10
Figure 10.
Check/Adjust ‘Z’ Dimension for ‘F’ Heads
Section: Mount Burner on Appliance
Make all adjustments exactly as outlined in the
following information.
Incorrect Adjustments could cause combustion
problems, carbon deposition from flame
impingement, heavy smoke generation and fire
hazard.
Adjust the ‘Z’ dimension
to the required
specification.
Check/Adjust ‘Z’ Dimension - ‘F’ heads
1. The important ‘Z’ dimension is the distance from the face
of the nozzle to the flat face of the head (or heat shield, if
applicable). This distance for F heads is 1-⅛” (1-⅜” 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 figure. 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 head. A Beckett T501 gauge
may also be used.
○
Slide the nozzle line forward or back until this
dimension for F heads is 1-⅛” (1-⅜” to the face of the
heat shield, if applicable).
○
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.
1-3/8”
1-1/8”
Burner Dimensions
For usable length A (inches)
Dimension
(inches)
F Head
L1 Head
L2 Head
V1 Head
H
(nozzle to head), +1/32
N/A
1/4
7/32
1/4
L
(Total tube length)
A+1/2
A+1/2
A+1/2
A+1/2
R
(electrode length), + 1/4
A+2-1/4
A+1-1/8
A+1-1/8
A+1-1/8
S
(adapter to static plate), + 1/16
(Note 1)
1-3/8
1-3/8
1-3/8
Q
(nozzle line length),
A+ 15/16
A+ 3/16
A+ 3/16
A+ 3/16
Z
(F head-no heat shield)
(F head-with heat shield)
(L1 head w/straight shroud)
(L1/L2/V1 head w/conic shroud)
1-1/8
1-3/8
N/A
N/A
N/A
N/A
1-3/8
1-3/4
N/A
N/A
N/A
1-3/4
N/A
N/A
N/A
1-3/4
Note 1: 1-3/8 for dimension A less than 4”; 1-5/8 for dimension A from 4” through 4-1/2 “,
2-13/32 for dimension A greater than 4-1/2”.
