AMPAC INDUSTRIES LTD
NZ 100 OPERATORS MANUAL
Page 9
Doc No: g0097wo1.doc
Dir No: L:\manuals
Date: 10/5/00
Rev: 1
4.0
CONNECTING DEVICES
4.1 DETECTORS
Devices such as heat detectors or manual call points which are normally closed, open circuiting
for the alarm condition will give a fire signal within one second of operating.
Devices, which increase the current in the detector line such as smoke detectors, may be
operated with “gating” (alarm verification) as per section 3.4 to eliminate false alarms due to
transient conditions. See also section 5 for details on alarm verification settings.
Note:
These detectors must not directly short the line as a short circuit gives a defect signal.
Devices that have closing contact outputs, such as beam detectors, should have a resistor, in the
range of 220ohm to 560ohm installed in series with the contacts.
Each circuit must be terminated with an end of line resistor with a value of 6.8K (2% tolerance or
better, power rating 1/4W)
+
-
Zone
L1 OUT
L2
L1 IN
SMOKE DETECTOR
(eg APOLLO SERIES
60 DETECTOR)
MANUAL
CALL
POINT
EOL
RESISTOR
6.8K
HEAT DETECTOR
OPENING ON
ALARM
THIS DRAWING IS INDICATIVE OF WIRING ONLY.
ANY COMBINATION OF DETECTORS AND MANUAL CALL POINTS
WITHIN SPECIFIED LIMITS IS PERMISSABLE.
560 Ohm
Resistor
BEAM
DETECTOR
CONTACTS
4.2 DETECTOR LIMITATIONS
Most detectors, with the exception of thermostatic heat detectors, draw a small monitoring current
and this limits the number detectors which can be connected to a given zone circuit. The total
quiescent current of all devices on a zone circuit must be less than 1.6mA @ 24V to ensure
correct operation.
Appendix A lists the number of detector types which may be fitted to a zone circuit.
4.3 BELLS AND SOUNDERS
Two bell/sounder circuits are provided, capable of driving a combined load of three (3) Amps.
These lines are monitored using a small current in reverse polarity to normal operation. For this
reason it is necessary to connect the bells via diodes, 1N4004 diodes are recommended, as
shown in Figure 4.2. Also observe bell/sounder polarity.
B
B
EOL
10K RESISTOR
+
-
BELLS
1N4004
DIODES
S
