Chrysler Air Raid Siren Maintenance Manual - Model 20A-480

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ALL CLEAR SIGNAL

The "All Clear" Signal consists of Three, One minute steady tone Signals, with Two minute silence between Signals.

CAUTION

Maintain a constant pressure on the Signal Switch, any momentary release would permit the Siren Engine speed to vary, any variation in the speed would likewise affect the sound tone and might cause confusion between the "All Clear" and the "Warning" Signals.

Remote Control Operation

TO GIVE THE "ALL CLEAR" SIGNAL:

1. Press the Signal Switch "ON" for approximately Four seconds and release.

2. When the Signal Light GLOWS, it will indicate the Siren Engine is running and ready for operation.

3. To give the "All Clear" Signal, Press the Signal Switch "ON" maintain pressure for One minute, release to "OFF" for Two minutes, press "ON" for One minute, release for Two minutes, press "ON" for One minute, release.

4. Upon completion of the "ALL Clear" Signal and release of Signal Switch, the Signal Light will continue to GLOW for a short time delay period and then go out, indicating the Siren Engine has automatically stopped running.

Local Control Operation

TO GIVE THE "ALL CLEAR" SIGNAL:

1. Move Selector Switch from the REMOTE to MANUAL position.

2. Pull the Ignition Switch to "ON" position to start the Siren Engine.

3. To give the "All Clear" Signal, Press the Throttle Switch "ON" maintain pressure for One minute, release to "OFF" for Two minutes, press "ON" for One minute, release for Two minutes, press "ON" for One minute, release.

4. Upon completion of the "All Clear" Signal, allow approximately Two minutes time to elapse before moving Ignition Switch to "OFF" position.

5. Push Ignition Switch to the "OFF" position to stop the Siren Engine.

6. Move Selector Switch from MANUAL to REMOTE position.

THE TIME PERIOD OF THE "WARNING" AND THE "ALL CLEAR" SIGNALS IS ESTABLISHED BY THE FEDERAL CIVIL DEFENSE ADMINISTRATION; THE PROCEDURE FOR PRODUCING THE SIGNAL HAS BEEN ACCEPTED BY VARIOUS MUNICIPALITIES AND IS AT THIS TIME CONSIDERED UNIVERSAL THROUGHOUT THE COUNTRY, IT IS HOWEVER, SUBJECT TO GOVERNMENT REGULATIONS AND CHANGES.

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