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ZONESENSE DH4
OPERATORS MANUAL
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ZoneSense – DH4 Description
The ZoneSense DH4 is a four (4) zone conventional Fire Alarm Control Panel (FACP) with a front
panel layout that offers a user friendly interface, clear visual indications and tactile-feedback for
controls.
The design of the ZoneSense DH4 focuses on applications for local alarm FACP’s – i.e. a
non-brigade calling system but with a host of features.
Key features of the ZoneSense DH4 FACP include:
Dual Door Holder Outputs – two failsafe 24VDC outputs for fire door operation. The outputs
being de-activated and doors released if an alarm condition is present or they are manually
released at the front panel Mains Only Mode or optional backup battery operation – factory
set to operate on mains only. Changing the setting will permit monitoring of optional batteries
Low quiescent current – of particular benefit if the battery option is used
Walk Test Facility – allows a single person to perform a system test
Class Change Input – allows the alarm output to be controlled by an external programmable
timer
Alert Input – when an alert input is active the alarm output will pulse on & off in 1 sec
intervals
Easy to use – the panel is simple to operate, install and commission therefore reducing
costs
Each detection circuit accommodates up to 40 Conventional Fire Detectors
The main board:
Accommodates the visual indications and controls
Two (2) volt-free changeover contacts (Fire & Fault)
Termination for detection zones
Two (2) monitored alarms outputs – open collector
Two (2) unmonitored door holder outputs
Two (2) non-latching inputs (‘class change’ and ‘alert’)
Auxiliary 24VDC output
On board power supply
CAB2797
TO BATTERIES
CHASIS
EARTH
TERMINAL
CN4
CN2
BRD22MCB PCB0758
MAIN CONTROL BOARD
(REAR VIEW)
MAINS
TRANS-
FORMER
FRONT DOOR (REMOVED)
BATTERY 1 (B1)
BATTERY 2 (B2)
TO REMOVE
THE DOOR
UNPLUG CABLES
AND PUSH
UPWARDS
HERE
DOOR
HINGES
X4
ABS BRIDGE
32VAC
CN3
FUSE
BLOCK
0.5A
M205
BATTERY CONNECTION
WHITE SERIES
WIRE -VE (B1)
TO +VE (B2)
RED TO
+VE (B1)
BLACK TO
-VE (B2)
Figure 1: Typical Example of a ZoneSense – DH4 Layout
