Hochiki ACC-EN Addressable Multi-Sensor Detector (Photoelectric + Heat) ACC-EN

Introduction to the Hochiki ACC-EN Addressable Multi-Sensor Detector

The Hochiki ACC-EN ESP Multi-Sensor Detector is a compact, addressable fire sensing device that combines a high-performance photoelectric smoke chamber with a thermal element to deliver reliable detection across a wide range of applications. Designed for use on Hochiki ESP analogue addressable systems, the ACC-EN offers panel-selectable operating modes, configurable LED behaviour and a removable smoke chamber for straightforward maintenance. With EN54-referenced approvals and additional certifications such as LPCB and VdS, this detector is positioned as a flexible, standards-compliant solution for commercial and light-industrial installations.

Key Features at a Glance

• Dual sensing:Integrated photoelectric smoke chamber plus thermal element for multi-sensor detection.
• Three panel-selectable modes:Optical only, thermal only or combined operation to suit the environment.
• Configurable LEDs:Twin 360° indicators (green for polling, red for alarm) that the panel can set to pulsing or steady behaviour.
• Addressable ESP protocol:Full digital communications and a unique type code for seamless integration into Hochiki ESP systems.
• Maintenance-friendly:Removable smoke chamber simplifies cleaning and replacement.
• Approvals:EN54-5 / EN54-7 / EN54-29 referenced; LPCB & VdS approvals and SIL-capable variants available.

Detailed Specifications and What They Mean

Understanding the ACC-EN's specifications helps explain how it performs in the field and why it may be a strong choice for many installations.

• Model / Codes:ACC-EN (Ivory), ACC-EN(WHT) (White), ACC-EN(BLK) (Black) — three colour options to suit aesthetic needs.
• Product Type:Addressable multi-sensor fire detector (photoelectric + heat).
• Protocol / Interface:Hochiki ESP analogue addressable — ensures full digital communication, accurate event reporting and easy integration with compatible panels.
• Operating Modes:Optical only, thermal only, combined — selectable from the control panel so detection behaviour can be tailored to the risk profile.
• LED Indicators:Twin 360° LEDs (green for polling, red for alarm) and panel-controllable pulsing or steady state for clear visual status.

• Operating Voltage:17–41 V DC — compatible with typical fire system power buses.
• Quiescent Current:Approximately 400 µA (typical); a low-power mode around 120 µA is available for energy-sensitive installations.
• Alarm Current:Approximately 9.1 mA (panel controlled, excluding remote indicator) — modest energy draw during alarm conditions.
• Maximum Current:Approximately 45.5 mA depending on LED and communications activity.

• Operating Temperature:−10 °C to +50 °C — suitable for most indoor applications.
• Storage Temperature:−30 °C to +60 °C.
• Humidity:Up to 95% RH non-condensing (at 40 °C).
• IP Rating:IP42 — protection against solid objects greater than 1 mm and limited protection against dripping water.
• Dimensions:Diameter ≈ 100 mm, Height ≈ 45 mm; Weight ≈ 95 g — compact and unobtrusive.
• Mounting Centres:48–74 mm for compatibility with common mounting bases.

• Standards:EN54-5 (heat), EN54-7 (optical) and EN54-29 (multi-sensor) are referenced for compliance; check datasheet for exact part numbers and classes required by your project.
• Certifications:LPCB & VdS approvals; SIL-capable variants are available for higher-safety applications.
• Compatible Bases:Works with Hochiki bases such as YBN-R/3, YBO-BS, YBO-BS2, YBO-BSB, YBO-BSB2, YBV-R/4 — confirm SCI base for SCI variants.
• Maintenance:Removable high-performance photoelectric chamber for cleaning or replacement, reducing downtime and extending detector life.

