15
Dual Zone Digital Location Control Unit Installation and Operation Manual
Wiring diagrams
The following section provides details of how to configure the wiring for the
detection zone circuits and relay outputs.
Connecting Alarmline II Digital Sensor Cable
There are two LHD detection zones on the control unit, used to monitor two
separate installations of sensor cable. These are monitored circuits which
require an end-of-line monitoring resistor value 1 k
Ω.
The maximum length of sensor cable that can be connected to an individual zone
is 3000 m (9842.5 ft.) and the minimum length is 1 m (3.28 ft.).
Zone circuit wiring is shown in Figure 8 below.
Figure 8: Zone circuit wiring
The interposing cable and connecting junction box shown are optional. When
using an interposing cable the control unit is calibrated to distinguish this from the
sensor cable. Interposing cable is monitored by the control unit for open circuit
fault conditions. See “Interposing cable” on page 14 for more information.
If the installation does not require an interposing cable, the sensor cable is
connected directly to the control unit’s LHD zone terminals.
Any junction boxes used must be of a suitable specification for the area where
they are installed.
Interfacing with the main fire alarm system
Outputs are provided to enable the control unit to signal status information to a
fire alarm system. Each LHD zone on the control unit has its own status outputs
(1 fire output and 1 fault output per zone) allowing individual reporting to the main
fire alarm system.
The status outputs can be interfaced to any supervised input (for example, a
detection zone on a conventional fire panel or an addressable loop interface on
an addressable fire panel).
Cables for connecting the status outputs to the main fire alarm system must be
suitably fire rated cable.
The wiring configuration to monitor the outputs is shown in Figure 9 on page 16.
+
-
LHD detection
zone
+
-
Junction box
(Optional)
Inerposing cable
(Optional)
+
-
Alarmline II Digital
Sensor Cable
Junction box
