Conventional Fire Alarm Control Panel (FACP) Integration
The KTI07001001HTDT conventional rate-of-rise and fixed-temperature heat detector is engineered for universal electrical interfacing with standard 2-wire conventional fire alarm control panels (FACPs) and initiating device circuits (IDC). The internal detection circuitry accepts an operating voltage range spanning from 9V DC to 33V DC, accommodating standard 12V DC and 24V DC conventional panel zone loops. System designers and commissioning engineers can readily calculate circuit loop loading using the unit's steady-state standby current of 50 µA and peak alarm current limit of 90 mA.
During system power-up and panel resets, the detector exhibits a start-up initialization time of 60 seconds with a transient start-up current draw of 170 µA. For complete alarm clearance following thermal activation, the host fire alarm control panel must provide an initiating circuit voltage reset cycle that drops loop power to less than 1V DC. Panels unable to discharge residual line voltage below this 1V DC threshold will fail to unlatch the internal solid-state holding circuit.
Mounting Base and Remote Output Interfacing
The detector package includes a matching regular 100 mm mounting base (compatible with the RE-314B conventional base platform). The terminal architecture features polarity-free wiring connections across the zone loop terminals, eliminating line-inversion faults during multi-drop field terminations. In addition to primary two-wire zone monitoring, the terminal assembly provides an integrated open-collector remote indicator output rated for a maximum load current of 15 mA. This auxiliary output interfaces directly with remote response indicator LEDs and above-ceiling or closed-room mimic indicators.
System Compatibility and Electrical Interface Parameters
| Interface / System Parameter | Specification / Compatibility Range | Engineering Consideration |
|---|---|---|
| Zone Panel Architecture | Standard 2-Wire Conventional Initiating Circuits | Interoperable with all standard conventional fire alarm panels |
| Loop Operating Voltage | 9V DC to 33V DC | Supports nominal 12V DC and 24V DC zone supplies |
| Panel Reset Threshold | Less than 1V DC | Circuit voltage must drop below 1V DC to clear latched state |
| Normal Standby Current | 50 µA @ continuous DC supply | Permits high detector density per conventional IDC zone |
| Start-Up Transient Current | 170 µA (60 s duration) | Factor into power supply turn-on in-rush calculations |
| Maximum Alarm Current | 90 mA (Max) | Dictates loop current-limiting resistor sizing at the FACP |
| Remote Output Terminal | 15 mA maximum (Open Collector) | Compatible with external remote indicator displays |
| Wiring Configuration | Polarity-free 2-wire connection | Prevents reverse-polarity wiring faults in the field |
| Base Mechanical Dimension | 100 mm diameter (46 mm overall height) | Direct surface ceiling mounting onto standard backboxes |
Environmental and Area Placement Compatibility
Operational compatibility requires indoor environmental parameters to remain within an operating temperature window of -10°C to 37.8°C and non-condensing relative humidity levels between 0% and 95% RH. The enclosure carries an ingress protection classification of IP42. Nominal system design mandates an installation spacing of 5 meters between adjacent heat detectors. Because the internal thermal sensor triggers on both a 59°C (138°F) fixed threshold and an 11.1°C/min (20°F/min) rate-of-rise gradient (evaluated on a 5-second internal sampling cycle), avoid mounting locations subject to rapid ambient temperature shifts such as direct hot-air HVAC discharges or industrial process exhausts.
