Chapter 3
Installing the system
21
LD105 hardwired interior siren
Interior sirens must always be wired with a resistor in the circuit. For circuit supervision which allows the
panel to detect if the siren wire is cut (open), Hardwired Siren Supervision must be turned on. (See Chapter 4
Programming on page 29).
Note: Do not install the resistor at the panel terminals. This does not provide supervision of the wire.
Connect the LD105 hardwired interior siren (13-374) to the panel using a 4.7 kohm resistor (included with the
siren) as shown in Figure 6. The resistor must be connected across the siren wires as close to the siren as
possible.
Figure 6. Hardwired interior siren with supervision
HW1 I/O
HW1&2
DC out
HW2 in
9 VAC in
9 VAC in
Battery +
Battery -
4.7 kohm resistor
(located at siren)
Black
Red
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