Introduction: Meet the Ajax FireProtect 2 AC Heat & Smoke Wireless Detector
The Ajax FireProtect 2 AC (Heat/Smoke) Jeweller is a mains-powered, combined smoke and heat detector designed for homes and light commercial sites. Combining a dual-spectrum optical smoke sensor with dedicated thermistors, built-in siren, encrypted wireless communications and a non-replaceable backup cell, this device is built to deliver dependable, low‑maintenance fire detection as part of a monitored Ajax security system or as a standalone local alarm. With features such as HazeFlow 2 filtering to reduce false alarms and SmartBracket mounting with WAGO terminals for safe wiring, it balances professional-grade reliability with straightforward installation and operation.
Key features at a glance
- Dual-spectrum optical smoke sensor(blue + IR) with HazeFlow 2 for reduced false alarms from steam and cooking.
- Heat detectionvia two Class A1R thermistors — triggers at >+64°C or on a rapid temperature rise (≥10°C/min).
- Mains-powered with backup: 110–240 V AC supply plus non-replaceable CR‑2/3AZ lithium cell for continuity.
- Built-in alarm: 85 dB siren at 3 m, LED indication and distinct tones for alarm, fault and power status.
- Wireless comms: Jeweller encrypted, frequency-hopping protocol — up to ~1,700 m open-space range, ERP up to 20 mW.
- Interconnect and fallback: hub-initiated multi-device alarm (~20 s) and detector-to-detector fallback (~1 min) if the hub is unavailable.
- Tamper & authenticationprotections and professional-grade mounting hardware (SmartBracket with WAGO terminals).
Detailed specifications and the benefits they deliver
FireProtect 2 AC uses a dual‑spectrum optical smoke sensor combining blue and infrared wavelengths. The sensor is paired with Ajax's HazeFlow 2 algorithm, which filters transient aerosols, cooking fumes and steam that commonly trigger nuisance alarms in ordinary smoke detectors. In practical terms, this reduces unnecessary evacuations and alarm fatigue while keeping sensitivity high for true smouldering or flaming fires.
Heat sensing is handled by two Class A1R thermistors. The detector triggers on absolute temperature (>+64°C) or on rapid temperature increases (≥10°C/min), giving robust detection of fast‑developing heat events even when smoke signatures differ from typical patterns.
The device is mains‑powered (110–240 V~, 50/60 Hz) with a mains consumption up to 2 W, ensuring continuous operation in normal conditions. A built‑in non‑replaceable CR‑2/3AZ lithium cell provides backup power in case of mains loss, allowing the detector to maintain local alarm capability and limited telemetry. The built‑in siren reaches 85 dB at 3 m — loud enough to alert household occupants and workers — and the device uses distinct audible and LED indicators to communicate alarm, fault or power states.
FireProtect 2 AC uses Ajax’s Jeweller protocol (GFSK) with encryption and frequency hopping to maintain a reliable, secure link to Ajax hubs. Open‑space radio range is up to ~1,700 m (actual range will be lower in buildings), and ERP is up to 20 mW. When connected to an Ajax hub, the detector participates in hub-initiated multi-device alarms with propagation times around 20 seconds for network-wide notification. If the hub becomes unavailable, a detector-to-detector fallback mode enables local interconnection with an alarm propagation time of about one minute, preserving local safety even during communications outages.
The unit measures 122 × 122 × 54 mm and weighs approximately 318 g, with a choice of white or black finishes. It installs on Ajax’s SmartBracket which includes WAGO terminal connectors to facilitate safe and tidy mains wiring. Tamper protection covers both mounting and chamber access, and device authentication helps mitigate spoofing or unauthorized replacement.
FireProtect 2 AC conforms to relevant safety standards cited in the datasheet (EN 54‑5, EN 14604, EN 50291 — check regional datasheets for exact marks). It carries a two‑year manufacturer warranty and should be installed and maintained following local codes and wiring regulations.
