Chrysler Air Raid Siren Maintenance Manual - Model 20A-481

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ALL CLEAR SIGNAL

The All Clear Signal consists of Three (3), One (1) minute steady tone Signals, with Two (2) minute silence between Signals.

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

Remote Control Operation

TO GIVE THE "ALL CLEAR" SIGNAL:

1. Move Ignition Switch to "ON" position.

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

3. To give "All Clear" Signal, press 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 "All Clear" Signal allow approximately Two minutes time to elapse before moving Ignition Switch to "OFF" position.

5. Move Ignition Switch to "OFF" position to stop Siren Engine.

Local Control Operation

TO GIVE "ALL CLEAR" SIGNAL:

1. Move Selector Switch from REMOTE to MANUAL position.

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

3. To give "All Clear" Signal, press 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 "All Clear" Signal, allow approximately Two minutes time to elapse before moving Ignition Switch to "OFF" position.

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

6. Move Selector Switch from MANUAL to REMOTE position.

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