AERCO BMK 1.5 LN Dual Fuel Feb 2013 - Manual (Page 48)

CHAPTER 4: INITIAL START-UP
Page 48 of 162 PR2: 05/09/12
Benchmark 1.5LN Dual-Fuel Low NOx Boiler
Operation and Maintenance Manual
OMM-0041_0C
GF-121
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
Figure 4-4: Fuel Selector Switch Location (Front View w/Door Open)
9. Set the ON/OFF switch to the ON position.
10. Access the control panel Configuration Menu (Table 3-4) and ensure that the Max
Valve Position is set to 100%. (Refer to Chapter 3, para. 3.3 for instructions on
changing menu options).
11. Change the valve position to 29% using the ▲ arrow key. The unit should begin its
start sequence and fire.
12. Change the valve position to 29% using the ▲ arrow key. The unit should begin its
start sequence and fire.
13. Next, verify that the gas pressure downstream of the Natural Gas SSOV is 3” W.C.
for both FM and IRI gas trains. If gas pressure adjustment is required, refer to
Figure 4-5 and remove the brass hex nut on the SSOV actuator containing the gas
pressure regulator. (For IRI gas trains, the regulator is on the downstream SSOV).
Make gas regulator adjustments using a flat-tip screwdriver to obtain 3” W.C.
BRASS HEX
HEAD CAP
(REMOVE TO
ACCESS GAS
PRESSURE
ADJUSTMENT
SCREW)
SSOV ACTUATOR
Figure 4-5: Gas Pressure Adjustment Screw Location
14. Raise the valve position to 100% and verify that the gas pressure downstream of the
SSOV remains at 3” W.C. Readjust pressure if necessary.
15. 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.
16. 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 Monoxide 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