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Can third-party equipment be connected to a Hochiki ESP loop?

Third-party equipment connects to a Hochiki ESP loop through a CHQ module: a mini module, a larger interface module or, for conventional detectors, a zone monitor.

Direct answer

Third-party equipment is not connected directly to a Hochiki ESP loop, even if it is addressable on another manufacturer's system. It is connected through a CHQ module, which takes one loop address. Mini modules handle single signals: the CHQ-SIM (input), CHQ-SOM (relay output), CHQ-POM (24 V DC output with two inputs) and CHQ-CP2 (special call points). Larger modules such as the CHQ-DIM2(SCI), CHQ-DRC2(SCI), CHQ-MRC2(SCI), CHQ-PCM(SCI) and CHQ-FTM handle more inputs and outputs, mains switching or 4-20 mA signals. Conventional detectors connect through a CHQ-SZM2(SCI) or CHQ-DZM(SCI) zone monitor. Check the module data sheet and control panel compatibility before connecting anything.

Applies to

  • Products / Models: Mini modules CHQ-SIM, CHQ-SOM, CHQ-POM, CHQ-CP2; interface modules CHQ-DIM2(SCI), CHQ-DRC2(SCI), CHQ-MRC2(SCI), CHQ-MRC2/FS(SCI), CHQ-PCM(SCI), CHQ-FTM, CHQ-DSC2(SCI); zone monitor modules CHQ-SZM2(SCI), CHQ-DZM(SCI)
  • Firmware / Version: Not applicable
  • Region: Not applicable
  • Standards: EN 54-18 (input/output devices: CHQ-SIM, CHQ-SOM, CHQ-POM, CHQ-DIM2(SCI), CHQ-DRC2(SCI), CHQ-MRC2(SCI), CHQ-PCM(SCI), CHQ-FTM, CHQ-SZM2(SCI), CHQ-DZM(SCI), CHQ-DSC2(SCI)); EN 54-17 (short-circuit isolators: the (SCI) modules)

Choosing the right module

The control panel must support each module you choose. Several data sheets state that fire alarm control panel compatibility is required, and the CHQ-DIM2(SCI) monitors its inputs only when the panel supports its Enhanced mode.

Mini modules

  • CHQ-SIM: designed to allow a single monitored input to be connected to the ESP loop. 10 KΩ (EOL resistor provided) 470 Ω (EOL resistor provided)
  • CHQ-SOM: designed to allow a single relay output to be connected to the ESP loop, rated to 30 V DC (max), 1 A (resistive load). 
  • CHQ-POM: supplies 24 V DC at various current levels, 2 mA to 32 mA, and includes two monitored inputs, giving connectivity to the ESP loop for devices that are not ESP addressable, such as the IFD-E flame detector.
  • CHQ-CP2: used as a call point module for special applications, such as addressable key switches and explosion-proof call points.

Interface modules for more inputs and outputs

These modules are loop powered and are also available as DIN rail versions. (SCI) in the model number means that the module has an integral short-circuit isolator.

  • CHQ-DIM2(SCI): two independent inputs that monitor volt-free contacts, normally open or normally closed, for equipment such as door contacts, sprinkler flow switches and plant equipment. Enhanced resistive mode requires panel support.
  • CHQ-DRC2(SCI): two independently controlled changeover relays rated at 30 V DC, 1 A, with an auxiliary monitored input, for example to control dampers.
  • CHQ-MRC2(SCI): a single mains-rated relay output, 250 V AC at 5 A or 48 V DC at 2 A (resistive load), with an auxiliary monitored input, for equipment such as dampers and door magnets. For mains switching, the control panel must comply with the Low Voltage Directive for SELV circuits, and the relay output must be protected by a suitable over-current protection device because no fuse is fitted.
  • CHQ-MRC2/FS(SCI): the fail-safe version of the CHQ-MRC2(SCI). Check that the control panel supports fail-safe operation.
  • CHQ-PCM(SCI): four changeover relay outputs and four monitored inputs for volt-free contacts in one module, for plant control.
  • CHQ-FTM: two inputs for equipment with 4-20 mA outputs, such as gas detectors, flame detectors and industrial equipment.
  • CHQ-DSC2(SCI): two monitored sounder circuits with an auxiliary monitored input, for conventional sounders. It needs an auxiliary 24 V DC supply.

 

Zone monitor modules for conventional detectors

  • CHQ-SZM2(SCI): one loop-powered zone. The number of detectors depends on the detector type in the data sheet table, for example up to 6 detectors of the types limited to six, or one beam detector and no other detectors.
  • CHQ-DZM(SCI): two zones, each with its own limit by detector type, for example up to 30 detectors of the limited types on each zone (60 in total) or 3 beam detectors. It needs an auxiliary 24 V DC supply.

The detector tables in both data sheets list Hochiki conventional detectors only. Before you connect a conventional detector from another manufacturer, confirm with Hochiki Europe Technical Support that it is compatible with the zone monitor.

When to contact technical support

Contact Hochiki Europe technical support if you are unsure which module suits a specific third-party device, or whether that device may be connected through the module you have chosen.

Safety note

This article is general guidance for Hochiki Europe products. Design, installation, commissioning, maintenance and modification of fire detection and alarm systems should be carried out by, or under the responsibility of, a competent person in accordance with the applicable standards (for example BS 5839-1 in the UK). Statutory requirements imposed by the relevant enforcing authority also apply. Always refer to the current product manual and data sheet for the exact model before carrying out any work.

References

Last reviewed: pending Technical Support review