Fire Alarm Shutdown

Where HVAC systems are required to be interlocked to the fire alarm system and/or duct smoke detectors, the shutdown of the HVAC system shall be hardwired to the HVAC equipment and not rely on the BAS system unless the BAS system is approved for such actions.

Guidance: In general the BAS and fire protection interfaces shall be kept as simple as possible. Required NFPA functions shall only be performed by approved controls

The Building Automation System (BAS) control system shall have a dedicated fire alarm shutdown input to detect the status of the fire alarm shutdown controls. When the BAS system detects a fire alarm shutdown alarms shall be generated and the BAS shall position valve, damper and fan signals to match the hardwired shutdown positions.

The fire alarm shutdown protection shall not override freeze protection control. Guidance: During a fire alarm shutdown, the freeze protection control shall not be inhibited to provide such functions as closing the outside air damper or opening a heating control valve, etc.

Hand-off-auto switches shall never bypass fire alarm shutdown functions unless they are part of an approved smoke/fire control system.


Hi…You’ll need to twofold check the shut down necessities along with your Mechanical Design or AHJ. In a few regions, units beneath 2000cfm are not required to closed down on FA. I accept most smaller than expected parts are beneath 2000cfm. Not an master in this area but by and large do not see FA transfers closing down Smaller than expected parts. You will have a extraordinary case or possibly we have a few nearby exemptions.