FIRE SENSORS
Before applying power to the instrument, ensure that all detector heads are terminated according
to Fig 4 page 14 (2 wire loop powered) and at the alarm panel in accordance with connecting
detail Fig 3 Page 14.
Switch on power to the instrument. Allow ten minutes for the detector head to stabilize.
For further instruction see fire sensor supplier manual.
STANDBY BATTERY MODULE
Before connecting the system to the supply voltage ensure that the batteries are connected.
The module is designed to supply power to the instrument rack and float charge the 24v DC lead
acid standby batteries.
The no load DC output voltage from the card is set at 27.5v DC, should it be necessary to adjust
this then, having first disconnected the battery, potentiometer No VR1 should be adjusted.
The module has four L.E.D. indicators on the front panel as follows:
1. Mains ON/OFF
- Green:
When mains on
- Orange:
When mains fail
2. Battery high voltage
- Red:
Output voltage exceeds the set
limit
3. Battery low voltage
- Red:
During battery discharge voltage
has dropped below 19v.
4. Charge fail
- Amber:
Mains fail, output voltage high or
charging circuit failure.
NOTE: When the batteries are initially connected to the charger the low battery indicator may
lluminate due to the low charge state of the battery.
SERVICE - ROUTINE ATTENTION
The owner or occupier of the premises should place the supervision of the system in the charge of
a responsible executive whose duty it should be to ensure the day to day operation of the system
and to lay down the procedure for dealing with a gas alarm or fault warning. To ensure reliability
an agreement should be negotiated for regular servicing. When a service contract cannot be
arranged and employee with suitable experience of electrical equipment should be trained to deal
with the more simple servicing and instructed not to attempt to exceed the scope of such training.
Liaison should be established with those responsible for maintenance of the building fabric or
redecoration etc. to ensure that their work does not cause a fault or otherwise interfere with the
operation of the gas alarm installation. Particular attention appertaining to the Detector Head.
The operating instructions should be kept available preferably with the control unit, all faults,
service tests and routine attention given should be recorded.
DAILY: A check should be made that any fault condition which may be indicated is in fact being
attended to and that all other indicators are normal.
WEEKLY: In plants involving a high risk process or having gases which may cause loss of sensitivity
a check on calibration should be carried out.
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