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Instruction Manual – Model AF Oil Burner
Beckett
Prepare burner & site
Check/adjust “Z” dimension
Figure 2
– “F” heads (see Table 3 for dimensions)
Z = Distance from nozzle tip to face of head or heat shield
SK9458
1. See Figure 2 above.
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.
Table 3
– Dimensions for Figure 2
For usable length A
(inches):
Dimension
(inches)
F
head
L (total tube length) A +
1
/
2
R
(electrode length), ±
1
/
4
A
+ 2
1
/
4
S (adapter to static plate), ±
1
/
16
(Note 1)
Q (nozzle line length) A +
15
/
16
Z (F head – no heat shield)
(
F
head – with heat shield)
1
1
/
8
1
3
/
8
Note 1: 1 ⅜ for dimension A less than 4”; 1 ⅝ for dimension A from 4” through 4 ½”;
2
13
/
32
for dimension A greater than 4½”
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 Figure 2. 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 T 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.
NOTICE
6