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40 seconds for up to 15 minutes. Press the test button to
cancel hush mode beeps.
(iii) The cells may be depleted. The beeps should cease
within 2 hours as they charge up. Fully charged, the cells will
provide up to 6 months back-up without mains power.
(iv) On the Optical Smoke Alarms only (Ei156TLH) if the
unit beeps and the red light does not flash at the same time
it indicates a problem with the smoke chamber - see Cleaning
the Smoke Alarm.
If all of the above possible causes of beeps have been ruled
out but the beeping has still persisted for over 2 hours with the
green light on - the rechargeable cells are probably defective.
The Smoke Alarm must be returned to the manufacturer for
repair or replacement (see section Getting Your Alarm
Serviced).
2. Manual Testing
2. We recommend that the functioning of the rechargeable
cells is checked periodically (at least yearly) as follows:
(i) Ensure that the alarm has been connected to the mains,
green light on, for a least 2 days for the cells to charge.
(ii) Turn off the mains power at the distribution board and
check that the green indicator light is extinguished. Do not
remove the plug from the rear as this will disconnect the cells.
(iii) Press the test button and ensure the horn sounds loudly
for 10 seconds.
(iv) Release the test button and watch it carefully for one
minute:
• The red light behind the test button or on the cover will
flash at least once.
• The unit must not give a beep which indicates the battery
is low.
(v) Turn on the mains supply at the distribution board only if
the unit passes all the above tests.
Note: If the mains is disconnected and the battery is almost
depleted the unit will beep every 40 seconds for at least 72
hours. This is to remind you to re-connect the mains supply.
The unit will operate from the mains alone, even with a fully
depleted or a defective battery, though it may not give
sufficient warning of fire if the mains supply is disconnected
for any reason.
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