INSTALLATION AND MAINTENANCE INSTRUCTIONS
6424 Projected Beam Type
Smoke Detector
3825 Ohio Avenue, St. Charles, Illinois 60174 1-800-SENSOR2, FAX: 630-377-6495 www.systemsensor.com
Specifications |
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General |
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Range: |
30 to 330 Feet (9.1 to 100.6 m) |
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Sensitivity: |
30% ±5% Total Obscuration, or |
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55% ±5% Total Obscuration |
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Spacing: |
30 to 60 Feet (9.1 to 18.3 m) |
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Response Time: |
Alarm: |
15 Seconds Max. |
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Trouble: |
15 Seconds Max. |
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Trouble Condition: |
95% or More Obscuration |
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Improper Initial Alignment |
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Self-compensation limit reached (service needed) |
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Test/Reset Features: |
Obscuration Filters (ALARM/NO ALARM) |
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Local Alarm Reset Switch |
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Remote Test and Reset Switch Capability |
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(compatible with RTS451 Test Station with Magnet) |
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Indicators: |
Alarm: |
Remote Output, Local LED (red) |
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Trouble: |
Remote Output, Local LED (yellow) |
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Normal Operation: |
Local LED (flashing green) |
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Alignment Aid: |
LED Bar Graph (4 red LEDs) |
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Relays: |
Alarm; Trouble |
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Environmental |
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Temperature: |
–22°F to 131°F (–30°C to 55°C) |
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Humidity: |
10% to 93% RH Noncondensing |
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Mechanical |
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Weight: |
Receiver: |
1.5 lbs (680 g) |
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Transmitter: 1.3 lbs (590 g) |
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Mounting: |
Ceiling or Wall, Separate Mounting Brackets Provided |
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Wiring: |
Plug with Attached Cable |
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Adjustment Angle: |
Ceiling: |
±30° Horizontal/60° Vertical |
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Wall:±90° Horizontal/60° Vertical |
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Electrical (Receiver) |
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Voltage: |
20 to 32 VDC |
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Maximum Ripple Voltage: |
6.0 volts (Peak-to-peak) |
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Current (24 VDC): |
Avg. Standby: |
10mA Max. |
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Avg. Alarm: |
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28.4mA Max. |
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Avg. Trouble:27.1mA Max. |
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Start-up Surge: |
19mA Max. |
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Relay Contacts: |
.5A at 30 VAC/DC |
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Reset Time: |
.6 Seconds Max. |
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Start-up Time (after 5 min. reset): 1 Minute Maximum |
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Power Loss: |
Retain Memory for 5 Minute Minimum |
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Electrical (Transmitter) |
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Voltage: |
18.8 to 32 VDC |
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Maximum Ripple Voltage: |
5.6 volts (Peak-to-Peak) |
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Avg. Current (24 VDC): |
10mA Max. |
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D400-18-00 |
1 |
I56-494-13R |
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PRINTED IN MEXICO |
Before Installing
Please thoroughly read this manual and applicable sections of System Sensor’s Projected Beam Detector Application Guide. Copies of this manual are available from System Sensor.
General Description
System Sensor Model 6424 is a long range projected beam smoke detector designed to provide open area protection. It is to be used with UL-listed, separately supplied power (4-wire) control panels only. The detector consists of a separate transmitter and receiver. Smoke entering the area between the transmitter and receiver causes a reduction in signal at the receiver. When the obscuration reaches one of two predetermined thresholds (chosen with a switch in the receiver), the detector generates an alarm signal. Complete blockage of the beam causes a trouble signal to avoid false alarms. Slow changes in obscuration due to a build up of dirt or dust on the lens of the detector are compensated for by a microcontroller which continuously monitors the signal strength and periodically updates the alarm and trouble thresholds. When the self-compensation circuit reaches its limit, the detector generates a trouble signal, indicating the need for service.
