TM204
43 of 56
Issue 1.1
8.13 General Fault – Detection Module
The general fault LED will illuminate under any fault condition.
This LED will also light if the WRITE ENABLE switch has been left in the Access Level 3 position and the
ENABLE CONTROL keyswitch is turned off.
8.14 Lamp Test
All LED indicators on the detection module can be tested at any time by pressing the Lamp Test button.
The ENABLE CONTROL keyswitch does not need to be operated to carry out this test.
Indicators on individual extinguishing modules can be lamp tested by holding down the EXIT button for
more than 2 seconds.
8.15 Hold Condition
Activation of the Hold input or a fault on the monitored wiring of the Hold circuit on a module or at a
remotely mounted status indicator will cause the Hold Activated indicator to light on the module and on
any status units or ancillary boards connected to it.
If the extinguishing module is in the Activated condition and the pre-release timer is running, then the
extinguishing release sequence will be halted and the pulsing 2
nd
stage sounders shall change to 1
second on, 2 seconds off.
Release of the Hold input will re-start the pre-release timer from the beginning.
8.16 Released Condition
The released pressure switch input will be connected to a pressure switch mounted on the extinguishing
cylinder which operates when the extinguishant has been released. This will activate the released
indicator on the control panel. If the extinguishant has been released by mechanical means i.e. the
control panel is not in the activated condition, operation of the released pressure switch input will
establish the Released condition. (See also 7.2.8)
8.17 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 extinguishant
has been released or because of a leak. The fault LED on the extinguishing module and on the detection
module will illuminate, the panel buzzer will sound.
8.18 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 extinguishing module.
When a module is in Manual Only mode, the extinguishant 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.
