Gewiss GW 20 490 Bedienungsanleitung Seite 18

To avoid these inconveniences, it is recommended to choose the best possible position when installing the
siren, testing the quality of the signal received from the control unit, before drilling it into the wall.
Recommended and
non-recommended
installation positions
Examples of installation positions for external sirens and infrastructures which can disturb the wireless frequencies
Useful advice:
• choose the most suitable place to install the siren, taking into consideration the visibility from the access road
to the house and possibility of tampering, then send a signal to the siren from the control unit to test the quality
of reception.
• If the quality of the signal is not sufficient, move the siren to a position which must still guarantee visibility and
difficulty in accessing the unit.
• Repeat the procedure until you find the most suitable place and then install it on the wall.
• To make it easier to find the best installation position for the siren, you can use the specific instrument mod.
TV/LY, designed to test the quality of AM signals.
GOOD
POSITION
CEILING
GW 20471
CONTROL
UNIT
GOOD
POSITION
GOOD
POSITION
18
GUTTERING
DISTURBED FIELDS DUE TO :
- METAL COMPONENTS IN THE
REINFORCEMENTS USED ON
THE CEILING AND LOFT.
- COPPER GUTTERING AND
DRAINPIPES
GW 20490