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The ST-622 multi-criteria high performance detector is the ultimate alternative to traditional alarms . Groundbreaking Thermoptek technology combines the very latest in optical sensing with thermal enhancement, providing faster response to both fire types eliminating the need for ionisation sources which can be harmful to the environment. In addition, this smoke alarm allows the low battery warning chirp to be silenced until it is convenient to replace the alarm (recommended within no more than 7 days).


Normal condition

The red LED on the front should flash every 40 seconds to show that the alarm is active.

Low Power Pack Condition

IMPORTANT: Your smoke alarm requires the power pack to have sufficient capacity of power to operate correctly.

Should your smoke alarm enter a low power pack condition, the unit will emit an audible ‘chirp’ once every 40 seconds. When this occurs, we recommend you replace the alarm immediately. Your smoke alarm will continue to warn of this low power pack condition for at least 7 days, however, failure to change the alarm after this time would mean your smoke alarm may have insufficient power to alert you in a real fire situation. When the alarm is removed from the base plate the power pack will automatically deactivate and the low power warning chirp should stop, allowing you to dispose of the alarm.

Low Battery Warning Silence

This feature can temporarily silence the low battery chirp for 8 hours which is particularly useful if the warning begins during the night. This feature may be repeated up to 10 times, but is not a substitute for replacing the smoke alarm.


The alarm must be properly attached to the base plate before it can be tested.

a) Press the test button in the centre and release.

Test the unit

b) The unit will give an audible alarm consisting of 2 cycles of 3 loud beeps, then stop automatically.

Test the unit

Test the unit

c) The red LED on your alarm will flash rapidly during the audible signal.

Test the unit

NOTE: The test button accurately tests the alarm’s smoke sensing circuit, there is no need to test your alarm with smoke. If your smoke alarm fails to give an audible test signal, please refer immediately to the trouble shooting guide at the end of this manual.

WARNING: You should test your smoke alarm every week.


DANGER: If your smoke alarm emits the full alarm signal and you are not testing the unit, the smoke alarm is warning you of a potentially dangerous situation that requires your immediate attention. Only use the alarm silence function after making sure that there is no ongoing fire emergency situation. Do not block the vents on the alarm or disable the smoke alarm in any way, as this will remove your protection. Smoke alarms can sometimes react to cooking fumes or other non emergency situations. Your smoke alarm features “Smart Silence” technology. In the event of a known false alarm your smoke alarm can be temporarily silenced by pressing the central test button. Your alarm will automatically return to full sensitivity within 10 minutes.

NOTE: If the level of smoke reaching the alarm is very high the alarm silence will be overridden and the alarm will continue to sound.

a) Press and release the silence button, the alarm sound will shortly stop.

Test the unit

b) Your alarm will silence and enter into a reduced sensitivity reset cycle for approximately 10 minutes.

Test the unit

Test the unit

c) During the reduced sensitivity reset cycle, the red LED on your alarm will continue to flash more rapidly than normal, approximately once every second.

Test the unit

d) Your alarm will automatically return to full sensitivity on completion of the reset cycle and the red LED will revert to flashing once every 40 seconds.

Test the unit

Test the unit

DANGER: Never ignore any alarm. Ignoring the alarm may result in injury or death. If your smoke alarm activates and alarms and you are not absolutely certain of the source of the smoke, get everyone out of the house immediately.


Low battery warnings often start at night or when it maybe inconvenient to replace your alarm. You can silence the audible chirp for a period of 8 hours by pressing the test button. Your smoke alarm will still detect smoke during this time of low battery warning silence. However it is recommended that you replace your alarm immediately, and certainly within 7 days, as your alarm may then have insufficient power to warn you of a real fire situation after this time.

WARNING: Your smoke alarm cannot be silenced if the chirp is indicating a fault. In this instance, the unit should be replaced immediately to ensure protection in the event of a fire.


Your smoke alarm has been designed to be as maintenance-free as possible, however there are several things you must do to keep it working properly.

CAUTION: Your smoke alarm is a sealed electrical device and no attempt should be made to open the case. Attempting to open the case will invalidate your Warranty.


Test your smoke alarm once every week see ‘AlarmTest’. Any test failures should be reported to the Technical Support Team.


As a minimum your smoke alarm should be cleaned once every 3 months using your vacuum cleaner fitted with the soft brush attachment.

Test the unit

WARNING: Your smoke alarm may false alarm when it is being cleaned using a vacuum cleaner.

IMPORTANT: Do not use solvents or cleaners on your smoke alarm, as they may cause damage to the sensor or circuitry. The unit can be wiped with a slightly damp cloth.

CAUTION: Do not paint the smoke alarm as this may block the openings and prevent smoke from entering the sensor.


Your smoke alarm does not sound during testing

Your smoke alarm chirps intermittently

Your smoke alarm activates when no smoke is visible

The low battery warning silence chirp does not silence when the test button is pressed

You experience frequent unwanted alarms

If you have any questions, please contact the Technical Support Team between 9am - 5pm Monday – Friday. Telephone: 0800 141 2561 or e-mail: You can also visit the support section of our website

The full user manual can be downloaded here.

Top Copyright © 2006 - 2017 by Ian Pawson

Page last modified: 22nd January 2016 10:53:03