GILLIG LOW FLOOR, Руководство по обслуживанию

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Electrical System
FIRE DETECTION SySTEM
To protect passengers and the coach from fire, a fire detection system has been installed. The fire detec -
tion system consists of red linear heat detection wires, which are routed throughout the engine and air
conditioning compartments (Figure 9- 47). The wires lead to the fire alarm bell and indicator light in the
driver’s area. The red linear heat detection wires have two wires within that are insulated from each oth-
er. When a fire occurs in the engine or air conditioning compartments or when the temperature exceeds
348° F, the insulation surrounding the two wires melts, causing them to contact each other. This contact
causes the wires to complete a circuit to ground, which in turn leads to the activation of the fire alarm
bell and indicator light. At this point, the engine fan and the air conditioning/heating unit automatically
shut down.
Testing Linear Heat Detector
At the Weather-Pack connector at the end of the wire loop, use a corresponding two-pin Weather-Pack
connector with a jumper lead to short out the linear heat detection wire, or carefully (so as not to damage
the terminals) short it out with a piece of wire. This will activate the warning bell in the driver’s area,
turn off the air conditioning fan, turn off the hydraulic flow to the engine fan (but the fan will still be free
wheeling), and light the “Fire” indicator on the light bar, just as if the linear heat detection wire had been
shorted out by heat in the engine and/or air conditioning compartments. Note: If your bus is equipped
with a Kidde Santa Barbara Dual Spectrum dry chemical fire suppression system, do not perform
this test. Contact your Gillig Service representative for more information.
Replacing Linear Heat Detector
When a fire or overheating condition occurs in the engine compartment and/or air conditioning compart -
ment, or when the temperature exceeds 348° F, the linear heat detection wires should be replaced. When
installing a new linear heat detection wire:
1. Install a two-way connector (such as the Weather-Pack connector that was on the original wire)
on the loose end. The connector must come with a cover to keep the connector terminals clean
and free from moisture.
2. Carefully (so as not to damage terminals in the connector) short the wire to make certain that
the fire alarm bell and indicator lamp are operative. A shorting device can be made from a corre -
sponding connector, which will enable quick and safe shorting for testing linear detection wires.
3. After testing, place the cover over the connector.
Gillig supplies complete replacement linear heat detection cables. Gillig
recommends using the Gillig replacement cables for this crucial system.
Please notify Gillig of any events involving this linear sensor.