User's Manual

Component Descriptions
September 2013 2-68 P/N 81-CO2MAN-001
Figure 2-73. Pneumatic Discharge Delay with Manual Control Head
2-8.4 Pressure Operated Siren
The pressure operated sirens provide a mechanical means to generate an audible alarm. The
flow of carbon dioxide or nitrogen into the siren spins a rotor and creates a high pitch and high
decibel sound. The audible alarm warns personnel of an impending CO2 discharge and the need
to immediately evacuate the protected area prior to the discharge. In order to provide a pre-
discharge warning, the siren supply line shall be installed upstream of the discharge delay.
9/16
3-9/16 in.
(90 mm)
DIA.
PRESSURE OPERATED
DISCHARGE DELAY ASSEMBLY
INSTALL UNIT IN ANY POSITION
BELOW HORIZONTAL AS SHOWN
PREFERRED
1-7/16 in.
(37 mm)
3 in.
(76 mm)
3/4 in. TAPERED PIPE THREAD
(BUSHED 1/2 in. AS REQUIRED)
ALLOW SUITABLE CLEARANCE
FOR MANUAL OPERATION OF
LOCKING PIN AND CONTROL
HEAD LEVER
LOCKING PIN
AND SEAL RING
LOCAL CONTROL LEVER
(OPERATED POSITION)
LOCAL CONTROL HEAD
SWIVEL NUT TO PERMIT
CONTROL TO BE TURNED
AND SECURED IN
POSITION DESIRED
OUTLET
2-1/8 in.
(54 mm)
2-1/8 in.
(54 mm)
INLET
PIPE
(BY INSTALLER)
15-1/8 in.
(384 mm)
22-9/16 in.
(573 mm)
5-11/16 in.
(144 mm)
1-3/4 in.
(44 mm)
TO OPEN
CLOSED
2-9/16 in. R.
(64 mm)
TO OPEN
IN
OUT