To complete the electrical connections, proceed as follows:
CAUTION
Do NOT loosen or remove the clamp ring or any of the six screws on the front of the horn housing.
Loosening or removing any of the screws may disturb the factory adjustment of the horn mechanism
and cause a horn malfunction. In addition, the horn mechanism may be damaged.
1. Remove the set screw from the collar using a 1/8" hex wrench.
2. Using a large screwdriver and mallet, or similar tools, rotate the collar counterclockwise as
shown in figure 1. Tap the screwdriver until the collar can be rotated by hand. Remove the
collar from the housing.
3. Lift the horn mechanism from the housing.
4. Use a method approved by local building codes and connect fixture wires to supply wires. If
required by local building codes, provisions for attaching an earth ground are included.
5. Replace the horn mechanism in the housing.
6. Replace the collar on the housing and hand-tighten.
7. Tighten the collar using a screwdriver and mallet. Secure the collar with the set screw.
III. MAINTENANCE.
WARNING
To prevent ignition of hazardous atmospheres, disconnect the unit from the supply circuit
before opening. Keep tightly closed when in operation.
SAFETY MESSAGE TO MAINTENANCE PERSONNEL
Listed below are some important safety instructions and precautions you should follow:
• Read and understand all instructions before operating this system.
• Any maintenance to the horn system must be done with the power turned off.
• Any maintenance to the horn system must be performed by a trained electrician in accordance
with NEC Guidelines and local codes.
• Never alter the unit in any manner. Safety in hazardous locations may be endangered if additional
openings or other alterations are made in units specifically designed for use in these locations.
• The nameplate, which may contain cautionary or other information of importance to maintenance
personnel, should not be obscured if exterior of housings used in hazardous locations are painted.
• The only electrical component to be replaced by the customer is the horn mechanism.
A.Volume Adjustment.
Explosion-proof horns are shipped with the volume set for maximum sound output. However the
sound level from the horn can be reduced to any desired level.
NOTE
To prevent the horn from producing a rough or “rasping” tone and repeated readjustment of the
adjusting screw, do NOT turn the screw counterclockwise from the factory setting.
To adjust the volume, proceed as follows:
1. Remove the horn mechanism from the housing as described in paragraph II.C.1., 2., and 3.
2. Using a 1/4" wrench, turn the adjusting screw clockwise as shown in figure 2, until the
desired volume is reached.
3. Replace the horn mechanism in the housing as described in paragraph II.C.5., 6., and 7.
B.Lubrication.
Threaded covers should be well lubricated with an anti-seize compound. If corrosive products
have accumulated on explosion-proof joints and cannot readily be removed with solvents, the
parts should be discarded and replaced.
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