Copyright 2008
Certified HVAC Technicians Home Heating And Safety Secrets Revealed! all rights reserved
Free Sample - Fuel Nozzle Replacement
Here is a FREE example of the format taken from Certified HVAC
Technicians Home Heating And Safety Secrets Revealed e-book
teaching you how to replace your burner nozzle.
Studies show fouled and dirty fuel nozzles
cause a large percentage of oil fired burner failure.
Replacing The Fuel Nozzle
Always make sure the power and fuel are off
while you are working on your unit!
See electrical and fuel supply shut down procedure
(located in the full CD version).
You will need
to purchase a new nozzle prior to replacing it... the size of
the nozzle should be labeled on your furnace. If it is not you
will need to remove the old nozzle to determine the size.
If the
burner is not exposed like the one pictured here...
You may
need to remove the cover from your furnace to expose the
burner compartment.
You will
need to remove the nozzle fuel line located on the same
side as the fuel pump. This could be on the left or
right hand side of the burner.
The fuel
pump will appear very similar to the one pictured here
or...
here.
Scratch a
mark into the housing locating where the nozzle drawer
assembly is located.
Remove
the nozzle fuel line nut.
Remove
the jam nut (place in a plastic cup so you don't lose
it).
Remove
the nozzle line from the nozzle assembly fuel tube.
You may
need to loosen the drawer adjustment screw
(remember to mark it) to complete the next step.
Loosen
the screws holding the transformer down and pull it back
to open (pictured open). The transformer is usually
hinged and swings open like a door.
Remove
the nozzle assembly.
The retention head may be mounted on the nozzle
assembly (right) or the end of the burner tube
(left)... older models may not even have one.
That is one of the reasons newer models are more
efficient, they have retention heads that retain
the heat in the combustion area where it is
needed!
Remove
the retention head from the nozzle assembly (if it is
mounted there). Be careful not to bump the electrode
tips while removing the retention head. If the head is
permanently mounted (there will not be screws to remove
it), move on to the next section.
The head
is held on to the nozzle assembly with one or two screws
if it is removable (pictured).
Clean the
retention head with degreaser and light sandpaper
removing the carbon buildup.
Record
your burner electrode measurements before going any
further! Although we will show you the settings for the
majority of units, knowing the original settings will be
helpful. The vertical setting is shown here...
You will
also need to record the horizontal settings....
And forward settings.
Use the following chart and
photos to set the electrodes to the proper settings by
knowing the nozzle size (G.P.H.) and degree. For
instance... if you have a 75 G.P.H. X 60 degree nozzle
the A setting would be 9/16" to 5/8", the B setting
would be 1/8" to 3/16, and the C setting would be 5/16"
Nozzle
G.P.H.
A
B
C
45 Deg. .75 to 4.0
1/2" to 9/16" 1/8" to 3/16"
5/16"
60 Deg. .75 to 4.0
9/16" to 5/8" 1/8" to 3/16"
5/16"
70 Deg. .75 to 4.0
9/16" to 5/8" 1/8" to 3/16"
1/8"
80 Deg. .75 to 4.0
9/16" to 5/8" 1/8" to 3/16"
1/8"
90 Deg. .75 to 4.0
9/16" to 5/8" 1/8" to 3/16"
1/16"
A Setting
- Above Setting
From the center of the nozzle to the center of the
electrode tips.
B Setting
- Horizontal Setting
Between the electrode tips.
C Setting
- Forward Setting
From tip of nozzle to center of tip of electrodes.
Remove
the nozzle by placing a 5/8" wrench on the nozzle (turn
counter clockwise) and a 3/4" or 11/16" wrench on the
nozzle body (hold in position).
Spray
liquid degreaser through nozzle assembly oil supply tube
by placing the cleaner bottle against the nozzle
assembly (where the nozzle was located) and force
cleaner through the tube to flush out any contaminants.
Purchase
a nozzle... An average nozzle might read .75 G.P.H. and
80A this means the unit is using .75 gallons per hour
(if the unit would continuously run for an hour) and has
an 80 degree spray pattern. Pictured here is a .75 G.P.H.,
the angle is stamped in the same manner. The A means it
is a hollow spray pattern. Spray patterns are as
follows:
Reinstall
the retention head in the same manner that it was
removed (if the head is mounted to the electrode
assembly).
Reinstall
nozzle assembly into burner tube.
Push the
end of the nozzle assembly fuel supply tube through the
burner housing.
Adjust
the drawer assembly to its original position
(lining it up with the scratch).
Tighten
the locking screw.
Put the
nut on the nozzle fuel supply tube and gently tighten
with a pliars.
Reattach
the fuel nozzle line and tighten with the proper size
wrench.
Close and tighten the screws on the transformer.
Proceed to priming the fuel pump (located in the full version
of the e-book).
Congratulations... you have just replaced your fuel nozzle.
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