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D7292/12
PREPARATION
ENSURE THE SUPPLY IS OFF BEFORE COMMENCING INSTALLATION.
A
.
Check that you have the correct alarm to satisfy the system specification.
Gas group and temperature?
Audible or Visual alarm or both?
Supply
voltage?
Sound signal selected ?
Strobe lens colour correct ?
Suitable mounting location ?
Cable connection and installation method ?
B. Location
•
Select a suitable location for the alarm with regard to the area to be covered by the
sound or flash signal.
•
The surface should be flat in the area of the fixings and the material suitable to carry the weight of the
alarm.
•
For a sounder, the sound signal pattern is omni-directional and the sounder should be mounted with
the Horn at the top.
•
For a strobe, the alarm should be mounted with the lens at the bottom and out of direct sunlight.
•
In exceptional circumstances, the alarms can be mounted horizontally or for the strobe, with the lens
uppermost.
Do not mount the sounder with the Horn downwards.
•
The cable must be connected to the alarm via a sealed component and this must be located adjacent
to the cable entries in the alarm body.
•
Suitable sealing devices are a sealed threaded nipple or a sealed gland; the choice of device depends
upon the gas group applicable to the installation and on the chosen installation method.
•
There are two entries to the alarm body and one or both may be used depending upon the number of
cable cores required by the system arrangement.
•
It is preferable that the cable and its seal be fitted at the factory or approved workshop; however the
method for assembling the cable and sealed components is described below.
IMPORTANT
THE ALARM IS A PRECISION INSTRUMENT. TAKE EXTREME CARE WHEN HANDLING.
•
Particular care is needed when removing or replacing components which form part of the flameproof
enclosure.
•
Exposed joint surfaces must be protected and not have contact with dust or dirt, or be knocked against
any object.
•
The end flanges must be fitted squarely and on no account is force to be used. The flange must not
be hammered, levered with a metal instrument or the fixing screws used to pull down the flange.
•
With care and patience, it will be found that the flange enters the body without difficulty.
I. Combined Sounder/Strobe
It is recommended that the unit be stood upright in a cup-shaped base holding the strobe section.
Remove the Horn from the sounder flange by unscrewing the three self-tapping screws (pozi drive head) in
the dome of the Horn.
Unscrew the four socket headed screws, two washers and 'O' ring in the flange. (Socket head wrench 4mm
(5/32") across flats). These screws will not be fully tightened if the alarm is not a factory-sealed unit.
IMPORTANT: TAKE EXTREME CARE WHEN REMOVING THE SOUNDER FLANGE FROM THE MAIN
BODY.
DO NOT USE THE TRUMPET AS A LEVER.
•
Unplug the pressure unit cable from the PCB assembly.
•
The exposed joints must be kept clean of dirt and not damaged in handling.
•
Lay down the sounder flange assembly to one side on a clean piece of the packing material.
