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Perform the following steps when replacing a nozzle.
1.
Remove the nozzle line assembly to gain access to
the nozzle.
2.
Use a 3/4" open-end wrench to hold the nozzle
adapter. DO NOT attempt to remove or replace
the nozzle without securing the adapter, as nozzle
alignment could be seriously affected.
3.
Do not squeeze the electrodes when handling the
nozzle line assembly. Excessive force could change
the electrode tip settings or damage the ceramic
electrode insulators.
4.
Use a 5/8" open-end wrench to carefully remove the
existing nozzle.
5.
Inspect the nozzle adapter before installing the
new nozzle. If it is grooved or scratched on the
sealing surface, replace the nozzle line assembly.
If the surface is damaged, oil could leak at the
nozzle to adapter joint, causing serious combustion
problems.
6.
Protect the nozzle orifi ce and strainer when
installing. If the orifi ce gets dirt in it or is scratched,
the nozzle will not function properly.
Table 6 - Nozzle Flow Rate by Size
Nozzle fl ow rate U. S. gallons per hour of No. 2 fuel oil when
pump pressure (psig) is:
Nozzle
125
140 psi
size
psi
(factory
(rated at
std.)
100 psig)
0.40
0.45
0.47
0.50
0.56
0.59
0.60
0.67
0.71
0.65
0.73
0.77
0.75
0.84
0.89
0.85
0.95
1.01
0.90
1.01
1.07
1.00
1.12
1.18
1.10
1.23
1.30
1.20
1.34
1.42
1.25
1.39
1.48
1.35
1.51
1.60
1.50
1.68
1.77
1.65
1.84
-
1.75
-
-
Weil-McLain Ultra Oil NX Burner Manual
Section: Trained Service Technician's Regular Maintenance
150
175 psi
200
psi
psi
0.49
0.53
0.56
0.61
0.66
0.71
0.74
0.79
0.85
0.80
0.86
0.92
0.92
0.99
1.06
1.04
1.13
1.20
1.10
1.19
1.27
1.23
1.32
1.41
1.35
1.46
1.56
1.47
1.59
1.70
1.53
1.65
1.77
1.65
1.79
-
1.84
-
-
-
-
-
-
-
-
7.
To install a new nozzle, place a 3/4" open-end
wrench on the nozzle adapter. Insert the nozzle
into the adapter and secure fi nger tight. Finish
tightening with a 5/8" open-end wrench. Use care
to avoid bending the burner head support legs or
electrodes.
8.
Do not over-torque the nozzle when installing. This
will cause deep grooves in the nozzle adapter,
preventing a seal when a new nozzle is installed.
9.
Carefully check and realign the electrode tips after
replacing a nozzle, ensuring the electrode settings
comply with Figure 12.
10.
If the head was removed when replacing the
nozzle, carefully reconnect the head to the nozzle
adapter. Make sure to align the key in the support
leg with the keyway in the nozzle adapter and
to butt the head support to the nozzle adapter
shoulder, see Figure 10.
Check/Adjust Electrodes
Check the electrode tip settings, as shown in Figure 12.
If necessary, adjust by loosening the electrode clamp
screw (Figure 10) and slide/rotate the electrodes as
necessary. When the adjustment is complete, securely
tighten the clamp screw.
Note that if the throttle cup is moved be sure to
reposition it with no gap between the nozzle adapter and
hub.
Figure 12. – Electrode tip gap and spacing
5/32" GAP
SK9664
1/4" above
nozzle center
3/32" Nozzle-to-tip
Spacing
19
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