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Fire alarm shut down...

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ibew441dc

ibew441dc

Senior Member
I do not have a copy of NFPA 72 in front of me and I need some help.

Air handlers that push air over __________ tons , or_____________CFM require FA shut down ?


Thanks ,

Ibew441dc
 
Ron,

Thanks , I'll look into that. Just off hand are you familiar with what I'm talking about.

The reason why I'm asking this is , I am trying to get a change order for my company. We are the electrical contractor , and are installing the fire alarm raceways. The drawings do not show this , but I'm almost positive that the requirement exists for FA shut down on units of 2000cfm or larger and need some reference power.


thanks,

Ibew441dc
 
It's absolutely there.
If you tell me which mech code, I can paste the text for you here.
Depending on the fire alarm system, it may be just an addressable device on the nearest loop to be added within 3' of the motor starter.
 
Ron,

Lets go with both, NFPA 90 and the International Mechanical Code. I'm curious now to see if they are different.

Thanks,

Ibew441dc
 
ibew441dc said:
I do not have a copy of NFPA 72 in front of me and I need some help.

Air handlers that push air over __________ tons , or_____________CFM require FA shut down ?


Thanks ,

Ibew441dc
Click to expand...
I'm going to guess !/2 ton and 2000 CFM
 
From the IMC:

606.2.1 Return air systems. Smoke detectors shall be in -
stalled in return air systems with a design capacity greater
than 2,000 cfm (0.9 m3/s), in the return air duct or plenum
upstream of any filters, exhaust air connections, outdoor air
connections, or decontamination equipment and appliances.

606.4 Controls operation. Upon activation, the smoke detec -
tors shall shut down the air distribution system. Airdistribution
systems that are part of a smoke control system shall switch to
the smoke control mode upon activation of a detector.
 
mdshunk said:
Yes. I'll sing you a little song....

".... Did you ever know that you're my hero? You are the wind beneath my wings..."
Click to expand...
Well that should keep me from guessing anymore.:roll:
 
mdshunk said:
From the IMC:

606.2.1 Return air systems. Smoke detectors shall be in -
stalled in return air systems with a design capacity greater
than 2,000 cfm (0.9 m3/s), in the return air duct or plenum
upstream of any filters, exhaust air connections, outdoor air
connections, or decontamination equipment and appliances.

606.4 Controls operation. Upon activation, the smoke detec -
tors shall shut down the air distribution system. Airdistribution
systems that are part of a smoke control system shall switch to
the smoke control mode upon activation of a detector.
Click to expand...
The IMC is opposite the requirements contained in NFPA 90A. NFPA 90A requires supply side smoke detection for HVAC systems over 2000 CFM and return side over 15000 CFM.
Section5.14.3.1 of NFPA 72 references NFPA 90A
 
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