Elvaco CMa12w Quick Manual

a
CM
Indoor wireless M-Bus temperature sensor

IntroduCtIon

CMa12w is a 1-way wireless M-Bus communicating temperature
sensor for indoor use.
For a complete description of the product or for information in Swedish,
visit the Elvaco AB website, www.elvaco.com.

overvIew

mountIng

When mounting the CMa12w, avoid rooms with a lot of supplementary
heat, such as kitchens or south facing rooms. Position the sensor
away from direct sunlight. Avoid placing on an external wall or near an
external door. Make sure that the sensor is not positioned closer than
1 m from the nearest radiator and at least 1.5 m above the floor.
The CMa12w can be mounted directly on the wall, or over a mounting
box Ø70 mm. If the CMa12w is placed over a conduit pipe, it is
recommended to fill the pipe to prevent air flow which could affect
accuracy of the values.
Remove the rear cover to be able to press the installation button SW1
(2).
ImPortAnt
• Do not use mounting holes (4) as shown in overview.
• Turn the rear cover as shown in the overview.
• Do not mount the product inside a steel cabinet, which will
dramatically lower the possibilities to connect to a master.
• If the product should be demounted from the wall, use a
screwdriver to separate the product from the rear cover. The
screwdriver should be inserted carefully in the upper part of the
holes as shown in the figure at the top of next column.
12
w
1. LED 1
2. Push-button (SW1)
3. Serial number (secondary
address) and article number
4. Do not use for mounting

wIreless m-bus

The product is delivered with the radio turned off. The radio must be
manually switched on during the installation procedure. The product will
not be activated until the installation procedure is started.

InstAllAtIon

The product can be installed and enabled in two modes. Please advise
your project manager which operation mode is used in your project.
unencrypted mode: Meter data is sent unencrypted and no encryption
key is needed to decrypt the data.
1. Press and hold button SW1 (2) for 5-10 seconds, until LED1 (1)
flashes quickly.
2. Release SW1 (2)
encrypted mode: Meter data is sent in encrypted mode and an encryption
key is needed to decrypt the data.
1. Press and hold button SW1 (2) for 12-25 seconds, until LED1 (3)
flashes slowly.
2. Release SW1 (2).
Release SW1 for
unencrypted mode
LED1 fast flash
6 s 5 s 2 s*
* If the button is released in this mode, the Cma12w will return to inactive
mode. this also applies if the button is pressed down for longer than 25
seconds.
ImPortAnt
Make sure that the product is activated by pressing SW1 in normal
operation. If the product is activated in unencrypted mode, LED1 will
flash quickly 5 times. If the product is activated in encrypted mode,
LED1 will be illuminated for 1 second

oPerAtIon

The product will automatically, after the installation procedure, send
C1 messages every 180 seconds containing sensor data, such as
instantaneous temperature. The product will also send product status
information, containing battery status and other relevant information.
Release SW1 for
encrypted mode
LED1 slow flash
12 s