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OWNER'S MANUAL
NG401, NG401A
(12 Volt DC)
NG405 - NG405A
(12 Volt AC)
Natural Gas Detector
(12 Volt Hard-Wired with Optional
Relay Output)
Introducing the NG401, NG401A,
NG405, NG405A Natural Gas
Detector
The NG401, NG401A, NG405, NG405A
Natural Gas Detector is an effective product
for detecting any buildup of natural gas in your
home. Dicon Global Inc., the maker of these
natural gas detectors, has been developing
and making products for detecting gases since
1985.
Your new detector:
Is easy to install
Monitors for natural gas continuously and
sounds a loud (85db) alarm when it
detects a build-up of natural gas.
Has a Test button so that you can test it
at any time.
Tests itself continuously.
Is listed by the Underwriters Laboratories
to UL1484 standard.
Has a 5-year guarantee for the natural
gas sensing element.
A. Why should you be concerned
about natural gas?
The harmful element in natural gas is
methane, a colorless, odorless, and flammable
gas. As natural gas builds up, it mixes with
oxygen to produce a mixture that can be
explosive if ignited by a spark or flame.
Most likely sources of leaks are gas appli-
ances, heaters, stoves, refrigerators, and fur-
naces. Gas leaks from outside or below
groundlevel can also seep into your home.
B. Where should you install the
detector?
Natural gas is lighter than air and therefore
collects in the highest areas of rooms and
homes. To detect a dangerous concentration
of natural gas, you should place your detector
near a natural gas appliance or in a room
above the appliance. For example a natural
gas leak in the kitchen can create a build up in
the floors above.
You should place your detector as close to the
ceiling as possible.
C. How should you install the
detector?
You must install the NG401, NG401A, NG405,
NG405A Natural Gas Detector on a wall within
36 inches of the ceiling.
To install the detector:
1. At the place where you are going to
install the detector, draw a horizontal line four
inches long.
2. Place the circular mounting plate so that the
square holes are aligned on the line.
3. In each of the circular slots. Draw a mark to
locate a mounting plug and screw.
4. Remove the mounting plate.
5. Using the appropriate size drill, drill two
holes at the marks and insert wall plugs.
6. Using the two screws and wall plugs
(all supplied), attach the mounting plate to the
wall ensuring that the cord slot in the mounting
plate is down.
7. Slide the detector onto the mounting plate
so that the two arms on the mounting plate fit
into two slots in the back of the detector.
8. Ensure that the detector's 12 Volt wires
are located in the cord slot or behind the
detector in an appropriately recessed area.
9. Give the detector a short counter-clockwise
twist to lock the detector in place. If the detec-
tor is not horizontal, you can remove it, re-
adjust the mounting plate, and re-install it until
it is horizontal.
10. Connect the 12 Volt source using the two
connectors supplied.
11.(Models NG401A and NG405A only) con-
nect the three relay output wires (from the
back of the detector) using the connectors
supplied.The relay output wires have the fol-
lowing connections and are labeled as such:
the black wire is common
the red wire is from the normally-open
contact.
the green wire is from the normally-closed
contact
Note: Steps 10 and 11 must be preformed
by qualified service personnel only.
Ensure that any wires not connected are insu-
lated with a connector (supplied).
Wait for ten minutes before you test the detec-
tor. During that time, the alarm may sound
several times and the yellow (malfunction)
lights may light up once or twice as the detec-
tor cleans the sensor. This will also occur if the
power to the detector is interrupted.
D. How can you test the detector?
To test the detector, wait at least ten minutes
after installing it, press the test button. The
alarm sounds.
To reset the alarm, turn the 12 Volt supply off,
wait ten seconds, then turn it on again.
The detector continually checks itself. If it finds
a malfunction, it lights the yellow light. If this
occurs, call Dicon Global Inc. at 1-800-387-
4219.
E. How can you maintain your
detector?
A detector is only useful if it works. To keep it
working, all you need to do is:
vacuum the air vents occasionally to keep
them free of dust.
test the detector by pressing the test button
once a month.
F. What do the lights mean?
The detector has three lights:
Green (Power) light:
This lights up when the detector has power. It
is normal for this light to be on while the detec-
tor is powered.
Red (Alarm) light:
This lights up when the alarm sounds. It is nor-
mal for this light to turn on when you press the
Test button.
Yellow (Malfunction) light:
This lights up when a detector finds a malfunc-
tion while it is checking itself. It is normal for
this light to turn on once or twice after you
power the detector or after a power failure.
EVACUATE IMMEDIATELY!
Do a head count to check
that everybody is accounted
for. Call the nearest fire
department and ask them to
determine the source of nat-
ural gas. Do not re-enter the
premises until the problem
has been corrected and the
natural gas has been dis-
persed.
WARNING: Activation of
this device indicates the
presence of natural gas,
which is flammable and can
be fatal. The source of the
gas may be an object such
as a furnace, a hot water
heater or other natural gas
appliance.
