System Sensor P2RLED — an L-Series with LED indoor 2-wire horn strobe for wall mounting, in a red housing marked FIRE, with rotary-switch selectable candela, horn tone and volume settings.
The L-Series with LED platform combines a selectable-output horn with an LED strobe. LED lighting technology offers significantly lower current draw compared to older xenon bulbs across a full candela range, which improves design flexibility for notification appliance circuits (NACs) while also reducing power supply requirements. The P2RLED uses a universal mounting plate with a plug-in design and minimal intrusion into the back box, and the plate includes an onboard shorting spring so installers can test wiring continuity before the device is installed. Diagnostic test points on the face of the appliance allow device voltage to be measured with a digital voltage meter (DVM) without removing the appliance from the wall, which speeds troubleshooting and end-of-line voltage checks. Construction is tamper resistant, and the appliance is electrically compatible with legacy SpectrAlert, SpectrAlert Advance and L-Series devices.
Specifications
| Model |
P2RLED |
| Description |
2-Wire, Horn Strobe, Wall, Red |
| Marking |
FIRE |
| Strobe light source |
LED |
| Field-selectable candela (wall units) |
15, 30, 75, 95, 110, 135 and 185 cd |
| Maximum strobe current draw, 16–33 V (wall) |
15 cd — 18 mA; 30 cd — 22 mA; 75 cd — 70 mA; 95 cd — 75 mA; 110 cd — 85 mA; 135 cd — 105 mA; 185 cd — 120 mA |
| Nominal voltage |
Regulated 24 VDC |
| Operating voltage range |
16 to 33 V (24 V nominal) |
| Strobe flash rate |
1 flash per second |
| Horn tone patterns |
Temporal 3, non-temporal, 3.1 kHz Temporal 3 and 3.1 kHz non-temporal, each at high or low volume (eight rotary switch positions) |
| Sound output, 16–33 V DC |
87 dBA high / 79 dBA low (Temporal 3 and non-temporal); 86 dBA high / 80 dBA low (3.1 kHz tones) |
| Standard operating temperature |
32°F to 120°F (0°C to 49°C) |
| Humidity range |
10 to 93% non-condensing |
| Input terminal wire gauge |
12 to 18 AWG |
| UL listing |
S5512, S4011 (horn strobes and strobes) |
Installation notes
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24 V only — not a 12 V appliance: L-Series LED strobes and horn strobes are rated at a nominal regulated 24 VDC with an operating range of 16 to 33 V. The 8–17.5 V (12 V nominal) range published for this family applies to the horn-only models, not to horn strobes. Do not apply it to the P2RLED.
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Sizing NACs: the strobe current figures above are strobe-only. Total horn strobe current depends on the candela setting, tone pattern and volume setting together, and is higher than the strobe figure alone — use the horn strobe current draw table in the data sheet for NAC loading calculations.
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Synchronization: achieved through UL approved power supplies that support the System Sensor Sync protocol, or a System Sensor MDL3 Sync Module.
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Continuity check before mounting: the universal mounting plate has an onboard shorting spring, so wiring continuity can be verified before the appliance is plugged in.
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Retrofit: electrically compatible with legacy SpectrAlert, SpectrAlert Advance and L-Series devices on the same circuit.
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Surface mounting: use the SBBRL red wall surface mount back box; TR-2 is the red universal wall trim ring.
Related models
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P2WLED — the same 2-wire wall horn strobe in a white housing
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P2RLED-B — red, bilingual FIRE/FEU marking for Canadian applications
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P2RLED-P — red, plain housing with no FIRE marking
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P2RLED-SP — red, FUEGO marking
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P2GRLED — compact red wall horn strobe
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PC2RLED — red ceiling horn strobe; ceiling units use a different candela set (15, 30, 75, 95, 115, 150, 177 cd)
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SRLED — red wall strobe without a horn
Specifications taken from the System Sensor data sheet “L-Series and L-Series with LED Indoor Selectable Horns, Strobes and Horn Strobes,” document AVDS916-01 (10/03/2023). Manufacturer specifications are subject to change without notice.
