User Instructions

1
. the vent at the bottom. The cover will snap off exposing the electronics
a
nd mounting plate.
2
. For flush mount, remove the 2 screws and rear cover from the mounting
p
late and use the appropriate hole-pattern for installation. The four holes
t
oward the center of the mounting plate match the hole- pattern of a double
g
ang electrical box. The four holes near the corners match the pattern of a
f
our-inch square box. Mount the GD-2A so the “TOP” marked side of the
m
ounting plate is at the highest side. Snap the front cover back on when
f
inished, making sure that the lights line up with the access holes.
3
. When using the GD-2A with normally closed initiating circuits, use the
C
om. and N.C. alarm relay connections.
4
. See wiring diagram and information below for connections of the GD-2A.
•
UL 2075 Requirements - 12.4.1 Power supply leads provided for field
c
onnection shall not be less than 6 inches (152 mm) long, provided with
s
train relief, and shall be no smaller than 18 AWG (0.82 mm
2
). The
i
nsulation, when thermoplastic, shall not be less than 1/32 inch (0.8 mm)
t
hick.
•
Exception No. 1: A lead is not prohibited from being less than 6 inches
l
ong when it is evident that the use of a longer lead results in damage to the
i
nsulation.
•
Exception No. 2: Solid copper leads as small as 26 AWG (0.13 mm
2
) are
n
ot prohibited from use when:
A
. The current does not exceed 1 ampere for lengths up to 2 feet (61 cm)
a
nd the current does not exceed 0.4 ampere for lengths from 2 feet up to 10
f
eet (3.05 m);
B
. There are two or more conductors and they are covered by a common
j
acket, or the equivalent; and
C
. The assembled conductors comply with the requirements of the Strain
R
elief Tests, Section 18.
•
12.4.2 Leads provided for field connection to power limited signaling
c
ircuits, such as those employed for connection to remote signaling devices,
s
hall not be smaller than 16 AWG (1.3 mm
2
), for a single conductor; 19
A
WG (0.65 mm
2
) for two or more conductors; and 26 AWG (0.13 mm
2
) for
f
our or more conductors of a multi-conductor cable. The conductor shall be
s
olid, bunch tinned stranded, or stranded copper. Stranded copper wire
c
onsisting of not more than seven strands shall be employed only for 18
A
WG (0.82 mm
2
) and larger conductors.
5. 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.
6. 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.
7. The alarm control panel zone inputs must be termi
nated 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 UL Listed Fire
Alarm/Burglary Control Panel with a UL Listed audible device that provides
at least 85 DB sound output.
POWER UP
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. Afterwards, 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.
Failure to do so may adversely affect product performance and result in sickness
or death.
When power is first applied to the detector, it will go through a warm-up
perio
d of one and one half to two 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) afterwards to indicate the unit is in
normal operation.
OPERATION
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 al
arm relay activates to indicate the alarm condition.
2. 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 un-latch the alarm co
ndition.
• 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 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.
3. 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
switching on and off and the normally closed trouble relay opening. A power
failure also causes the trouble relay to open.
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 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 G
D-2A indicates the alarm
condition. When an alarm occurs immediately 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. Accommodation spaces should be
well ventilated when household cleaning supplies or similar contaminants are used.
In addition to the methane (natural gas) and pr
opane (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 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
alarms due to normal use of household products.
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. Fa
ilure 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.
Do not cover or obstruct visual alarm LED. Doing so may adversely affect product
performance and result in sickn
ess or death.
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.
Do not disassemble unit or attempt to repair or modify any component of this
instrument. This instrument contain
s 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
Once the unit is fully operational (the green light is on steady), test the uni
t
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 t
o
hold the lighter valve open for several seconds. The red light (ALARM) will
turn on, the alarm relay switches, and any devices connected shoul
d
activate. The detector should be tested regularly by using gas from an unlit
cigarette lighter, as detailed above.
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.
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 deteriorat
e
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 hydroge
n
sulfide, sulfur dioxide) for an extended period of time.
LIMITED WARRANTY
The Macurco GD-2A Combustible Gas Detector is warranted to be free fro
m
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 o
f
charge, if the unit is returned in accordance with the instructions below. Thi
s
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 o
r
liabilities. THE IMPLIED WARRANTIES OF MERCHANTABILITY AN
D
FITNESS FOR PARTICULAR PURPOSE ARE LIMITED TO A PERIOD O
F
TWO (2) YEARS Macurco shall not be liable for any incidental or
consequential damages for breach of this or any other warranty express o
r
implied arising out of or related to the use of said equipment. Manufacturer
or its agent’s liability shall be limited to replacement or repair as set forth
above. Buyer’s sole and exclusive remedies are return of the goods an
d
repayment of the price, or repair and replacement of non-conforming good
s
or parts.
Manufactured by Aerionics, Inc.
Sioux Falls, SD
Email: [e-mail]
Phone: [phone]
Rev 03.10.2014
© Aerionics 2014. All rights reserved.
Macurco is a trademark of Aerionics, Inc.
TYPICAL COVERAGE - 900 SQUARE FEET
TYPICAL CONNECTION OF TWO GD-2A TO AN ALARM CONTROL PANEL
! WARNING
! WARNING
! WARNING
! WARNING
! WARNING