System Sensor 5624

The System Sensor 5624 Fixed Temperature Heat Detector will monitor homes and businesses for fires. It activates at temperatures of 194°F (90°C) and higher, making it best for areas that have very high average temperatures. It is good for areas that can't use standard smoke detectors.

When an area has high levels of fine airborne particles, gaseous fumes, or very high humidity, it's possible that false alarms can be caused by a photoelectric smoke detector. Some parts of the home where this is a concern include garages, attics, bathrooms, kitchens, equipment sheds, and more. Heat sensors overcome this problem, as they only activate via high temperatures, not based on airborne particulates. Since the 5624 activates at an unusually high fixed temperature, it should only be used in hot climates or buildings that have extremely high ambient temperatures.

Like most heat detectors, the 5624 is a very simple mechanical device that does not require any electrical power as part of its normal operation. Also like most heat sensors, the 5624 is a Normally Open (NO) device. It is a single-circuit device that operates using a Normally Open (NO) circuit. Upon detecting a temperature of 194°F (90°C) or higher, the circuit closes to trigger a short on the panel zone. When programmed correctly, this should trigger a fire alarm on the panel. As no power is needed, a heat sensor like the 5624 can be used on any hardwired system zone. You can also use this device with certain wireless transmitters like the Honeywell 5817CBXT for use with a wireless system.

All fire detection sensors on an alarm system, even non-life-safety heat sensors, should be set up with end-of-line resistors (EOLRs) for supervisory purposes. For Normally Open (NO) devices like the 5624, an EOLR is installed in parallel at the very last device in the circuit. This means that the resistor will connect across the two (2) wire terminals available on the 5624. For more information on proper installation, and limitations you may want to review the Limitations of Fire Alarm Systems. This document is put out by System Sensor to help ensure that fire detection sensors are installed and used properly.

Note that there is no rate-of-rise sensor inside the 5624. This is somewhat unusual, as standalone heat sensors often include this feature. Since the fixed temperature sensing component is single-use and non-restoring, there is no true way to test this sensor. Once the device's fixed temperature sensing component is activated, the entire 5624 Sensor must then be replaced. The device is a hardwired sensor, and it has a diameter of 4.57" (11.6cm). Its base height is 1.69" (4.3cm). The sensor weighs 6oz (170g). Mounting hardware comes included.

If you'd like to use a heat detector with both a high-threshold heat-sensing feature and a rate-of-rise sensor built-in, check out the System Sensor 5622. The only difference between it and the System Sensor 5624 is the inclusion of a rate-of-rise heat sensor in addition to the fixed-heat sensor. If you don't need such a high-temperature threshold, you can check out the System Sensor 5621. This is a dual-circuit sensor with a 135℉ (57℃) fixed-temperature sensor and the standard rate-of rise sensor that activates when the temperature rises 15℉ (8.33℃) or more per minute.

Specifications

• Sensor Type: Hardwired Heat
• Number of Circuits: Single Normally Open (NO) Circuit
• Fixed Temperature Threshold: 194℉ (90℃), Non-Restoring Single Use
• UL Maximum Spacing (10-foot ceiling): 50' x 50' (15.2m x 15.2m)
• Operating Voltage/Contact Ratings (Resistive): 6 - 125 VAC / 3A ; 6 - 28 VDC / 1A ; 125 VDC / 0.3A ; 250VDC / 0.1A
• Maximum Installation Temperature: 150℉ (65.6℃)
• Operating Humidity: 5 to 95% Relative Humidity Non-Condensing
• Wire Gauge Supported by Terminals: 14 - 22 AWG
• Back Box Mounting: 3.5" octagonal ; 4" octagonal ; Single Gang ; 4" square with a square to round plaster ring
• Dimensions (w/Mounting Bracket): Diameter: 4.57" (11.6cm) ; Height: 1.69 inches (4.3cm)
• Weight: 6 oz. (170g)
• SKU: BK-5624