7. Choose the Nitrogen Oxide NOx requirement for the unit, None or <= 20 PPM.
Figure 4.3-2: Choose NOx Requirement
8. The main Combustion Calibration screen now appears. It provides two methods to ramp
the unit’s valve position up or down:
• Method 1: Toggle through the pre-set calibration points till you reach the desired
valve position, then press Go to go to that point (left image below).
• Method 2: Enable Fine VP Step, then manually press the + or – buttons once per
1% to bring the unit to the desired valve position (right image below).
PRESET CALIBRATION POINTS METHOD FINE VP STEP METHOD
Figure 4.3-3: Combustion Calibration Screens
9. Set the Controller’s Enable/Disable switch to Enable.
10. Change the valve position to 30%, press the Go button, then verify that the unit has ignited
and is operating as expected.
11. Use the (Right) arrow key to change the valve position to 100%, then press Go.
12. Verify that the gas pressure on the downstream side of the SSOV is within the required
range shown in Table 4.3-1. If it isn’t, remove the brass hex nut on the SSOV actuator to
access the gas pressure adjustment screw (Figure 4.3-4). Make adjustments using a flat-
tip screwdriver, slowly rotating the gas pressure adjustment (in 1/4-turn increments)
clockwise to increase gas pressure or counterclockwise to reduce it. The resulting gas
pressure reading on the downstream manometer should fall in the range listed below.
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