"REMOTE" refers to a Signal Switch, 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 Control Box requires:

1. SIGNAL SWITCH. A normal open Push button type.  The first Four second pressure, closing contacts, will actuate Relays that will start the Siren Engine.  After the Engine has started, any further pressure, closing contacts, will actuate other Relays that will open Engine Throttle, immediately increasing the Siren Engine speed to 4600 R.P.M.  Release of pressure and the Siren Engine will return to Idle speed of 650 R.P.M.

2. SIGNAL LIGHT. When GLOWING, indicates to the Operator, that Siren is running, that Engine has normal oil pressure, water temperature and is ready for operation.

After starting the Siren Engine and Signal Light GLOWS, or upon completion of a "Warning" or "All Clear" Signal.  If no further pressure is applied to the Signal switch, a Time Relay will allow the Siren Engine to continue to Idle for a short time delay period, then automatically stop the Engine.  The Signal Light will go out, indicating to the Operator, The Siren Engine is Secured until further operation is desired.

Other Sirens may be connected in parallel and operated from the same Remote Signal switch, 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 service 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 the Siren Engine; Push will stop the Siren Engine.

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

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

5. IGNITION RELAY. Energized by the Remote Signal switch, and in turn energizes other Relays to start and 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 the Ignition switch in Instrument panel "ON" starts Engine, "OFF" stops Engine (Figure 2). Throttle button on Instrument panel is mechanically linked to Carburetor Throttle and can be adjusted for desired Engine speed. Starter button on Instrument panel is inoperative on Sirens having Remote Controlled circuits. The 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. After the Ignition switch is turned "OFF" to stop the Engine, A Three minute time period must elapse to allow Thermal Time Delay Relay to cool, before moving Selector switch to Remote position.  When service operations are completed, Clutch must be re-engaged and the Selector switch in Local Station Control Box, moved from MANUAL to REMOTE position.

Figure 2.

 

Figure 3.

[ Enlarge Siren Schematic Wiring Diagram ]