the GD-2B.

9.

The alarm control panel zone inputs must be term
inated with end of line resistors (E.O.L.R.),
which are provided with the panel. The GD-2B has an
optional
internal audible sounder and
should be connected to a Fire Alarm/Burglary
Control Panel with an audible device that
provides at least 85 dB sound output. See
BUZZER option in the OPERATION section.
When the unit is turned on it performs a self-t
est, which activates the audible and/or visual
alarms. If the self-test fails, or all the alarms do not activate, do not use. Failure to do so may
adversely affect product performance and
result in sickness or death
.
10

OPERATION
1.

Once the GD-2B is operational (ARMED) the
green light will be on continuously. If gas is
detected the red LED (ALARM) tu
rns on and the SPST alarm relay
activates to indicate the
alarm condition.
2.

In the configuration, as shipped from the fact
ory, the GD-2B is self-restoring. When the air
clears of gas, the red light turns off and the relay switches to its normal state. A jumper on
the circuit board can be removed to allow the uni
t to latch in upon alarm. Once latched in,
power will need to be interrupted to un-latc
h the alarm condition.
The GD-2B can be
modified, either before or after installation, to have a latching output. Locate the blue jumper
labeled “
LATCH IN
” on the printed circuit board on t
he left hand side under the buzzer.
Remove this jumper and the unit will stay in
alarm (once gas has
exceeded the pre-set
threshold) until the power is interrupted.
3.

In the configuration, as shipped from the fa
ctory, the GD-2B has an
internal audible sounder.
A jumper on the circuit board can be removed to
disable the internal
audible sounder. If the
jumper on the circuit board is removed the GD-2B should be connected to a Fire
Alarm/Burglary Control Panel with an audible
device that provides at least 85 dB sound
output. The GD-2B can be modified, either before or
after installation, to disable the internal
audible sounder. Locate t
he blue jumper labeled “
BUZZER
” on the printed circuit board on
the left hand side under the buzzer. Remove this
jumper to disable
the internal audible
sounder.
4.

In the configuration, as shipped from the
factory, the GD-2B is used with normally open
initiating circuits. A jumper on the circuit
board can be removed to use the GD-2B with
normally closed initiating circuits. When usi
ng the GD-2B with normally closed initiating
circuits, remove the blue jumper labeled “
ALARM RELAY
” on the top side the printed circuit
board under the buzzer.

11

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 configur
ation of the control panel, with the GD-2B only
switching its relay to actuate the panel. Do not connect the GD-2B to Fire Alarm Circuits, or
Burglar Alarm or other
signals. The illumination of
the red (ALARM) light
on the GD-2B indicates
the alarm condition. When an alarm occurs i
mmediately 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. Accommodati
on spaces should be well ventilated when
household cleaning supplies or si
milar contaminants are used.
In addition to the methane (natural gas) and propane
(LP) gas that it is designed to detect, the
GD-2B 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, and
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 al
arms due to normal use of household products.
RESET/SILENCE SWITCH
The switch on the front of
the GD-2B labeled “TEST/RESET,”
performs four functions.
1.

A short press of the bu
tton (less than 5 seconds) will place
the unit into self-test mode with
no alarm relay activation. The buzzer will sound for two complete alarm cycles, the LED will
turn red for 5 seconds and then it will alternate between green and amber every second 12

while the self-test executes. About a minute after entering in self-test mode software will
simulate an alarm condition. When this happens, the LED turns red and the buzzer will
sound two complete alarm cycles. The unit will then return to normal operation.
2.

Pressing and holding the button will cause the buzzer to sound for two complete alarm
cycles and LED turns red for 5 seconds and then to solid amber for 30 seconds. The alarm
relay is activated during the 30 seconds while LED is solid amber. Button can be released
once the solid amber is displayed. 30 seconds after entering self-test mode the alarm relay
will turn off and the LED will alternate betw
een green and amber every second while the self-
test executes. About a minute after entering self
-test mode software will simulate an alarm
condition. When this happens, the LED turns red and the buzzer will sound two complete
alarm cycles. The unit will then return to normal operation.
3.

If the GD-2B is in an alarm condition due to the detection of combustible gas, one push of
the switch will cause the alarm buzzer to mute fo
r five minutes. After the five-minute period, if
gas is still present, the status light will again sw
itch to RED, the alarm relay will close and the
buzzer will sound. If after the five-minute per
iod, the detected gas
level has dropped below
25% LEL the GD-2B unit will reset unless it is latched in. See LATCH IN option of
OPERATION section.
4.

