C o n v e n t i o n a l D e t e c t i o n 4451HT Plug-in 190°F Thermal Detector Model 4451HT 4451HTA Product Overviewthermistor sensing Dual solid-state 190°F (88°C) fixed temperature response Sealed against back pressure Low standby current Built-in tamper-resistant feature Flame retardant Noryl plastic The 4451HT fixed intermediate temperature thermal detector is designed to meet the stringent performance requirements of industrial and municipal fire detection/ alarm systems. The 4451HT thermal detector contains a unique dual thermistor sensing circuit to provide both maximum performance and solid state reliability. An RA400Z remote LED annunciator is available as an optional accessory. 360° field viewing angle of the visual alarm LEDs Easy plug-in of the head to base SEMS screws for easy wiring UL listed for 50 ft. spacing 3-year warranty S2101 7270-1209:105 3011446 326-94-E Specifications Operating Voltage Mounting base dependent (see char t below) Dimensions Diameter: 4.1 inches (104 mm) Height: 2.1 inches (53 mm) Standby Current 100 microamps Construction Flame retardant nor yl plastic Weight 5 ounces (150 g) Operating Temperature 32° to 150°F (0° to 66°C) Alarm Point 190°F (88° C) Wiring 12 to 18 gauge, twisted pair recommended Smoke Detector Spacing For detectors on smooth ceilings (as defined in NFPA 72), spacing of 50 feet (2500 sq. ft.) may be used. Other spacing may be used depending on ceiling height, high air movements, and other conditions or response requirements. Humidity Range 10% to 93% RH noncondensing Mounting Base Selection Guide Base Model No. Loop Type Current Limit Resistor Alarm Contact Type Nominal Voltage Current Draw on Alarm (mA) 10–100** B401B 2-wire* No — 24 VDC‡ B401BR 2-wire* Yes — 24 VDC‡ 22–62 B402B 4-wire Yes Form A & C 24 VDC 14–39 B404B 4-wire Yes Form A & C – Supy. 120 VAC 75 mA AC Max. B406B 2-wire* No Form C 24 VDC 12–100** B401† 2-wire* No — B401R† 2-wire* Yes — 24 VDC‡ 24 VDC‡ 10–100** 18–62 *Functionality contingent on panel compatibility. **Must be limited by control panel. †Flangeless base ‡Although B401B and B401 bases are capable of 12/24 VDC operation, they cannot be used with the 4451HT in 12V applications. Relay Contact Ratings: Resistive or Inductive (60% power factor) load. Form A: 2.0A at 30VAC/DC Form C: 0.6A at 110VDC, 2.0A at 30VDC 1.0A at 125VAC, 2.0A at 30VAC Wiring Guide (–) (+) (–) (–) 2 (+) RA400Z (–) (–) (–) 2 3 (+) 1 EOL RESISTOR 3 (–) RA400Z (OPTIONAL) RA400Z (OPTIONAL) 1 4 3 4 2 4 (+) 5 (+) (+) 1 (–) (+) 10 8 9 (+) COM N.C. N.O. (+) 5 1 10 8 9 AUXILIARY CONTACTS (–) 4 3 2 14 13 12 11 BLK 14 13 12 11 COM N.C. N.O. EOL RESISTOR OPTIONAL EOL POWER SUPERVISION RELAY, A77-716B OPTIONAL PURPLE (–) RA400Z RED (+) PURPLE (–) AUXILIARY CONTACTS ALARM CIRCUIT OPTIONAL FAULT TOLERANT WIRING B401B Wiring Diagram B402B Wiring Diagram (+) 120 VAC 120 VAC K AC K K (–) 3 RA400Z (OPTIONAL) 7 RA400Z (OPTIONAL) 4 1 6 EOL RESISTOR 3 2 (+) AC BL BL K AC AC BL BL (–) 14 13 12 11 5 10 8 9 2 4 1 COM N.C. N.O. (+) AUXILIARY FORM C CONTACTS 6 7 14 13 12 11 5 10 8 9 COM N.C. N.O. 4 3 2 14 13 12 SUPERVISION CIRCUIT 4 3 2 5 1 AUXILIARY FORM C CONTACTS 5 1 COM N.C. N.O. 14 13 12 COM N.C. N.O. AUXILIARY CONTACTS EOL RESISTOR AUXILIARY CONTACTS (–) ALARM CONTROL PANEL OPTIONAL NFPA CLASS “A” WIRING ALARM CIRCUIT B404B Wiring Diagram B406B Wiring Diagram Ordering Information Part No. Description Part No. Description 4451HT Fixed temperature thermal detector with alarm point at 190°F (88°C). Must be mounted to one of the B40X Series bases listed above (order separately). 4451HTA RA400Z Same as above, Canadian model Remote Annunciator for 2- or 4-wire systems, 3–32V. Use with most 400 Series plug-in detector bases. Fits standard U.S. single gang electrical box. Surface Mounting Kit. Provides for entry of surface wiring conduit. Use with B401 or B401R mounting bases only. SMK400 System Sensor Sales and Service System Sensor Headquarters 3825 Ohio Avenue St. Charles, IL 60174 Ph: 800/SENSOR2 Fx: 630/377-6495 www.systemsensor.com System Sensor Canada Ph: 905.812.0767 Fx: 905.812.0771 System Sensor in China Ph: 86.29.8832.0119 Fx: 86.29.8832.5110 System Sensor – Far East Ph: 85.22.191.9003 Fx: 85.22.736.6580 System Sensor – India Ph: 91.124.637.1770 x.2700 Fx: 91.124.637.3118 System Sensor Europe Ph: 44.1403.276500 Fx: 44.1403.276501 System Sensor in Singapore Ph: 65.273.2230 Fx: 65.273.2610 System Sensor – Australia Ph: 613.54.281.142 Fx: 613.54.281.172 System Sensor – Russia Ph: 70.95.937.7982 Fx: 70.95.937.7983 © 2004 System Sensor. The company reserves the right to change product specifications without notice. A05-0236-004•6/04•#883