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Start the Burner and Set Combustion
c.
Turn the air adjustment screw counterclock-
wise to adjust the plate with the pointer to the
zero position.
d.
Slide the nozzle line assembly forward until
the retention head engages the fi xed stops in
the retention ring at the end of the air tube.
e.
Tighten the zero setting acorn nut.
f.
The rear door must be closed. The adjust-
ment screw may now be turned clockwise to
adjust the head/air setting.
Table 7a. – NX Burners
NX Air Tube & Head Combinations
LG - (9-slot head)
Head/Air
LH - (6-slot head)
Setting
0.5
0.40 – 0.50
1.0
0.45 – 0.60
2.0
0.55 – 0.70
3.0
0.65 – 0.80
4.0
0.75 – 0.90
5.0
0.85 – 1.00
NOTICE
The NX burner has a reduced diameter air tube, precision-designed air throttle cup and combustion
head for improved performance. This design provides very accurate control of the air/fuel ratio, but the light reaching
the cad cell through small holes in these components is limited. Because of this, the average cad cell resistance
may be higher than conventional burners with larger openings.
Table 7b. – NX Burner with Low Fire Rate Baffl e (LFRB) Installed
NX Air Tube & Head Combinations
LG - (9-slot head)
Head/Air
LH - (6-slot head)
Setting
0.5
–
1.0
0.40 – 0.55
2.0
0.50 – 0.65
3.0
0.60 – 0.75
4.0
0.70 – 0.85
5.0
0.80 – 0.95
NOTICE
Use factory-set or manufacturer's recommended Head/Air Setting for 'Starting the Burner and Set-
ting Combustion'. The Head/Air Settings shown in Tables 7 are provided for reference purposes and represent a
general range of rates and settings. Individual appliances, vent systems, and fi eld conditions will impact the overall
burner set up required for satisfactory combustion performance.
Page 16
LB - (9-slot head)
LD - (9-slot head)
LC - (6-slot head)
LF - (6-slot head)
--
1.10 – 1.25
--
1.20 – 1.35
0.85 – 1.05
1.30 – 1.45
0.95 – 1.15
1.40 – 1.55
1.05 – 1.25
1.50 – 1.65
1.15 – 1.35
1.60 – 1.75
LB - (9-slot head)
LD - (9-slot head)
LC - (6-slot head)
LF - (6-slot head)
0.40 – 0.60
0.50 – 0.70
0.60 – 0.80
0.70 – 0.90
0.80 – 1.00
0.90 – 1.10
g.
Turn the adjusting screw to a setting 1/2
number lower than the proper setpoint as
indicated in Tables 7a and 7b. Then turn
the adjusting screw counterclockwise to the
proper setting.
h.
Tighten the spline nut after the head/air set-
ting has been adjusted.
–
1.10 – 1.25
1.20 – 1.35
1.30 – 1.45
1.40 – 1.55
–
RWB 6104 BNX
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