User Manual

Chapter 3
Installing the system
25
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 on
page 33).
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
Hardwired contacts
To set up HW1 I/O and/or HW2 in for hardwired contacts, make the required connections as described under
below, then proceed to the Programming on page 33 to add (learn) them into panel memory.
You can connect hardwired reed switches (normally closed loop only) to HW1 I/O (if not being used for a
hardwired siren) and/or HW2 in.
Note: Connect only normally closed (NC) reed switches to HW1 I/O and/or HW2 in. Other types of hardwired detectors should
not be used.
The total resistance of the wire loop must not exceed 3 ohms. This allows you to use up to 200 ft. (61 m) of
two-conductor, 22-gauge stranded wire.
Connect hardwired reed switches to the panel using a 47 kohm resistor (not a 4.7 kohm resistor) as shown in
Figure 7. The resistor must be connected at the last switch in the circuit.
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