Kidde LHS User Manual
LHS™ Linear Heat Sensor
Installation Instructions
73-202
DESCRIPTION
The LHS™ Linear Heat Sensor cable is a flexible, durable
and cost-effective fixed-temperature fire detector, suitable
for protecting a wide range of commercial and industrial
fire applications.
LHS is a small diameter cable capable of detecting heat
from a fire over its entire length. The sensor cable consists
of a twisted pair of 19 AWG copper coated steel conductors
covered by a temperature sensitive insulation, and protected
by either a plastic braid or jacket for various environmental
applications (see Figure 1).
LHS is designed for open area as well as proximity detection. A wide range of jackets and operating temperatures
(see Table 1) are available for proper system design, including confined areas or harsh environments which prohibit the use of other forms of detection. LHS cable is
compatible with any Fire Control Panel that is capable of
accepting contact closure type initiating devices.
The LHS linear heat detector is Factory Mutual Approved.
An FM Approved installation requires the LHS cable to be
connected to an FM Approved Fire Control Panel.
Effective: June 2006
OPERATION
The heat from a fire causes the LHS cable’s special insulation to melt at a specific temperature, allowing the two conductors to short together, thus creating an alarm condition
on the Fire Control Panel. The LHS cable may also be used
as a stand-alone contact device. The LHS normal operating state is an open circuit.
Conductor
Tinned
copper-covered
steel
Insulation
Temperature-sensitive
thermoplastic or
fluoropolymer
Figure 1. Cable Construction
Jacket
Thermoplastic strip
braid, PVC, nylon, or
fluoropolymer
Table 1. LHS Sensor Cable Specification
Part Number:
656 ft (200 m) length roll
3,280 ft (1000 m) length roll
Alarm Temperature
Ambient Storage Te mp. *
Min. Installatio n Temp.
Min. Operating Temp. **
Application
Approved Spacing
Flame Detection
Outer Jacket Materia l
Outer Jacket Color
Conductor Insulation
Conductor Color
External Diameter
Electrical Rating
Conductor Resistance
Conductor Capacitance
Insu la tio n Rat in g
Weight
* Do not store in direct sunlight. ** When not subjected to vibration.
73-200000-001
73-201000-001
155°F (68° C) 155°F (68° C) 185°F (8 5°C) 185°F (85 °C ) 220°F (105° C) 350°F (17 6° C) 465° F (24 0° C)
Up to 113°F (45° C) Up to 113°F (45° C) Up to 113° F (45° C) Up to 113°F (45° C) Up to 158° F (70° C) Up to 221° F (105° C) Up to 39 2° F (200° C)
5°F (-15° C) 5°F (-15° C) 5°F (-15°C) 5°F (-15° C) 32°F (0° C) 32°F (0° C) -4°F (-2 0°C)
-40°F (-40° C) -40°F (-40°C) -40°F (-40°C) -40°F (-40° C) -22°F (-30° C) -40°F (-40° C) -58° F (-50° C)
Indoor Only Indoor/Outdoor Indoor Only Indoor/Outdoor Indoor/Outdoor Indoor/Outdoor Indoor/Outdoor
20 ft. (6 m) maximum 20 ft. (6 m) maximum 20 ft. (6 m) maximum 20 ft. (6 m) maximum 20 ft. (6 m) maximum Proximity Detection Proximity Detectio n
5 seconds (max) 5 seconds (max) 5 seconds (max) 5 seconds (max ) 12 seconds (max) 20 seconds (max) 20 seconds (max)
Polypropylene Braid Nylon Polypropylene Braid Nylon PVC PVC FEP
Red/Green Tracer
EVA EVA EVA EVA Polythene Polypropylene FEP
1 Black
1 Red
0.146 in ch (3. 7 mm) 0.132 inc h (3. 35 mm) 0.146 inc h (3.7 m m) 0.132 inch (3. 35 mm) 0.1 67 inc h (4.25 m m) 0. 171 inc h (4. 35 mm) 0.138 in ch (3.5 mm)
20.2 1 pF/ft.
(66.32 pF/m)
11.29 lb./1000 ft.
(16.8 kg/km)
73-200000-011
73-201000-011
Black
Marke d H804 0N
1 Black
1 Red
20.21 pF/ft.
(66.32 pF/m)
10.65 lb./1000 ft.
(15.85 kg/km)
1000 megohm per 3280 ft. (1000 m) afte r 1 minute @ 500 Vdc Minimum
73-200000-002
73-201000-002
Red /B lac k Trace r
1 Blac k
1 Red
30.48 ohms/1000 ft. @ 68°F (1 0 0 o hms/1 0 0 0 m) @ 2 0 °C
25.42 pF/ft.
(83.41 pF/m)
11.29 lb./1000 ft.
(16.8 kg/km)
73-200000-012
73-201000-012
Black
Marke d H8045N
1 Blac k
1 Red
1 Amp maximum, 110 Vdc maximum
25.4 2 p F /ft.
