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en | Installation considerations
Long-range beam smoke detectors
2017.03 | 7.0 | F.01U.068.899
Installation manual
Bosch Security Systems, Inc.
3
Installation considerations
Notice!
Smoke detector location
Correct smoke detector location and spacing is critical in a properly installed and operating
fire alarm system. For best results, place and space the detectors according to NFPA
Standard 72, The National Fire Code. This standard is available at a nominal cost from: The
National Fire Protection Association, Batterymarch Park, Quincy, MA 02269.
In all installations, good engineering judgment must prevail.
–
Do not use mirrors. Install detectors with a clear line-of-sight between the transmitter
and receiver.
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Clear the beam path of moving objects.
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Avoid areas with normal smoke concentrations, such as kitchens and garages.
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Do not install detectors where the normal ambient temperatures are below -22°F (-30°C)
or above +130°F (+54°C).
–
Set sensitivity based on the distance between the transmitter and receiver. For
information on selecting and setting sensitivity, see Design for the expected fire load, page
10 and Sensitivity setting, page 14.
3.1
Avoid air movement sources
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Place the transmitters/receivers where the beam path does not pass near heating and
cooling outlets. Do not mount where hot or cold air blows directly into the beam path.
Heating, ventilating, and air conditioning (HVAC) systems can blow smoke away from the
beam path. Smoke must accumulate in the beam path to be detected.
–
Do not mount heaters close to the beam path. Heat can distort the beam.
–
Test for beam distortion by monitoring the signal voltage. After setup, the detector’s
signal voltage must read between 3.8 VDC and 4.2 VDC. Monitor the voltage and turn on
all heating and cooling devices in the area. The signal voltage must not fluctuate more
than 0.20 VDC. If it does, relocate the detector to avoid disturbances.
3.2
Avoid bright light sources
Bright light can cause stray signals. Do not point the receiver toward any of the following
sources.
Sunlight:
Do not point the receiver directly at the rising or setting sun. If installing the receiver
where sunlight cannot be avoided, mount it slightly higher than the transmitter and aim it
down toward the transmitter. This causes the receiver to look below the horizon.
Bright Lights:
Do not mount the receiver where it looks at exposed bulbs of high-pressure
sodium, mercury vapor, and metal halide lights. For an illustration of areas in which to avoid
exposed lights, see the following figure.
Figure 3.1: Avoiding Exposed Lights
1 Receiver
2 Do
not
place bright lights in this area.
Summary of Contents for D296 Series
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