System Sensor 4451HT Plug-in Fixed - Manual

D400-54-00 1 I56-0690-005R
4451HT and 4451HTA
Plug-in Fixed Intermediate
Temperature Thermal Detectors
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
Before Installing
This detector must be installed in compliance with the con-
trol panel installation manual and meet the requirements of
the authority having jurisdiction. In addition, the National
Fire Protection Association has published codes, standards,
and recommended practices for the installation and use of the
above appliances (NFPA 72). For installation in Canada, refer
to CAN/ULC-S524 and CEC Part 1, Sec. 32. Therefore, the in-
staller must be familiar with these requirements, with local
codes, and any special requirements of the authority having
jurisdiction.
NOTICE: This manual should be left with the owner/user of
this equipment.
IMPORTANT: This detector must be tested and maintained
regularly following NFPA 72 requirements. The detector should
be cleaned at least once a year.
General Description
The 4451HT and 4451HTA detectors are fixed intermediate
temperature alarm thermal detectors utilizing a state-of-the-art
dual thermistor sensing circuit. These detectors are designed
to provide open area protection with 50-foot spacing capabil-
Specifications
Diameter:
4.1 inches (104 mm)
Height: 2.1 inches (53 mm)
Weight: 5 ounces (150 g)
Installation Temperatures: 32° to 150°F (0° to 66°C)
Operating Humidity Range: 10% to 93% Relative Humidity
Latching Alarm: Reset by momentary power interruption
Sensitivity: 190°F (88°C)
Operating Voltage: 15-35 VDC
Standby Current: 100 µA
ity, and are to be used with compatible control panels only.
This listed spacing is based on a 10′ ceiling height and should
be reduced based on the table in Figure 1 for ceilings higher
than 10′.
Two LEDs on each detector light to provide 360° visibility of
the detector indication. Remote LED annunciator capability is
provided as standard, and the RA400Z remote LED annuncia-
tor is available as an optional accessory.
Base Selection And Wiring Guide
Refer to the installation instructions for the plug-in detector
bases for base selection and wiring instructions. System Sen-
sor has available a variety of detector bases for these heat de-
tectors, including 2-wire applications with and without relays
and/or current limiting resistors for use with control panels
that require one. These detectors are only to be used with 400
and 400B series bases.
Install the System Sensor plug-in base to be used with the
detector following the instructions in the base manual.
Installation
NOTE: All wiring must conform to applicable installation
codes and regulations.
I56-0690-00
5R
Ceiling Height Above Up To And Including
Percent Of Listed Spacing
(ft) (m) (ft) (m)
0 0 10 3.05 100
10 3.05 12 3.66 91
12 3.66 14 4.27 84
14 4.27 16 4.88 77
16 4.88 18 5.49 71
18 5.49 20 6.10 64
20 6.10 22 6.71 58
22 6.71 24 7.32 52
24 7.32 26 7.93 46
26 7.93 28 8.54 40
28 8.54 30 9.14 34
Figure 1. Heat detector spacing reduction based on ceiling height: