That might be a far part 135 manuals reasonable theory if there were no a-coil sitting on the furnace and the duct work was over sized.
Are we talking about a carbon monoxide detector, or a carbon monoxide alarm?
The idea was to have the furnace warm up to reduce the amount of cold air blown into the home when the furnace first started.) Inshot Burners When the blower is running, it produces enough force to push air through the furnace, through the air-conditioning coil.
In most cases, elevated CO was tracked down to the use of attic or window fans at inappropriate times, limited combustion air, or blocked flues or flue caps or other appliances that had been operating in the home.
It is a fatigue crack that probably shows up in many heat exchangers. .Although both of these situations, for other reasons, are a hazard, in either case, the amount of secondary air is increased, which leans the flame out and reduces.This is why heat exchangers need to be checked.I recently had a reader email this question. I don't believe that happens though.The furnace was replaced when the air-conditioner had to be replaced.This allows carbon monoxide to exit the secondary and get picked up in the indoor air stream, I think.He also recommends checking a company's status with the BBB.org.In some rare cases, it can cause flame impingement when air from the blower enters the heat exchanger.That amount of air is based on the heat output of the gas burners and is a design decision made by a manufacturers engineering team. .
I wrote a blog post many years ago discussing that topic, and the gist of my blog post was the same as what's stated on the COmyths web site; a cracked heat exchanger probably isn't as dangerous as many folks make it out.
Find out what you need to know about your heat exchanger so you can avoid costly repair scams.
The increase in temperature between the return air and discharge air is called temperature rise. . First Alert CO alarms are good for five years.The roll out and poor combustion performance may cause CO to come out the front of an 80 afue furnace and pool in the vestibule of the furnace, eventually filling the utility room with carbon monoxide. .In all cases, there is an electronic module that supervises the system and determines whether ignition was successful and whether the furnace should continue to operate.So what's a cracked heat exchanger all about and what's the big deal?