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Shall be connected to the fire alarm system in accordance with the requirements of nfpa 72 national fire alarm code. Is the detector on the supply fan inlet or supply ducting.
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In reading the section of the nfpa that covers the shutdown of hvac equipment when the fire or smoke detection and alarm system fas.
Fire alarm fan shutdown wiring diagram. I have done this in commercial environments with rtus that have a fan shutdown input but what about a residence. I am wanting to shutdown my hvac system via a relay if there is a fire or carbon monoxide alarm. Normaly there is a fire alarm shut down link in the control side of the air connormaly closed circuit install a 2core fp200 from the fire alarm panel to the air con unit then provided the air con control side is 24volts use the fire alarm panel aux volt free contact to open circuit the link when the panel is in fire.
For example if the fan that needs be shut down when the fire alarm system smoke detector actuates shuts down automatically if the circuit wiring controlling the fan is cut then the system is wired in a fail safe mode and the circuit wiring controlling the fan does not have to be monitored for integrity. What i was thinking was wiring the t. Exhaust fan control make up air fan control and.
Smoke detectors for hvac shutdown the 1 website for nicet practice tests nicet study guides fire alarm code knowledge and general fire alarm topics. 21 smoke detectors used solely for closing damp ers or for heating ventilat ing and air conditioning system shutdown shall not be required to activate the building evacuation alarm. Cooling units rtu shutdown controls.
The building by individual exhaust fans and where the make up air is brought into the building by a powered make up air fan without. The first requirement 6421. Nfpa 70 national electric code article 760 covers the equipment and wiring of the fire alarm system.
Using electrical equipment such as contactorsswitchesshunt trip breakers we can control the operation on the exhaust fanssupply fans and the kitchen equipment under the main cook hood. What hvac equipment should shutdown during firesmoke signal event. Design to the fire alarm code nfpa 72 2010 2012 instructor.
Our fire alarm contractor insists that the code requires shutdown of all the hvac units on activation of the building fire alarm. Hvac shutdown by fire alarm system hvac shutdown by fire alarm system. Firesmoke damper control for post fire smoke.
Sprinkler waterflow sprinkler supervisory equipment elevator capture and shutdown door release smoke doors and damper control fire doors and fan shutdown only where these functions are actually controlled by the fire alarm system. Interconnecting wiring to the fire alarm system shall be provided by this contractor. We have up to date information on the newest fire alarm trends such as fire service access elevators mass notification voice intelligibility occupant evacuation elevators and two way communication for areas of refuge.
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