On Sun, 08 Dec 2013 19:21:04 -0600, wrote:

On Sat, 07 Dec 2013 07:02:38 -0500, micky
wrote:

All these years, I've save the plastic cylinders that oil furnace
nozzles come in, and I finally looked at what they say.

All start with .75 80^ (degrees) but there is a lot of variety in what
comes next. A,B, W, and the other brand's HA and Hx. (I can't find
it right now.)

I had in my mind that the proper nozzle was listed in the owner's
manual, but now that I'm looking, it seems not. (It says 0.75, but
nothing else) How do these technicians decide what nozzle to use,
just whatever the previous guy used? If so, how come there are so
many different containers left behind?

Thanks.

Those numbers like .75 is NOT "degrees". It's the GPH rate. (gallons

Right. I could have been clearer. Thanks. I meant by that that the
symbol ^ meant degrees, a convention I think is becoming established.

per hour). A .75 will deliver .75 or 3/4 gallon in an hour if it runs
continuously. Just look at the number on your old nozzle and use the
same size. A furnace is designed for that nozzle size.

As I said, they all started .75 80^. but the spray pattern on the
plastic containers for nozzles that repairmen have left behind were
hollow, solid, and semi-solid, almost evenly divided. .

I should never have thrown away the duplicate sizes, that will teach
me to throw anything away. :-( I thought I would remember what they
were, all one value iirc, but I didn't.

UP sizing is probably not a good idea. But you could likely go down in
size. But for less heat value. I'd stick with the same number.

So I looked at the plate on the furnace some more and found a field
completely covered in dirt so I didn't know it was there. (I had
years ago uncovered the model number and a couple other values.)
After a bunch of rubbing etc. to see what was stamped, it said to use
..75 80^ "solid", so solid is what I will get.

Thanks all, for what I guess was a wild goose chase on my part.
Sorry, but I I think we all learned things.