Watts AERCO Edge CFR 3000 Operator's And Service Manual page 19

SECTION 4 INITIAL START-UP
Figure 4-5: Manual Combustion Calibration Screens
12. Set the Controller's Enable/Disable switch to Enable.
13. Change the valve position to 30%, press Go, then verify the unit has ignited.
14. Use the  (Right) arrow key to change the valve position to 100%, then press Go.
15. Verify that the manifold gas pressure on the downstream side of the SSOV is within the range
shown in Table 4-1. If it isn't, remove the brass hex nut on the SSOV actuator to access the gas
pressure adjustment screw (Figure 4-3). 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.
TABLE 4-1: REFERENCE Natural Gas Manifold Gas Pressure Range @ 100% Fire Rate
Model
CFR 3000
16. With the valve position still at 100%, insert the combustion analyzer probe into the exhaust
manifold probe opening (see Figure 4-2a – 4-2c in Section 4.2.3) and allow enough time for the
combustion analyzer reading to stabilize.
17. Using a combustion analyzer, compare the O
match, adjust the Blower Voltage until the O
or – controls, or press on the field and type the value directly.
18. If adjusting blower voltage is not sufficient to get the O
column, repeat Step 15 to adjust gas pressure up or down within the range shown in the table, then
repeat Step 18. Continue repeating steps until the gas pressure is within the range in Table 4-1 and
the O Reading column matches the Target column.
2
19. Enter the downstream manometer's gas pressure reading in the Downstream Gas Pressure field.
Note, this field appears only when Valve Position % = 100%.
20. Compare the measured nitrogen oxide (NOx) and carbon monoxide (CO) readings to the Target
values in Table 4-2 (shown as a reference only). If you are not in a "NOx-limited" area and/or do not
have a NOx measurement in your analyzer, set the O
TABLE 4-2: NATURAL GAS Calibration Target Values @ 100% Valve Position
Model
CFR 3000
•
Manifold Gas Pressure Range @ 100% Fire
2.3 ± 0.2" W.C. (0.57 ± 0.05 kPa)
value in the Target and Reading columns. If they don't
2
value in both columns matches, and use either the +
2
O %
2
5.0% ± 0.2%
•
Reading column to match the Target
2
to the value in the Standard NOx column.
2
NOx CO
≤20 ppm <100 ppm
•