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3.2 Mounting
Select the mounting location
in
accordance
with
the
guidelines in Section 3.1.
Make sure that the expected
intruder's path will cross the
detector's coverage pattern.
DUO 240 units can be
mounted at the maximum
height of 4.5 m (15 ft).
Proceed as follows:
A. Hold the base with one
hand as shown in Fig. 2.
Twist the cover counter-
clockwise with the other
hand
until
it
stops.
Separate the cover from
the base, and put it in a safe place, to avoid accidental
damage.
B. Press the base against the ceiling in the selected location.
Mark the two points for drilling through the mounting holes
(see Fig. 3).
Note: The mounting holes are accessible without removing
the printed circuit board from the base. Do not drill with the
detector held in place, to avoid contaminating the unit with
dust and drilled fragments.
3.3 Wiring
Connect wires to the terminal block in the following order (Fig. 4):
Terminal: TAMP (tamper switch)
Connect to: A normally closed 24-hour tamper zone of the
control panel.
Details: Once the cover is removed, the tamper switch opens.
Terminal: NC (alarm relay)
Connect to: Normally closed burglar protection zones of the
control panel.
Details: Upon alarm or power failure, the output relay's normally
closed contacts open.
Terminal: TRB (trouble output)
Connect to: 24-hour trouble zone, parallel to an E.O.L. resistor
(see Figure 4).
Details: The TRB open collector output will be grounded upon
detector malfunction, causing disturbance in the trouble zone of
the associated alarm system.
Alternative: A buzzer or an interface relay (100 mA max.) may
be connected across the TRB output and the 12 V (+) terminals.
In UL installations, the buzzer, control panel or relay to which
the trouble output is connected must be UL-listed.
Terminals: 12 V(+) and (–)
Connect to: A power source within the range of 9 VDC to 16
VDC. Take care not to reverse the polarity.
Details: It is advisable to connect the power source only after all
other connections have been completed and rechecked.
Disconnect the AC mains from the alarm control panel and verify
that the voltage supplied to the detector is above 9 Volts with the
backup battery as the only power source.
3.4 The Power-up Process
After connecting the (+) and (–) terminals to the power source,
the DUO 240 starts a 60-second warm-up period, indicated by
alternate
flashing
of
2
Figure 2. Separating the Cover
from the Base
the
green
and
red
C. Put the base aside, drill the two holes in the ceiling and insert
masonry anchors if necessary.
D. Punch out at least one wiring knockout (preferably the one
close to the terminal block).
E. Align the unit (including printed circuit board) with the mounting
holes and fasten it firmly to the ceiling with two screws.
Figure 3. Component Layout
IMPORTANT: To comply with CE safety requirements, connect to
CE-approved control panels with current-limited DC output.
Notes:
Intended to be connected to a compatible listed burglar alarm
control unit or power supply with an output voltage range within
9-16vdc and is provided with a minimum of 4 hrs. standby power.
Use RTV to seal the base opening(s) to prevent insects from
entering the detector.
12V
12 VDC
SOURCE
Caution! If the alternate flashing of the LEDs does not stop
within 60 seconds, a failure has been detected by the self-test
circuitry and the TRB output is activated
LEDs.
ALARM TAMPER
47 Ω
N.C.
TAMP. TRB
BURGLAR
ZONE
24-HOUR
TAMPER
ZONE
CONTROL PANEL
Figure 4. Terminal Block Wiring
12 V
47 K Ω
TROUBLE
24-HOUR
TROUBLE
ZONE
DE1826
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