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Hochiki VADs - A guide to our EN54-23 compliant visual alarm devices

Hochiki's VADs - a guide to our EN54-23 compliant visual alarm devices

VADs - What Are They?

Visual Alarm Devices (VADs) are an essential component to most fire alarm systems. They provide a visual indication of an alarm condition to those people who wouldn’t normally be alerted to a fire by standard audible-only devices such as sounders and bells.

The Disability Discrimination Act of 1995 made the inclusion of VADs mandatory in all public buildings, specifically in areas where people with impaired hearing work in isolation. But VADs are also required in noisy environments where staff might be wearing ear defenders such as factories, foundries etc.

A new product standard, BS EN 54-23:2010 (Fire detection and fire alarm systems. Part 23: Fire alarm devices - Visual alarms devices), has been introduced primarily to standardise the requirements, test methods and performance of VADs and ensure their light output is measured in a uniform manner. This standard became mandatory throughout Europe on 31st December 2013 and all manufacturers of VADs are affected.

 

Wide range of devices,All products compliant with EN54-23, Red or White LEDs available

 

Calculating Coverage Volume

The needs for VADs will be identified as part of the risk assessment. As with other fire alarm system components, there are a number of challenges that must be considered in the layout, design and installation of VADs.

One challenge is the illumination of the entire volume of the open space where the alarm must be visible. VADs must produce sufficiently intense light, so that an individual located anywhere in the space, looking either towards or away from the VAD, would be alerted in the event of an emergency.

The performance of VADs under the new standard is now assessed against a minimum required illumination of 0.4 lux on surfaces perpendicular to the direction of the light emitted from the device.

VADs will also now be classified into three categories based on their application:

VAD categories explained

W and C mounted categories pertain to specific installation heights and particular patterns of coverage - see the below table for more information.

Within these two categories, the shape of the volume covered is fixed by the standard - a cylinder for the ceiling-mounted category and a cube for the wall-mounted category. The dimensions of this coverage volume and the mounting height are specified by the manufacturer.

For all categories, the volume covered can be used to determine VAD spacing within the building.

 

VADs coverage volumes - wall-mounted models

 

‘W’ Category Coverage Volume

Wall mounted VADs cover a cuboid volume with a square floor area. The coverage volume is presented as a code in the form of W - X - Y, where

W = Wall-mounted category
X = the maximum mounting height (m)
Y = the width and length (m) of the coverage floor area

The minimum mounting height allowable by the standard is 2.4m.

For example one of Hochiki’s wall-mounted VADs has a classification of W-2.4-5. This means it should be mounted at 2.4m from the floor and will cover an area of up to 5m by 5m.

 

‘C’ Category Coverage Volume

Ceiling-mounted VADs cover a cylindrical area. The coverage volume is presented as a code in the form of
C - X - Y, where

C = Ceiling-mounted category
X = the maximum mounting height (m)
Y = the diameter (m) of the coverage volume’s floor area

The maximum mounting height can only be specified as 3, 6 or 9m.

For example, one of Hochiki’s ceiling- mounted VADs has a classification of
C-3-15. This means it can be mounted
up to 3m from the floor and will cover
a cylindrical area of 15m diameter.
Therefore the width of the room is Y/1.414.

 

VADs coverage volumes - ceiling-mounted models

 

Our VADs

 

 

CHQ-CB 

An Addressable Loop-Powered Ceiling Beacon, with a high intensity LED and a custom designed free-form optic which produces a highly visible flash. Coverage diameters include 6.5m, 7.9m, 9.5m, 10m, 11.4m and 15.1m diameter*1. The unit is designed to fit the YBN-R/3, YBN-R/3(SCI), YBO-BS or the YBO-R/(SCI), and is available in Ivory, White or Red case with either Red or White LEDs (six variants).

► Loop Powered
► Single loop address via TCH-B200
► High Intensity LED technology
► 0.5/1 Hz flash frequency
► Choice of 2 LED colours (red or white)
► Approved to EN54-23:2010 - Category ‘C’
► Operating voltage 17-41 V dc

 

Hochiki Ceiling Mounted VADs

 

 

 

 

 

 

 

CHQ-WSB2

An Addressable Loop-Powered Wall Sounder Beacon, featuring an integral beacon within the horn which utilises high intensity LED technology. Available in Red or White case with either Red or White LEDs (four variants).

