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Posted by daytona on September 13, 2006, 4:40 pm
This system has Gray Box with a 30 minute timer....so for 3 minutes each 1/2
hr the fans runs for 3 minutes and then if the CO goes above the set point
on the detectors the fans come and run until the detector gets below the
safe range. Fans ON....intakes also OPEN
One detector senses the north end of the garage and the other the south end
> "daytona" wrote:
>>The two that are in the building now are 120v and are
>>in parallel to bring in a 120v contactor coil for the fans. The Macurco
>>has
>>24v circuits
> my situation was that the existing 3 phase fans were controlled by a
> fused disconnect, like a Square D 321 NRB. So they were on 24/7.
> I installed a 12x12 j-box next to the disco and wired in a 208/24 xfmr
> and 3 pole contactor which was controlled by the CO sensor. So yeah,
> a few xtra bux but then again, they got a top shelf sensor.
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