D550-10-00
1
I56-2600-02R
PF24 Directional Sounder
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
General Description
Before installing, please read the Directional Sound
Applications Guide, available through System Sensor. The
installation must meet the requirements of the authority
having jurisdiction. Directional sounders are used as sup-
plemental signals on a fire alarm system to aid in the evac-
uation of building occupants. Although directional sound-
ers may be connected to notification appliance circuits
(NAC) for fire alarm service, they are not a replacement for
audible or visible notification appliances as required by the
authority having jurisdiction.
The directional sounder can be installed in systems using
24 Volt DC regulated power supplies only. It is not approved
for use with FWR unregulated power supplies.
Directional sound is a broadband, multi-frequency sound.
The sound source is easily and quickly located by building
occupants, making it ideal for rapid building evacuation.
The Sounder incorporates four different pulse patterns.
The patterns consist of pulses of broadband noise. The four
patterns can be used to create an egress pathway out of a
building. The sound pattern becomes faster as the building
occupant approaches the perimeter exit. Three additional
tone pulses can be added to each of the four pulse patterns.
The first two tone pulses are used to alert occupants that
they are approaching a stairway and need to proceed either
up or down. The second tone pulse is a special tone used
to identify areas of refuge.
Specifications
Mechanical
Input terminals:
12 – 24 AWG
Sounder size:
4 inches (101mm)
Grille Size:
4
7
/
8
″
(127mm)
Electrical
Voltage Input:
Regulated 24 Volts
Operation Voltage Range:
16 to 33 Volts
Operating Humidity Range:
10% to 93% relative humidity non-condensing
Frequency range:
20 Hz to 20 kHz
Operating Temperature range:
32° to 120°F (0° to 49°C)
Power:
1
/
4
″
,
1
/
2
″
, 1, 2 and 4 Watts, selectable
Listings:
UL 464 Directional Sounder, supplemental notification appliance
NOTICE:
This manual should be left with the owner/user of the equipment.
Power Supply Considerations for
Directional Sounders
Panels typically supply DC filtered voltage or FWR (full-
wave rectified) voltage. This device is only compatible
with DC filtered supplies and must not be used with panel
supplies that are FWR. Be certain the sum of all the device
currents do not exceed the current capability of the panel
power supply. Calculations are based on using the device
current found in Table 1 and must be the current specified
for the installed settings of the device.
Wire Sizes
The last device on the circuit must have sufficient voltage
to operate the device within its rated voltage range. When
calculating the voltage available to the last device, it is nec-
essary to consider the voltage drop due to the resistance of
the wire. The thicker the wire, the less the voltage drop.
Generally, for purposes of determining the wire size neces-
sary for the system, it is best to consider all of the devices
as “lumped” on the end of the supply circuit (simulates
“worst case”).
Typical wire size resistance:
18 AWG solid: Approximately 8 ohms/1,000 ft.
16 AWG solid: Approximately 5 ohms/1,000 ft.
14 AWG solid: Approximately 3 ohms/1,000 ft.
12 AWG solid: Approximately 2 ohms/1,000 ft.
Example: Assume you have 10 devices on a zone and each
requires 50mA average and 2000 ft. of 14 AWG wiring (total
length = ou return). The voltage at the end of the
loop is 0.050 Amps per device
×
10 devices
×
3 ohms/1000
ft.
×
2000 ft. = 3 volts drop.
I56-2600-02R
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