willald wrote:
Has anyone that uses compressor blow-out method, ever had something like this happen? Any other ideas/theories on what may have caused the CO detector to go off in this case?
It wasn't CO. A compressor works by, well, compressing air. A standard unit will raise the ~14 PSI of atmosphere to ~125 PSI or about 9 times atmosphere. If the compressor is say 20 gallons, that means it contains about 180 gallons of air. For that compressor to have enough CO in the tank (aside from the fact it likely cycled at least once during the winterizing process) to set off the detector it had to be nearly toxic levels in the garage when it ran the first time.
It was almost certainly just water vapour from blowing the lines.
From the First Alert website "Alarms should be located 10 feet away from sources of humidity like showers."
Aerosol water will set them off very quickly.
