AERCO BMK 1.5 LN July 2011 - Manual (Page 51)

CHAPTER 4: INITIAL START-UP
PR2: 05/09/12 Page 51 of 152
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
45. Press the ▼ arrow key until CAL Voltage 30% is displayed.
46. Press the CHANGE key. CAL Voltage 30% will begin to flash.
47. The oxygen level at the 30% valve position should be as shown below. Also, ensure that
the carbon monoxide (CO) and nitrogen oxide (NOx) readings do not exceed the values
shown.
Table 4-5: Combustion Oxygen Levels for a 30% Air/Fuel Valve Position
Oxygen
%
± 0.2
Carbon
Monoxide NOx
7.0 % <50 ppm <30 ppm
48. If the oxygen level is not within the specified range, adjust the level using the ▲ and ▼
arrow keys. This will adjust the output voltage to the blower motor as indicated on the
display. Pressing the ▲ arrow key increases the oxygen level and pressing the ▼ arrow
key decreases the oxygen level.
49. Once the oxygen level is within the specified range at 30%, press the ENTER key to
store the selected blower output voltage for the 30% valve position.
50. Press the ▲ arrow key until SET Valve Position appears on the C-MORE display.
51. Press the CHANGE key. SET Valve Position will begin to flash.
52. Press the ▼ arrow key until the SET Valve Position reads 16%, then press the ENTER
key.
53. Press the ▼ arrow key until CAL Voltage 16% is displayed.
54. Press the CHANGE key. CAL Voltage 16% will begin to flash.
55. The oxygen level at the 16% valve position should be as shown below. 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 16% Air/Fuel Valve Position
Oxygen
%
± 0.2
Carbon
Monoxide NOx
8.0 % <50 ppm <30 ppm
56. If the oxygen level is not within the specified range, adjust the level using the ▲ and ▼
arrow keys. This will adjust the output voltage to the blower motor as indicated on the
display. Pressing the ▲ arrow key increases the oxygen level and pressing the ▼ arrow
key decreases the oxygen level.
57. Once the oxygen level is within the specified range at 16%, press the ENTER key to
store the selected blower output voltage for the 16% valve position.
58. This completes the natural gas combustion calibration procedure.
4.5 UNIT REASSEMBLY
Once the combustion calibration adjustments are properly set, the unit can be reassembled for
service operation.
1. Set the ON/OFF switch in the OFF position.