"REMOTE" refers to Control Switches, Signal Light and Circuits in a Control box, located at a Central Headquarters Station.

"LOCAL" refers to Control Switches, Relays and Circuits in a Control Box, installed near to, but not on the Siren.

"MANUAL" refers to Control Elements installed on the rotating Siren Assembly.

REMOTE CONTROL

The Central Headquarters Station Remote Control Box requires:

1. IGNITION SWITCH. An "ON" and "OFF" toggle type. When Ignition Switch is moved to "ON" position, it will actuate Relays that will turn on the Ignition and Start the Engine. Returning Ignition switch to "OFF" position, Signal Light will go out, indicating to the Operator, Siren Engine is secured until further operation is desired.

2. SIGNAL LIGHT. When the Engine has started, the Signal Light will glow indicating to the Operator, that Siren Engine is running, has normal oil pressure, water temperature, and is ready for operation.

3. THROTTLE SWITCH. A normally open push button type. Finger tip pressure will actuate Relays to open Engine Throttle, immediately increasing Siren speed to 4600 R.P.M. Release of finger pressure on switch and Siren will return to Idle speed of 650 R.P.M.

Other Sirens may be connected in parallel and operated from the same Remote switches, or they may be independently operated by individual switches which are ganged mechanically or electrically through Relays, so that the Sirens may be operated separately or together as desired. Failure of any one Engine to operate will in no way effect the others.

LOCAL CONTROL

1. SELECTOR SWITCH. This is a double-pole, double-throw switch which enables the Operator to select REMOTE or MANUAL operation. This permits signaling or testing of the Siren from a position close to the Engine and eliminates the possibility of inadvertent damage to the Service Man or equipment by the operation of the Siren from the Remote Control Center while the Siren is being serviced.

2. IGNITION SWITCH. A Push-Pull type. Pull will actuate Relays and start engine; Push will stop Engine.

3. THROTTLE SWITCH. A normally open Push button type. Finger Tip pressure will actuate Relays to open Engine Throttle, immediately increasing Siren speed to 4600 R.P.M. Release of Finger pressure on switch and Siren will return to Idle speed of 650 R.P.M.

4. SIGNAL RELAY. Energized by the Siren Engine oil pressure-temperature switch, completes circuit to GLOW Signal Light at Central Headquarters when Engine is running and ready for Signaling.

5. IGNITION RELAY. Energized by the Remote Ignition switch and in turn energizes IGNITION RELAY "F" to start and idle engine.

6. THROTTLE RELAY. Energized by the Remote Throttle switch and in turn energizes THROTTLE RELAY "G" to Cycle Siren.

MANUAL CONTROL

The use of the Manual Control switches on the Siren assembly is primarily for service and maintenance operations. Before any operations are started, move Selector switch, in Local Station Control Box, from REMOTE to MANUAL position. Disengage Clutch to prevent assembly turning and Siren sound. Turning Ignition switch in Instrument panel "ON" starts Engine, "OFF" stops Engine (Figure 2). Throttle button on Instrument panel is mechanically linked to Throttle and can be adjusted for desired Engine speed. Starter button on Instrument panel is inoperative on Sirens having Remote Controlled circuits. Penn switch button at rear of Engine housing has three positions, "Start", "Run" and "OFF". It is completely automatic and does not require manual reset. When service operations are completed, Clutch must be re-engaged and Selector switch in Local Station Control Box moved to REMOTE position.

[ Enlarge Siren Schematic Wiring Diagram ]