SECTION XI - GENERAL INFORMATION
AMPLIFIER SPECIFICATIONS
Standby Current Drain
Current Drain During PA
Maximum siren current Drain @ 200 Watts
Siren Output (Switch Adjustable)
WAIL and YELP Frequencies
HI-LO & HETRO Frequencies
Intrusion Alarm Frequency
Air Horn Mid-Frequency
WAIL Repetition Rate
YELP Repetition Rate
HI-LO Repetition Rate
HETRO Repetition Rate
Audio Output with One Speaker
Audio Distortion
Reversed Input Polarity
Input Voltage Over 16Vdc
Speaker Short Circuit
Amplifier Restoration After Shorting
Zero
800 Mils.
15A.
58 to 200 Watts
500 to 1600 Hz.
625 & 575 Hz.
1600 Hz.
1050 Hz.
11 Per Minute
240 Per Minute
60 Per Minute
900 Per Minute
25 or 50 Watts
Less Than 10%
Protected
Protected
Protected
Automatic
DETERMINING WIRE SIZE
1. It is essential to proper siren and warning light
operation to use wires large enough to carry the
load (amperes). Wires too small will create siren
malfunctions and reduce warning light brilliance
and can easily cause vehicle fires.
2.
Primary Wire Size
- Refers to model number and
corresponding instructions in this Manual.
3.
Warning Light & Accessory Sizes
- Determine
wire size by adding current drain (amperes) of all
lights or accessories that will be connected to any
one control wire from Unitrol.
4.
Warning Light Current Drain
- Lamps used in
warning lights are frequently rated in terms of “watts”
rather than “amperes”. Simply divide watts by vehicle
voltage (13 volts nominal). The result will be amperes.
5.
Motors & Relays
- Most motors used in warning
light bars draw 1 ampere or less. Most relays draw 3
amperes or less.
6. Keep in mind that wire diameter increases as wire
gauge number decreases.
POWER JACK PLUG
1. A radar, cord light or any device drawing less than 18
amperes can be operated from the power jack in Models
280K and 480K
. The jack accepts a two-contact “telephone”
plug. Use 18ga. (minimum) insulated wire. Observe polarity.
TAPE JACK PLUG
1. Recorded messages and music can be played over the PA
system with Models
280K and 480K
. A cord plugs into the
recorder’s headphone jack at one end into the tape jack at the
other end.
2. Only battery-operated recorders can be used. The Unitrol
power jack cannot be used to power the recorder.
3. Audio connections may be obtained by using audio plugs
with 20-24 gauge wire.
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INDICATOR LIGHT REPLACEMENT
1. Indicator lights in models 280K, 480K and
Switchpak are designed to be replaced as a
complete unit (the light bulb is molded into the
indicator light body). The body is secured in
place by barrel pressure. No hardware is used
or required.
2. To replace, proceed as follows:
a) Pull control unit chassis forward and
de-solder wire from the two lamp terminals.
b) Push indicator light from terminal-end
until body passes through faceplate.
c) Reverse process to install replacement
light using care not to overheat lamp
terminals during soldering.
NOTE
: Hi - Lo is deleted in the state of CA. The tone
is not recognized as a primary emergency warning
tone as per Title 13.
