Code 3 MasterCom B Series - Manual (Page 5)

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The 3890 series siren may be mounted above the dash, below the dash, on a tunnel or in a rack with
the mounting bracket (bail) and the hardware supplied (see Fig. 2). Ease of operation and
convenience to the operator should be the prime consideration when mounting the siren and
controls.
movement away from the seat back or loss of eye contact with the
The bail is mounted to the siren chassis by means of the "T" slot in the side of the unit and the 1/4-20
carriage bolts, washers, and nuts supplied. See Figure 2 for assembly and positioning details. Note
that once the unit is installed, removal involves only loosening, not removing, the acorn nuts. Use of
1/4 - 20 HEX head bolts can damage slots and prevent easy removal of the unit.
NOTE: Set-ups and adjustments will be made in subsequent steps, depending upon the model and
options purchased, that may require access to the rear area of the unit. Plan the installation and
wiring accordingly.
Amplifier Connections
Siren Amplifier Connector - As a standard feature, the Siren and Auxiliary sections ('L4 & 'L6
models) of your unit come equipped with a combination plug-in terminal block/connector. To
terminate the wires, strip approximately 1/4" of insulation from the end of each wire and insert it in
the appropriate hole in the terminal block. Recommend using a screwdriver with a 1/8" wide blade
with a 6" shaft such as an Xcelite(C) R186 or equivalent rather than a 4 1/2" adjustment screwdriver
to ensure proper torque on the screws. Tighten the set-screw and proceed to the next connection.
Should you ever have to remove the unit, pull the terminal block straight out. It will unplug from
the unit, leaving the wiring in place.
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 connections. Do not use insulation displacement
connectors (e.g. 3M
® ) Scotchlock type connectors). Route wiring using grommets 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 similiar 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 connections and
splices to protect these points from corrosion and loss of conductivity. Ground
(Earth)terminations should only be made to substantial chassis components, preferably
directly to the vehicle battery. The user should install a circuit breaker sized to
approximately 125% of the maximum Amp capacity in the supply line to protect against
short circuits. For example, a 30 Amp circuit breaker 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!
!
Installation & Mounting