System Sensor 5623 135F Dual-Circuit Fixed Temperature Heat Detector
Overview
The System Sensor 5623 is a fixed temperature heat detector rated for 135°F operation, designed to integrate into conventional and addressable fire alarm systems running 35VDC. The dual-circuit configuration allows you to deploy a single model across both two-wire conventional loops and addressable system topologies — reducing SKU complexity in mixed-architecture fire detection installations. This detector is built for commercial, industrial, and institutional environments where thermal response is the primary detection method: storage areas, warehouses, mechanical rooms, and spaces where smoke detection is impractical or where ambient dust and cooking vapors would trigger false alarms on photoelectric sensors.
Compatibility
The 5623 works with fire alarm control panels and addressable modules that accept conventional 24VDC or 35VDC heat detector circuits. Verify your panel's voltage specification and loop configuration before ordering — some systems require separate conventionaland addressable models, while others accept the dual-circuit design. Consult your fire alarm system documentation or your integrator to confirm pinout and configuration jumpers specific to your panel manufacturer.
Installation Notes
Mount on ceilings or walls in locations where thermal stratification affects smoke detection reliability — the 135°F setpoint responds only to genuine heat rise, not to ambient temperature swings. Ensure mounting location is free of HVAC dead zones that would delay thermal response. Connect the 5623 using 18 AWG or heavier twisted-pair wiring rated for fire alarm circuits; use approved fire alarm cable and maintain loop impedance within your panel's specifications. Do not install in areas subject to radiant heat sources (sun-facing skylights, heating units) that could cause nuisance alarms. Check local fire codes for required spacing and coverage — typical installations require one detector per 900 square feet in ordinary hazard areas.
