S260-02 Photoelectric Heat and Smoke Detector

The SLR-24H photoelectric smoke detector utilizes two bicolored LED’s for indication of status. In a normal standby condition the LED’s flash Green every 3 seconds. When the detector senses that its sensitivity has drifted outside the UL listed sensitivity window the LED’s will flash Red every 3 seconds. When the detector senses smoke and goes into alarm the status LED’s will latch on Red.

The detector utilizes an infrared LED light source and silicon photo diode receiving element in the smoke chamber. In a normal standby condition, the receiving element receives no light from the pulsing LED light source. In the event of a fire, smoke enters the detector smoke chamber and light is reflected from the smoke particles to the receiving element. The light received is converted into an electronic signal.

Signals are processed and compared to a reference level, and when two consecutive signals exceeding the reference level are received within a specified period of time, the time delay circuit triggers the SCR switch to activate the alarm signal. The status LED’s light continuously during the alarm period.

The SLR-24H can be used in all areas where Photoelectric Smoke Detectors are required. The wide range smoke chamber makes the SLR-24H well suited for fires ranging from smoldering to flaming fires.

NS-4 Series, NS-6 Series, HSC-4R or HSC-xxx R Style bases may be used with the SLR-24H. Current interchangeable/compatible devices are the SIJ-24 ionization detector, SLR-24V photoelectric detector and the DCD-135/190 heat detectors.

All NS conventional devices are mechanically compatible with Hochiki America HSB, HSC and YBA type bases which may have been used in previous installations. Please check individual panel listings for compatible bases.

The contractor shall furnish and install where indicated on the plans, Hochiki America Model SLR-24H photoelectric smoke detectors. The combination detector head and twist-lock base shall be UL listed compatible with a UL listed fire alarm panel.

The base shall permit direct interchange with Hochiki America SLR-24V photoelectric detector, SIJ-24 ionization type smoke detector and/or DCD-135/190 fixed temperature/rate-of-rise heat detectors. The base shall be appropriate twist- lock base NS-4 Series, NS-6 Series, HSC-4R, or HSC-xxx R. In the event of partial or complete retrofit, the SLR-24 maybe used in conjunction with, or as a replacement for, Hochiki America detectors (SLK-24, SLK-24FH and the SIH- 24) on most HSB and HSC base applications.

The smoke detector shall have two flashing status LED’s for visual supervision. When the detector is in standby condition the LED’s will flash Green. When the detector is outside the UL listed sensitivity window the LED’s will flash Red. When the detector is actuated, the flashing LED’s will latch on Red. The detector may be reset by actuating the control panel reset switch.

The sensitivity of the detector shall be capable of being measured. It shall be possible to perform a functional test of the detector without the need of generating smoke. The sensitivity of the detector shall be monitored automatically and continuously to verify that it is operating within the listed sensitivity range.

To facilitate installation, the detector shall be non-polarized. Voltage and RF transient suppression techniques shall be employed to minimize false alarm potential. Auxiliary SPDT relays shall be installed where indicated.

The vandal-resistant, security locking feature shall be used in those areas as indicated on the drawing. The locking feature shall be field removable when not required.