D400-54-00
1
I56-690-04
4451HT and 4451HTA Plug-in
Fixed Intermediate Temperature
Thermal Detectors
INSTALLATION AND MAINTENANCE INSTRUCTIONS
A Division of Pittway
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
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 installer 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.
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
µ
A
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 be used with compatible control panels only.
Two LEDs on each detector light to provide 360
°
visibility
of the detector indication. Remote LED annunciator capa-
bility is provided as standard, and the RA400Z remote LED
annunciator 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
Sensor has available a variety of detector bases for these
heat detectors, 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.
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