Nozzles .559/.579

Determined · 02-01-2009, 08:55 PM

According to the information I have on my Miller Mobile Home furnace, it states that it is a .75--4.00 GPH. I went to the parts store for a .559 nozzle which they said they had in stock. When I got there they gave me a .579 and said they don't have the .559 anymore and to just set the distances in the electrodes and nozzle the same as for the .559.
While I was there a young contractor said to the clerk that the two nozzles are interchangable. He also mentioned that the only difference between the two is 2000ths. of an inch in the front of the nozzle, which is not much and won't make a difference.
He also said that .559 is a 55/90 and .579 is a 57/90. When I asked the clerk if the spray on the .579 nozzle is a 60 degree spray or a 90 degree spray he could not answer and no one else there couls tell me either.
From the information I have I gather that the Miller I have is a 60 degree spray.

Question?
Does anyone know what a 55/90 and a 57/90 means ?
Do the settings for the nozzle and electrodes change with a .579 ?
What degree/angle spray should I have a 60 or 90 ?
How far into the heat shield should I lock in the entire electrode unit ?

Determined.

**beenthere** · 02-01-2009, 10:44 PM

55x90 means .55 GPH, and a 90° spray angle.
.57x90 is .57 GPH, and 90° spray angle.

Electrodes get set flush with the face of the nozzle, and 7/16 above center of nozzle.

Determined · 02-02-2009, 05:04 PM

Thank you beenthere
I will try the setting you mentioned.

Determined · 02-03-2009, 11:10 AM

Thanks again Beenthere,

Settings were made at 3/16 between electrodes, 7/16 above center of nozzle and electrodes set flush with front of nozzle as best we could because of wear and too many times sanded or filed.
Working very good. Still a slight roar but heat is good.