Three LEDs at the receiver indicate the status of the detector: a red LED for alarm, a yellow LED for trouble, and a pulsed green LED for standby operation. The alarm signal latches and can be reset by a momentary power interruption, by using the remote reset input to the receiver if using the remote test/reset station model RTS451, or with the local reset button located behind the rear door in the receiver. A trouble signal automatically resets upon removing the cause of trouble. In addition to these indicators, there are four LEDs on both the receiver and the transmitter which are used as a beam alignment aid. No additional equipment is needed for alignment of the beam.
Each detector contains one Form A (normally open) contact for alarm signals and one Form B (normally closed) contact for trouble signals. Supervision of power is accomplished by installing a Power Supervisory End-of-Line Relay Module (model A77-716) at the end of the detector power loop. When power is applied to and through the detectors, the EOL Power Supervisory Module is energized. The relay contacts, along with the detector’s trouble relay contacts, can provide a closed series circuit in the control panel’s alarm-initiating loop. A loss in power or a trouble condition at the detector causes the respective EOL or trouble relay to open, resulting in a trouble signal at the control panel.
Parts List |
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Description |
Quantity |
Receiver Unit |
1 |
Transmitter Unit |
1 |
Receiver Wiring Cable |
1 |
Transmitter Wiring Cable |
1 |
Wall Mounting Bracket |
2 |
Ceiling Mounting Bracket (inside part) |
2 |
Ceiling Mounting Bracket (outside part) |
2 |
Wall Bracket Screw |
2 |
Ceiling Bracket Screw |
2 |
Washers |
4 |
Allen Wrench |
1 |
Instruction Manual |
1 |
Test Filter |
1 |
Cable Exit Plug |
1 |
Hole Plug |
1 |
Detector Placement
This section of the manual discusses the placement of projected beam detectors. Though this information is based upon industry expertise, it is intended to be used only as a technical guide. Always comply with the requirements of applicable codes and standards such as, NFPA 72, National Fire Alarm Code, as well as directives of the Authority Having Jurisdiction (AHJ). For general information on the placement of detectors, read System Sensor’s Projected Beam Detector Application Guide.
Projected beam detectors are usually located with their beams parallel to the ceiling. However, they can be mounted vertically or at any angle to protect the area involved. Since beam detectors sense the smoke buildup over a distance, they are ideal for locations with high ceilings. They can also be mounted on a wall or ceiling below the level of a spot type detector, reducing the effects of air stratification. Some typical locations would include large areas with high ceilings such as atriums, warehouses, and factories.
NOTE: Projected beam smoke detectors should always be mounted to stable mounting surfaces. See the MOUNTING LOCATION section for details.
Some fire codes specify spacing on a given center-to-center distance between detectors under ideal conditions. These spacings are based on rooms with smooth ceilings and no physical obstructions between the contents being protected and the detectors. Moreover, they are also based on a maximum ceiling height, and on the assumption that the value and the combustible nature of the contents of the room being protected do not warrant greater protection or closer spacing.
D400-18-00 |
2 |
I56-494-13R |
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PRINTED IN MEXICO |
In a room with a smooth ceiling, detectors should be spaced between 30 and 60 feet. One-half that spacing between the beam and the sidewall may be used as a guide. See Figure 1. The beam detector can be mounted with the receiver on one wall and the transmitter on the opposite wall, or both suspended from the ceiling, or any wall/ceiling combination. In the case of the ceiling mount, the distance from the end walls should not exceed one-quarter of the selected spacing (7.5 ft. maximum if the spacing is 30 ft.). See Figure 2.
Figure 3. Sloped ceiling (shed type):
3 FT. MAX.
S
S
Rx
Tx
1/2 S MAX.
Figure 1. Spacing for smooth ceiling (side view):
1/2 S 
S
12-18 in.
