LF20WU - Audio fire alarm device

Audio fire alarm device

  • Power supply from 18V d.c. to 30V d.c
  • Sound power (max) 92,3 dB(A) @ 1m
  • High Efficiency LED
  • High Sound Level Buzzer
  • Continuous tone 970Hz / Alternating tone 800-970Hz selectables
  • New Design, Less Thick
  • Wall Mounting
  • Compliant with EN54-23 W-4,6-9,1 and O-4,6-9,1-9,9 and
  • Syncro compliant with EN 54-3:2001 + A1:2002 + A2:2006.
  • Compliant with UNI 11744:2019

LF20WU is an audio warning panel, available in different models and suited for any emergency situation such as fire, flooding, gas leaks, etc., where visual and audio information is needed. Its special design, very pleasant is particularly suited for hotels, shops, malls and cinemas.

Tecnology and design

A special light diffuser guarantees the uniform lighting of the panels label. A high sound level buzzer ensures an efficient acoustic warning in case of alarm, granting the compliance to the norm UNI EN54-3.

The label inside the panel is provided with the standard sentence "FIRE ALARM", but labels with different messages and languages are available as accessory.

Thin and special design make LF20WU warning panel unique for technology and efficiency.

Thickness without backbox 14mm


Installation Instruction

  • Make four holes into the wall to fit the holders (Fig. 2-1)
  • Fix the mounting box with the four screws (Fig. 2-2))
  • Connect the power supply to the terminals (Fig. 1)
  • The sounder emits a pre-alarm signal with alternating sound 800-970Hz, otherwise to set the evacuation alarm signal with fixed sound at 970Hz insert the jumper in the position show (Fig. 1).
  • Fix the central part to the mounting box with the four screw (Fig. 2-3)
  • Place and press the external cover and fix it by the screws (Fig. 2-4)

Fig. 1

Fig. 2

Technical Specification

Product code LF20WU (Wall mount)
Material ABS + PMMA
Installation Wall mount
Nominal Voltage 24 Vd.c.
Voltage limit 18V d.c. - 30V d.c.
Absorption 21mA (average)
Type of connection Clamp
Dimensions with backbox 292x130x55mm (L x H x P)
Operating temperature Da -10°C a +55°C
Sound power (min) 79 dB(A) @ 1m
Sound power (max) 92,3 dB(A) @ 1m
Buzzer frequency 2,8Khz
Sound model Pre-alarm: Alternating tone 800Hz to 970Hz swept at 1 second (1Hz) (EN54-3)
Alarm: Continuous tone at 970Hz
Protection Class IP21C*
*Using conduits DX54216, DX43220 o GW52004