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15.10 Hold condition
Activation of the Hold input or a fault on the monitored wiring of the Hold circuit will cause the Hold
Activated indicator to illuminate on the module and any status units or ancillary boards connected to it.
If the ECU is in the activated condition and the pre-release timer is running then the extinguishing
release sequence will be halted and the pulsing 2
seconds off.
Release of the Hold input will re-start the pre-release timer from the beginning.
15.11 Released condition
The released pressure switch input will be connected to a pressure switch mounted on the extinguishing
cylinder which operates when the extinguishing gas has been released. This will activate the released
indicator on the ECU. If the extinguishing gas has been released by mechanical means i.e. the ECU is
not in the activated condition, operation of the released pressure switch input will establish the Released
condition.
15.12 Low pressure switch
The low pressure switch input will be connected to a pressure switch on the extinguishing cylinder and
will operate if the pressure in the cylinder falls below a set point. This will happen after the extinguishing
gas has been released or because of a leak. The fault LED on the ECU will illuminate and the panel
buzzer will sound.
15.13 Manual only mode
The mode of the system can be toggled between Manual Only and Automatic & Manual by operating the
Mode select keyswitch on the ECU.
When a module is in Manual only mode, the extinguishing gas cannot be released by the operation of
automatic detectors.
The mode can also be changed to manual by the external mode select input or by a keyswitch on a
status unit. Any mode select input that is switched to Manual only mode will override any keyswitches
switched to Automatic and Manual mode. All inputs must be switched to Manual and Automatic mode for
a module to be in Automatic and Manual mode.
15.14 Manual Release
ECU may be manually activated by one of the following:
•
The manual release control on the front of the ECU
•
A remotely mounted Manual release callpoint connected to the monitored manual release inputs
•
A manual release control mounted on a status indicator.
Activation of any of these Manual release controls will immediately activate the ECU and begin the pre-
release timer if configured to have a time delay for Manual release inputs.
15.15 Abort input
The ECU has the facility for connection of an Abort control. Operation of the Abort input during the pre-
release delay time will cancel the extinguishing release timer i.e. the Extinguishing will not be released.
The module can be immediately reset from this condition.
Activation of the Abort input in a non-alarm condition will indicate an abort circuit fault and disable the
gas extinguishing release circuit
TM206
nd
stage sounders shall change to 1 second on, 2
31 of 35
Issue 1.0
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