The two signal wires of the fire alarm do not distinguish between positive and negative poles. But the two wires can not be shorted. In the same loop, the signal wires can be connected with tree form or network form.
The installation of point type smoke and heat fire detectors shall meet the following requirements.
1.The horizontal distance between the detector and the wall or beam should not be less than 0.5m.
2.There should be no shielding within 0.5m of horizontal distance around the detector.
3.The horizontal distance between the detector and the nearest air outlet of the air conditioner should not be less than 1.5m. The horizontal distance between the detector and the orifice of the porous air supply ceiling should not be less than 0.5m.
4.When installing the detector on the inner walkway ceiling with the width less than 3m, it is best to install the detector in the center. The installation spacing of point-type heat detectors shall not exceed 10m. The installation spacing of the point-type smoke detector shall not exceed 15m. The distance from the detector to the end wall shall not be greater than half of the mounting distance.
5.The detector should be installed horizontally. When it is necessary to install the detector at an inclined Angle, the tilt angle should not be greater than 45°.
For a large space you should use an infrared beam smoke detector.
Main functions of the fire alarm system
1.Electrical fire monitoring and alarm function. The fire alarm control panel can be connected to residual current electric fire monitoring detector, then it will receive and display fire alarm signal and residual current monitoring information, and emit sound and light alarm signals.
2.The fire control system has the linkage control function, which can control the tripping signal output of the electric fire monitoring detector, it can cut off the power supply, or control other related equipment through the linkage plate.
3.Fire alarm system has the function of fault detection, it can automatically detect the bus (including short circuit, break circuit, etc.), component fault, power failure, etc. It can send out the fault alarm with sound and light signals, and through the liquid crystal to display the fault location, time, total number of faults as well as the address and type of fault parts and other information.
4.The fire alarm system has shielding function, which can bypass every electrical fire monitoring detector.
5.The fire alarm system has network communication function and RS-232 communication interface, which can be connected to the electrical fire graphic monitoring system or other building automation system. The automatically uploaded electrical fire alarm information and residual current, temperature and other parameters will be centralized monitored and centralized managed by the fire alarm panel.