User’s manual NX-4a Side 9
Wiring an additional alarm sounder
An additional alarm sounder may
be required if NX-4 is far away
from the bed or if the residents
have reduced hearing.
Any 12V type buzzer/sounder can
be connected as shown. The max
capacity of this output is
approximately 10-15mA. Use 12V
sounders also in 24V systems. A
sounder connected to this output
will also be adjusted in volume
together with the internal sounder.
(Connector J3 pin 1 is a 12V
power output that can be used for
both 12V motion detectors and the alarm sounder).
Wiring external outputs with relay
This is an example of how to wire the external outputs to heavy loads that not can be connected
directly to NX-4´s outputs. The wiring will be the same for all outputs at J2 pin1, 2 and 3. It is also
possible to combine these outputs by connecting them together.
The example shows an external alarm horn connected to the “Gas combined” output. A similar circuit
can be used for a shutting valve at the propane bottle controlled by the “propane” output.
Note: These outputs are not fused and will be destroyed if over loaded.
Maintenance
No particularly maintenance is required, but regularly readjusting of the gas detector sensitivity is
recommended. This will ensure proper function and avoid false alarms.
Do a full function test once a year as described in the chapter “How to test NX-4”.
If NX-4 is used constantly, we recommend sending the unit for service and possible sensor
replacement after approximately 6-7 years.
If NX-4 has been exposed to high air humidity or left OFF for a longer period of time, it may be
required to leave it ON for a day or two in order to attain normal sensitivity.
If outside motion detectors are used, they have to be cleaned on regular basis. Clean with a cloth and
mild soap water. Avoid flushing directly at the detectors.
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