Whelen WPA112 - Manual (Page 2)

Page 2
INTRODUCTION...
This manual outlines the procedures necessary for the
installation of the WPA
TM Series Waterproof Amplifier. This
includes the 100 Watt models (WPA112, WPA124) and 58 Watt
models (WPA512 and WPA524).
Mounting the WPA Series Waterproof
Siren Amplifier:
Caution: If the amplifier is mounted vertically, it must
be oriented so that the connector end of the amplifier
is facing downward!
1. Locate a suitable mounting location for the WPA. Do not
mount this product in any location where it may be exposed
to extreme temperatures.
2. Be sure that the remote amplifier fits properly and does not
interfere with any vehicle components.
3. Position the remote amplifier on the proposed mounting
location. Using an awl or other suitable tool, scribe the
mounting surface where the mounting holes are to be
drilled.
Caution: As mounting the WPA will require drilling, it
is absolutely necessary to make sure that no other
vehicle components could be damaged by the
drilling process. If damage is likely, select a different
mounting location.
4. Carefully drill the mounting holes in the areas scribed in
step 3. The diameter of these holes will be determined by
the size of the mounting hardware and the thickness of the
mounting surface.
5. Using the supplied #10 x 3/4” sheet metal screws and #10
external tooth lock washers, secure the remote amplifier to
the mounting location.
Wiring the WPA Series Waterproof
Amplifier:
Connecting To Power:
1. Following the factory wiring harness, extend the RED and
BLACK wires to the battery.
WARNING! All customer supplied wires that connect to the
positive terminal of the battery must be sized to supply at
least 125% of the maximum operating current and FUSED
at the battery to carry that load. DO NOT USE CIRCUIT
BREAKERS WITH THIS PRODUCT!
2. Connect the RED wire to one end of a user supplied fuse
block. Do not connect this unit to the battery yet!
3. Connect the BLACK wire directly to the vehicle’s chassis
ground (typically adjacent to the battery).
Connecting To Your Speaker:
1. Route the ORANGE and BROWN wires towards your
speaker.
2. Connect the ORANGE wire to the POSITIVE (+) terminal
on the speaker.
3. Connect the BROWN wire to the NEGATIVE (-) terminal on
the speaker.
Note: The two (2) BLUE wires are used to connect
your two-way radio’s external speaker to the
WPA for radio rebroadcast. This is an
optional connection and does not effect the
other operations of the WPA.
Wiring The WPA Siren Amplifier Radio
Rebroadcast Wires (BLUE):
1. Locate the two wires that connect the external speaker to
the vehicle’s two-way radio.
2. Cut one of these wires and splice one of the BLUE wires
into this circuit.
3. Cut the remaining speaker wire and splice the remaining
BLUE wire into this circuit.
Note: Radio rebroadcast will NOT work with
amplified remote speakers! If your remote
speaker is amplified (i.e.: contains a power
amp circuit in the speaker assembly), do not
enable the radio rebroadcast feature.
Connecting To Your Horn Relay (Optional):
Note: This option can only be enabled when using
customer supplied switches.
1. Locate your vehicle’s horn relay. Now locate the wire that
connects the vehicle horn to the horn relay output and cut
this wire.
2. Extend each end of the cut wire (using a minimum 16
gauge wire) to a user supplied SPDT (single pole/double
throw) horn transfer switch.
3. Connect the wire coming from the horn relay output to the
switch “wiper” as shown in Figure 1.
4. Connect the wire coming from the horn to one side of the
switch as shown in Figure 1.
5. Connect the WHITE/GREEN wire to the other side of the
switch as shown in Figure 1.