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Synchronize SpectrAlert Horns, Chimes and Strobes
• Each module can power two 3-amp circuits wired in
class B or one 3-amp circuit powered as Class A.
• Each module will synchronize 2 zones.
• Additional modules can be added and may be syn-
chronized to all other modules by interconnecting the
"slave" input and output terminals between modules.
Horn control wiring must be contained within common en-
closure of module.
Slave Out – Slave In wiring must be contained within either
the common enclosure of modules or enclosures within 20
feet of each other with wiring inside conduit.
If Zone 1 input is not powered or fails during alarm, the
notification devices attached to the Zone 2 output will not
be powered.
Controlling Sounder On/Off Over 2-Wires Using Mod-
ule Horn Control
• Connect the current source to the horn or chime control
input. If a zone output is used for the source, you must
use an EOL on the horn control input terminal.
• When multiple modules are used, the horn or chime
control circuits can be wired in parallel. If wired in par-
allel and a zone output is used from panel, use an EOL
on the last module for supervision.
Horn/chime control wiring must be contained within com-
mon enclosure of module.
Slave Out – Slave In wiring must be contained within either
the common enclosure of modules or enclosures within 20
feet of each other with wiring inside conduit.
If Zone 1 input is not powered or fails during alarm, the
notification devices attached to the Zone 2 output will not
be powered.
Special Considerations
A latching relay contact is provided in case the synchro-
nizing signal to the notification devices is interrupted. The
output can be wired so that a trouble signal will be annun-
ciated at the panel. If the synchronization pulse fails in the
MDL module, the strobes will shut off.
D900-14-00
CAUTION
CAUTION
CAUTION
CAUTION
CAUTION
CAUTION
firealarmresources.com
Figure 1: Single MDL Using Sync Error (for panels
with the capability to check for sync error)
NOTE: If zone 1 output of module is connected to strobes,
chime/strobes or horn/strobes, zone 1 input supply power
must be continuous for proper operation.
FACP
NAC1
NAC2
SEPARATE
MONITORING
INPUT
Figure 2:
NOTE: If zone 1 output of module is connected to strobes,
chime/strobes or horn/strobes, zone 1 input supply power
must be continuous for proper operation.
HORNS SILENCED OVER TWO WIRE CIRCUIT
MASTER MODULE HORN CONTROL CONNECTS
TO INTERRUPTABLE POWER SOURCE
MASTER MODULE
FACP #1
HORN
(+)
EOL
(+)
(–)
CONTROL
NAC1
(–)
(+)
ZONE 1
(+)
(–)
IN
NAC2
(–)
(+)
ZONE 2
(+)
NAC3
IN
(–)
(–)
SLAVE
(+)
IN
(–)
TEMP JUMPER OFF
SLAVE MODULE
FACP #2
HORN
)
( +
)
( –
CONTROL
(+)
ZONE 1
(+)
NAC1
IN
(–)
(–)
(+)
ZONE 2
(+)
NAC2
IN
(–)
(–)
SLAVE
(+)
(–)
IN
TEMP JUMPER OFF
2
HORN
ZONE 1
)
( +
CONTROL
OUT
)
( –
ZONE 1
ZONE 2
(+)
)
( +
(–)
IN
OUT
)
( –
ZONE 2
SYNC
(+)
)
( +
EOL
IN
ERROR
(–)
)
( –
SLAVE
SLAVE
(+)
)
( +
(–)
IN
OUT
)
( –
TEMP. JUMPER OFF
ZONE 1
)
( +
OUT
)
( –
TO NEXT
SPECTRALERT
DEVICE OR
ZONE 2
)
( +
OUT
)
( –
SYNC
)
( +
ERROR
)
( –
TO NEXT
SPECTRALERT
DEVICE OR
SLAVE
)
( +
OUT
)
( –
ZONE 1
)
( +
)
( –
OUT
TO NEXT
SPECTRALERT
DEVICE OR
EOL
ZONE 2
)
( +
OUT
)
( –
SYNC
)
( +
ERROR
)
( –
TO NEXT
SPECTRALERT
DEVICE OR
EOL
SLAVE
)
( +
OUT
)
( –
All SpectrAlert horns,
horn/strobes, and strobes
will operate in sync.
I56-0983-015R
A0262-00
EOL
EOL
A0182-00
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