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Trained
Service
Technician's
Regular
Maintenance
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 10O
psig)
0.40
0.45
0.47
0.49
0.53
0.56
0.50
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
9. Carefully check and realign the electrode tips af-
ter replacing a nozzle, ensuring the electrode set-
tings comply with Figure 8.
Note that if the throttle cup is moved be sure to re-
position it with no gap between the nozzle adapter
and hub.
• Check
Retention
Head
Alignment
and
Cad
Cell
Sighting
(Refer to Figure 8.)
The cad cell sighting holes in the throttle cup and
the retention head must be aligned to allow the cad
cell to detect the flame. Make sure the stamped key
in the retention head collar lines up with the keyway
in the nozzle adapter when mounting the retention
head. Note that in specific applications, the reten-
tion head may not have a sighting hole.
• Check/Adjust
"Zero"
Calibration
On burners with factory-installed
air tubes, the
zero calibration has been factory set.
Make sure
the retention head (Figure 8) is securely against
the stops in the retention ring when the adjustment
plate pointer is at "0" (Figure 5).
If the zero calibration has not been set, perform the
following procedure:
1. Install the nozzle line, with the adjustment plate
assembly attached, into the burner.
2.
Install and tighten the rear door to hold the air
adjustment plate assembly in position.
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 6.
• 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.
Figure
8.-
Electrode
tip gap and spacing
5/32" GAP
SK9664
RWB 6104 WMNX
1/4" above
[
nozzle center _/_
-'t _ 3132"Nozzle-to-tip
Spacing
.
.
.
.
7.
.
.
Slightly loosen the upper acorn nut, the splined
nut, and the lower acorn nut.
Turn the air adjustment screw clockwise to adjust
the plate with the pointer to the zero position.
Referring to Figure 8, slide the nozzle line as-
sembly forward until the retention head engages
the fixed stops in the retention ring at the end of
the air tube.
Tighten the upper acorn nut securely.
The rear door must be kept tightly closed.
The
adjustment screw may now be turned to adjust
the head/air setting.
Turn the adjusting screw to a setting ½ number
lower than the proper set point as indicated in
Table 1. Then turn the adjusting screw counter-
clockwise to the proper setting.
Tighten the splined nut and lower acorn nut after
the head/air setting has been adjusted.
Page 13
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