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Figure 13 – Retention Head/Throttle Cup Alignment
* note that for specifi c applications, the retention head may not contain 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 11) is securely against the stops in the
retention ring when the adjustment plate pointer is at "0"
(Figure 10).
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.
3.
Slightly loosen the upper acorn nut, the splined nut,
and the lower acorn nut.
4.
Turn the air adjustment screw clockwise to adjust
the plate with the pointer to the zero position.
5.
Referring to Figure 8, 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.
6.
Tighten the upper acorn nut securely.
7.
The rear door must be kept tightly closed. The
adjustment screw may now be turned to adjust the
head/air setting.
NX Burner Manual
Section: Perform Regular Maintenance
*
8.
Turn the adjusting screw to a setting that is
1/2 number lower than the proper set point as
indicated in Table 1. Then turn the adjusting screw
counterclockwise to the proper setting.
9.
Tighten the splined nut and lower acorn nut after
the head/air setting has been adjusted.
Blower Wheel Replacement
For installation or replacement of a blower wheel, insure
that there is a space between the blower wheel and the
motor face of 0.115". Refer to Figure 14.
Figure 14. – Blower wheel assembly
SK9670
21
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