AERCO KC Standard to Low NOx Convertion Instructions - Manual (Page 42)

42
NOTE
At 25% (2.0V) firing rate, adjust only the differential pressure regulator. At
100% (5.0V) firing rate, adjust only the inlet air shutter.
19. If the measured oxygen reading is above the oxygen range in Table 6, loosen the two 7/16"
locking nuts securing the inlet air shutter. Close the air shutter 1/4” to 1/2” to decrease the
oxygen level and tighten the two nuts.
20. Allow the analyzer to settle then compare the new oxygen reading to Table 6.
21. Repeat the adjustment until the oxygen is within the specified range. Also, ensure that the CO
and NOx readings do not exceed the values shown. Firmly tighten the inlet air shutter locking
nuts when finished.
NOTE
Adjust the inlet air shutter only at 100% (5.0V) firing rate. Do not adjust the
differential pressure regulator.
22. Change the firing rate to 25% (2.0V). Allow time for the combustion analyzer to settle. Check
the measured oxygen level, CO and NOx emissions to ensure that they are still within the
ranges shown in Table 4.
23. Continue these procedures until all oxygen levels are within the ranges specified in Tables 4, 5
and 6.
24. Record all readings on the AERCO start-up sheet provided with each unit. Proceed to
paragraph 4.4 when all natural gas combustion calibration procedures are completed.
5.5 Unit Reassembly Following Combustion Calibration
Once combustion calibration is set properly, the unit can be reassembled for permanent operation.
1. Set the ON/OFF switch to the OFF position. Disconnect AC power from the unit.
2. Shut off the gas supply to the unit.
3. Remove any regulator adjustment tools by first pulling up the screwdriver blade to disengage it
from the regulator adjusting screw, and then turning the tool out of the top of the regulator.
4. Apply a drop of silicone adhesive to the regulator adjusting screw to lock its setting.
Remove the gasket from the tool and place it back onto the regulator cap.
5. Reinstall the cap and gasket back on the regulator. Tighten the cap using a screwdriver or
wrench.
6. Remove all of the manometers and barbed fittings and reinstall the pipe plugs using a suitable
thread compound.
7. Remove the combustion analyzer probe from the vent hole. Seal the probe hole and replace
the vent connection cover.
8. Replace the unit’s panels and hood.
The KC1000 is now ready for Low NOx operation.