Special bases available: YBO-R/3(RED), YBO-R/SCI(RED), YBO-R/3(WHT) and YBO-R/SCI(WHT-SNDR)

► Variable flash frequency
► High Intensity LED technology
► Independent control of Sounder and Beacon
► Auto-shutdown mode available - can be set      independently for sounder or beacon*2
► Approved to EN54-23:2010 - Category ‘O’
► Operating voltage 17-41 V dc

  Hochiki's EN54-23 compliant Wall Sounder Beacons
 

CHQ-WB

An Addressable Loop-Powered Wall Beacon, with a high intensity LED and a custom designed free-form optic which produces a highly visible flash. Coverage volumes include 5 sqm, 5.5 sqm and  7 sqm*1. The unit is designed to fit the YBN-R/3, YBN-R/3(SCI), YBO0BS or the YBO-R/(SCI), and is available in Ivory, White or Red case with Red or White LEDs (six variants).

► Loop Powered
► Single loop address via TCH-B200
► High Intensity LED technology
► 0.5/1 Hz flash frequency
► Choice of 2 LED colours (red and white)
► Approved to EN54-23:2010 - Category ‘W’
► Operating voltage 17-41 V dc

 
 

YBO-BSB2

Model YBO-BSB2 is an addressable loop powered Base Sounder with integral Beacon, innovatively designed to give a range of tones and volumes with a maximum output of up to 98 dB(A) (±2dB(A)) with low current consumption. The unit is designed to fit to the Standard Base (YBN-R/3) or the Isolator Base YBN-R/3(SCI) and can be fitted with any of the ESP Range of Sensors, Beacons or Remote Indicators. The unit can also be converted into a wall sounder beacon with the simple addition of a Cap (SI/CAP2). The sounder is Ingress Protection rated to IP21 and for internal use only.

► Single Loop Address - addressed via the TCH-B200 Hand Held Programmer 
► Sounder and Beacon can operate independently*2    
► 0.5 or 1Hz flash frequency*2
► 51 User-Selectable Tones (all tones EN54-3 compatible)
► Auto-Shutdown feature prevents noise pollution*2  
► ‘O’ Rated Beacon to EN54-23  
► Available with Red or White LEDs
► Available with White or Ivory case

  Hochiki's EN54-23 compliant Base Sounder Beacons
 

CWST Range

A range of Conventional Beacons, which can be used as wall or ceiling devices.  All variants feature high output LEDs, advanced optics and an innovative lens design, providing outstanding omni-directional light coverage at low current draw.  Coverage volumes include 194m3 and 92m3 (wall mounted at 2.4m) and between 208m3 and 638m3 (ceiling mounted between 3m and 9m). The range includes 8 variants, which are determined by case colour (red or white), LED colour (red or white) and back box (standard or weatherproof (IP65)).

► Approved to EN54-23, C & W categories
►Advanced optics ensure superior light coverage at low current draw
►Synchronised flash exceeds EN54-23 standard
►Soft start feature reduces power surges during system start-up

  Hochiki's Conventional EN54-23 compliant Beacons

*1 dependant on LED colour and model variant

*2 dependant on control panel compatibility

Choosing the correct VAD

 

With the wide choice of VAD variants available it might seem a daunting task to identify the best unit for the application. Therefore we have devised this simple configuration table which allows you to source the correct Hochiki VAD by answering questions and following the branches to the appropriate device variant.

Simply select the VAD type, then the case colour and finally the LED colour. The ratings column allows you to check the coverage volume settings available. Coverage volumes are selected via the CIE*.

 
Hochiki Addressable EN54-23 compliant VADs - selection table
 
Hochiki's Conventional EN54-23 compliant VADs - selection table

 

 

Learn More

We have a VADs Overview, portions of which have been used to compile this page.  You can download this for free, see the PDF icon opposite.

Alternatively, if you have any VAD queries, drop us a line using the enquiry form below.

Download our FREE VADs Overview

 

For almost 100 years Hochiki has led the way in the design and manufacture of innovative life safety solutions. Its leading edge commercial and industrial fire detection and emergency lighting products have acquired global acceptance as the benchmark for high-integrity and long-term reliability.

With a global sales turnover exceeding £400m Hochiki is a wholly independent, multinational, publicly listed company with over 1,500 employees working across five manufacturing plants, 32 sales offices and 18 subsidiaries.

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