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It is the responsibility
of the Operator assigned to the Chrysler Air-Raid Siren to make sure that it
is in perfect condition to operate at full efficiency at a moments
notice. In order to insure instant operation in temperatures ranging as
low as twenty-five (25) degrees below zero F. it is advisable to
maintain the Engine water and Battery temperatures higher than the
surrounding air temperature.
To accomplish this, the Engine is equipped with Two
(2) Four Hundred (400) watt Engine water heaters, A Two Hundred Fifty
(250) watt Battery heater that is thermostatically controlled to shut
off when Battery temperature is above sixty (60) degrees F. and a
Battery trickle charger to maintain Battery in a fully charged state.
The Battery charger will probably have to be operated
continuously and will supply a charge rate of about one half (1/2)
ampere. The Engine heaters and Battery heater will be required for only
very cold temperatures, although continuous operation of the Engine
water heaters when the temperature is below sixty (60) degrees F. is
The following operations should be performed by the
Operator on his Weekly Inspection of the Siren.
1. Move Local Station Selector switch from REMOTE
position to MANUAL position.
2. Disengage Clutch by pulling lever to full rear
position (toward compressor).
3. Check quantity of gasoline in fuel tank
(gasoline tank should be kept full at all times).
4. Check water level in Radiator, do not fill above
one inch below lower end of filter neck (in cold weather test
5. Check Oil in crankcase. Be sure it is up to full
mark on oil level indicator.
6. Check Battery (visual). Make certain Battery top
and terminals are free of dirt and corrosion.
7. Test specific gravity of the Battery electrolyte
with a hydrometer having a temperature correction scale, cells should
read even within ten (.010) points and have a specific gravity reading
of twelve-fifty (1.250) or above after temperature correction. After
specific gravity test is made, add pure water if necessary, so that
plates are covered about three-eights (3/8) inches.
8. Remove any loose material near Compressor that
may be picked up by inrush of air, to avoid any possible damage to
9. Inspect Air Horns for any obstructions.
10. Inspect Fan, Generator, Governor and Power
Take-Off belts for tightness, and adjust if necessary, so there is
one-half (1/2) inch of slack when pressure is applied between pulleys.
11. Inspect Reduction gear to Turntable drive chain
for tightness, adjust if necessary by moving Reduction gear housing
and hold down bolts in the slotted holes, in the frame.
The Starter switch on Instrument panel is
inoperative on Sirens having Remote Control Circuit. Engine is started
by Ignition switch. Start Engine and run it at Idling speed, not to
exceed 1000 R.P.M. until normal operating temperature of approximately
160 degrees F. is reached as indicated by the temperature gauge
located in the Instrument group.
12. Move Ignition switch on Instrument panel to
13. Adjust Throttle control button on Instrument
panel until engine speed reaches 1000 R.P.M. as shown by Tachometer in
CAUTION: Do not run engine in excess of 1000 R.P.M.
14. Run Engine until normal operating temperature
of about 160 degrees F. is reached as shown by temperature gauge in
15. Close Throttle control button on Instrument panel to return
Engine to Idle.
16. Move Ignition switch to "OFF" position.
17. Engage clutch by pushing lever to full forward
position (toward engine).
18. Move Local Station Selector switch from MANUAL
position to REMOTE position.
CAUTION: The clutch must be engaged to give
"Warning" Signal. After inspection, always make sure Clutch is
returned to engaged position.
1. EAR PLUGS MUST BE USED FOR PROTECTION BY THE
OPERATOR OR OTHER PERSONS NEAR THE SIREN IF THE SIGNAL IS BEING GIVEN
AT LOCAL STATION.
2. UNDER NO CONDITIONS SHOULD THE OPERATOR OR ANY
OBSERVERS COME IN DIRECT CONTACT WITH THE BLAST FROM THE SIREN HORNS
WHILE THE SIGNAL IS BEING GIVEN.
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