(83.41 pF/m)
10.65 lb./10 00 ft.
(15.85 kg/km)
73-200000-003
73-201000-003
19.9 6 pF/ft.
(65.48 pF/m)
15.25 lb./1 000 ft.
(22.7 kg/km)
Black Red White
1 Blac k
1 Red
73-200000-004
73-201000-004
1 Black
1 Blac k /Whi te
17.52 pF/ft.
(57.48 pF/m)
12.67 lb./1000 ft.
(18.85 kg/km)
73-200000-005
73-201000-005
1 Black
1 White
19.22 pF/ft.
(63.07 pF/m)
14.65 lb./1000 ft.
(21.8 kg/km)
DESIGN CONSIDERATIONS
The system design and installation must follow accepted
principles of fire protection engineering, as well as comply
with applicable codes and standards:
• NFPA-72, National Fire Alarm Code
• NEC 760, National Electric Code
• Any local installation requirements
• Requirements of the Authority Having Jurisdiction
(AHJ)
1. Selection of the appropriate part number for a specific
application must take into consideration the temperature of the hazard, the ambient temperature, and the
environment where the sensor is installed.
2. For open area protection, LHS must be mounted at the
ceiling, using the FM Approved spacing between p arallel runs. Distances from walls are half the spacing
shown. The thermal path to the LHS sensor must not
be obstructed. Maintain a 1” (25 mm) distance from the
ceiling for fastest detection.
3. For proximity detection, the LHS sensor must be tight
against the object being protected, to insure good thermal transfer. Exercise care to insure that vibration and
sharp edges do not cause abrasions to the cable, which
could result in a false activation.
4. Outdoor applications may need to be shielded from direct sunlight to prevent the LHS sensor’s operating temperature and/or maximum ambient temperature from
being exceeded, which may cause a false activation.
5. To use LHS sensor in hazardous locations (Class 1
Groups A,B,C,D; and Class 2 Groups E,F,G), FM Approved intrinsic safety barriers must be used to isolate
the sensor from the control panel.
INITIA TING CIRCUIT WIRING
The LHS sensor connects to any Fire Control Panel (FCP)
as a dry-contact initiating device. Follow the installation instructions of the FCP for specific electrical requirements of
the initiating circuit (see figure 2).
1. The LHS sensor can be run as a Class B or Class A
circuit loop, with no T -t ap s.
2. The maximum LHS sensor zone length is determined
by the electrical characteristics of the FCP initiating circuit. Use the LHS resistance and capacitance as shown
in Table 1 to calculate the maximum length. For example, a FCP with input loop resistance of 50 ohms will
allow 820 feet (=50/(2 x 0.03048)) of LHS sensor.
3. If the FCP is some distance away from the protected
space, install LHS sensor only in the protected space,
and use lead-in cable to connect the LHS sensor to the
FCP. The lead-in cable can be any copper wiring approved for fire alarm use.
4. The LHS sensor in the protected space does not need
to be contiguous. Copper wiring approved for fire alarm
use may be used to connect the separate lengths of
LHS sensor.
5. If the initiating circuit is run as Class B (2 wire), then an
end-of-line device compatible with the FCP must be
installed at the end of the LHS sensor cable.
6. If allowed by the AHJ, other initiating devices (smoke
detectors, manual stations, etc.) may be installed on
the same zone as the LHS sensor. The LHS sensor
cable can be wired directly between these other devices.
Fire
Control
Panel
Initiating
Circuit
Lead-In
Cable
LHS Sensor
Cable
Junction
Box
End-of-Line
Device
Junction
Box
Figure 2. FCP with LHS Sensor Cable
SENSOR CABLE MOUNTING
The LHS sensor cable must be mounted in a professional
manner, in accordance with any applicable codes and requirements. The recommended mounting techniques described below do not preclude the use of alternate means
that are more suitable for a specific installation so long as
such means are acceptable to the local AHJ.
CAUTION
!
Where subject to mechanical damage, the
sensor cable should be protected to prevent
damage which could result in false activation.
> When designing the LHS layout, sensor cables
should be located where they will not be subject
to physical damage.
> If metal fasteners are used, non-metallic
bushings must be used to prevent chafing or
crushing of the sensor cables.
1. The cable should be adequately supported to prevent
sagging. It is not necessary to tension the cable, however on straight runs it is recommended that the cable
is supported every 3 feet (1 m). Reduced spacing may
be employed to suit local codes or conditions such as
around corners and transition points. Tension on the
sensor cable cannot exceed 50 Newtons. The sensor
cable can be bent around a radius no smaller than 2”
(50 mm)
2. Wherever possible, the sensor cable should be installed
in a continuous run with as few splices as possible.
3. The sensor cable should be the last item installed on a
project. If not installed last, it should be temporarily supported by cable ties to minimize the risk of damage.
Care should be taken to prevent damage due to foot
traffic, mechanical impact, kinking or any external heat
sources.
2
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