Description
The Maple Armor FW2521 Addressable Heat Detector is a high-performance, intelligent thermal life-safety sensor engineered to protect challenging environments where airborne smoke, dust, steam, or exhaust fumes make standard optical sensors unsuitable. Driven by an advanced internal processor, the Maple Armor FW2521 Addressable Heat Detector features dual thermal detection logic combining fixed-temperature activation and rapid rate-of-rise response. Operating seamlessly on the Signaling Line Circuit (SLC) of Maple Armor FW2105 and FW2107 panels, this Maple Armor FW2521 Addressable Heat Detector occupies a single address and provides rock-solid fire protection across commercial kitchens, parking garages, and industrial boiler rooms.
Technical Specifications Table
| Product Model | FW2521 (Series 2 Addressable Thermal Detector) |
| Manufacturer & Brand | Maple Armor Technologies Inc. |
| Country of Origin | Canada |
| Thermal Detection Method | Dual Mode: Fixed Temperature (135°F / 57.2°C) & Rate-of-Rise (15°F / 8.3°C per min) |
| Nominal Operating Voltage | 24 VDC (Operating Voltage Range: 15.3 to 28 VDC) |
| Standby Current Consumption | 0.16 mA @ 24 VDC |
| Alarm Current Consumption | 0.65 mA @ 24 VDC |
| SLC Circuit Loading | Occupies 1 address; supports up to 252 addressable devices per loop |
| Visual Annunciation | Dual status LEDs providing full 360° visibility (Flashing = Normal, Steady = Alarm) |
| Remote Output Terminal | Fully compatible with Maple Armor FW2561-RI Remote LED Alarm Indicator plate |
| Compatible Panel Series | Maple Armor Series 2 (FW2105 Multi-Loop & FW2107 Releasing Panels) |
| Compatible Base Models | FW2501 (4-inch Standard), FW2502 (6-inch Flanged), FW2509 (Sounder Base) |
| Field Wiring Terminals | 18 AWG to 12 AWG (0.82 mm² to 3.31 mm²) solid or stranded wiring |
| Dimensions & Weight | Diameter: 105 mm (4 in.), Height: 43 mm (1-5/8 in.) | Shipping Weight: ~0.14 kg |
| Enclosure Construction | High-impact, flame-retardant engineered polymer |
| Operating Environment | 32°F to 100°F (0°C to 38°C) continuous, 0% to 93% RH non-condensing (Indoor dry) |
| Listing & Approvals | UL 521 Listed, ULC-S530 Certified, FCC Compliant |
⚙️ Engineering & Architectural Resources
Verify thermal spacing matrices, ceiling height reduction factors, and circuit impedance boundaries in compliance with national NFPA 72 Fire Alarm Code Standards before mounting the Maple Armor FW2521 Addressable Heat Detector grid.
Precision Dual-Mode Thermal Detection & Hostile Environment Reliability
The core advantage of the Maple Armor FW2521 Addressable Heat Detector is its high-sensitivity electronic thermistor circuit. Unlike standard mechanical heat sensors that suffer from thermal lag, the internal MCU continuously evaluates real-time temperature fluctuations. If a sudden spike in thermal energy occurs (Rate-of-Rise) or ambient temperature reaches the fixed 135°F (57.2°C) threshold, the detector instantly transmits an alarm condition to the central panel, ensuring rapid early warning before radiant flames cause extensive property loss.
Engineered for high installation versatility, the Maple Armor FW2521 Addressable Heat Detector fits onto the same family of plug-in twist bases used by Series 2 smoke detectors. Addresses are configured prior to installation using an electronic handheld programmer, simplifying maintenance and device swapping. This plug-and-play modularity ensures that facilities with mixed sensing requirements can maintain uniform base wiring throughout the property.
- Dual-Action Thermal Response: Provides instantaneous rate-of-rise detection during rapid heat surges and a fixed 135°F ceiling threshold for slow-burning fires.
- Complete 360-Degree Diagnostics: Dual visible LED indicators provide instant identification of normal, trouble, and alarm states from any angle below.
- Auxiliary Remote Output: Direct wiring terminals support external remote LED indicator plates for ceiling voids and enclosed spaces.
- Electronic Handheld Addressing: Eliminates mechanical DIP switches and rotary dials, allowing rapid digital addressing and verification.
Frequently Asked Questions (FAQ)
Q1: Does the Maple Armor FW2521 Addressable Heat Detector include a mounting base?
A: No, detector bases are sold separately. You can choose between the FW2501 (4-inch standard base), FW2502 (6-inch flanged base), or FW2509 (sounder base) depending on site wiring and mounting needs.
Q2: Where should the Maple Armor FW2521 Addressable Heat Detector be installed instead of a smoke detector?
A: It is ideal for commercial kitchens, boiler rooms, parking garages, generator rooms, loading docks, and manufacturing plants where steam, exhaust fumes, or dust would cause false alarms on optical smoke detectors.
Q3: How is the address assigned to this heat detector?
A: Device addresses are electronically written into the non-volatile memory of the detector using a Maple Armor handheld programmer before locking the unit into its base.
Q4: Can this detector trigger an external remote lamp?
A: Yes. When connected to compatible bases, the detector provides dedicated terminals to drive the Maple Armor FW2561-RI Remote LED Indicator plate.
Q5: Which fire alarm control panels support the FW2521?
A: The FW2521 is fully compatible with Maple Armor Series 2 control panels, including the FW2105 multi-loop panel and the FW2107 agent releasing panel.


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