Maintenance and cleaning
Battery life
56
57
Smoke chamber pol-
luted (the information
is not transferred to
further smoke alarm
devices, but the status
information is send to
the Homematic Central
Control Unit (if installed))
3 x red flashing every 43 s
3 short signal sounds
every 43 s
Devices with weak or empty battery or degraded smoke chamber
may not be used and have to be replaced!
8.1 Duty cycle limit reached
The duty cycle is a legally regulated limit of the transmission time of
devices in the 868 MHz range. The aim of this regulation is to safeguard
the operation of all devices working in the 868 MHz range.
In the 868 MHz frequency range we use, the maximum transmission
time of any device is 1% of an hour (i.e. 36 seconds in an hour). Devices
must cease transmission when they reach the 1% limit until this time
restriction comes to an end. Homematic devices are designed and pro-
duced with 100% conformity to this regulation.
During normal operation, the duty cycle is not usually reached. However,
repeated and radio-intensive teach-in processes mean that it may be
reached in isolated instances during start-up or initial installation of a
system. If the duty cycle is exceeded, this is indicated by one long and
one short red flash of the device LED, and may manifest itself in the de
-
vice temporarily working incorrectly. The device starts working correctly
again after a short period (max. 1 hour).
9
Maintenance and cleaning
To ensure operational liability of the wireless smoke alarm the device
has to be maintained at least once a month. To do this, proceed as fol-
lows:
•
Wipe the housing with a slightly damp cloth if necessary.
•
Shortly press the operating button to perform a function test.
• If the alarm sound is triggered 3 times, the LED flashes red and the
escape light flashes at the same time, the wireless smoke alarm is
working correctly.
•
If no alarm sound is triggered or no visual signal can be detected, the
device is defective and has to be replaced.
10 Battery life
The wireless smoke alarm is powered by a permanently sealed lithium
battery with a typical lifetime of 10 years. Batteries cannot be replaced.
The battery life of typically 10 years can only be enabled under
the following conditions:
•
A max. number of 52 function tests and one alarm for 60 seconds
within the group may be performed per year.
•
During the entire lifetime, one start-up procedure and two range tests
may be performed and the device may be taught-in to a group once.
•
The potential interference of other radio transmitters in the 868 MHz
range may not be above 15 seconds per day.
•
The operating ambient temperature of +5° to +30°C has to be main-
tained.
11 General information about radio operation
The wireless system used operates in the 868 MHz band, which is also
used by other wireless services. This means that devices operating on
the same or an adjacent frequency can lead to restrictions in terms of
operation and range.
The specified range of at least 100 m is the open air range, i.e. the range
when the transmitter and the receiver can “see” each other. In practice,
however, there will be walls, ceilings, etc. between the transmitter and
receiver, which may reduce the range accordingly.
Other reasons for a reduced range can be:
•
All types of radio frequency interference.
