DIYbanter - View Single Post - What happens electrically when the oil furnace doesn't ignite?

In article , says...

mm wrote:

I know what happens electrically with my current old oil furnace when
the oil doesn't ignite. A relay is tripped that has to be reset
mechanically with a red button.

But someday soon I may need a new furnace and I don't know how they
work.

Here is the reason: I'm getting a new burglar alarm (mine went up in
smoke, literally) and my friend told me they had a built-in temp
sensor, to notify them if the house temp got too low.

It turns out this model requires an add-on switch, and while trying to
decide where to put it and how to wire it, it occurred to me: Why
wait until the house is getting too cold. Then if I'm away, my
friends only have a day or two to get there and fix the furnace and
warm the place up. Why not also notify the monitoring company there
is a problem when the furnace first tries to ignite and can't (no
fuel, nozzle clogged, furnace broken, etc.)

My current furnace has a mechanical relay, a latching relay I
presume????

and if it is not double pole or double throw, I could buy a latching
relay that is, and use it instead and connect the unused pole to
notify the alarm that the furnace needs resetting. I would give that
its own zone, so that I would notice it even when I was home, when
setting the alarm.

But I'm guessing everything is transistorized in a new furnace I buy.
I don't have trouble working with IC's and circuit boards, but that
doesn't mean there will be a place to connect. Is there any way to do
the same thing with the new furnace? Is there a brand of furnace that
would make this easier than other brands?

In the daze of my youth, we just used a 120 volt rated thermostatat to
switch on a red bulb in the front window if the room temperature dropped
because the furnace failed.

The friendly neighbors would take care of it from there.

Not eggsackly foolproof if you lost power or that one lightbulb decided
to fail there's better ways now.

No "red light district" jokes please, we heard 'em all back then.

Thanks for the mammaries,

Jeff

--
Jeffry Wisnia

(W1BSV + Brass Rat '57 EE)

"Truth exists; only falsehood has to be invented."

Check out the following link. This is an oil burner primary control with alarm
contacts that could easily be incorporated in your alarm system.

http://customer.honeywell.com/Honeyw...spx/R7184U1004