Nozzle Installation; Check/Adjust Electrodes - Beckett NX50LG Manual

Trained Service Technician's Regular Maintenance
, Nozzle Installation 4
JACAUTIONIL
Protect Nozzle from
Damage
A damaged nozzle could cause impaired com-
bustion, sooting, puffback of hot gases, smoke,
oil leakage and potential fire or asphyxiation
hazards.
• Use care when handling, removing and installing oil
nozzles.
• Carefully follow the guidelines provided in this sec-
tion.
Perform the following steps when replacing a nozzle.
1. Remove the nozzle line assembly to gain access
to the nozzle.
,
,
,
Use a 5/8" open-end wrench to carefully remove
the existing nozzle.
Inspect the nozzle adapter before installing the
new nozzle. If it is grooved or scratched on the
sealing surface, replace the nozzle line assem-
bly. If the surface is damaged, oil could leak at
the nozzle to adapter joint, causing serious com-
bustion problems.
Protect the nozzle orifice and strainer when in-
stalling. If the orifice gets dirt in it or is scratched,
the nozzle will not function properly.
To install a new nozzle, place a 3/4" open-end
wrench on the nozzle adapter. Insert the nozzle
into the adapter and secure finger tight. Finish
tightening with a 5/8" open-end wrench. Use care
to avoid bending the burner head support legs or
electrodes.
,
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 noz-
zle alignment could be seriously affected.
,
Do not over-torque the nozzle when install-
ing. This will cause deep grooves in the nozzle
adapter, preventing a seal when a new nozzle is
installed.
,
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.
Nozzle Flow Rate by Size
Nozzle flow rate U. S. gallons per hour of No. 2 fuel oil when
pump pressure (psig) is:
Nozzle 125 140 psi 150 175 200 =
psi (factory psi psi psi
std.)
size
(rated
at 100
psig)
0.40
0.50
0.45 0.47 0.49 0.53 0.56
0.56 0.59 0.61 0.66 0.71
0.60 0.67 0.71 0.74 0.79 0.85
0.65 0.73 0.77 0.80 0.86 0.92
0.75 0.84 0.89 0.92 0.99 1.06
0.85 0.95 1.01 1.04 1.13 1.20
0.90 1.01 1.07 1.10 1.19 1.27
1.00 1.12 1.18 1.23 1.32 1.41
1.10 1.23 1.30 1.35 1.46 1.56
1.20 1.34 1.42 1.47 1.59 1.70
1.25 1.39 1.48 1.53 1.65 1.77
1.35 1.51 1.60 1.65 1.79
1.50 1.68 1.77 1.84
1.65 1.84
1.75
Page 12
9. Carefully check and realign the electrode tips af-
ter replacing a nozzle, ensuring the electrode set-
tings comply with Figure 7.
10. If the head was removed when replacing the noz-
zle, 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 8.
Check/Adjust Electrodes
Check the electrode tip settings, as shown in Fig-
ure 7. If necessary, adjust by loosening the elec-
trode clamp screw (Figure 8) 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 re-
position it with no gap between the nozzle adapter
and hub.
Figure 6. - Electrode tip gap and spacing
5/32" GAP
SK9664
1/4" above [
nozzle center
(
..... "t 3/32" Nozzle-to-tip
Spacing
RWB 6104 BNX R02