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INSTALLATION INSTRUCTIONS
FOR 3H, 4H, 4M, and 6H Air Horns
Address all communications and shipments to:
FEDERAL SIGNAL CORPORATION
Electrical Products Division
Service Department
2645 Federal Signal Drive
University Park, IL 60466-3195
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INSTALLATION INSTRUCTIONS
FOR
3H, 4H, 4M, AND 6H AIR HORNS
SAFETY MESSAGE TO INSTALLERS
People’s lives depend on your safe installation of our products. It is important to
follow all instructions shipped with the products. This device is to be installed by
qualified personnel who are trained in pipefitting and electrical wiring, and are
familiar with national as well as local codes.
The selection of the mounting location for the device, its controls and routing of
the pipe is to be accomplished under the direction of the facilities engineer and the
safety engineer. In addition, listed below are some other important safety instructions
and precautions you should follow:
• Read and understand all instructions before installing or operating this
equipment.
• Optimum sound distribution will be severely reduced if any objects are
in front of the horn. You should ensure that the front of the horn is clear
of any obstructions.
• All effective warning horns produce loud sounds which may cause, in
certain situations, permanent hearing loss. You should take appropriate
precautions such as wearing hearing protection when testing the horn.
• After installation, ensure that all bolts and threaded joints have been
tightened.
• Establish a procedure to routinely check the sound system for proper
activation and operation.
• Provide a copy of these instructions to the safety Engineer, operator(s),
and maintenance personnel.
• File these instructions in a safe place and refer to them when maintaining and/or reinstalling the device.
• Failure to follow all safety precautions and instructions may result in
property damage, serious injury, or death to you or others.
A. GENERAL.
These air horns utilize stainless steel diaphragms and corrosion resistant castings
finished with a gray polyester coating. They are capable of being operated on air
pressure of 20 to 150 p.s.i.g., but are tuned for optimum audibility at 80 to 90 p.s.i.g.
The Model 3H horn is tuned to a frequency of 750Hz. It has a female 3/8 I.P.S
threaded opening for connection to the compressed air system, and is light enough to be
supported by the pipe to which it is connected.
The Model 4H horn is tuned to 450Hz and the Model 4M horn is tuned to 340Hz.
Both horns have a female 1/2 I.P.S. threaded opening for connection to the compressed
air system, and are provided with a mounting ear on each side of the casting that
includes a hole for 5/16 inch bolts.
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The Model 6H horn is tuned to a frequency of 295Hz. It has a female 3/4 I.P.S.
threaded opening for connection to the compressed air system and is provided with a
mounting ear on top of the casting that includes two mounting holes for 1/2 inch bolts.
It also contains a mounting flange around the pipe opening with four mounting holes
for 1/2 inch bolts.
B. INSTALLATION.
1. Determine the location of the horn and air valve, and layout the airline to
them from the air source. For optimum performance the air line should be as short
and as straight as possible. Angles and bends should be avoided as much as possible,
but where unavoidable, it is recommended that long sweep elbows be used to maximize
air flow to the horn.
NOTE
The valve to actuate the horn should be located as close to the horn as
possible. The farther it is located from the horn the longer it will take to
obtain full volume when activated and the longer it will take to stop sounding
when deactivated.
2. Before attaching the horn to the air line, blow out the air line to remove any
debris that may have accumulated during assembly. Failure to do so may cause the
debris to become lodged in the air valve or between the horn’s diaphragm and body
which will restrict movement of the diaphragm and significantly affect horn performance.
3. It is recommended that a pipe union be used when connecting the horn and
air valve to the air line. This will allow for easier removal of the horn and air valve
should service be required.
C. OPERATION.
WARNING
These horns produce very loud sounds. Appropriate hearing protection
should be worn while verifying horn operation.
Operate the air valve and verify that the horn sounds. Also verify that the sound
is smooth with no distortion. Release the air valve.
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SAFETY MESSAGE TO MAINTENANCE PERSONNEL
• Read and understand all instructions before performing any maintenance to this unit.
• Optimum sound distribution will be reduced if the horn becomes clogged
with a foreign substance. Periodic checks should be performed to ensure
foreign substances are not packed into horn.
• Any maintenance must be performed by qualified personnel trained in
pipe fitting and electrical wiring in accordance with national and local codes.
• Never alter the unit in any manner. Safety in hazardous locations may
be endangered if additional openings, or alterations are made to the unit in
these locations.
Failure to follow all safety precautions and instructions may result in property
damage, serious injury, or death to you or others.
D. REPLACEMENT PARTS.
Description Part Number
Retaining Ring, 3H K8271A009
Retaining Ring, 4H K8271A011
Retaining Ring, 4M K8271A034
Retaining Ring, 6H K8271C023
Diaphragm, 3H K8271A020
Diaphragm, 4H K8271A013
Diaphragm, 4M K8271A072
Diaphragm, 6H K8271A077
Locking Screw, 3H, 4H, 4M K7000A070-16
Locking Screw, 6H K7002A046-12
Jam Nut, 3H, 4H, 4M K7059A016
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E. SPECIFICATIONS.
A
A
A
3" HORNS
4" HORNS
6" HORNS
290A4401
C
C
C
B
B
B
C
Model Dimensions (in) Weight Air Valve to
A B C (lbs) Be Used
3H 4-7/8 4-3/4 3-7/8 3.5 EVS
4H 7-7/8 5-5/8 5 5 EVM
4M 11-1/4 5-9/16 5 7.5 EVM
6H 12-3/8 9-1/2 2-3/16 21 EVL
Model Pipe Size Air Consumption Frequency dBA@
(in.) (cubic ft/sec) (Hz) 10 ft.
3H 3/8 0.2 750 112
4H 1/2 0.25 450 117
4M 1/2 0.25 340 117
6H 3/4 0.45 295 122
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