User’s manual NX-4a Side 5
False alarms
The “Narcosis” gas detector is sensitive to alcohol. It is normal that it will react if alcohol is handled
near the NX-4. If you are breathing on the NX-4 after consuming alcohol, it shall react.
NX-4 will normally react on the propellant gas in most spray boxes.
Smokers may experience alarms even if they are not smoking at the moment. This is because the air
quality is generally lower than normal and a small added pollution could be enough to trigger the
alarm. If so, a lower sensitivity setting or added ventilation may be required.
The smoke detector is very sensible to car exhaust so if NX-4 is ON while driving in tunnels or close
behind other cars, it may react. However, this should not be a problem because NX-4 is to be shut off
while driving. It does not harm anything to have it ON, but it has no purpose and if outside lights are
connected, it will come on all the time.
The motion detectors will react on anything hotter than the background as long as it moves. That
includes pets, sunlight behind a branch moving in the wind, warm gusts and humans. This will cause
the light to come on (if equipped), but no alarm will sound at this point. If the motion in the detection
zone persists for a certain amount of time, the alarm will sound. This will filter out most false
detections, but if false alarms occur, you can reduce the sensitivity. More detectors create more (false)
detections and requires lower sensitivity). False detections lights the outside light, but that should not
bother anyone because nobody will know. (See the chapter “Adjusting the sensitivity for the motion
detectors”).
Installation
Install NX-4 main unit approximately 1,5-2m above the floor in a free and open place in the living
area where it is easy to reach. Do not install it inside a sleeping place or inside lockers. Be aware that
NX-4 will detect alcohol fumes from opened bottles with drinks containing alcohol. Avoid placing
NX-4 close to bar lockers if possible.
NX-4 will react on “spent air” human breath with alcohol, human “exhaust” so if the ventilation is
poor, this may create “false “ alarms. This is why NX-4 should not be installed to close to bed sites. If
possible it is convenient to install it on the wall close to the electric distribution center or at the side of
a locker going from floor to roof. Then it is convenient to route the wire for the propane detector (and
the other wires) inside the locker .
Remove the four screws retaining the front of the unit.
Attach it to the wall with two screws trough the holes
shown. Drill holes for wires in the wall where the larger
holes in the unit bottom is located. If the wires shall not
go trough the wall, drill holes in the side of the NX-4
cabinet for wires. When all wires are connected, reinstall
the front. Be careful not to bend the red indicator lamps
in the process.
Install the propane sensor approximately 10-15 cm above the floor. The location is not critical. Install
it with a screw through the smallest hole in the aluminum housing. Route the wire to NX-4 and cut off
the excessive cable.
If external outside lamps are not used, NX-4 can be powered from almost any circuit. There will not
be any particular requirements for the wire gauge or power capacity. The power requirement for NX-4
is only 2,4W.
If Outside lamps are connected, NX-4 must also carry the load for the lamps. The power circuit should
have a 15A fuse and have at least 1# wire gauge. If outside lamps are less powerful, you can replace
the internal lamp fuse FU1 with a smaller one in order to power NX-4 from a circuit with less
capacity. The power circuit capacity must always be grater than the internal lamp fuse FU1! This way
NX-4 will not be disabled by broken fuse if the lamps are short circuited from the outside.
We recommend powering NX-4 from a circuit that is switched off by the main switch for the living
area.
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