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Posted by CJT on March 30, 2008, 12:37 am
CJT wrote:
> dewey wrote:
>
>> Good day, Can fan limit controls, like the Honeywell L4064B2236, be
>> used as "firestats" to control attic fans? The product descrip says
>> "on at 125 F, off at 100F, and high cutoff at 200F".
>> The prod is designed to be mounted on forced-air heating plenums, with
>> an 8" sensor wand protruding into the plenum. To be possibly used as
>> an attic fan cutoff in case of un-natural heat rise in the attic space
>> due to a fire, the unit would obviously have to be mounted with the
>> sensor wand sticking out into the ambient air in the attic. Would the
>> unit operate effectively in this manner? Questions about this type of
>> device to my local Home Depot evoke blank looks and fruitless global
>> inventory searches. They've never even heard of a "firestat" for auto
>> cutoff of forced-air systems of any kind, and nothing listed uniquely
>> as "firestat" comes up for me on any internet search engines - just
>> fan limit controls. Thanks!
>
>
> I don't think that would meet code. At least the attic fan I bought
> specified that an interlock switch must be used and, as I recall, the
> code says you must follow manufacturer instructions.
>
Oops, I may have misinterpreted what you asked. You're saying in
addition to the interlock with the furnace?
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