On Wed, 11 Dec 2013 12:15:35 -0800, Oren wrote:

Um, "Ignition Lockout Timer"? Isn't it to turn off the gas for a
duration when the furnace fails to fire? Reduces gas from filling the
space - until gas has dissipated, so you don't blown the roof off the
house?

I don't understand *what* it does yet.
Sure, it's called a "lockout timer", so it locks out the gas, I guess.
But, how does it figure out when/if to lock out?

All I can tell, so far, is that it's a normally open SPST switch.
http://www.lennoxproducts.com/wp-con.../HH72CH003.pdf