System Sensor SP2 User Manual
SpectrAlert SP2 Series
Wall Speaker/Strobes for
Fire Protective Signaling Systems
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
NOTICE: This manual shall be left with the owner/user of
this equipment.
General Description
The National Fire Protection Association (NFPA) has published standards and recommended practices for the speaker/strobes described in this manual. As a result, the
installer must be familiar with these requirements as well
as all local codes and special requirements of the authority
having jurisdiction.
The SpectrAlert SP2 series speakers can be operated with
distribution amplifiers having an output voltage of either
25 volts or 70.7 volts.
The speakers operate at any one of four input power levels.
The output sound level is selected at the time of installation, but can be changed, if necessary.
The speaker is also equipped with a capacitive input to
allow for DC supervision.
The SpectrAlert SP2 series strobe can be installed in systems
using 24-volt panels having DC or full-wave rectified (FWR)
power supplies. The strobes can also be installed in applications requiring synchronization (MDL required) or applications that do not require synchronization (no module
required).
The SpectrAlert SP2 series speaker/strobes are designed to
meet the requirements of most agencies governing these
devices, including: NFPA, ADA, The National Fire Alarm
Code, UL, CSFM, MEA. Also, check with your local
Authority Having Jurisdiction for other codes or standards
that may apply.
Power Supply Considerations For Strobes
Panels typically supply DC filtered voltage or FWR (fullwave rectified) voltage. The system design engineer must
D690-01-00 1 I56-1368-005R
For use with the following models: SP2R2415, SP2R2430, SP2R241575, SP2R2475, SP2R24110,
SP2W2415, SP2W2430, SP2W241575, SP2W2475, SP2W24110
U.S. Patent Nos. 5,593,569; 5.914,665; 5,850,178; 5,598,139; 6,049,446; 6,127,935
Specifications: Speaker
Mechanical
Input Terminals: 12 to 18 AWG (3.31 to 0.82 mm2)
Speaker Size: 4 inches (101 mm)
Overall Dimensions: 8.25″ x 4.9″
Electrical
Voltage Input: 25 volts or 70.7 volts (nominal)
Frequency Range: 400 – 4000 Hz
Power:
1
⁄4, 1⁄2, 1 and 2 Watts
Operating
Temperature Range: 32° to 120°F (0° to 49°C)
Listings: UL S4048 (Speaker/Strobe), S5512 (Strobe)
Note for Strobes: Do not exceed 1) 16-33 Voltage range limit, 2) Maximum number of 70 strobe lights when connecting
the MDL Sync module with a maximum line impedance of 4 Ohms per loop and 3) Maximum line impedance as required
by the fire alarm control manufacturer.
Specifications: Strobe
Voltage Range: DC or Full-Wave Rectified
20 to 30 volts, (21 to 30 volts with MDL
module)
Flash Rate: 1 flash per second
Light Output: Models with 1575 are listed at 15 candela
per UL1971 but will provide 75 candela on
axis (straight ahead).
Models with 15, 30, 75 or 110 are rated for
that candela.
calculate the number of units used in a zone based on the
type of panel supply. Be certain the sum of all the device
currents do not exceed the current capability of the panel.
Calculations are based on using the device current found in
Table 2 and must be the current specified for the type of
panel power supply used.
Wire Sizes
The designer must be sure that the last device on the circuit has sufficient voltage to operate the device within its
rated voltage. When calculating the voltage available to the
last device, it is necessary 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 necessary 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 50 mA average and 2000 Ft. of 14 AWG wiring
(total length=outgoing+return). The voltage at the end of
the loop is 0.050 amps per device × 10 devices × 3
ohms/1,000 ft. × 2000 ft =3 volts drop.
The same number of devices using 12 AWG wire will produce only 2 volts drop. The same devices using 18 AWG
wire will produce 8 volts drop. Consult your panel manufacturer’s specifications, as well as SpectrAlert’s operating
voltage range to determine acceptable voltage drop.
Note: If class “A” wiring is installed, the wire length may
be up to 4 times the single wire length in this calculation.
Signal levels exceeding 130% rated signal voltage can
damage the speaker. Consequently, an incorrect tap connection may cause speaker damage. This means that if a
25V tap is selected when a 70.7V amplifier is being used,
speaker damage may result. Therefore, be sure to select
the proper taps for the amplifier voltage/input power
level combination being used.
2 W 1 W 1/2 W 1/4 W
84 81 78 75
UL
Reverberant
(dBA @ 10 ft.)
2 W 1 W 1/2 W 1/4 W
87 84 81 78
Anechoic
(dBA @ 10 ft.)
Installation
All wiring must be installed in compliance with the
National Electrical Code (NEC) and applicable local codes
as well as special requirements of the authority having
jurisdiction, using the proper wire size. This also includes
all applicable NFPA Standards, ANSI/UL 1480, UL 1971 and
NEC 760.
Electrical
1. Connect the speaker/strobe as shown in Figure 1. Keep
in mind that even though the speaker and strobe are a
single mechanical unit, they are electrically independent
and require separate power sources.
NOTE: Do NOT loop electrical wiring under terminal
screws. Wires connecting the device to the control
panel must be broken at the device terminal connection in order to maintain electrical supervision.
NOTE: Supply power for strobe must be continuous for
proper operation.
2. See Figure 2 as an example of how to select a
1
⁄4
Watt
input when a 25 volt amplifier is being used. Notice that
the header, SW1, has two shunts. One shunt is used to
select either 25 or 70.7 volts input. The other shunt is
used to select input power of
1
⁄4, 1⁄2, 1 or 2 Watts. Table 1
lists the UL reverberant and anechoic output sound levels for each power tap on the SP2 series speaker/strobes.
Figure 1. Electrical connections:
Figure 2. Voltage and Power Selection:
25.0V
70.7V
2W
1W
1/2W
1/4W
25.0V
70.7V
2W
1W
1/2W
1/4W
CORRECT
SW1
SW1
INCORRECT
TO NEXT
STROBE OR EOL
INPUT FROM
POWER SUPPLY
INPUT FROM
AMPLIFIER
TO NEXT
SPEAKER OR EOL
STROBESPEAKER
Table 1. Sound levels for each transformer
power tap:
CAUTION
DC FWR DC FWR DC FWR
50 61 43 60 38 60
56 65 49 64 44 62
78 84 67 82 58 72
145 170 123 159 102 141
169 220 140 191 115 174
15
15/75
30
75
110
AVERAGE CURRENT (mA)
24V Models
20V 24V 30V
DC FWR DC FWR DC FWR
135 204 135 208 135 185
150 199 150 207 150 198
183 201 183 219 183 216
350 440 340 460 330 480
460 560 450 570 420 620
PEAK CURRENT (mA)
24V Models
20V
24V
30V
DC FWR DC FWR DC FWR
97 129 116 152 147 198
97 135 116 164 147 211
97 129 116 152 147 198
190 240 230 280 290 380
190 230 220 290 290 370
IN RUSH CURRENT (mA)
24V Models
20V 24V 30V
Candela
Table 2. Strobe current draw measurements:
D690-01-00 2 I56-1368-005R
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