This detector will only indi-
cate the presence of natural
gas near the detector.
Natural gas may be present
in other areas. Correction of
the problem may require the
services of a local natural
gas utility company or con-
tractor.
H. What do you do after the prob-
lem has been corrected?
On re-entering the premises after an alarm:
1. Turn the 12 Volt supply off for ten seconds,
and then turn it on again.
2. After ten minutes (during which the alarm
may sound once or twice and the yellow
light may flash), test the detector to make
sure that the detector is working properly.
I. Technical Information
Your NG401, NG401A, NG405, NG405A
Natural Gas Detector uses a sensing technolo-
gy that enables the detector to sound an alarm
before the concentration of gas reaches 25%
of the Lower Explosive Limit (LEL).
Exposure times
The natural gas concentrations standard for
the alarms has been set by the Underwriters
Laboratories Inc. to be less than 25% of the
LEL. Therefore your unit will alarm immediate-
ly upon detection of dagnerous levels.
J. Warranty Information
Limited Warranty
Dicon Global Inc. warrants its enclosed Natural
Gas Detector sensor to be free from defects in
material and workmanship under normal use
and service for a period of five (5) years form
date of purchase. Dicon Global Inc. warrants
it's enclosed Natural Gas Detector other than
the sensor to be free from defects in materials
and workmanship under normal use and serv-
ice for a period of one (1) year from date of
purchase. Dicon Global Inc. makes no other
express warranty for this Natural Gas Detector.
No agent, representative, dealer or employee
of the company has the authority to increase
or alter the obligations or limitations of this
Warranty. The company's obligation of this
warranty shall be limited to the repair or
replacement of any part of the detector which
is found to be defective in materials or work-
manship under normal use of service during
the first year period commencing with the date
of purchase except for the sensor which is
warranted during the five year period com-
mencing with the date of purchase. During the
latter four (4) years of the warranty period,
such repairs or replacements other than the
sensor itself, shall be made at a charge to the
customer not to exceed the manufacture's
cost. Units in need of repair should be
returned to Dicon Global Inc. prepaid. Please
call 1-800-387-4219 for shipping instructions.
The company shall not be obligated to repair
or replace units which are found to be in need
of repair because of damage, unreasonable
use, modifications, or alterations occurring
after the date of purchase. The duration of any
implied Warranty, including that of mer-
chantability or fitness for any particular pur-
pose, shall be limited to the period of one (1)
year on the detector and five (5) years on the
sensing unit commencing with the date of pur-
chase. In no case shall the Company be liable
for any consequential or incidental damages
for breach of this or any other warranty
expressed or implied whatsoever, even if the
loss or damage is caused by the Company's
negligence or fault. Some states do not allow
the exclusion or limitation or incidental or con-
sequential damages, so the above limitations
or exclusion may not apply to you. This war-
ranty gives you specific legal rights, and you
may also have other rights which vary from
province to province.
Dicon Global Inc.
20 Steelcase Road West, Unit 3
Markham, Ontario, Canada L3R 1B2
IMPORTANT:
NOT SUITABLE AS A CARBON MONOXIDE
DETECTOR OR A SMOKE OR FIRE
DETECTOR. THIS DEVICE IS NOT SUIT-
ABLE FOR INSTALLATION IN A HAZ-
ARDOUS LOCATION, AS DEFINED IN THE
NATIONAL OR CANADIAN ELECTRICAL
CODE.
G. What should you do if the
ALARM sounds?
2502-A0066
Specifications
Power Supply Input Ratings
Models NG401 and NG401A: 12V DC, 600mA
Models NG405 and NG405A: 12 V AC, 600 mA
Optional Relay Output Ratings
Models NG405 and NG405A: class 2 output only
30 V DC 1 A
Dimensions 6.5” x 3.5” x 1.375”
16.5cm x 8.9cm x 3.5cm
Normal Operating Conditions:
Temperature 4.4°C (40°F) to 37.8°C (100°F)
Gas Detection Level less than 25% LEL
of natural gas
Lights Power (green)
Alarm (red)
Malfunction( yellow)
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Owner’s Manual / Guide d’utilisation
Models / Modèles NG401 and NG401A
z12 V DC / 12 V c.c.
Models / Modèles NG405 and NG405A
z12 V AC / 12 V c.a.
Models NG401A and NG405Aare equiped
with a Class 2, 30V DC/1A realy output
Les modèles NG401A et NG405Asont fournis
avec un relais de sortie de 30 V c.c./1 Ade classe 2
IMPORTANT: This manual must be read, followed
and kept for future reference.
IMPORTANT: ce guide doit être lu, suivi et gardé
en lieu sur pour consultationr ultérieure.
(Français au verso)
Drilled hole,
plugged
Horizontal line
Screw hole
mark
Horizontal line
Test Button
Power LIght - Green
Alarm Light - Red
Horizontal line
Power
Alimentation
Alarm
Alarme
Malfunction
Défaillance
Test/
Essai
TM MC
Malfunction Light - Yellow