Dual Zone Digital Location Control Unit Installation and Operation Manual 10
Protection of one risk area as one detection zone with two different
temperature sensor cables providing a pre-alarm and alarm system
Figure 5: Protection of one risk area as one detection zone with two different temperature
sensor cables providing a pre-alarm and alarm system
As the control unit can monitor two zones of sensor cable, it can cover a single
risk area with two sensor cables of different alarm temperatures, effectively
providing a two-stages alarm system.
Each zone has separate status outputs allowing the fire alarm control panel to
determine which temperature cable has activated the alarm. Through the fire
alarm control panel, different cause and effects can be programmed for each
alarm activated by the control unit.
Caution: As the system uses one control unit, the total combined area coverage
of both Digital LHD zones cannot exceed the maximum detection zone size as
defined by local standards (refer to your local standards).
Interlock mode
This mode configures the control unit as two LHD zones providing coincidence
detection (that is, both zones of sensor cable must be in an alarm state in order
to activate an alarm on the control unit, which is then signaled to the main fire
alarm system). Interlock mode should be used in applications where a failsafe
alarm is required.
The sensor cables connected to zone 1 and zone 2 of the control unit must have
the same alarm temperature and must be installed in the same risk area, running
parallel to each other.
Note: In interlock mode only one set of status outputs function, and these are the
ones associated with LHD zone 1.
PSU
control panel
zone 1
zone 2
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