On the lower half of each alarm module is a four-
way position switch that allows you to place the
individual alarm module in the following modes:
NORMAL: This is the normal operation mode.
With the sensor contacts open, the upper indicator
lamp in the module is on steady while the lower lamp
is off. If an alarm condition occurs, the sensor con-
tacts will close; the upper lamp will then flash while
the lower lamp remains off and an alarm command
from the module actuates atone generator, producing
a wailing alarm. If the sensor loop is open-circuited,
with the selector switch in the NORMAL position, the
alarm module will signal a supervisory failure. In this
case, the upper lamp will be off while the lower lamp
will be steadily on, and the tone generator will come
on, producing a pulsating alarm.
STANDBY: This is the position for acknowl-
edging an alarm. If the selector switch is moved from
the NORMAL to the STANDBY position during an
alarm condition, both the upper and lower indicator
lamps will be steadily on and the audible alarm will
be silenced. When the alarm condition is cleared with
the selector switch in the STANDBY position, the
lower lamp will change to a flashing mode and the
upper lamp will go out. Also, the command will be
fed to the tone generator, producing a pulsating alarm.
CUTOUT: With the selector switch in the
CUTOUT position, the upper lamp is out while the
lower lamp is steadily on. In this position, power is re-
moved from the sensor loop to facilitate maintenance.
TEST: The TEST selector switch position sim-
ulates an alarm condition. The upper indicator lamp
flashes while the lower lamp is off, producing a wail-
ing alarm.
LIQUID-COOLING SYSTEM
MAINTENANCE RESPONSIBILITY
The most important responsibility that you have as
a Fire Controlman that will extend the life of the
liquid-cooling system components and increase the
reliability of the cooling system is how you perform
preventive and corrective maintenance according to
the PMS. Properly performed preventive maintenance
drastically reduces the amount of corrective mainte-
nance necessary. When cooling systems are neglected,
they deteriorate very quickly. To restore the cooling
system to its proper performance, you may have to
undertake extreme and costly repairs.
The PMS responsibility of the cooling system
varies from one system to another. On some systems,
the engineering department has the total responsibility
of preventive and corrective maintenance. On other
systems, you will share the maintenance responsibility
jointly with the engineering department. In these
situations, the Fire Controlman will probably perform
the preventive maintenance, and the engineers will
perform the corrective maintenance on major com-
ponents.
When assigned the responsibility for maintaining
the cooling system, you should perform the preventive
maintenance in accordance with the maintenance
requirement cards (MRCs) for that equipment to
maximize the operation of the cooling system.
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