Use cases and scenarios where FireProtect 2 AC excels
- Family homes and apartments: The combination of smoke and heat detection with false‑alarm reduction is ideal for kitchens near living spaces and for multi‑room coverage where nuisance alarms can otherwise undermine alarm reliability.
- Light commercial settings: Small offices, boutique retail, salons and cafes benefit from mains power (no frequent battery replacements) and a built‑in loud siren. The SmartBracket wiring and tamper protection meet common installation expectations for leased commercial fit‑outs.
- Monitored systems: When paired with an Ajax hub and professional monitoring, FireProtect 2 AC becomes part of a rapid alerting and response environment with encrypted wireless communications and networked alarm propagation.
- Standalone local alarm use: Even without a hub, the detector can sound its own alarm autonomously and use its detector-to-detector fallback to alert other nearby detectors — useful in retrofit projects or where centralized monitoring is not required.
- Environments prone to nuisance triggers: Homes or workplaces with steam, aerosols or frequent cooking benefit from HazeFlow 2 filtering to reduce false activations compared with plain optical-only detectors.
How it compares with similar products on the market
When evaluating FireProtect 2 AC against other fire detectors, several differentiators emerge:
- Mains power plus backup— Many wireless detectors are battery-only; FireProtect 2 AC’s mains supply reduces maintenance while a backup cell ensures continued local protection during power loss.
- Dual-sensor approach— The combined dual-spectrum optical sensor and heat sensing improves detection across a wider range of fire types (smouldering and flaming) compared to single-mode detectors.
- False-alarm mitigation— HazeFlow 2 filtering and a dust/insect-protected chamber make this model particularly effective in kitchens and bathrooms where conventional smoke detectors can be prone to nuisance activations.
- Professional-grade wireless— The Jeweller protocol emphasizes range, encryption and reliability compared with consumer-grade Wi‑Fi or Bluetooth solutions. This makes it a better fit for monitored security systems and professional installations.
- Interconnect behavior— With both hub-initiated multi-device alarms and detector-to-detector fallback, FireProtect 2 AC offers layered redundancy that many single-vendor wireless detectors do not provide.
Compared with conventional wired interconnectable detectors, FireProtect 2 AC simplifies installation in retrofit situations by removing the need for interconnect wiring while keeping professional-level features. Against consumer smart detectors, it trades some cloud-based consumer features for robustness, long radio range and professional monitoring compatibility.
Customer impressions and installer feedback
Below are anonymized, illustrative impressions gathered from installers and early users to convey typical strengths and areas to consider. These are examples of the kind of feedback installers and homeowners report rather than verified testimonials tied to specific individuals.
- "Reliable and low-maintenance"— Installers appreciate the mains power with backup arrangement and the SmartBracket WAGO connectors for quick, safe hookups. Reduced site visits for battery changes is cited as a practical advantage.
- "Fewer false alarms in kitchens"— Homeowners note that HazeFlow 2 significantly cuts down nuisance alarms from cooking and steam compared with older optical detectors, while still alerting reliably to real smoke events.
- "Good integration with monitored systems"— Security companies value the encrypted Jeweller comms and predictable alarm propagation in a monitored Ajax installation, plus fallback interconnect when the hub is offline.
Conclusion: Why choose the Ajax FireProtect 2 AC?
Ajax FireProtect 2 AC combines mains reliability, dual-mode sensing, false-alarm reduction and robust wireless integration to deliver a balanced fire detection solution for modern homes and light commercial spaces. Its strengths are professional-grade communications, thoughtful false-alarm mitigation, and practical installation features like SmartBracket and WAGO terminals. Whether you are wiring a monitored security system or upgrading detectors in an occupied building, FireProtect 2 AC offers dependable detection, audible local alerts and system-level interconnection that together improve safety while reducing nuisance interruptions.
With compliance to recognized standards, a two-year warranty and features designed for real-world use, FireProtect 2 AC is a compelling option for buyers looking for a low‑maintenance, high‑reliability detector. For monitored operation and full interconnect capabilities, pair it with an Ajax hub and ensure installation follows local codes and regional certification requirements.
