Code 3 Remote Compact Siren - Manual (Page 6)

6
Output Short Circuit Protection
The 3920 siren is equipped with output short circuit protection. This system uses electronic circuitry (instead
of fuses or circuit breakers) to protect the siren driver and wiring from damage due to short circuits. In the
event of a short circuit on the siren output lines, the siren senses the excessive current draw and shuts down
the siren output. Once the short has been removed, the siren will return to normal operation.
Specifications
Input Voltage: 10 to 16 VDC, negative ground (earth).
(Note: Operation above 15 VDC for an extended period of time may result in speaker damage.)
Operating Current: One 100 watt speaker - 8 Amps
Idle Current: 35 ma.
Larger wires and tight connections will provide longer service life for components. For high
current wires it is highly recommended that terminal blocks or soldered connections be used
with shrink tubing to protect the connection. Do not use insulation displacement connections
(e.g. 3M Scotchlock type connections). Route wiring using gromments and sealant when
passing through compartment walls. Minimize the number of splices to reduce voltage drop.
High ambient temperatures (e.g. underhood) will significantly reduce the current carrying
capacity of wires, fuses, and circuit breakers. Use "SXL" type wire in engine compartment. All
wiring should conform to the minimum wire size and other recommendations of the
manufacturer and be protected from moving parts and hot surfaces. Looms, grommets, cable
ties, and similar installation hardware should be used to anchor and protect all wiring.
Fuses or circuit breakers should be located as close to the power takeoff points as possible
and properly sized to protect the wiring and devices.
Particular attention should be paid to the location and method of making electrical connection
and splices to protect these points from corrosion and loss of conductivity.
Ground terminations should only be made to substantial chassis components, preferably
directly to the vehicle battery.
The user should install a fuse sized to approximately 125% of the maximum Amp capacityin
the supply line to protect against short circuits. For example, a 30 Amp fuse should
carry a maximum of 24 Amps. DO NOT USE 1/4" DIAMETER GLASS FUSES AS THEY ARE
NOT SUITABLE FOR CONTINUOUS DUTY IN SIZES ABOVE 15 AMPS. Circuit
breakers are very sensitive to high temperatures and will "false trip" when mounted in hot
environments or operated close to their capacity.
WARNING!
!
The 3920 siren is remote controlled via the -REMOTE (W7) terminal. The terminal marked +REMOTE (W6)
is not used.
The terminal marked - REMOTE (W7) requires a momentary ground (earth) signal to cause the siren to
activate or change tones.
Install the siren using the SCROLL switch provided on the siren control panel as shown in Figures 1 & 2. DO
NOT CONNECT ANY WIRE TO THE +REMOTE (W6) INPUT TERMINAL.
*The -REMOTE (W7) input is compatible with most ground switched vehicle Horn Ring switches and may,
optionally, be connected as shown in Fig 2. This allows the siren to be operated by depressing the vehicle's
horn switch. A quick, sharp tap on the horn will turn the siren on. Additional taps will scroll the siren to the
next tone. Depressing the horn for a longer period will produce "Air Horn". When using the vehicle's horn
switch to control the siren it is recommended that the vehicle's horn switch be routed through a transfer relay
(not included). This will allow the normal operation of the vehicle horn to be interrupted while the siren is in
operation.