General Information
06-237518-001
1-21
July 2018
1-8.3
Manual Emergency Release
In the unlikely event of total power failure and total drainage of the emergency batteries, the
cylinder bank can be manually released by removing the locking pin and turning the handle on
the manual release unit (fitted next to the solenoid valve) on the master cylinder.
For systems with selector valves, identify the selector valve and associated low pressure
solenoid. Remove the locking pin from the manual override on the solenoid valve and turn the
thumbscrew to actuate allowing the pressure to open the required selector valve.
The selector valves should always be left in the closed position (standby), and only opened
during a system discharge. Following a system discharge, the selector valves must be closed
manually using the handle supplied.
Note:
Where allowed by local Authority Having Jurisdiction. The feature for manual emergen-
cy release is not to be included in system installations in Germany due to regulations
by VdS.
1-9
FLOW CALCULATIONS
Flow calculations are to be based on the approved isometric drawings, and should be verified
prior to installation of the nozzles.
Any significant changes shall be evaluated and if necessary the flow calculation repeated and
orifices in nozzles replaced with ones suitable for the as-built system.
All calculations to determine the size of pipes and nozzle orifices must be carried out using the
software related to the Agent used.
1-10
PRESSURE RELIEF/VENT
When released, fixed fire extinguishing systems employing compressed gases will introduce an
additional volume of gas due to expansion within the room.
To compensate for the increase in pressure, a suitable means of pressure relief/vent
opening(s) to free air shall be employed.
The free area of these openings/vents shall be sufficient to avoid structural damage.
Normal rooms can withstand an increase of pressure of approx. 5 mbar (500 Pascal). The
structural strength should always be obtained in writing from the client/end user or project
consultant. If unable to obtain such information, use the lowest available structural strength
within the hydraulic calculation software.
Pressure relief/vents should always have a fire rating in accordance with the structural element
in which they are sited. Large glass surfaces and light constructions may demand a lower
pressure than 5 mbar (500 Pascal).
Pressure relief/vents should be fitted at high level, clear of any direct nozzle discharge, and at
the end of the discharge the pressure relief/vent shall close maintaining the extinguishing
concentration for as long as possible. Gravity dampers or pressure rated dampers can be used
for this purpose
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