If the GD-2B is at the end of
its ten year life the TEST
/RESET switch can be used to
temporarily silence the buzzer function.
See section "End-of-life Indicator".
TROUBLE INDICATOR
Internal failure of the GD-2B will cause an
open circuit in the norma
lly closed (NC) Trouble
Relay to provide for actuation of the control panel
circuits. The status LED will flash AMBER and
the GD-2B buzzer will emit a short “chirp” (i
f the BUZZER is enabled) every 50 seconds. See
ERRORS section. The GD-2B microprocesso
r continuously monitors various detector
parameters. Failure of the GD-2B’s internal power
supply or a lack of power to the detector will
result in the status light remaining OFF (not
illuminated). In this case, the most common cause
of detector trouble would be a break in the
wiring between the control panel and the GD-2B. 13

END-OF-LIFE INDICATOR
Ten years after the GD-2B is installed the end-of
-life signal will be activa
ted indicating that the
GD-2B 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 prov
ide actuation of the
signal circuits. The status LED will flash al
ternate AMBER and OFF every 2 seconds and the
GD-2B buzzer will emit a short "chirp" ever
y 50 seconds (if the BUZZER is enabled). The end-
of-life buzzer can be silenced for 48 hours by pr
essing the "TEST/RESET" bu
tton. The silencing
of the buzzer also resets the Trouble Relay to
the Normally Closed (NC) position. The silence
function will continue to be available for 29 da
ys after the GD-2B initiates an end-of-life signal.
After this 29 day period the GD-2B can
no longer be silenced and must be replaced.
ERRORS
The GD-2B continuously monitors various internal
operating parameters. If a problem is found,
the unit will switch to Trouble mode. See TROUBL
E INDICATOR section. To reset the unit for
normal operation, press the TEST/RESET switch,
or remove power to the unit, wait a few
seconds, then re-apply unit power.
If this problem persists, your
detector may require repair.
Contact the alarm panel installer or Macurco
Tech Support for advice. If repair is required,
return the unit to manufacturer to comply with warranty.

Do not cover or obstruct visual
alarm LED. Doing so may ad
versely affect product performance
and
result in sickness or death
.
MAINTENANCE
The GD-2B 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-2B are to be performed
by Macurco. Macurco does not sancti
on any third-party
repair facilities. 14


Do not disassemble 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.
TESTING
The GD-2B should be tested monthly by pushi
ng the TEST/RESET switch; see TEST/RESET
switch section. Normally this will be the
only test required for
the GD-2B and is the
recommended way to test the unit or units afte
r installation. All GD-2B units are factory
calibrated and 100% tested for proper
operation. The unit also ha
s the ability to automatically
self test and does so every 2 1/2 minute cycle. If the unit detects an improper voltage or
inoperable component it will def
ault into Trouble mode. See TR
OUBLE INDICATOR section.
Check that the GD-2B status i
ndicator light is illuminated, (G
REEN) continuously. If not, do not
proceed with the tests. Though there is no field
calibration procedure for this unit, there is an
optional gas test procedure.

GAS TEST
Once the unit is fully operational
(the green light is on steady), test the unit by directing gas from
an unlighted butane ci
garette lighter into the detector throug
h 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 unl
it cigarette lighter, as detailed above.
CLEANING
The GD-2B should be cleaned using the soft brush
attachment of your vacuum cleaner. The
GD-2B should be tested after cleaning to ens
ure the unit is operating normally. 15

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 deteriorate if it is exposed to a direct spray from
aerosols such as paints, silicone
vapors, etc., or to a high densit
y of corrosive gases (such as
hydrogen sulfide, sulfur dioxide)
for an extended period of time.














16

LIMITED WARRANTY
The Macurco GD-2B Combustible Gas Detector is
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 a
ttempted, or that have
been subjected to abuse, accidental
or otherwise. The above warranty is in lieu of all other
express warranties, obligations or li
abilities. THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR PARTI
CULAR PURPOSE ARE LIMITED TO A
PERIOD OF TWO (2) YEARS Macurco shall not be
liable for any incident
al or consequential
damages for breach of this or any other warranty ex
press or implied arising
out of or related to
the use of said equipment. Manufacturer or its
agent’s liability shall be lim
ited to replacement or
repair as set forth above. Buyer’s sole and excl
usive remedies are return of the goods and
repayment of the price, or
repair and replacement of non-
conforming goods or parts.


Manufactured by Aerionics, Inc.
Sioux Falls, SD
Email: info@aerionicsinc.com
Phone: 1-877-367-7891
Rev 04.06.2015
© Aerionics 2015. All rights reserved.
Macurco is a trademark of Aerionics, Inc.


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