AERCO KC Standard to Low NOx Convertion Instructions - Manual (Page 13)

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9. Next, remove the #8-32 screw securing the existing air butterfly to the Air/Fuel Valve shaft
(Figure 11) and remove the butterfly.
10. Apply a small amount of LocTite No. 222 (purple) to the #8-32 screw threads and install the
new air butterfly and flat washer provided in the Conversion Kit onto the shaft. Center the
butterfly so that there is equal clearance between the valve bore and the edges of the butterfly.
11. Manually open and close the butterfly several times to ensure that it is properly positioned on
the shaft with equal clearances around the valve bore
12. This completes the Air/Fuel Valve modifications. The modified Air/Fuel Valve is now ready to
be reinstalled using the procedures in Section 4.
Figure 11. Air Butterfly Replacement
3.2 Differential Gas Pressure Regulator Modification
The modification to be made to the Differential Gas Pressure Regulator consist of removing the exist
spring and replacing it with the new plated spring provided in the Conversion Kit. Proceed as follows:
1. Remove the cap on the Differential Gas Pressure Regulator (Figure 12).
2. Remove the adjustment screw and the installed regulator spring from the Differential Gas
Pressure Regulator.
3. Install the replacement plated spring provided in the Conversion Kit.