Posted by Cliff Weir on November 13, 2001 at 20:24:24:
In Reply to: Re: Flame scanners posted by Wes on November 05, 2001 at 20:53:47:
: The purpose of a basic flame scanner is to verify the existance of a flame.
: A flame safe guard system uses the signal from the flame scanner to tell it when
: it should shut off the fuel supply and purge the combustion chamber because there is no flame.
: It also will prevent startup if it detects a flame when there shouldn't be one(as in an idiot trying to fool the flame scanner with a lighter)
: The main benifit is that in combination with a flame safe guard system it can prevent a fire side explosion.
: : i'm looking to find the purpose and benefits of a flame scanner
The purpose of the flame scanner is to verify the existence of the pilot flame, which is part of the lighting off sequence of any boiler, large or small (package or suspended, fire tube or water tube.)
The pilot flame must be varified before the main flame maxon valve will be permitted to open allowing fuel into the furnace. This is required due to the fact that if the safe gaurd was not installed and the flame was not verified and the maxon valve did in fact open the potential for a large and catastrophic explosion exists.