Fire Denyer Specifications

The Fire Denyer Controller

  • Single flush-box mounting; standard light switch size, featuring:
    • 3 buttons: Test, Hush, Reset
    • 1 indicator LED, red/green: operation status indicator
    • Normal = green
    • Tripped = red fast flashing
  • Splash-proof when mounted on a flat wall surface
  • 90 – 245 volt AC, 50hz or 60 hz, mains supply
  • Power consumption typically 2 to 3 watts (including contactor)
  • * Ni-Mh rechargeable backup battery located behind The Fire Denyer Controller. Recharged when mains power on.
    • Battery life typically 5 to 7 years
    • Contact Fire Preventors Ltd for replacement
  • One optically-isolated input for safe connection to third party systems (e.g. fire or security alarm panels)
    • Link selectable, 2-5 VDC or 5 – 30 VDC (default = 5-30V)
    • Isolation voltage exceeds 2KV
  • One optically-isolated output for safe connection to third party systems (e.g. fire or security alarm panels)
    • Link selectable, full isolation or referenced to common (default = isolated)
    • Rating: low current (50mA), high voltage (100V DC). Solid state output
  • Contactor supplied within NZ and Australia = 230/240 volt AC 50 Hz 4-pole 25
    • amp DIN mounted. Standard contactor is two ways wide (36mm) on DIN rail
  • Contactor driver output = triac switched phase (230V AC: 50 watts maximum)
  • Smoke detector + 12 V nom. 4 -wire, photoelectric with internal sounder Monitored line; The Fire Denyer detects wiring faults for fail-safe operation
    • Each smoke detector has a loud internal audible alarm
    • Additional smoke detectors must be supplied (or approved in writing) by Fire Preventors Ltd
  • Heat detectors must be supplied (or approved in writing) by Fire Preventors Ltd
  • No user serviceable parts inside


Unattended operation (proposed) : after 30 minutes of no intervention when in alarm mode, the FD will auto-hush for 60 minutes then auto-reset. If the activation returns within 30 minutes, the FD will again auto-hush and remain hushed and inactive until manually reset. Power will be cut off with the first activation, and restored with the auto-reset (after 90 minutes).

The reasoning is that a unattended endless alarm will be annoying for neighbours and power must be restored to fridge/freezers etc. in case the occupants are away.

This is only likely to occur when occupants are away from home or the property is vacant.

Flashing Alerter

  • The Flashing Alerter is a dual mode strobe indicator
    • Red flashing indicates a fire alarm
    • Green or Blue flashing indicates a door ‘bell’ activation
  • The red flashing occurs whenever smoke has been detected
    • The green or blue flashing is initiated by the door bell and will stop flashing after 45 seconds.
  • Multiple Flashing Alerters can be connected to The Fire Denyer
  • The Flashing Alerter is wired back to The Fire Denyer Controller using 4-core 0.5mm security cable and is wired as shown in the wiring diagram
  • The Flashing Alerter can also drive a 12V DC Waking Vibrator
    • The wiring between the Flashing Alerter and Waking Vibrator is typically 0.5mm twin Tru-rip
    • The Flashing Alerter that is driving the Waking Vibrator must have a battery connected to it due to the heavy load applied by the Waking Vibrator
  • Only supplied or approved batteries may be used
    • Care must be taken not to damage the battery or battery lead
    • The battery connector is polarised and must not be modified or extended
  • The Flashing Alerter may be wall or ceiling mounted
    • Wall mounting typically within 500mm of the ceiling, mounted vertically
    • Position the Flashing Alerter so that it will be most visible by the occupants during normal activities
    • The visibility of the Flashing Alerter will depend on ambient light, colour scheme and reflective surfaces
    • Direct line of sight is generally not required but is desirable
  • Connections – Functions:
    • The Flashing Alerter has 2 connectors on it; battery connector and wiring connector
    • The battery connector is polarised and must not be modified or extended
    • The 8-way plug-in screw terminal block provides all wiring connections:
      • 1 = +V +ve power supply from The Fire Denyer Controller, typically 12 to 14 volts
      • 2 = -V -ve power supply common from The Fire Denyer Controller
      • 3 = A main control input from The Fire Denyer Controller
      • 4 = B aux connection (reserved)
      • 5 = S+ BS +v power (always live – not switched)
      • 6 = S- BS -ve power (switched to common to activate Waking Vibrator)
      • 7 = D+ Door ‘Bell’ push button input (switch to D-)
      • 8 = D- Door ‘Bell’ push button input (-V)
  • The door ‘bell’ can be connected to any of the Flashing Alerters.

Smoke Detector

The specifications for the smoke detector supplied by Fire Preventors Ltd at the date of publication are shown below

  • 4-wire, 12/24VDC
  • Maximum permissible current 85mA
  • Alarm sound 85 dB at 3 m

Important Note

If it is intended to use a different smoke detector in the system contact Fire Preventors Ltd for written approval and system compatibility checks.

The Fire Denyer Compliance

Tested and passed AS/NZCSIPR14.1 2003
Tested and passed AS/NZS 3100:2002
Supplier Code Number Z1120

The Fire Denyer Patents

New Zealand – Patent No. 517688

Australia – Patent No. 2003200895