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Figure 4. Check/Adjust 'Z' Dimension for 'F' Heads
Z
DIM.
Adjust the 'Z' dimension to
the required specifi cation.
Incorrect Adjustments could cause combustion
problems, carbon deposition from fl ame impingement,
heavy smoke generation and fi re hazard.
Make all adjustments exactly as outlined in the
following information.
1.
The important 'Z' dimension is the distance from
the face of the nozzle to the fl at face of the head
(or heat shield, if applicable). This distance for
F heads is 1-1/8" (1-3/8" if the air tube has a
heat shield). The "Z" dimension is factory set for
burners shipped with the air tube installed. Even
if factory set, verify that the "Z" dimension has not
been changed.
2.
Use the following procedure to adjust the "Z"
dimension, if it is not correct:
○
Turn off power to the burner.
○
Disconnect the oil connector tube from the
nozzle line
○
See above fi gure. Loosen the splined nut from
the nozzle line. Loosen the hex head screw
securing the escutcheon plate to the burner
housing.
○
Place the end of a ruler at the face of the
nozzle and, using a straight edge across the
head, measure the distance to the face of the
SF/SM Burner Manual
1-1/8"
1-1/8" PLUS SHROUD LENGTH
Section: Mount Burner on Appliance
head. A Beckett T501 or T650 gauge may also
be used.
○
Slide the nozzle line forward or back until the
Z dimension for F heads is 1-1/8" (1-1/8" plus
shroud length, if using a straight edge).
○
Tighten the hex head screw to secure the
escutcheon plate to the burner chassis. Then
tighten the splined nut and attach the oil
connector tube.
3.
Recheck the "Z" dimension periodically when
servicing to ensure the escutcheon plate has
not been moved. You will need to reset the "Z"
dimension if you replace the air tube or nozzle
line assembly. The Beckett Z gauge (part number
Z-2000) is available to permit checking the F
head "Z" dimension without removing the burner
from the appliance.
Burner Dimensions - Models SM & SF
Dimension (inches)
A = Usable air length (inches)
L (Total tube length)
R (electrode length), + 1/4
S (adapter to static plate), + 1/16
Q (nozzle line length),
Z (F head w/o head shroud)
(F head-with head shroud)
Note 1: 1-
for dimension A less than 4"; 1-5/8 for dimension A
3/8
from 4" through 4-
", 2-
1/2
13/32"
Note 2: When using a straight edge.
F Head
(Measure accurately)
A Dim. + 1/2
A Dim. + 2-1/4
(Note 1)
A Dim. + 15/16
1-1/8
1-1/8 + shroud length. (Note 2)
for dimension A greater than 4-
1/2
".
9
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