WALL
C0536-00
Figure 2. Spacing for smooth ceiling (top view):
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1/2 S MAXIMUM |
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1/4 S |
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TX |
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RX |
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MAX. |
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S |
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TX |
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RX |
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30 FEET MINIMUM |
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330 FEET MAXIMUM |
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C0537-00
In the case of peaked or sloped ceilings, codes may specify spacing of detectors by using horizontal spacing from the peak of the roof or ceiling. Figures 3 and 4 show the spacing for both the shed type and peaked type sloped ceilings On smooth ceilings, beam smoke detectors should generally be mounted between 12 and 18 inches from the ceiling. In many cases, however, the location and sensitivity of the detectors shall be the result of an engineering evaluation that includes the following: structural features, size and shape of the room and bays, occupancy and uses of the area, ceiling height, ceiling shape, surface and obstructions, ventilation, ambient environment, burning characteristics of the combustible materials present, and the configuration of the contents in the area to be protected.
C0538-00
Figure 4. Sloped ceiling (peaked type):
MOUNT DETECTOR
ANYWHERE IN THIS AREA
Rx
Tx
1/2 S |
S |
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3 |
FT. |
S |
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1/2 |
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MAX. |
S |
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3 |
FT. |
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MAX. |
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C0539-00
Mounting Locations
Beam detectors require a stable mounting surface for proper operation. A surface which moves, shifts, vibrates, or warps over time will cause false alarm or trouble conditions. Initial selection of a proper mounting surface will eliminate false alarms and nuisance trouble signals.
Mount the detector on a stable mounting surface, such as brick, concrete, a sturdy load-bearing wall, support column, structural beam, or other surface that is not expected to experience vibration or movement over time. DO NOT MOUNT the beam detector on corrugated metal walls, sheet metal walls, external building sheathing, external siding, suspended ceilings, steel web trusses, rafters, nonstructural beam, joists, or other such surfaces.
D400-18-00 |
3 |
I56-494-13R |
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PRINTED IN MEXICO |
Figure 5. Good and poor mounting surfaces:
Poor Mounting
Surface
Sheet
Metal
Concrete
or Bric
Poor Mounting |
Good Mounting |
Surface |
Surface |
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Good Mounting
Surface
C0540-00
Mounting Brackets
Install a ceiling or wall bracket for both the receiver and transmitter so that when mounted, the receiver and the transmitter will be at approximately the same height. Each ceiling bracket is composed of two parts that should be assembled with inside part between the ceiling and outside part as shown in Figure 5. The brackets should be mounted so that the slot in the front of each bracket is facing the other bracket. Mount the brackets only on solid structures of the building. To avoid unwanted alarms due to wall movement, do not mount to flexible walls, such as sheet metal walls (see MOUNTING LOCATIONS). Mount brackets with a separation of at least 30 feet but not more than 330 feet.
Figure 6. Ceiling mount bracket assembly:
C0741-00
Wiring Installation Guidelines
Always install all wiring in compliance with the National Electrical Code, and/or the applicable local codes, and any special requirements of the local authority having jurisdiction. Proper wire gauges and suitable means for strain relief should be used. The conductors used to connect beam smoke detectors to control panels and accessory devices should be color-coded to reduce the likelihood of wiring errors. Improper connections can prevent a system from responding properly in the event of a fire.
Installation wire used for the beam detector shall be no smaller than 18 gauge (1.0 square mm). For best system performance, all wiring should be twisted pair and installed in separate grounded conduit. Do NOT mix fire system wiring in the same conduit as any other electrical wiring. Shielded cable may be used to provide additional protection against electrical interference.
When installing the beam smoke detector in applications where flexible conduit will be used the BMB Beam Mounting Bracket kit must be installed with the cable before wiring the unit, as per the instructions supplied with the kit.
For wiring, first remove the pre-cut insulation from the conductor to be connected, then use a wire nut to connect the detector wire to the field wire. If the insulation has been removed from any unused conductors, make sure they are terminated properly to avoid short circuits. The transmitter can be wired in one of two ways. Figure 7 shows the transmitter permanently connected to the receiver. In this case the transmitter receives its power along with communication for the alignment aid through the connecting pair of wires. Figure 8 shows an alternative wiring configuration in which the transmitter receives its power from a remote power source. Temporary wiring can be installed for the communication needed for transmitter alignment
D400-18-00 |
4 |
I56-494-13R |
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PRINTED IN MEXICO |
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