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C - Venting with sinter filter/silencer (connection "C" is marked on the time delay unit and in the
circuit symbol with [3]).
The delay time can be set from 10 to 60 seconds (7 to 55.5 seconds in accordance with FM/UL
requirements). The delay time is set to 30 seconds at the factory. The adjusting spindle has been
secured with sealing wax.
In an idle state, the non-electrical time delay unit is closed and not supplied with control gas. The
pilot line going to the quick release valves for the extinguishing agent container battery at operat-
ing connection "B" is kept depressurized via venting "C". This stops the build up of creeping pres-
sure in the pilot line and prevents the faulty release of the extinguishing agent container battery.
After detecting a fire in an extinguishing zone and once a fire extinguishing signal has been given
by the electric control device/fire detection and suppression control panel, the pilot cylinder is
opened electrically without delay. A pressure reducer downstream of the pilot cylinder reduces
and regulates the control gas to a pressure of 152 psi (10.5 bar).
This provides the control pressure at pressurized connection "A" which is internally connected to
the control input. The time delayed release of the working pressure at operating connection "B" is
achieved by filling a chamber via the control input through a defined overflow channel. Once the
predefined pressure in the chamber has been achieved, the piston slide valve is actuated and the
control pressure is released via operating connection "B".
The delay time is set by increasing or reducing the chamber volume using a hexagon socket
wrench.
Once the control pressure is withdrawn, the time delay unit immediately switches back to an idle
state automatically.
During the delay time, flooding of the extinguishing zone can be prevented only by an optional
stop valve downstream of the pneumatic time delay unit.
59
Inst. and Maint. Manual | Oxeo PR LCP | F_101921 Rev 02 | 10-2022 | en
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