AERCO BMK 1.5 LN July 2011 - Manual (Page 48)

CHAPTER 4: INITIAL START-UP
Page 48 of 152 PR2: 05/09/12
Benchmark 1.5LN Low NOx Boiler
Operation and Maintenance Manual
OMM-0041_0D
GF-120
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
11. Increase the valve open position to 100% and verify that the gas pressure downstream
of the SSOV remains at 3” W.C. Readjust pressure if necessary.
12. With the valve position at 100%, insert the combustion analyzer probe into the flue probe
opening and allow enough time for the combustion analyzer to settle.
13. Compare the measured oxygen level to the oxygen range for the inlet air temperature
shown in Table 4-1. Also, ensure that the carbon monoxide (CO) and nitrogen oxide
(NOx) readings do not exceed the values shown.
Table 4-1: Combustion Oxygen Levels for a 100% Air/Fuel Valve Position
Inlet Air
Temp
Oxygen
%
± 0.2
Carbon
Monoxid
e
NOx
>100°F 4.8 % <100 ppm <30 ppm
90°F 5.0 % <100 ppm <30 ppm
80°F 5.2 % <100 ppm <30 ppm
<70°F 5.3 % <100 ppm <30 ppm
14. If necessary, adjust the iris air damper shown in Figure 4-5 until the oxygen level is
within the range specified in Table 4-1.
15. Once the oxygen level is within the specified range at 100%, lower the valve position to
80%.
USE 1/2"
WRENCH TO
INCREASE (CW)
OR DECREASE
(CCW) INLET AIR
IRIS
ADJUSTMENT
VIEW A - A
AIR INLET
IRIS AIR
DAMPER
FRONT
A A
AIR/FUEL
VALVE
Figure 4-5: Iris Air Damper Location/Adjustment