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Battery replacement
De-passivation
Safety notes on
lithium batteries
M-Bus connection
Technical data
Building Technologies
HVAC Products
as a confirmation. The result would be an erroneous display when showing the remain-
ing capacity.
First, remove the discharged main battery and insert the new one. Press the blue
DISPLAY button once to start the life expectancy calculation for the new main battery.
The backup battery MUST NOT be removed simultaneously. A fatal loss of data would
happen.
After storing the main battery for longer periods, especially at temperatures higher than
30 °C, the battery might passivate. Under these circumstances it will not be able to
deliver sufficient energy to the network node. If the network node detects a passivated
battery a de-passivation cycle is triggered. This is indicated by a flashing front LED.
The procedure might take a few minutes. After de-passivation the network node will
start up in IdLE mode. Low temperatures at the battery may cause a similar behavior
in other modes too.
The main battery used by the WTT16... requires careful treatment:
• Do not short-circuit or damage the battery
• Do not expose the battery to excessive heat
• Return exhausted batteries to the supplier
• Read the enclosed safety instructions carefully
Any network node can be connected to the M-Bus temporarily (service connector) or
continuously (screw terminal for the fixed M-bus connection). A plug for the screw ter-
minal is included with every network node.
Screw terminal for the fixed
M-Bus connection
max. 5 unit loads
M-Bus service connection
conformity to EMC directives
Safety class
Safety class
Electromagnetic compatibility
Operating voltage WTT16...
Lifetime of main battery
Operating voltage WTX16...
Rated frequency
Transmitter power
Frequency of transmission
Perm. ambient temperature
Transport and storage
Operation
Weight
Network Node WTT16..., WTX16...
MODE
RESET
IP32
2
immunity:
EN 55 024/EN 301 489
emissions: EN 55 022/EN 300 220-1
DC 3.6 V
> 5 years
AC 100...240 V, 50/60Hz
868.3 MHz
< 14 dBm
<1%
−20...+60 °C (< 30°C recommended)
0...55 °C
0.3 kg
7/8
CE1N2874en
14.07.2005
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