SMD-426, SMD-427
24 D-302758
In small rooms less than 25 cubic meters (883 cubic ft.) in size, a small amount of smoke may activate
a smoke alert. For example, smoking or bathroom steam may activate a smoke alert.
Figure 8. Recommended Smoke Detector Locations to Avoid Air Streams with Combustion Particles
WARNING: Never remove batteries to stop a false alarm. Open a window or fan the air around the detector to
get rid of the smoke. The alarm will turn itself off when the smoke is gone. If false alarms persist, attempt to
clean the detector as described in this manual.
WARNING: Do not stand close to the detector when the alarm is sounding. The alarm is loud in order to wake
you in an emergency. Too much exposure to the horn at close range may be harmful to your hearing.
3.4 Audible and Visual Indications
The dual color LED and buzzer are used to signal various alarm and trouble messages as shown in Table 1
below:
Table 1. Visual and Audible Indications
Visual Indication (LEDs)
Condition
Red Yellow
Audio
Indication
Smoke alarm Flash every 500ms - 3 long beeps every 4 sec.
Heat alarm(***) Flash every 500ms - Long beep every 2 sec.
Tamper alarm(*) - - Long beep every 2 sec.
Standby Flash every 30 sec. - -
Low battery Flash every 30 sec. - Short beep every 30 sec.
Smoke sensor trouble Flash every 60 sec. 3 Flashes every 60 sec. Short beep every 60 sec.
Low sensitivity alarm Flash every 30 sec.(**) - Short beep every 30 sec.
Heat sensor trouble(***) Flash every 60 sec. 5 Flashes every 60 sec. Short beep every 60 sec.
Need to clean 2 flashes every 30 sec. - 2 short beeps every 30 sec.
Test See par. 6.1
* The tamper alarm will mute for 3 minutes at first power on, and will revert to normal mode when the tamper
switch condition is changed.
** Delay of 15 sec. between buzzer beep and LED operation
*** SMD-427 only
3.5 Battery Connection and Initial Test
Attention: The detector battery cover is fitted with a red button that prevents the detector from locking onto
bracket if there is no battery inside.
The smoke detector is supplied with a 3V CR123A / CR17450 battery. Battery connection for both types of
batteries is illustrated in Figures 9a and 9b below.
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