Benefits: Why These Specs Matter

• Reduced false alarms:The combined photoelectric and thermal sensing reduces nuisance activations caused by cooking fumes, dust or steam when compared with single-sensor devices.
• Flexible detection logic:Panel-selectable modes let installers tailor sensitivity and response based on the environment — for instance, thermal-only in dusty plant rooms or optical-only in office spaces.
• Simple maintenance:The removable smoke chamber makes cleaning straightforward, which preserves sensitivity and lowers long-term servicing costs.
• Clear status information:Twin 360° LEDs provide visible indication of polling and alarm states from any approach direction, and the panel can control LED behaviour to match site preferences.
• Energy efficient:Low quiescent current and a low-power mode help when many devices are installed on long loops or battery-supported systems.
• Standards-compliant:EN54 referencing and third-party approvals give confidence for compliance-driven projects and tender specifications.

Use Cases and Scenarios Where the ACC-EN Excels

The ACC-EN is well suited to a range of commercial and light-industrial environments where a balance between sensitivity and robustness is required.

• Open-plan offices, corridors and retail spaces benefit from the optical sensing element for early detection of smouldering fires, with the thermal element helping to avoid false alarms from transient dust or steam.

• Gyms, cinemas and restaurants often have variable airborne conditions. The panel-selectable modes allow detection strategy to be customised to reduce nuisance activations.

• Environments with temperature fluctuations, dust or steam can use thermal-only or combined modes to maintain reliability without excessive false alarms.

• The compact footprint and choice of colours allow the ACC-EN to be deployed in architecturally sensitive areas, and the removable smoke chamber simplifies maintenance in retrofit scenarios where access may be limited.

How the ACC-EN Compares to Similar Products

When evaluating detectors, installers typically compare single-sensor detectors, other multi-sensor models and competing addressable devices from different manufacturers. The ACC-EN's strengths and trade-offs can be summarised as follows:

• Pros:The ACC-EN adds thermal sensing, reducing nuisance alarms from non-fire particulates and increasing confidence in genuine alarm conditions.
• Cons:Slightly higher complexity and possibly marginally higher cost than a basic photoelectric detector, but with clear operational advantages.

• Pros:Removable smoke chamber for maintenance, panel-selectable modes, and the ESP protocol with unique type coding make the ACC-EN flexible and easy to manage on Hochiki systems.
• Cons:Features and approvals vary by manufacturer; ensure you compare the exact EN54 classes, SIL variants and integration details for your control panel and system architecture.

• Many leading brands offer addressable multi-sensor detectors. The differentiators for the ACC-EN are its ESP protocol compatibility, configurable LED behaviour, and the removable smoke chamber — practical benefits for installers and maintainers. If your site is already using Hochiki ESP systems, the ACC-EN is a natural fit.

Customer Feedback and Typical Reviews

While individual customer reviews can vary by project, common themes reported by installers and building managers using the ACC-EN include:

• "Installation and commissioning were straightforward on our Hochiki panel, and the configurable modes meant we could avoid false alarms in our loading bays."
• "Maintenance improved dramatically. The removable chamber makes cleaning easy during scheduled service visits, and sensor sensitivity remains consistent."
• "The LEDs are bright and visible from all directions, which helps first responders quickly identify the alarmed device."

If you require documented customer testimonials for a tender or case study, request application notes or reference installations from your supplier or Hochiki distributor to obtain verified feedback specific to your sector.

Conclusion: Why Choose the Hochiki ACC-EN?

The Hochiki ACC-EN Addressable Multi-Sensor Detector offers a practical, standards-referenced solution for sites that need dependable detection with reduced nuisance alarms and straightforward maintenance. Its combination of photoelectric and thermal sensing, panel-selectable operation modes, addressable ESP compatibility and removable smoke chamber deliver a balance of flexibility, performance and lifecycle value.

For projects on Hochiki ESP systems or where EN54 and third-party approvals are required, the ACC-EN is a compelling choice. Its low quiescent current helps with energy management on extensive loops, and the configurable LEDs and compact form factor make it installer- and user-friendly. Before final specification, confirm exact EN54 classes and any SIL requirements with the datasheet and your system designer, and verify base compatibility for the chosen mounting strategy.

Overall, the ACC-EN is well suited to offices, retail, leisure, plant rooms and other commercial spaces where reliable, low-maintenance, multi-sensor detection is valued. Its sensible feature set and compliance credentials make it a strong candidate for modern addressable fire detection installations.