Introduction
The LA-20B External Multi Alarm with 8 amp
light flashing circuit has five alarm input terminals
and connects up to five instruments to provide an
amazing loud 105 dB alarm volume that can be
seen and heard for 1/4 mile or more.
All connections are to screw terminals simplifying
installation and requires only a screwdriver. Four
of the five alarms can be turned off by pressing the
RESET button, one purposely bypasses the RESET
button and must be turned off at the source.
Two different types of inputs are provided. Three
inputs activate the alarm if any one of them go
below 5 VDC. The other two inputs activate the
alarm if one of them goes high (+2 to + 33 VDC).
One of the latter bypasses the RESET button
(cannot be turned OFF at the LA-20B).
If the LA-20B is silenced by pressing the RESET
button, it automatically re-arms itself when all the
inputs are in a clear state.
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Installation
Remove the case front and align the case back onto
any suitable surface. The case is not waterproof
and should be mounted in a dry place. Use the case
back as a drill guide, mark the location of the two
holes with a pencil. Drill two 2mm (3/32 inch)
holes and mount the case back using the screws
provided. To hide the wires, use the rear exit with
the enclosed spare rubber grommet.
Thread two 16 gauge wires through the rubber
grommet on the case front (or rear) and connect to
the terminals marked "+12V" and "GND" in Fig-
ure 1. Connect the alarm inputs using 22 gauge (or
larger) wire. Signals connected to the terminals
marked "L" in Figure 1 will activate the alarm if
they go low (below 5 VDC). Signals connected to
terminals marked "H" in Figure 1 activate the
alarm if they go high (+2 to +33 VDC). The signal
connected to terminal "HB" activates the alarm if
it goes high (+2 to +33 VDC), bypasses the RESET
button and cannot be silenced at the LA-20. See
the chart on page 9 for the correct connection
points
Page 6
for CruzPro instruments.
If desired, connect a 16 guage wire from terminal
"O" to your spreader, anchor, or running light
circuit. When the LA-20B alarm sounds, The "O"
output terminal switches +12VDC to your light
Figure 1 - Connection Diagram
Page 7
CruzPro Instrument Connection Table
The following CruzPro instruments are designed to
connect to the LA-20 as shown below:
Instrument LA-20 Terminal
CC-20 8 Amp Charge Controller L
CC-30 20 Amp Charge Controller L
GD-20 LPG/CO Gas Vapor Alarm H
SA-20 Security System/Alarm HB
EFS-20 Dual Bilge Pump Controller L
EFS-10 Bilge Pump Controller L
BBA-20 Three Bank Battery Monitor L
AC-20 Manual Alternator Controller L
ETM-20 Engine Temperature Monitor L
BWA-20 Bilge Water Alarm L
DT-20 Dual Electronic Timer/Switch H
NC-20 NMEA Combiner H
RH30 Digital RPM Gauge H
OP30 Digital Oil Pressure Gauge H
VAH35 3 Bank Volts/Amps/A-H Monitor H
V30 3 Bank Digital Volts Gauge H
A30 Digital Amps Gauge H
A maximum of six CruzPro instruments can be
connected to one LA-20.
