When testing a waterflow switch How long shall it take for a signal to be generated at the fire control unit?
The switch must activate within 90 seconds; however, the FACP has 10 seconds to process and then indicate the alarm signal audible and visually. Thus, the answer is a total of 100 seconds – 90 seconds for a maximum retard setting, plus 10 seconds for the FACP to process the signal.
Why does my building fire alarm keep going off?
The most likely reason smoke detectors go off unexpectedly is that people aren’t changing the batteries in them often enough. In most sensors you might think of, the strength of the signal goes up when they detect what they’re supposed to.
What are the secondary functions of a fire alarm system?
What is the secondary functions of a fire alarm system? Capture elevators, unlocking exit doors, start fans, close smoke dampers, pressurizing stair towers and elevator shafts, and closing smoke doors.
What are the two types of fire alarm systems?
There are two main categories that fire alarm systems fall under: manual and automatic. A manual system requires the attention of a person to activate it (a lever at a pull station), whereas an automated system is triggered automatically (via smoke or heat detection).
How a waterflow alarm is generated at the fire alarm control panel?
A riser check valve utilizes a vane type waterflow detector to monitor water- flow in the fire sprinkler system. When a continuous flow of water — occurs, a standard check valve or a waterflow detector monitors the system and activates an alarm after a predetermined amount of time.
What is a waterflow alarm?
A water flow detector, commonly produced by System Sensor, is an electro-mechanical device designed to send an alarm to a fire alarm panel and/or fire department when a continuous flow of water occurs through the fire sprinkler system’s piping from an activated sprinkler head or leak in the system.
What is the difference between pressure switch and flow switch?
One visible difference between pressure switches and paddle flow switches is the lack of a paddle in the latter. Pressure switches have no parts that reach the open pipe.
Is NFPA 1221 mandatory?
Reflecting industry changes and new technologies, the 2016 edition of NFPA 1221 is essential to public welfare in every community. NFPA 1221 provides procedural and physical criteria for the installation, performance, operation, and maintenance of public emergency services communications systems and facilities.
Is NFPA Code 72?
The NFPA 72 (National Fire Alarm and Signaling Code) is a standard published by the National Fire Protection Association every 3 years for installation of fire alarm systems and emergency communication systems in the United States.