On Wed, 11 Dec 2013 20:00:29 +0000 (UTC), "Danny D."
wrote:

It is called a "Combustion Safety Control Lockout Timer" (whatever that
is supposed to mean) over here, also sold for $279:
http://www.bestbuyheatingandaircondi...Code=r-lockout

So, it seems to be an expensive normally opened timed switch.

It seems to have a timer of about five minutes.
After five minutes, presumably it closes the SPST switch.
I'm still trying to figure out what it's supposed to do.

It's hooked up *before* the pilot, so, being normally open is
odd.
http://technicalhotandcoldparts.com/...r-control.html


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?

Something like that